The Electronic Load

Issue 03/2013 

The Electronic Load

From first contact to support for your technical application, 

we are by your side with friendly, 

fast and competent support.

Contents 

H&H 

Location Page 4 

Quality, environment, working and social standards Page 5 

Research, H&H on the Internet, H&H worldwide Page 6,7 

DC Loads 

Single channel 

PL series 500 W ... 1,500 W Page 8 

ZS series 500 W ... 28,800 W Page 12 

ZSLC series 8,000 W ... 40,000 W water-cooled Page 26 

ZSLV series 1,000 W ... 6,000 W for low input voltage Page 29 

Multichannel 

PMLI series Page 34 

AC Loads 

Single phase and three-phase current 

ZSAC series 400 W ... 21,000 W Page 38 

Source-Sinks 

Unipolar and bipolar 

NL series Page 46 

Accessories 

Cables Page 55 

19“ racks , Mains switch Page 57 

H&H Application Notes 

AN #1 Source-sink with power supply and H&H ZS electronic load Page 58 

AN #2 Loading of small voltages with the help of an external power supply Page 59 

AN #3 Simulation of exponential inrush currents Page 60 

AN #4 Superposition of AC Page 61 

AN #5 Characteristic recording of solar panels Page 62 

AN #6 Loading AC voltages with a DC load Page 63 

AN #7 Avoiding inrush current peaks and minimizing the dead time at voltage connection Page 64 

AN #8 Non-linear AC current loads with ZSAC series Page 65 

AN #9 Battery simulation with electronic load and power supply Page 68 

AN #10 MPP tracking with ZS series electronic loads Page 69 

Software 

BEL-Test Battery test program Page 72 

General terms and conditions of business Page 74 

Application Notes ZS PL H&H 

ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC

The Electronic Load 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Development, 

production 

and support: 

Made in Germany 

H&H and its Location 

Höcherl & Hackl GmbH was up by comprehensive support. 

founded in 1986 as a 

H&H loads are designed with 

partnership and in 1990 it was 

particular focus on durability and 

transformed into the current 

reliability. 

GmbH. 

A qualified and highly motivated 

Since then H&H has developed 

team ensures the constant 

and is now established as the 

development and refinement of 

leading supplier of electronic 

products and optimum quality. 

loads. 

The strengths of the company lie 

The entire product development 

not only in its wide range of 

and production process takes 

standard products but in its offer 

place in our 850 m² production 

of tailored variants to customer 

facility in Konzell, Bavaria. 

specifications. 

The process starts with 

The H&H company philosophy is to 

mechanical design and the 

involve local suppliers to 

development of hardware and 

strengthen the region and 

software leading to complete 

ultimately Germany as a location 

manufacture and commissioning. 

It is completed with 

for industry. 

quality assurance and followed "Made in Germany" therefore has 

a particular resonance at H&H. 

We are particularly proud of our 

fast, friendly and comprehensive 

customer support. 

H&H provides the kind of support 

our own employees would expect 

from other companies. 

As a manufacturer we have 

detailed technical knowledge of 

our products and can address 

customer applications with speed 

and expertise. 

GTC 

Software 

4


H&H and Quality 

A customer and market 

orientated quality strategy is a 

permanent element of the H&H 

company policy. 

We have implemented a DIN EN 

ISO 9001 quality management 

system therefore since 1999. 

The processes described therein 

are intended to prevent errors in 

all phases of production from 

development to product 

application. 

The quality management 

H&H is engaged in maintaining 

high working and social 

standards. 

The protection of human rights 

and the upholding of laws and 

standards is the primary 

element of our company policy. 

Required working and social 

standards are documented at 

H&H. 

manual describes the 

specifications and processes 

needed to ensure quality 

requirements. 

It is available for all our 

customers to view. 

In order to meet our defined 

quality requirements, checks 

are planned and 

implemented in all phases 

of production from goods 

incoming through 

manufacture to final 

inspection. 

H&H and the Environment 

Our environmental protection is 

our own initiative and we have 

defined our environmental 

guidelines in an environmental 

declaration. H&H pursues its 

own environmental management 

system, which is 

continuously improved and 

expanded upon. 

The H&H environmental 

management system is 

implemented as a part of ISO 

9001 and is monitored and 

audited within this context. 

Processing instructions and 

related work instructions inform 

all of our environmentally 

relevant processes. 

All H&H employees are involved 

in the process and participate in 

regular training. 

H&H products are RoHS 

compliant. 

RoHS 

compliant 

The following areas of 

the company are 

integrated into the environmental 

management system: 

Material management 

Goods incoming and 

outgoing 

Manufacture 

Development 

Waste management 

Energy management 

H&H and Working and Social Standards 

They are based on human rights 

and the ILO core working 

standards. 

Employees participate in regular 

training on the contents of the 

working and social standards. 

H&H has been 

certified according 

to ISO 9001 

continuously 

since 1999 

Considering the 

environment 

means considering 

our children 

Maintaining 

working and social 

standards is an 

ethical issue 

GTC 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

5



ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

H&H and Research 

H&H actively supports innovative 

developments in the 

fields of alternative energies and 

electro-mobility. 

We provide equipment for 

research and training centers in 

order to realise innovative 

projects. 

Trainees thus learn how to work 

with the latest technologies. 

Delta Lloyd Solar 

Boatstream 

OSCAR 

Open Source Car 

AKASOL e.V. 

University of Delft 

Fuel cell research 

University of RheinMain 

GTC 

Software 

6


H&H Service is 

available in more 

than 25 countries 

Find the latest information on 

our website at 

www.hoecherl-hackl.com 

Take a look at the devices we 

supply, download current drivers 

and tools and check for new 

firmware for your devices. 

Handbooks (Manuals) are also 

available to download. 

H&H Worldwide 

H&H sales partners can be found 

in the following countries: 

 

 

 

 

 

 

 

 

Austria 

Belgium 

Brazil 

China 

Czech Republic 

Denmark 

France 

Germany 

 

 

 

 

 

 

 

 

 

 

Hungary 

India 

Ireland 

Italy 

Liechtenstein 

Malaysia 

Netherlands 

Philippines 

Portugal 

Singapore 

H&H by Mouseclick 

 

 

 

 

 

 

 

 

 

 

Slovakia 

Slovenia 

South Korea 

Spain 

Sweden 

Switzerland 

Thailand 

Turkey 

United Kingdom 

Vietnam 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

GTC 

Software 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

7


Electronic Loads, PL Series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

Interface overview 

RS-232 

O 

USB / 

GPIB 

O 

LAN 

O 

System bus 

O 

Analog 

X 

Analog isolated / 

X Standard O Option / not available 

Model 

Continuous Shorttime Voltage Current Rise and fall Resistance 3) Housing Connections 4) 

(order number) 

PL506 

power 

500 W 

power 1) 

900 W 60 V 50 A 

time 2) 

75 µs 0.1 Ω ... ∞ ½19”, 2HU FK 8 

PL506 SC5 5) 300 W 300 W 60 V 5 A 75 µs 

1 Ω ... ∞ ½19”, 2 HU PK 4 

PL512 500 W 900 W 120 V 20 A 75 µs 0.2 Ω ... ∞ ½19”, 2 HU PK 4 

PL524 500 W 900 W 240 V 10 A 75 µs 0.5 Ω ... ∞ ½19” ,2 HU SB 4 

PL540 500 W 600 W 400 V 8 A 75 µs 1.5 Ω ... ∞ ½19”, 2 HU SB 4 

PL1006 1000 W 1800 W 60 V 100 A 75 µs 0.05 Ω ... ∞ 19”, 2 HU FK 8 

PL1006 SC10 5) 600 W 600 W 60 V 10 A 75 µs 0.5 Ω ... ∞ 19”, 2 HU PK 4 


PL1024 1000 W 1800 W 240 V 20 A 75 µs 0.3 Ω ... ∞ 19”, 2 HU SB 4 

PL1040 1000 W 1200 W 400 V 16 A 75 µs 

1 Ω ... ∞ 19”, 2 HU SB 4 


PL1506 SC15 5) 900 W 900 W 60 V 15A 75 µs 0.4 Ω ... ∞ 19”, 2 HU PK 4 




1) The possible short time power depends on 

the temperature of the output stage, i.e. on 

the previous load. 

Operating Modes 

The devices have constantcurrent 

and constant-resistance 

operating modes in both 

static and dynamic operation. 

If fitted with an RS-232 or 

GPIB interface, softwarecontrolled 

constant power 

control is possible. 

The manual setting of the load 

values takes place via two 

precise ten-turn potentiometers. 

Switch from value A to 

value B by a keystroke. 

PL1006 

2) Rise and fall times are defined from 

10 ... 90 % and 90 ... 10 % of the 

maximum current. (Constant current 

operation, tolerance +/- 20 %). 

Dynamic Operation 

In dynamic mode the inbuilt 

modulator performs the switch 

between the setpoints A and 

B. For each load level it is 

possible to set a corresponding 

pulse duration of 0.5 ms ... 

500 milliseconds. In addition, 

pulse-pause ratios can be 

varied within broad time 

range. 

Switching between the two 

load levels can also be via the 

analogue I/O interface at all 

levels between 3 V and 30 V. 

PL506 

3) ∞ is achieved in the context of 

reproducibility for resistance operation. 

4) SB 4: Protected laboratory socket 4 mm 

PK 4: Pole terminal for 4 mm laboratory 

Protective Devices 

Over-current protection 

Over-power protection 

Over-temperature 

protection 

Over-voltage protection 

Reverse polarity 

protection 

Protection of the GND 

lines at the Analog I/O 

interface 

If a protected value is 

exceeded the respective 

display flashes. 

jack 

FK 8: Flat copper rail with M8 screw 

5) Devices with reduced setting range 

1HU = 1 height unit = 44.45 mm 

Overload Capacity 

The type spectrum comprises 

three power classes with 

500 W, 1000 W and 1500 W 

continuous load capacity. 

Depending on the model the 

devices have temporary 

overload capacity. The level and 

duration of the possible 

overload depends on the 

operating temperature of the 

power stage. 

The device can also be used for 

significantly higher 

power tasks. 

GTC 

8


RS-232 Interface 

(Option PL01) 

The RS-232 interface is the 

most economical option for 

controlling devices by PC. It also 

includes the system bus 

interface which allows multichannel 

systems to be 

constructed. 

GPIB + RS-232 interfaces 

(Option PL02) 

Combined GPIB + RS-232 

interface + system bus interface 

External LAN-RS232 Adapter 

(Option PL04) 

Enabled the device to be 

controlled via LAN interface. 

Analog I/O Interface 

Standard Analog I/O Interface 

with 0 ... 10V level for: 

Input voltage 

Load current 

Power consumption 

Nominal current 

Master-Slave circuit 

The control of the load current 

can be via an analog signal with 

optionally 0 ... 5 V or 0 ... 10 V. 

Requires PL01 or PL02. 

Software Tools 

The H&H Homepage has a 

program library for Windows 

with the following applications: 

Load control via PC 

Programming of custom 

load profiles 

Recording of current 

limitation characteristics 

Endurance test with 

memory function for voltage 

and current 

Battery testing with 

recording of discharge 

curves 

LabVIEW driver 

The Analog I/O Interface also 

has the following logical 

inputs and outputs: 

“Overload“ status for the 

overload display 

Trigger output during 

dynamic operation 

Trigger input for external 

control of the dynamic load 

change 

Control input for battery test 

Control Input for external 

load activation 

Sense terminals (for 60V 

and 120 V models) 

Factory Calibration 

Certificate 

(Option FCC-PLxx) 

A Factory Calibration Certificate 

(FCC) can be supplied with the 

devices. The FCC meets the 

requirements according to DIN 

EN ISO 9000ff. 

This calibration certificate 

documents the traceability to 

national standards to illustrate 

the physical device in 

accordance with the international 

System of Units (SI). 

The recommended calibration 

interval is 1 year. 

GTC 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Interfaces 

Optional interfaces are an RS- 

232 and a combined GPIB + RS- 

232 interface. 

The interfaces enable all 

settings functions including 

comprehensive dynamic settings 

incl. programmable rise and fall 

times. 

There is also a measurement 

function for input voltage and 

load current. All interfaces are 

electrically isolated from the 

load input to prevent earth 

loops forming with the test 

structures. Programming takes 

place in SCPI syntax. 

Configuration of a 

Multichannel System 

For control of additional devices 

via the GPIB or RS-232 interface 

of the primary device, any 

number of devices can be 

connected via the system bus 

interface (Option PL01 in all 

other devices). Despite the 

shared interface, the devices are 

electrically isolated from one 

another and can be operated 

with potential differences of up 

to 125 V. 

Accessories 

Software 

9



ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

Technical Data PL Series 

Accuracy of manual setting, no preset function 

of the setting value 

of the corresponding range 

Current ±0.4 % ±0.05 % 

Resistance 

(at 5% to 100% of the 

±5 % ±0.5 % of current range 

voltage range) 

Accuracy of manual setting, with preset function 

of the preset value of the corresponding range 

Current 

±0.6 % ±0.05 % 

Accuracy of display 

of the measured 

value (actual value) 


Voltage ±0.2 % ±0.05 % ±1 digit 

Current ±0.4 % ±0.05 % ±1 digit 

Accuracy of analog control 

0 ... 5 V / 0 ... 10 V for current setting 

of the setting value of the corresponding range 

Current 

10 V 

5 V 

±0.5 % 

±1.5 % 

±0.2 % 

±0.4 % 

Input resistance of analog inputs 10 kΩ/20 kΩ at 5 V/10 V 

GND max. ±2 V with respect to negative load input 

Accuracy of analog measurement outputs 

0 ... 10 V for current, voltage, power 

of analog signal of 

actual value 

offset voltage 

Voltage ±0.2 % ±20 mV 

Current ±0.3 % ±20 mV 

Power ±5 % ±30 mV 

Reference voltage 

10.5 V 

±4 % 

Load capacity: minimal 2 kΩ 

Input 

Input resistance 

Input capacity 

Parallel operation 

Input voltage 

Minimum voltage 

Permissible 

operating voltage 

Protective devices 

Connections: 

Load input: 

Sense: 

Continuous power 

>50 kΩ when load input is off 

Approx. 2 µF / 500 W 

Up to 5 units in Master-Slave mode 

(hardware-controlled) 

See type overview 

Min. 1.4 V for max. current including linear derating 

of current with respect to 0 V 

Negative load input - housing 

125 V DC 

Over-voltage up to 120 % of rated voltage, 

over-current, over-power, over-temperature, 

reverse polarity up to rated current, 

transient protection, 

display by flashing of current and/or voltage display, 

under-voltage display (if input voltage is too low for 

the set load) 


up to 120 V: available on I/O interface 

from 240 V: unavailable 

See type overview (where TA = 21 °C) 

Derating -1.2 % / °C for TA > 21 °C 

Overload capacity 


Accuracy of setting 

Programming via data interface (Option PL01 or PL02) 


Current ±0.4 % ±0.05 % 

Resistance 

(at 5 % to 100 % of the 


voltage range) 

Resolution setting 12 Bit 

Accuracy of measurement, read out via data interface 




Voltage ±0.2 % ±0.06 % 

Current ±0.5 % ±0.12 % 

Resolution 

13 bit 

Sampling rate 300 ms, non-triggering 

Control via Analog I/O interface 

Status outputs (open Overload 

collector 30 V) 

Trigger output at dynamic load 

External control 

functions 

(Level 3 V ... 30 V) 

Dynamics 

Time range for 

internal modulator 

Accuracy of the time 

setting 

Battery test 

Adjustable cut-off 

voltage 

Presetting function 

Current mode 

Resistance mode 

Operating conditions 

Operating 

temperature 

Cooling 

Load switching off - on 

Battery test off - on 

Trigger input for switching dynamic load level 

two load levels in I and R mode, 

two separately adjustable times 

External triggering of load level switching also 

possible 

1 ms ... 500 ms (2 Hz ... 1 kHz) 

±10 % ± 0.2 ms 

the load is reduced to 0 on reaching the cut-off 

voltage (I/V mode, R/V mode) 

Direct display of load current 

Display of expected load current with applied input 

voltage 

5 °C ... 40 °C 

2-stage air-cooling 

Noise PL5XX PL10XX PL15XX 

55 dBA 59 dBA 60 dBA 

Supply voltage 

Power 

consumption 

Dimensions 

W x B x D (mm) 

weight 

Colour 

Front panel, back panel 

side panels, top 

115/230 V~ ±10 %, switchable 50 ... 60 Hz 

PL5XX PL10XX PL15XX 

max. 30 VA max. 50 VA max. 60 VA 

PL5XX PL10XX PL15XX 

222 x 88 x 390 444 x 88 x 390 444 x 88 x 390 

6 kg 12 kg 16 kg 

RAL7032 (pebble grey) 

RAL7037 (stone grey) 

Electrical safety DIN EN 61010: 2002-08 

EMC, CE marking DIN EN 61326-1: 2006-10 

DIN EN 61000-3-2: 2006-10 

DIN EN 61000-3-3: 2006-06 

19” mounting kits for models order number 

1 PL5XX ES PL05-1 

2 PL5XX ES PL05-2 

PL10XX or PL15XX ES PL2 

Warranty 

2 years 

Subject to technical modifications 

10

It all started with ... 

Manufacturing department 1986 

Manufacturing department 1986 

Johann Hackl commissioning a unit


Electronic Loads, ZS Series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 


RS-232 

O 

USB 

O 

GPIB 

O 

LAN 

O 

System bus 

O 

Analog 

X 

Analog isolated 

O 


Voltage up to 800 V 

Currents up to 2,250 A 

Power 500 W ... 28.8 kW 

Depending on model, temporary overload capacity 

Current, voltage, resistance, power mode 

Dynamic loads 

SCPI programming with measurement function 


The electronic loads of the ZS 

have the four operating modes 

constant current, voltage, 

power and resistance. In 

addition, depending on the 

operating mode limit values can 

be set for the maximum 

permissible current and the 

minimum permissible voltage. 

To increase the resolution for 

each device, along with the full 

setting range, a reduced setting 

of 1 / 3 of the rated current is 

available. The load can be 

preset even without a 

connected test unit. The display 

then shows the values directly 

in amps, ohms, volts or watts. 

ZS4812 

Dynamic and Control Time 

The inbuilt modular enables two 

independently-adjustable 

currents and times from 

100 μs ... 1 s. The control speed 

of the devices can be adjusted 

to the test unit in three stages 

(fast - medium - slow). 

Protective Devices 

The following protective devices 

are built in: 

Over-current protection 

Over-power protection 

Over-temperature 

protection 

Over-voltage protection 

Reverse polarity protection 

Protection of the GND lines 

on the Analog I/O 

interface 

Full electronic protection 

Analog measurement outputs for voltage and current 

Analog control input 

MPP tracking 

Dynamic function with synchronized data logging 

Voltage Switching 

A trigger voltage can be set for 

peak-free voltage hook-up. The 

current is enabled when the 

input voltage exceeds the 

trigger voltage. 

Overload Capacity 

Depending on the model the 

devices have temporary 

overload capacity. The 

level and duration of the 

possible overload depends on 

the operating temperature of 

the output stage. 

The device can also be used for 

significantly higher performance 

tasks. 

Remote Control 

All the load functions can be 

controlled remotely via Analog 

I/O Interface. The control inputs 

can be operated with TTL levels 

and 24 V from PLC controllers. 

A version (ZS06) which is 


load input is optionally 

available . 

12


ZS4812 

Analog Control 

In the operating modes CC, CV 

and CP the set value can be 

preset to 0...5 V or 0...10 V DC. 

Analog Measurement 

Outputs 

There are 0...10 V analog 

measurement signals available 

for voltage, current and power. 

The GND terminals can float ±2 

V with respect to the negative 

load input (also optionally 

isolated - Option ZS06). 

Cooling 

The units are air-cooled. To 

keep the operating noise low, 

the fans are temperature and 

current-dependently controlled. 

For better utilization of the 

maximum possible overload 

capacity the fans can be set to 

full power. 

Mechanics 

The ZS is a sturdy 19“ rack 

design and can also be used as 

a table-top device. 

From 5 height units there are 

retractable handles on the top 

of the device. 

Optional castors can be 

mounted on heavy devices. 

Separate installation kits are not 

needed for 19“ rack installation. 

Connections 

All connections are at the back. 

The current connections are 

solid copper rails with screw 

connectors. 

Safety 

Covers are available as contact 

protection for units for 

dangerous contact voltages. 


GTC 

ZSLC 

Water-cooled 

Software 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

13


Data Interfaces (Accessories) 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

Extended Function Range 

When Using an Optional Data 

Interface 

Programming in SCPI-Syntax 

Settings with 16 Bit resolution 

Measurement function for 

voltage, current and power 

Programmable load profile 

Dynamic operation with 

variable current rise and fall 

speed 

Measurement data memory 

Trigger functions 

Use of supplied software tools 

and LabVIEW ® driver 

RS-232 + USB Interface 

(Option ZS01) 2) 

Option ZS01 adds a RS-232 and 

USB interface (as virtual COM 

Port) to the device. 

Programming is in SCPI. 

(Including 2m RS-232 cable) 

The interface cards are 

removable and can be 

exchanged or expanded as 

required. 

The devices can be fitted with 

the following interfaces: 

GPIB + RS-232 + USB 

Interface 


The GPIB interface also 

includes the RS-232 + USB 

interface (Option ZS01). 

(Including 2m RS-232 cable, no 

GPIB cable.) 

To Create Multi-Channel Systems 

1) Can be retrofitted at any time 

2) Can only be retrofitted or produced by 

H&H. 

3) Requires ZS01 or ZS02 

Order example for 3 loads: 

Master with RS-232, 

connection via cable: 

Load 1+ZS01+ZS04-M, 

Load 2+ZS04-S, 

Load 3+ZS04-S 

Settings 

Measurement 

function 

Loadprofile 

generator 

Resolution 

Accuracy 

Resolution 

Sampling rate 

Accuracy 

Current: 

Voltage: 

Meas. data memory: 

Steps: 

Pulse duration: 

Ramp time: 

Repetition rate: 

GPIB Interface Expansion 

1) 3) 

(Option ZS03) 

If there is an existing 

RS-232 interface (Option 

ZS01), option ZS03 can be 

upgraded to the GPIB interface. 

Simply insert the card. 

(Supplied without GPIB cable.) 

System Interface Cable 

(Option ZS04-M, ZS04-S) 

(-M for master unit 3) , 

-S for slave unit) 

To build multi-channel systems, 

additional loads can be 

connected to the master device 

via the system interface. For 

this, the master unit is fitted 

with the system interface 

ZS04-M1 3) and the slave units 

with ZS04-S 2) . 

All units can then be 

programmed via the master 

interface. Connection is via the 

standard LAN cable. The load 

inputs remain electronically 

isolated. (Including 1 m cable.) 

Data logging with 

constant scanning 

rate 

16 bits 

see Technical Data 

18 bits 

approx. 300 ms for V+I, not 

synchronized 

±0.2 % of MV ±0.05 % of range 

±0.1 % of MV ±0.05 % of range 

max. 2000 V/I-values + time 

max. 50 

200 µs … 2000 s 

0 … 2000 s 

once, n times, continuous 

Ethernet-RS-232 Converter 

1) 3) 

(Option ZS15) 

Data is sent via the LAN card to 

the serial interface of the unit. 

Option ZS01 is needed for this. 

If option ZS01 is already 

available the device can be 

easily upgraded with the ZS15 

option. 

Fiber Optic System Interface 

(Option ZS05-M, ZS05-S) 

(-M for master unit 3) , 

-S for slave unit) 

For greater distances (> 3 m) 

and more than three connected 

devices a fiber optic system 

interface is recommended. 

Simply replace the cable version 

option ZS04 with the fiber optic 

version ZS05. 

The fiber optic connection is also 

recommended for higher EMC 

load. 

(Including 5 m optical cable.) 

14


Data Acquisition Tool (Option) 

Data Acquisition Tool 

1) 2) 

(Option ZS13-15) 

The Data Acquisition Tool 

expands the range of the device 

by the following functions: 

Fast synchronized data 

logging for waveform 

generation with data 

memory 

Exponential inrush currents 

Battery capacity test 

MPP tracking for solar panel 

test 

Solar Panel Test 

The unit automatically 

searches for the Maximum 

Power Point in solar panels 

and self-adjusts as the sun's 

radiation changes. 

Measures Ah and Wh. 

Simultaneous recording of 

voltage and current is 

possible. 

Exponential 

Processes 

Starting 

When the input voltage is 

switched on the unit 

generates an exponentially 

falling wave trajectory with 

adjustable time constant. 

Peak current, time constant 

Converter 

(in addition to 18 Bit 

standard A/D converter) 

Sampling rate 

Synchronization 

Measurement data memory 

Synchronized data logging 

with variable scanning rate 

for waveform. Simultaneous 

measurement of voltage and 

current. 

fast 15 Bit A/D converter 

Simultaneous measurement of voltage and current 

min 200 μs, can be programmed separately for each 

wave section and synchronized with waveform generator 

2000 V/I value pairs with timestamp 

Battery Capacity Test 

The device discharges a 

battery in any operating 

mode down to the preset cutoff 

voltage. When the cut-off 

voltage is reached the 

current is switched off. 

Measures Ah and Wh. 

The measurement function 

can be started simultaneously 

in order to record the 

discharge curve. 

Supplied Drivers 

You can find the latest 

LabVIEW ® driver at: 

www.hoecherl-hackl.com/ 

or 

www.ni.com/downloads/ 

instrument-drivers/d/ 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

(min. 2 ms) and continuous 

current are programmable. 


H&H. 

Software 


GTC 

15


Hardware Expansions 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Electrically Isolated Analog 

Interface 1) (Option ZS06) 

In the case of potential 

differences between the negative 

load input and the signals 

on the Analog I/O Interface the 

standard Analog I/O card can be 

replaced with an isolated 

version. All measurement and 

control signals are transmitted 

via isolation amplifiers and optocouplers. 

The card is pincompatible 

with the standard 

Analog I/O card. The isolation 

voltage is 500 V DC with respect 

to the negative load input. 

Castors 1) 

(Option ZS09) 

Steerable castors can be 

screwed onto large devices for 

easier transport. A 19“ rack can 

then often be dispensed with. 

This option is available for 

devices from 5HU and is 

suitable only for hard floors. 

Calibration 


Certificate 

(Option FCC-ZSxx) 5) 



devices. 

The FCC meets the requirements 

according to DIN EN ISO 9000ff. 

1) 3) 

Power I/O Card 

(Option ZS07) 

The Power I/O card can be 

expanded to control external 

devices. 8 relay contacts (N/O 

125 V/1 A) can be actuated via 

the data interface and 8 logical 

inputs (5V ... 24V, shared GND) 

can be queried. The inputs and 

outputs are isolated from the 

load input. The isolation voltage 

is 500 V DC with respect to the 

negative load input. 

Zero-Volt Option 2) 

(Option ZS12) 

The zero-volt option expands 

the operating range of the 

electronic load up to the short 

circuit (approx. 10 mV). It can 

also compensate for voltage 

drops on power leads up to 

0.5 V. 

The zero-volt option is ideal for 

testing fuel cells in conjunction 

with adjusted measuring 

ranges. The available zero-volt 

options are listed in the 

technical overview. 

The load capacity drops by 

approx. 3 V × the set current. 


the physical unit in accordance 

with the international device 

system (SI). 


interval is 1 year. We would be 

happy to calibrate your devices 

at regular intervals. 

Analog I/O Extension Card 1) 

(Option ZS08) 

The Analog I/O Extension card 

provides additional control 

inputs for analog presetting of 

trigger voltage and the current 

limiter. The card also has three 

relay outputs which are 

activated in the event of "Input 

on", reaching "Trigger voltage" 

or "Overload". The signals are 


load input via the isolation 

amplifier. The isolation voltage 

is 500 V DC with respect to the 

negative load input. 

Reverse polarity protection and 

mains voltage switching is not 

available if you install a zerovolt 

option. The fans of the 

zero-volt option generate a 

continuous operating sound. 

A zero-volt option is available 

up to 150 A. 

1) 3) 4) 

Temperature Interface 

(Option ZS16) 

With the temperature interface 

card temperatures from 0...100 

°C are captured by a NiCr-Ni 

(Type K) sensor and transformed 

into a 0...10 VDC analog 

voltage. 

This analog voltage can be fed 

to the analog control input of 

the Analog I/O Interface and 

read out via the data interface. 


Software 

GTC 


1) Can be retrofitted at any time. 


H&H. 


4) Requires option ZS13 

5) Can only be produced by H&H. 

(The FCC is more economical if ordered 

together with a new device) 

16



The following SW tools and 

drivers are delivered as 

standard with the interfaces: 

Load Control 

Individual devices and multichannel 

systems can be 

controlled via the tool. 

The range of functions includes 

PC device set-up with the option 

to save, data logging with 

graphical display and saving 

data for other programs. 

Waveform Editor 

Data Acquisition 

As well as device control, 

measured data can be logged 

and saved. 

The following measured values 

can be selected: Current - 

Voltage - Time. 


The Waveform Editor permits 

the intelligent generation of load 

profiles in the form of straight 

sections. The load waveform is 

displayed on entry. The profiles 

can be saved. 

Basic Communication Tool 

The Basic Communication Tool 

can be used to send any 

commands for test purposes 

and for commissioning of test 

systems. 

MPP Tracking 

Solar panels can be tested in 

combination with Option ZS13. 

Voltage, current and power are 

displayed numerically. 

Measurement Data Analysis 

Battery Test 

All standard battery types can 

be discharged with the battery 

tool. The discharge curves are 

recorded and displayed. Ah and 

Wh are also logged. 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

Accessories 

Characteristics Recorder 

Battery Test 

GTC 

NL 

Source-Sink 

Software 

17


500 W ... 800 W DC 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

Model 


ZS506-4 ZS506 ZS512-4 ZS530-3 ZS560-3 ZS580-3 

4 ranges 1 range 4 ranges 3 ranges 3 ranges 3 ranges 

Voltage 60 V 60 V 120 V 300 V 600 V 800 V 

Current 1) 

60 mA 

0.6 A 

6 A 

60 A 

80 A 30 mA 

0.3 A 

3 A 

30 A 

Continuous power 500 W 500 W 500 W 500 W 500 W 500 W 

Short-time power 2) 1,000 W 1,000 W 1,000 W - - - 

Current setting 

Resistance setting 

Power setting 3) 

0 ... 60 mA 

0 ... 0.6 A 

0 ... 6 A 

0 ... 60 A 

33.3 Ω ... 11.1 kΩ 

(max. 60 mA) 

3.33 Ω ... 1.11 kΩ 

(max. 0.6 A) 

0.33 Ω ... 111 Ω 

(max. 6 A) 

0.033 Ω ... 11.1 Ω 

(max. 60 A) 

0 ... 1 W 

0 ... 10 W 

0 ... 100W 

0 ... 1,000W 

0 ... 26.7 A 

0 ... 80 A 

0.075 Ω ... 25 Ω 

(max. 26.7 A) 

0.025 Ω ... 8.3 Ω 

(max. 80 A) 

0 ... 333 W 

0 ... 1,000W 

0 ... 30 mA 

0 ... 0.3 A 

0 ... 3 A 

0 ... 30 A 

67 Ω ... 44.4 kΩ 

(max. 30 mA) 

6.7 Ω ... 4.44 kΩ 

(max. 0.3 A) 

0.67 Ω ... 444 Ω 

(max. 3 A) 

0.067 Ω ... 44.4 Ω 

(max. 30 A) 

0 ... 1 W 

0 ... 10 W 

0 ... 100 W 

0 ... 1,000W 

120 mA 

1.2 A 

12 A 

0 ... 120 mA 

0 ... 1.2 A 

0 ... 12 A 

16.7 Ω ... 27.7 kΩ 

(max. 120 mA) 

1.67 Ω ... 2.77 kΩ 

(max. 1.2 A) 

0.167 Ω ... 277 Ω 

(max. 12 A) 

0 ... 5 W 

0 ... 50 W 

0 ... 500 W 

60 mA 

0.6 A 

6 A 

0 ... 60 mA 

0 ... 0.6 A 

0 ... 6 A 

33.3 Ω ... 111 kΩ 

(max. 60 mA) 

3.33 Ω ... 11.1 kΩ 

(max. 0.6 A) 

0.33 Ω ... 1.11 kΩ 

(max. 6 A) 

0 ... 5 W 

0 ... 50 W 

0 ... 500 W 

45 mA 

0.45 A 

4.5 A 

0 ... 45 mA 

0 ... 0.45 A 

0 ... 4.5 A 

44.4 Ω ... 197 kΩ 

(max. 45 mA) 

4.44 Ω ... 19.7 kΩ 

(max. 0.45 A) 

0.44 Ω ... 1.97 kΩ 

(max. 4.5 A) 

0 ... 5 W 

0 ... 50 W 

0 ... 500 W 

Rise/fall time 4) 60 µs 60 µs 60 µs 60 µs 60 µs 60 µs 

Load connections 5) FK15 FK15 FK15 with cover SB4 SB4 SB4 

Zero-Volt option 6) NV60 NV80 NV60 - - - 

Power consumption 50 VA 50 VA 50 VA 50 VA 50 VA 50 VA 

Noise max. 7) 53 dB(A) 53 dB(A) 53 dB(A) 53 dB(A) 53 dB(A) 53 dB(A) 

Weight 13 kg 13 kg 13 kg 13 kg 13 kg 13 kg 

Housing 8) 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 

Model 


ZS806 ZS812 ZS830 ZS860 ZS880 

Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 100 A 60 A 24 A 12 A 9 A 

Continuous power 800 W 800 W 800 W 800 W 800 W 

Short-time power 2) 1,600 W 1,600 W - - - 




0 ... 33 A 

0 ... 100 A 

0.06 Ω ... 20 Ω 

(max. 33 A) 

0.02 Ω ... 6.67 Ω 

(max. 100 A) 

0 ... 533 W 

0 ... 1,600 W 

0 ... 20 A 

0 ... 60 A 

0.1 Ω ... 66.7 Ω 

(max. 20 A) 

0.03 Ω ... 22.2 Ω 

(max. 60 A) 

0 ... 533 W 

0 ... 1,600 W 

0 ... 8 A 

0 ... 24 A 

0.25 Ω ... 416 Ω 

(max. 8 A) 

0.08 Ω ... 139 Ω 

(max. 24 A) 

0 ... 267 W 

0 ... 800 W 

0 ... 4 A 

0 ... 12 A 

0.5 Ω ... 1.67 kΩ 

(max. 4 A) 

0.17 Ω ... 555 Ω 

(max. 12 A) 

0 ... 267 W 

0 ... 800 W 

0 ... 3 A 

0 ... 9 A 

0.66 Ω ... 2.96 kΩ 

(max. 3 A) 

0.22 Ω ... 986 Ω 

(max. 9 A) 

0 ... 267 W 

0 ... 800 W 

Rise/fall time 4) 60 µs 60 µs 60 µs 60 µs 60 µs 

Load connections 5) FK15 FK15 with cover FK15 with cover SB4 SB4 

Zero-Volt option 6) - NV60 - - - 

Power consumption 65 VA 65 VA 65 VA 65 VA 65 VA 

Noise max. 7) 58 dB(A) 58 dB(A) 58 dB(A) 58 dB(A) 58 dB(A) 

Weight 13 kg 13 kg 13 kg 13 kg 13 kg 

Housing 8) 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 19“ - 2 HU 

1) Each range of the higher voltage classes 

of the same device power can also be 

selected as current range. 

2) Level and duration of the peak power, 

see diagram on page 31 

3) The setting range extends max. to the 

possible peak power. 

4) Rise and fall times are defined of 10 

% ... 90 % and 90 % ... 10 % of the 

maximum current. (current mode 

FAST, tolerance ±20 %) 

5) SB4: 4 mm safety socket 

BM8: M8 screw fitting 

FK15: Flat copper rail 15x5 mm with 

4 mm hole and M8 bolt 

6) There is no reverse polarity protection 

with the zero-volt option. 

7) Measured on the front from distance of 

1 m 

8) 1 HU = 44,45 mm 

18


1,800 W ... 4,800 W DC 

Model (order number) ZS1806 ZS1812 ZS1830 ZS1860 ZS1880 

Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 150 A 75 A 30 A 20 A 15 A 

Continuous power 1,800 W 1,800 W 1,800 W 1,800 W 1,800 W 

Short-time power 2) 4,200 W 4,200 W 2,800 W - - 


0 ... 50 A 

0 ... 150 A 

0 ... 25 A 

0 ... 75 A 

0 ... 10 A 

0 ... 30 A 

0 ... 6,67 A 

0 ... 20 A 

0 ... 5 A 

0 ... 15 A 




Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 300 A 150 A 60 A 40 A 30 A 







Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 450 A 225 A 90 A 60 A 45 A 






0.04 Ω ... 13.3 Ω 

(max. 50 A) 

0.013 Ω ... 4.44 Ω 

(max. 150 A) 

0 ... 1,400 W 

0 ... 4,200 W 

0 ... 100 A 

0 ... 300 A 

0.02 Ω ... 6.67 Ω 

(max. 100 A) 

7 mΩ ... 2.22 Ω 

(max. 300 A) 

0 ... 2,600 W 

0 ... 7,800 W 

0 ... 150 A 

0 ... 450 A 

0.013 Ω ... 4.44 Ω 

(max. 150 A) 

4.4 mΩ ... 1.48 Ω 

(max. 450 A) 

0 ... 3,600 W 

0 ... 10,800 W 

0.08 Ω ... 53.3 Ω 

(max. 25 A) 

0.03 Ω ... 17.7 Ω 

(max. 75 A) 

0 ... 1,400 W 

0 ... 4,200 W 

0 ... 50 A 

0 ... 150 A 

0.04 Ω ... 26.6 Ω 

(max. 50 A) 

0.013 Ω ... 8.89 Ω 

(max. 150 A) 

0 ... 2,600 W 

0 ... 7,800 W 

0 ... 75 A 

0 ... 225 A 

0.026 Ω ... 17.7 Ω 

(max. 75 A) 

8.9 mΩ ... 5.93 Ω 

(max. 225 A) 

0 ... 3,600 W 

0 ... 10,800 W 

0.2 Ω ... 333 Ω 

(max. 10 A) 

0.07 Ω ... 111 Ω 

(max. 30 A) 

0 ... 933 W 

0 ... 2,800 W 

0 ... 20 A 

0 ... 60 A 

0.1 Ω ... 167 Ω 

(max. 20 A) 

0.033 Ω ... 55.5 Ω 

(max. 60 A) 

0 ... 1,733 W 

0 ... 5,200 W 

0 ... 30 A 

0 ... 90 A 

0.067 Ω ... 111 Ω 

(max. 30 A) 

0.022 Ω ... 37 Ω 

(max. 90 A) 

0 ... 2,400 W 

0 ... 7,200 W 

0.3 Ω ... 1.0 kΩ 

(max. 6.67 A) 

0.1 Ω ... 333 Ω 

(max. 20 A) 

0 ... 600 W 

0 ... 1,800 W 

0 ... 13.3 A 

0 ... 40 A 

0.15 Ω ... 500 Ω 

(max. 13.3 A) 

0.05 Ω ... 167 Ω 

(max. 40 A) 

0 ... 1,000 W 

0 ... 3,000 W 

0 ... 20 A 

0 ... 60 A 

0.1 Ω ... 333 Ω 

(max. 20 A) 

0.033 Ω ... 111 Ω 

(max. 60 A) 

0 ... 1,400 W 

0 ... 4,200 W 

0.4 Ω ... 1.77 kΩ 

(max. 5 A) 

0.13 Ω ... 592 Ω 

(max. 15 A) 

0 ... 600 W 

0 ... 1,800 W 


Load connections 5) BM8 BM8 with cover BM8 with cover BM8 with cover BM8 with cover 

Zero-Volt option 6) NV150 NV80-E - - - 





0 ... 10 A 

0 ... 30 A 

0.2 Ω ... 888 Ω 

(max. 10 A) 

0.06 Ω ... 296 Ω 

(max. 30 A) 

0 ... 1,000 W 

0 ... 3,000 W 


Load connections 5) FK25 FK25 with cover FK25 with cover FK25 with cover FK25 with cover 



Weight 34 kg 35.5 kg 34 kg 35.5 kg 34 kg 


0 ... 15 A 

0 ... 45 A 

0.133 Ω ... 592 Ω 

(max. 15 A) 

0.044 Ω ... 197 Ω 

(max. 45 A) 

0 ... 1,400 W 

0 ... 4,200 W 






Housing 8) 19“-5 HU 19“-5 HU 19“-5 HU 19“-5 HU 19“-5 HU 









% ... 90 % and 90 % ... 10 % of the 






4 mm hole and M8 bolt 


4 mm hole and M10 and M12 bolt 

6) There is no reverse polarity protection 

with the zero-volt option. 


1 m 

8) 1HU = 44.45mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

19


5,600 W ... 9,600 W DC 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

Model 

ZS6406 ZS6412 ZS5630 ZS5660 ZS5680 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 600 A 300 A 120 A 80 A 60 A 






Model 

ZS8006 ZS8012 ZS7030 ZS7060 ZS7080 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 750 A 375 A 150 A 100 A 75 A 






Model 


ZS9606 ZS9612 ZS8430 ZS8460 ZS8480 

Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 900 A 450 A 180 A 120 A 90 A 






0 ... 200 A 

0 ... 600 A 

0.01 Ω ... 3.33 Ω 

(max. 200 A) 

3.3 mΩ ... 1.11 Ω 

(max. 600 A) 

0 ... 4,800 W 

0 ... 14,400 W 

0 ... 250 A 

0 ... 750 A 

8 mΩ ... 2.67 Ω 

(max. 250 A) 

2.7 mΩ ... 0.89 Ω 

(max. 750 A) 

0 ... 6,000 W 

0 ... 18,000 W 

0 ... 300 A 

0 ... 900 A 

6.7 mΩ ... 2.22 Ω 

(max. 300 A) 

2.2 mΩ ... 0.74 Ω 

(max. 900 A) 

0 ... 7,200 W 

0 ... 21,600 W 

0 ... 100 A 

0 ... 300 A 

0.02 Ω ... 13.3 Ω 

(max. 100 A) 

6.7 mΩ ... 4.44 Ω 

(max. 300 A) 

0 ... 4,800 W 

0 ... 14,400 W 

0 ... 125 A 

0 ... 375 A 

0.016 Ω ... 10.6 Ω 

(max. 125 A) 

5.3 mΩ ... 3.56 Ω 

(max. 375 A) 

0 ... 6,000 W 

0 ... 18,000 W 

0 ... 150 A 

0 ... 450 A 

0.013 Ω ... 8.89 Ω 

(max. 150 A) 

4.4 mΩ ... 2.96 Ω 

(max. 450 A) 

0 ... 7,200 W 

0 ... 21,600 W 

0 ... 40 A 

0 ... 120 A 

0.05 Ω ... 83.3 Ω 

(max. 40 A) 

0.016 Ω ... 27.7 Ω 

(max. 120 A) 

0 ... 3,200 W 

0 ... 9,600 W 

0 ... 50 A 

0 ... 150 A 

0.04 Ω ... 66.7 Ω 

(max. 50 A) 

0.013 Ω ... 22.2 Ω 

(max. 150 A) 

0 ... 4,000 W 

0 ... 12,000 W 

0 ... 60 A 

0 ... 180 A 

0.033 Ω ... 55.6 Ω 

(max. 60 A) 

0.011 Ω ... 18.5 Ω 

(max. 180 A) 

0 ... 4,800 W 

0 ... 14,400 W 

0 ... 26.7 A 

0 ... 80 A 

0.075 Ω ... 250 Ω 

(max. 26.7 A) 

0.025 Ω ... 83.3 Ω 

(max. 80 A) 

0 ... 1,867 W 

0 ... 5,600 W 

0 ... 33 A 

0 ... 100 A 

0.06 Ω ... 200 Ω 

(max. 33 A) 

0.02 Ω ... 66.7 Ω 

(max. 100 A) 

0 ... 2,333 W 

0 ... 7,000 W 

0 ... 40 A 

0 ... 120 A 

0.05 Ω ... 167 Ω 

(max. 40 A) 

0.016 Ω ... 55.6 Ω 

(max. 120 A) 

0 ... 2,800 W 

0 ... 8,400 W 

0 ... 20 A 

0 ... 60 A 

0.1 Ω ... 444 Ω 

(max. 20 A) 

0.033 Ω ... 148 Ω 

(max. 60 A) 

0 ... 1,867 W 

0 ... 5,600 W 







0 ... 25 A 

0 ... 75 A 

0.08 Ω ... 355 Ω 

(max. 25 A) 

0.027 Ω ... 118 Ω 

(max. 75 A) 

0 ... 2,333 W 

0 ... 7,000 W 







0 ... 30 A 

0 ... 90 A 

0.067 Ω ... 296 Ω 

(max. 30 A) 

0.022 Ω ... 98.6 Ω 

(max. 90 A) 

0 ... 2,800 W 

0 ... 8,400 W 















% ... 90 % and 90 % ... 10 % of the 










1 m 

7) 1HU = 44.45 mm 

20


9,800 W ... 14,400 W DC 

Model 

ZS9880 

ZS11206 ZS11212 ZS9830 ZS9860 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,050 A 525 A 210 A 140 A 105 A 






Model 


ZS12806 ZS12812 ZS11230 ZS11260 ZS11280 

Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,200 A 600 A 240 A 160 A 120 A 






Model 

ZS14406 ZS14412 ZS12630 ZS12660 ZS12680 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,350 A 675 A 270 A 180 A 135 A 






0 ... 350 A 

0 ... 1,050 A 

5.7 mΩ ... 1.9 Ω 

(max. 350 A) 

2 mΩ ... 0.63 Ω 

(max. 1,050 A) 

0 ... 8,400 W 

0 ... 25,200 W 

0 ... 400 A 

0 ... 1.200 A 

5 mΩ ... 1.67 Ω 

(max. 400 A) 

1.7 mΩ ... 0.56 Ω 

(max. 1,200 A) 

0 ... 9,600 W 

0 ... 28,800 W 

0 ... 450 A 

0 ... 1,350 A 

4.4 mΩ ... 1.48 Ω 

(max. 450 A) 

1.5 mΩ ... 0.49 Ω 

(max. 1,350 A) 

0 ... 10,800 W 

0 ... 32,400 W 

0 ... 175 A 

0 ... 525 A 

0.011 Ω ... 7.62 Ω 

(max. 175 A) 

3.8 mΩ ... 2.54 Ω 

(max. 525 A) 

0 ... 8,400 W 

0 ... 25,200 W 

0 ... 200 A 

0 ... 600 A 

0.01 Ω ... 6.67 Ω 

(max. 200 A) 

3.3 mΩ ... 2.22 Ω 

(max. 600 A) 

0 ... 9,600 W 

0 ... 28,800 W 

0 ... 225 A 

0 ... 675 A 

8.9 mΩ ... 5.9 Ω 

(max. 225 A) 

2.9 mΩ ... 1.98 Ω 

(max. 675 A) 

0 ... 10,800 W 

0 ... 32,400 W 

0 ... 70 A 

0 ... 210 A 

0.028 Ω ... 47 Ω 

(max. 70 A) 

0.01 Ω ... 15.8 Ω 

(max. 210 A) 

0 ... 5,600 W 

0 ... 16,800 W 

0 ... 80 A 

0 ... 240 A 

0.025 Ω ... 41.7 Ω 

(max. 80 A) 

8.3 mΩ ... 13.9 Ω 

(max. 240 A) 

0 ... 6,400 W 

0 ... 19,200 W 

0 ... 90 A 

0 ... 270 A 

0.022 Ω ... 37 Ω 

(max. 90 A) 

7.4 mΩ ... 12.3 Ω 

(max. 270 A) 

0 ... 7,200 W 

0 ... 21,600 W 

0 ... 47 A 

0 ... 140 A 

0.043 Ω ... 142 Ω 

(max. 47 A) 

0.014 Ω ... 47 Ω 

(max. 140 A) 

0 ... 3,267 W 

0 ... 9,800 W 

0 ... 53 A 

0 ... 160 A 

0.037 Ω ... 125 Ω 

(max. 53 A) 

0.012 Ω ... 41.7 Ω 

(max. 160 A) 

0 ... 3,733 W 

0 ... 11,200 W 

0 ... 60 A 

0 ... 180 A 

0.033 Ω ... 111 Ω 

(max. 60 A) 

0.011 Ω ... 37 Ω 

(max. 180 A) 

0 ... 4,200 W 

0 ... 12,600 W 

0 ... 35 A 

0 ... 105 A 

0.057 Ω ... 253 Ω 

(max. 35 A) 

0.019 Ω ... 84.3 Ω 

(max. 105 A) 

0 ... 3,267 W 

0 ... 9,800 W 







0 ... 40 A 

0 ... 120 A 

0.05 Ω ... 222 Ω 

(max. 40 A) 

0.017 Ω ... 74 Ω 

(max. 120 A) 

0 ... 3,733 W 

0 ... 11,200 W 







0 ... 45 A 

0 ... 135 A 

0.044 Ω ... 197 Ω 

(max. 45 A) 

0.014 Ω ... 65.6 Ω 

(max. 135 A) 

0 ... 4,200 W 

0 ... 12,600 W 















% ... 90 % and 90 % ... 10 % of the 










1 m 

7) 1HU = 44.45 mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

21


14,000 W ... 19,200 W DC 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

Model 

ZS16006 ZS16012 ZS14030 ZS14060 ZS14080 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,500 A 750 A 300 A 200 A 150 A 






Model 

ZS15480 

ZS17606 ZS17612 ZS15430 ZS15460 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,650 A 825 A 330 A 220 A 165 A 






Model 


ZS19206 ZS19212 ZS16830 ZS16860 ZS16880 

Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,800 A 900 A 360 A 240 A 180 A 






0 ... 500 A 

0 ... 1,500 A 

4 mΩ ... 1.33 Ω 

(max. 500 A) 

1.3 mΩ ... 0.44 Ω 

(max. 1,500 A) 

0 ... 12,000 W 

0 ... 36,000 W 

0 ... 550 A 

0 ... 1,650 A 

3.6 mΩ ... 1.21 Ω 

(max. 550 A) 

1.2 mΩ ... 0.4 Ω 

(max. 1,650 A) 

0 ... 13,200 W 

0 ... 39,600 W 

0 ... 600 A 

0 ... 1,800 A 

3.3 mΩ ... 1.11 Ω 

(max. 600 A) 

1.1 mΩ ... 0.37 Ω 

(max. 1,800 A) 

0 ... 14,400 W 

0 ... 43,200 W 

0 ... 250 A 

0 ... 750 A 

8 mΩ ... 5.33 Ω 

(max. 250 A) 

2.7 mΩ ... 1.78 Ω 

(max. 750 A) 

0 ... 12,000 W 

0 ... 36,000 W 

0 ... 275 A 

0 ... 825 A 

7.3 mΩ ... 4.85 Ω 

(max. 275 A) 

2.4 mΩ ... 1.62 Ω 

(max. 825 A) 

0 ... 13,200 W 

0 ... 39,600 W 

0 ... 300 A 

0 ... 900 A 

6.7 mΩ ... 4.44 Ω 

(max. 300 A) 

2.2 mΩ ... 1.48 Ω 

(max. 900 A) 

0 ... 14,400 W 

0 ... 43,200 W 

0 ... 100 A 

0 ... 300 A 

0.02 Ω ... 33.3 Ω 

(max. 100 A) 

6.7 mΩ ... 11.1 Ω 

(max. 300 A) 

0 ... 8,000 W 

0 ... 24,000 W 

0 ... 110 A 

0 ... 330 A 

0.018 Ω ... 30.3 Ω 

(max. 110 A) 

6 mΩ ... 10.1 Ω 

(max. 330 A) 

0 ... 8,800 W 

0 ... 26,400 W 

0 ... 120 A 

0 ... 360 A 

0.017 Ω ... 27.7 Ω 

(max. 120 A) 

5.6 mΩ ... 9.3 Ω 

(max. 360 A) 

0 ... 9,600 W 

0 ... 28,800 W 

0 ... 67 A 

0 ... 200 A 

0.03 Ω ... 100 Ω 

(max. 67 A) 

0.01 Ω ... 33.3 Ω 

(max. 200 A) 

0 ... 4,667 W 

0 ... 14,000 W 

0 ... 73 A 

0 ... 220 A 

0.027 Ω ... 90.9 Ω 

(max. 73 A) 

9 mΩ ... 30.3 Ω 

(max. 220 A) 

0 ... 5,133 W 

0 ... 15,400 W 

0 ... 80 A 

0 ... 240 A 

0.025 Ω ... 83.3 Ω 

(max. 80 A) 

8.3 mΩ ... 27.8 Ω 

(max. 240 A) 

0 ... 5,600 W 

0 ... 16,800 W 

0 ... 50 A 

0 ... 150 A 

0.04 Ω ... 177 Ω 

(max. 50 A) 

0.013 Ω ... 59 Ω 

(max. 150 A) 

0 ... 4,667 W 

0 ... 14,000 W 







0 ... 55 A 

0 ... 165 A 

0.036 Ω ... 161 Ω 

(max. 55 A) 

0.012 Ω ... 53.6 Ω 

(max. 165 A) 

0 ... 5,133 W 

0 ... 15,400 W 







0 ... 60 A 

0 ... 180 A 

0.033 Ω ... 148 Ω 

(max. 60 A) 

0.011 Ω ... 49.3 Ω 

(max. 180 A) 

0 ... 5,600 W 

0 ... 16,800 W 















% ... 90 % and 90 % ... 10 % of the 










1 m 

7) 1HU = 44.45 mm 

22


18,200 W ... 24,000 W DC 

Model 

ZS20806 ZS20812 ZS18230 ZS18260 ZS18280 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 1,950 A 975 A 390 A 260 A 195 A 






Model 

ZS22406 ZS22412 ZS19630 ZS19660 ZS19680 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 2,100 A 1,050 A 420 A 280 A 210 A 






Model 

ZS24006 ZS24012 ZS21030 ZS21060 ZS21080 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 2,250 A 1,125 A 450 A 300 A 225 A 






0 ... 650 A 

0 ... 1,950 A 

3 mΩ ... 1 Ω 

(max. 650 A) 

1 mΩ ... 0.34 Ω 

(max. 1,950 A) 

0 ... 15,600 W 

0 ... 46,800 W 

0 ... 700 A 

0 ... 2,100 A 

2.9 mΩ ... 0.95 Ω 

(max. 700 A) 

1 mΩ ... 0.32 Ω 

(max. 2,100 A) 

0 ... 16,800 W 

0 ... 50,400 W 

0 ... 750 A 

0 ... 2,250 A 

2.7 mΩ ... 0.89 Ω 

(max. 750 A) 

0.89 mΩ ... 0.3 Ω 

(max. 2,250 A) 

0 ... 18,000 W 

0 ... 54,000 W 

0 ... 325 A 

0 ... 975 A 

6 mΩ ... 4.1 Ω 

(max. 325 A) 

2 mΩ ... 1.37 Ω 

(max. 975 A) 

0 ... 15,600 W 

0 ... 46,800 W 

0 ... 350 A 

0 ... 1,050 A 

5.7 mΩ ... 3.81 Ω 

(max. 350 A) 

1.9 mΩ ... 1.27 Ω 

(max. 1,050 A) 

0 ... 16,800 W 

0 ... 50,400 W 

0 ... 375 A 

0 ... 1,125 A 

5.3 mΩ ... 3.56 Ω 

(max. 375 A) 

1.8 mΩ ... 1.19 Ω 

(max. 1,125 A) 

0 ... 18,000 W 

0 ... 54,000 W 

0 ... 130 A 

0 ... 390 A 

0.015 Ω ... 25.6 Ω 

(max. 130 A) 

5 mΩ ... 8.55 Ω 

(max. 390 A) 

0 ... 10,400 W 

0 ... 31,200 W 

0 ... 140 A 

0 ... 420 A 

0.014 Ω ... 23.8 Ω 

(max. 140 A) 

4.7 mΩ ... 7.94 Ω 

(max. 420 A) 

0 ... 11,200 W 

0 ... 33,600 W 

0 ... 150 A 

0 ... 450 A 

0.013 Ω ... 22.2 Ω 

(max. 150 A) 

4.4 mΩ ... 7.41 Ω 

(max. 450 A) 

0 ... 12,000 W 

0 ... 36,000 W 

0 ... 87 A 

0 ... 260 A 

0.023 Ω ... 76.9 Ω 

(max. 87 A) 

7.7 mΩ ... 25.6 Ω 

(max. 260 A) 

0 ... 6,067 W 

0 ... 18,200 W 

0 ... 93 A 

0 ... 280 A 

0.021 Ω ... 71.4 Ω 

(max. 93 A) 

7.1 mΩ ... 23.8 Ω 

(max. 280 A) 

0 ... 6,533 W 

0 ... 19,600 W 

0 ... 100 A 

0 ... 300 A 

0.02 Ω ... 66.7 Ω 

(max. 100 A) 

6.7 mΩ ... 22.2 Ω 

(max. 300 A) 

0 ... 7,000 W 

0 ... 21,000 W 

0 ... 65 A 

0 ... 195 A 

0.03 Ω ... 136 Ω 

(max. 65 A) 

0.01 Ω ... 45.3 Ω 

(max. 195 A) 

0 ... 6,067 W 

0 ... 18,200 W 







0 ... 70 A 

0 ... 210 A 

0.028 Ω ... 126 Ω 

(max. 70 A) 

9.5 mΩ ... 42 Ω 

(max. 210 A) 

0 ... 6,533 W 

0 ... 19,600 W 







0 ... 75 A 

0 ... 225 A 

0.026 Ω ... 118 Ω 

(max. 75 A) 

8.8 mΩ ... 39.3 Ω 

(max. 225 A) 

0 ... 7,000 W 

0 ... 21,000 W 















% ... 90 % and 90 % ... 10 % of the 










1 m 

7) 1HU = 44.45 mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

23


22,400W ... 28,800W DC 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

Model 

ZS25606 ZS25612 ZS22430 ZS22460 ZS22480 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 2,400 A 1,200 A 480 A 320 A 240 A 






Model 

ZS27206 ZS27212 ZS23830 ZS23860 ZS23880 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 2,550 A 1,275 A 510 A 340 A 255 A 






Model 

ZS28806 ZS28812 ZS25230 ZS25260 ZS25280 


Voltage 60 V 120 V 300 V 600 V 800 V 

Current 1) 2,700 A 1,350 A 540 A 360 A 270 A 






0 ... 800 A 

0 ... 2,400 A 

2.5 mΩ ... 0.83 Ω 

(max. 800 A) 

0.83 mΩ ... 0.28 Ω 

(max. 2,400 A) 

0 ... 19,200 W 

0 ... 57,600 W 

0 ... 850 A 

0 ... 2,550 A 

2.4 mΩ ... 0.78 Ω 

(max. 850 A) 

0.8 mΩ ... 0.26 Ω 

(max. 2,550 A) 

0 ... 20,400 W 

0 ... 61,200 W 

0 ... 900 A 

0 ... 2,700 A 

2.2 mΩ ... 0.74 Ω 

(max. 900 A) 

0.74 mΩ ... 0.25 Ω 

(max. 2,700 A) 

0 ... 21,600 W 

0 ... 64,800 W 

0 ... 400 A 

0 ... 1,200 A 

5 mΩ ... 3.33 Ω 

(max. 400 A) 

1.7 mΩ ... 1.11 Ω 

(max. 1,200 A) 

0 ... 19,200 W 

0 ... 57,600 W 

0 ... 425 A 

0 ... 1,275 A 

4.7 mΩ ... 3.14 Ω 

(max. 425 A) 

1.6 mΩ ... 1.05 Ω 

(max. 1,275 A) 

0 ... 20,400 W 

0 ... 61,200 W 

0 ... 450 A 

0 ... 1,350 A 

4.4 mΩ ... 2.96 Ω 

(max. 450 A) 

1.5 mΩ ... 0.99 Ω 

(max. 1,350 A) 

0 ... 21,600 W 

0 ... 64,800 W 

0 ... 160 A 

0 ... 480 A 

0.013 Ω ... 20.8 Ω 

(max. 160 A) 

4.2 mΩ ... 6.9 Ω 

(max. 480 A) 

0 ... 12,800 W 

0 ... 38,400 W 

0 ... 170 A 

0 ... 510 A 

0.012 Ω ... 19.6 Ω 

(max. 170 A) 

3.9 mΩ ... 6.54 Ω 

(max. 510 A) 

0 ... 13,600 W 

0 ... 40,800 W 

0 ... 180 A 

0 ... 540 A 

0.011 Ω ... 18.5 Ω 

(max. 180 A) 

3.7 mΩ ... 6.17 Ω 

(max. 540 A) 

0 ... 14,400 W 

0 ... 43,200 W 

0 ... 107 A 

0 ... 320 A 

0.019 Ω ... 62.5 Ω 

(max. 107 A) 

6.3 mΩ ... 20.8 Ω 

(max. 320 A) 

0 ... 7,467 W 

0 ... 22,400 W 

0 ... 113 A 

0 ... 340 A 

0.018 Ω ... 58.8 Ω 

(max. 113 A) 

5.9 mΩ ... 19.6 Ω 

(max. 340 A) 

0 ... 7,933 W 

0 ... 23,800 W 

0 ... 120 A 

0 ... 360 A 

0.017 Ω ... 55.6 Ω 

(max. 120 A) 

5.6 mΩ ... 18.5 Ω 

(max. 360 A) 

0 ... 8,400 W 

0 ... 25,200 W 

0 ... 80 A 

0 ... 240 A 

0.025 Ω ... 111 Ω 

(max. 80 A) 

8.3 mΩ ... 37 Ω 

(max. 240 A) 

0 ... 7,467 W 

0 ... 22,400 W 







0 ... 85 A 

0 ... 255 A 

0.023 Ω ... 104 Ω 

(max. 85 A) 

7.8 mΩ ... 34.6 Ω 

(max. 255 A) 

0 ... 7,933 W 

0 ... 23,800 W 



Power consumption 1,050 VA 1,050 VA 1,050 VA 1,050 VA 1,050 VA 




0 ... 90 A 

0 ... 270 A 

0.022 Ω ... 98.7 Ω 

(max. 90 A) 

7.4 mΩ ... 32.9 Ω 

(max. 270 A) 

0 ... 8,400 W 

0 ... 25,200 W 






Housing 7) 19“ - 20 HU 19 “- 20 HU 19“ - 20 HU 19“ - 20 HU 19“ - 20 HU 









% ... 90 % and 90 % ... 10 % of the 










1 m 

7) 1HU = 44.45 mm 

24

For our customers, precision is key



ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Slource-Sink 

Accessories 

Software 

Electronic Loads, ZSLC Series 

Water-cooled 


RS-232 

O 

USB 

O 

GPIB 

O 

LAN 

O 

System bus 

O 

Analog 

X 


O 


High power density by water-cooling 

Power 8,000 W ... 40,000 W 

Minimal operating noise 

Temperature-controlled coolant circuit 

Condensation protection 

For coolant with up to 30 % glycol 

Features 

The liquid-cooled loads of the 

ZSLC series have all the features 

of the ZS series. 

Water cooling 

Water cooling is a very efficient 

heat dispersion method which 

does not heat the environment. 

It is also very quiet. The use of 

water-cooled devices is therefore 

particularly suited for areas in 

which correspondingly highperformance 

air-cooled devices 

cannot be used because of their 

thermal load and noise. The 

devices are also considerably 

more compact. 

Coolant 

ZSLC16006 

The coolant must have a pHvalue 

of between 6 and 8. 

A glycol portion of 20% to 

30% is permissible. 

Coolant consumption is 

controlled according to power. 

Coolant feed is switched off in 

standby mode. 

The maximum coolant 

temperature for the rated 

power is 12 °C. Power derating 

should be considered at higher 

temperatures. 

A correspondingly lower 

coolant quantity is needed at 

inlet temperatures of less than 

12 °C. 

Current, voltage, resistance, power-mode 

Dynamic loads 





fed with sufficient coolant 

it requires an operating pressure 

of 3 bar at the inlet. 

Drainage must be possible 

without creating back pressure. 

The required flow rate can be 

found in the type overview. 

Condensation protection 

The ZSLC devices are protected 

against condensation of liquid by 

cold coolant. 

GTC 

To ensure that the device is 

Coolant distributor 

26


8,000 W ... 24,000 W DC Water-cooled 

Model 

ZSLC8006 ZSLC8012 ZSLC8030 ZSLC8060 


Voltage 60 V 120 V 300 V 600 V 

Current 1) 500 A 350 A 200 A 100 A 

Continuous power 8,000 W 8,000 W 8,000 W 8,000 W 



Power setting 

Model 



Voltage 60 V 120 V 300 V 600 V 

Current 1) 1,000 A 700 A 400 A 200 A 




Power setting 

1) Each range of the higher voltage 

classes of the same device power can 

also be selected as current range. 

0 ... 166 A 

0 ... 500 A 

12 mΩ ... 4 Ω 

(max. 166 A) 

4 mΩ ... 1.33 Ω 

(max. 500 A) 

0 ... 2,667 W 

0 ... 8,000 W 

0 ... 333 A 

0 ... 1,000 A 

6 mΩ ... 2 Ω 

(max. 333 A) 

2 mΩ ... 0.66 Ω 

(max. 1,000 A) 

0 ... 5,333 W 

0 ... 16,000 W 


% ... 90 % and 90 % ... 10 % of the 



0 ... 116 A 

0 ... 350 A 

17 mΩ ... 11.4 Ω 

(max. 116 A) 

5.7 mΩ ... 3.8 Ω 

(max. 350 A) 

0 ... 2,667 W 

0 ... 8,000 W 

0 ... 233 A 

0 ... 700 A 

8.5 mΩ ... 5.71 Ω 

(max. 233 A) 

2.8 mΩ ... 1.9 Ω 

(max. 700 A) 

0 ... 5,333 W 

0 ... 16,000 W 

0 ... 67 A 

0 ... 200 A 

30 mΩ ... 50 Ω 

(max. 67 A) 

10 mΩ ... 16.7 Ω 

(max. 200 A) 

0 ... 2,667 W 

0 ... 8,000 W 

0 ... 133 A 

0 ... 400 A 

15 mΩ ... 25 Ω 

(max. 133 A) 

5 mΩ ... 8.33 Ω 

(max. 400 A) 

0 ... 5,333 W 

0 ... 16,000 W 

3) FK40: Flat copper rail 40x12 mm with 


0 ... 33 A 

0 ... 100 A 

60 mΩ ... 200 Ω 

(max. 33 A) 

20 mΩ ... 66.7 Ω 

(max. 100 A) 

0 ... 2,667 W 

0 ... 8,000 W 

Rise/fall time 2) 500 µs 500 µs 400 µs 400 µs 

Load connections 3) FK40 FK40 with cover FK40 with cover FK40 with cover 

Power consumption 70 VA 70 VA 70 VA 70 VA 

Coolant consumption 4) 15 l/min 15 l/min 15 l/min 15 l/min 

No. of coolant connections 1 1 1 1 

Weight 54 kg 54 kg 54 kg 54 kg 

Housing 5) 19“ - 5 HU 19“ - 5 HU 19“ - 5 HU 19“ - 5 HU 

0 ... 66 A 

0 ... 200 A 

30 mΩ ... 100 Ω 

(max. 66 A) 

10 mΩ ... 33.3 Ω 

(max. 200 A) 

0 ... 5,333 W 

0 ... 16,000 W 








Model 



Voltage 60 V 120 V 300 V 600 V 

Current 1) 1,500 A 1,050 A 600 A 300 A 




Power setting 

0 ... 500 A 

0 ... 1,500 A 

4 mΩ ... 1.33 Ω 

(max. 500 A) 

1.3 mΩ ... 0.44 Ω 

(max. 1,500 A) 

0 ... 8,000 W 

0 ... 24,000 W 

0 ... 350 A 

0 ... 1,050 A 

5.7 mΩ ... 3.8 Ω 

(max. 350 A) 

1.9 mΩ ... 1.26 Ω 

(max. 1,050 A) 

0 ... 8,000 W 

0 ... 24,000 W 

0 ... 200 A 

0 ... 600 A 

10 mΩ ... 16.6 Ω 

(max. 200 A) 

3.3 mΩ ... 5.55 Ω 

(max. 600 A) 

0 ... 8,000 W 

0 ... 24,000 W 

0 ... 100 A 

0 ... 300 A 

20 mΩ ... 66.6 Ω 

(max. 100 A) 

6.7 mΩ ... 22.2 Ω 

(max. 300 A) 

0 ... 8,000 W 

0 ... 24,000 W 








4) At a coolant temperature of 12 °C 

5) 1 HU = 44.45 mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

27


32,000 W ... 40,000 W DC Water-cooled 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Model 



Voltage 60 V 120 V 300 V 600 V 

Current 1) 2,000 A 1,400 A 800 A 400 A 




Power setting 

Model 



Voltage 60 V 120 V 300 V 600 V 

Current 1) 2,500 A 1,750 A 1,000 A 500 A 




Power setting 

0 ... 666 A 

0 ... 2,000 A 

3 mΩ ... 1 Ω 

(max. 666 A) 

1 mΩ ... 0.33 Ω 

(max. 2,000 A) 

0 ... 10,667 W 

0 ... 32,000 W 

0 ... 833 A 

0 ... 2,500 A 

2.4 mΩ ... 0.8 Ω 

(max. 833 A) 

0.8 mΩ ... 0.267 Ω 

(max. 2,500 A) 

0 ... 13,333 W 

0 ... 40,000 W 

0 ... 466 A 

0 ... 1,400 A 

4.2 mΩ ... 2.85 Ω 

(max. 466 A) 

1.4 mΩ ... 0.95 Ω 

(max. 1,400 A) 

0 ... 10,667 W 

0 ... 32,000 W 

0 ... 583 A 

0 ... 1,750 A 

3.4 mΩ ... 2.28 Ω 

(max. 583 A) 

1.1 mΩ ... 0.76 Ω 

(max. 1,750 A) 

0 ... 13,333 W 

0 ... 40,000 W 

0 ... 266 A 

0 ... 800 A 

7.5 mΩ ... 12.5 Ω 

(max. 266 A) 

2.5 mΩ ... 4.16 Ω 

(max. 800 A) 

0 ... 10,667 W 

0 ... 32,000 W 

0 ... 333 A 

0 ... 1,000 A 

6 mΩ ... 10 Ω 

(max. 333 A) 

2 mΩ ... 3.33 Ω 

(max. 1,000 A) 

0 ... 13,333 W 

0 ... 40,000 W 

0 ... 133 A 

0 ... 400 A 

20 mΩ ... 66.6 Ω 

(max. 133 A) 

6.6 mΩ ... 22.2 Ω 

(max. 400 A) 

0 ... 10,667 W 

0 ... 32,000 W 








0 ... 167 A 

0 ... 500 A 

12 mΩ ... 40 Ω 

(max. 167 A) 

4 mΩ ... 13.3 Ω 

(max. 500 A) 

0 ... 13,333 W 

0 ... 40,000 W 








Software 

GTC 

ZSLC16006 

1) Each range of the higher voltage 

classes of the same device power can 

also be selected as current range. 


% ... 90 % and 90 % ... 10 % of the 



3) FK40: Flat copper rail 40x12 mm with 4 

mm hole and M12 and M16 bolt 

4) At a coolant temperature of 12 °C 

5) 1 HU = 44.45 mm 

28



RS-232 

O 

USB 

O 

GPIB 

O 

LAN 

O 

System bus 

O 

Analog 

X 


O 


Specially designed for testing fuel cells 

Currents up to 2,250 A 

Power 1,000 W ... 6,000 W 

Full current at 150 mV input voltage 


Dynamic loads 


Model 

ZSLV1002 ZSLV1502 ZSLV2002 ZSLV4002 ZSLV6002 


Voltage 20 V 20 V 20 V 20 V 20 V 

Current 220 A 500 A 750 A 1,500 A 2,250 A 

Vmin @ Imax 150 mV 150 mV 175 mV 200 mV 200 mV 




Power setting 

0 ... 73 A 

0 ... 220 A 

2 mΩ ... 3 Ω 

(max. 73 A) 

0.7 mΩ ... 1 Ω 

(max. 220 A) 

0 ... 333 W 

0 ... 1,000 W 

Electronic Loads, ZSLV series 

Low Voltage 

1,000 W ... 6,000 W DC Low Voltage 

0 ... 166 A 

0 ... 500 A 

0.9 mΩ ... 1.33 Ω 

(max. 166 A) 

0.3 mΩ ... 0.44 Ω 

(max. 500 A) 

0 ... 500 W 

0 ... 1,500 W 




0 ... 250 A 

0 ... 750 A 

0.7 mΩ ... 0.9 Ω 

(max. 250 A) 

0.23 mΩ ... 0.3 Ω 

(max. 750 A) 

0 ... 666 W 

0 ... 2,000 W 

0 ... 500 A 

0 ... 1,500 A 

0.4 mΩ ... 0.45 Ω 

(max. 500 A) 

0.13 mΩ ... 0.15 Ω 

(max. 1,500 A) 

0 ... 1,333 W 

0 ... 4,000 W 

0 ... 750 A 

0 ... 2,250 A 

0.27 mΩ ... 0.26 Ω 

(max. 750 A) 

0.09 mΩ ... 0.087 Ω 

(max. 2,250 A) 

0 ... 2,000 W 

0 ... 6,000 W 


Load connections 2) FK50 FK50 FK50 FK50 FK50 





1) Rise and fall times are defined as 

10% ... 90% and 90% ... 10% of the 

maximum current. 

(current mode FAST, tolerance ±20%) 

ZSLV1502 

2) FK50: flat copper rail 50x10 mm with 

M12 bolt 

3) Measured on the front from distance 

of 1 m 

4) 1 HU = 44.45 mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

29


Technical data ZS, ZSLC, ZSLV series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source_Sink 

Acessories 

Accuracy of manual setting, no preset function 



Voltage ±0.2 % ±0.05 % 

Current 

ZS,ZSLC 

ZSLV 

±0.2 % 

±0.3 % 

Accuracy of manual setting via preset function 


±0.05 % 

±0.1 % 


Voltage ±0.6 % ±0.05 % 

Current 

ZS,ZSLC 

ZSLV 

Resistance 

ZS,ZSLC 

ZSLV 

Power 

ZS,ZSLC 

ZSLV 

±0.6 % 

±0.7 % 

±0.05 % 

±0.1 % 

±1.4 % ±0.3 % of current range 

±0.5 % of current range 

±1.4 % ±0.5 % 

±1 % 

Current protection ±1.4 % ±0.3 % 

Trigger voltage ±1.4 % ±0.3 % 





Voltage ±0.2 % ±0.05 % ±1 digit 

Current ±0.2 % ±0.05 % ±1 digit 


0 ... 5 V / 0 ... 10 V for current, voltage, power 



Voltage ±0.2 % ±0.1 % 

Current 

Power 

ZS,ZSLC 

ZSLV 

ZS,ZSLC 

ZSLV 

±0.2 % 

±0.3 % 

±2 % 

±2.5 % 

±0.1 % 

±0.2 % 

±0.5 % 

±1 % 

Current protection * ±1 % ±0.4 % 

Trigger voltage * ±1 % ±0.4 % 

* only if option ZS08 is installed 

Input resistance of analog inputs >10 kΩ 

GND max. ±2 V with respect to negative load input 1) 


0 ... 10 V for current, voltage, power 2) 


real value 

Offset voltage 


Current 

Power 

ZS,ZSLC 

ZSLV 

ZS,ZSLC 

ZSLV 

±0.2 % 

±0.3 % 

±2 % 

±2.5 % 


Minimal load 2 kΩ 

±15 mV 

±30 mV 

±30 mV 

±60 mV 

External control functions 

Via Analog I/O 

Interface 

Load on - off 

Trigger input and output 

Range switching 

Operating mode switching 

Remote shut down 


Programming via data interface 

of setting of the corresponding range 

Voltage ±0.2 % ±0.05 % 

Current ZS,ZSLC 

ZSLV 

Resistance ZS,ZSLC 

ZSLV 

Power 

ZS,ZSLC 

ZSLV 

±0.2 % 

±0.3 % 

±0.05 % 

±0.05 % 



±1 % ±0.5 % 

±1 % 

Current protection ±1 % ±0.3 % 

Trigger voltage ±1 % ±0.3 % 

Resolution of 16 Bit 

setting 

Accuracy off measurement, read out via data interface 

of the measured of the corresponding range 


Voltage ±0.1 % ±0.05 % 

Current ±0.2 % ±0.05 % 

Resolution of meas. 18 Bit 

Sampling rate 330 ms, not triggerable 

Accuracy off measurement, read out via data interface 

Option ZS13 



Voltage ±0.15 % ±0.07 % 

Current ±0.3 % ±0.07 % 

Resolution of meas. 13 Bit 

Sampling rate minimal 200 µs (into memory) 

triggerable 

Dynamics 

2 currents and 

2 times can be set 

independently 

Time ranges 100 ms 1000 ms 

Accuracy of time 

setting 

of setting 

±1.4 % 


±0.5 % 

Software 

GTC 

ZSLV1502 

1) 500 V with option ZS06 (apart from Zero- 

Volt option) 

2) In the case of units with 3 and 4 setting 

ranges the power-proportional 

measurement signal is related to the 

selected setting range. 

30


Input 





ZS-devices up to 120V 

ZS-devices from 300V 

ZSLC 

ZSLV 

Permissible 


Standard 

with ZS06 option 


approx. 2 µF / 1,000 W 

up to 3 devices in Master-Slave mode 


Vmin: 

negative - housing 

125 V DC 

500 V DC 3) 

1 V 

2 V 

2 V 

see type overview 

Protective devices Over-current and over-power protection 

Over-voltage protection up to 110% of rated 

voltage 1) 

Reverse polarity protection with diode up to rated 

current 2) 

Over-temperature cut-off 

Transient protection 

Rated power up to TA = 21 °C 


Overload capacity 

The max. possible overload Po 

depends on the temperature of 

the device and therefore on the 

previously consumed continuous 

power Pd. 

see type overview / diagram 

The possible overload duration 

depends on the value of the 

overload Px. 


Operating 

5 °C ... 40 °C 

temperature 

Cooling 

Variable controlled fans 

Liquid cooling depending on model 

Noise 



115/230 V~ ±10 %, 50 ... 60 Hz 

Dimensions, weight See type overview and table page 32 

Color: 

Front panel 

Side panels, top 



Electrical safety DIN EN 61010-1 

EMC, CE marking DIN EN 61326-1 

DIN EN 61000-3-2 

DIN EN 61000-3-3 

Warranty 

2 years 

Supplementary technical data for ZSLC (water-cooled) 

Coolant 

Materials in the 

cooling circuit 

Max. coolant 

temperature 

Min. coolant 

temperature 

Water or water-glycol mix 

Copper, Brass, plastic 

12 °C for rated power 

5 °C 

Derating at higher -5 %/°C 

coolant temperature 

Coolant pressure for 

rated power 

Permissible 

operating pressure 

Coolant connection 

min. 3 bar 

max. 5 bar 

½ inch per 8,000 W 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

1) 101 % with 800 V devices 

2) No reverse polarity protection with Zero- 

Volt option 

3) Apart from Zero-Volt option 

ZS512-4 


Software 

GTC 

31


Dimensions ZS, ZSLC, ZSLV Series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

h: Standard: 15 mm 

With option ZS09 

(castors): 

45 mm 

ZS units, air cooled 

Size (H) 2 HU 3 HU 5 HU 8 HU 11 HU 14 HU 17 HU 20 HU 23 HU 26 HU 29 HU 32 HU 35 HU 

H (mm) 89 133 222 355 488 622 755 889 1,022 1,155 1,289 1,422 1,556 

Dimension of terminals when using protective cover 

from 5HU 

2HU 

Software 

ZSLC units, liquid cooled 

In the case of 19“ rack systems, sliding rails are needed due to weight. 

GTC 


32

Our support team never makes you wait


Multichannel Loads, PMLI Series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

 

 

 

 

 

 

 

Configurable multi-channel load 

Up to 12 channels in 19“ -2HU 

Tailored configurations possible with modules in 

3 voltage- and 4 power classes 

150 W - 300 W - 450 W - 600 W modules 

Voltages 60 V - 120 V - 240 V 

Currents from 4.5 A to 80 A 


Configuration 

The PMLI electronic multichannel 

load has up to 12 slots 

for load modules. 

150 W, 300 W, 450 W or 600 W 

load modules are available. 

Depending on power, a module 

occupies one (150 W), two (300 

W), three (450 W) or four slots 

(600 W). 

Configuration 


RS-232 

X 

USB / 

GPIB 

X 

LAN 

O 

System bus 

X 

Analog 

X 

Analog isolated / 


Load Modules 

The modules are available in 

three different voltages 60 V, 

120 V and 240 V and for 

currents of 4.5 A to 80 A. 

Various loads can be 

configured, e.g.: 

1 x 600 W + 1 x 450 W + 2 x 

300 W + 1 x 150 W 

The total power is max. 

1,800 W. 

The loads can therefore be 

easily configured to test units 

 

 

 

 

 

 

 

Dynamic loads 

1,800 W total power 





RS-232 and GPIB interface with software tools 

with multiple outputs. 

The load inputs are galvanically 

separated. 

Very simple systems can 

therefore be specially 

configured to requirements 

with multi-channel Burn-In 

equipment. 

Operating Modes and 

Functions 

The following operating modes 

are possible: 

Current mode 1) 

Voltage mode 2) 

Resistance mode 2) 

Power mode 2) 

Dynamic mode with 2 

presets 

An adjustable trigger voltage 

enables current to flow when 

exceeded. Voltage and current 

measurement functions are 

available. 

Software 

GTC 

Max. 3x4 available modules per device The modules occupy 1-4 slots depending on power E.g 5-channel 3) 

1) Hardware-controlled with fast control 

time 

2) Software-controlled with programmable 

control parameters 

3) Modules with 300 W, 450 W and 600 W 

can only be inserted in the same column 

of slots. 

34


Available Load Modules 

Programming 

Programming takes place in 

SCPI syntax. All channels can be 

addressed individually, jointly or 

in groups. 

Load Modules 

Load modules are available in 

three voltage categories and four 

power classes. 

Load Connections 

The load inputs are connected to 

jack-in terminal strips. All load 

inputs are glavanically separated. 

Analog Measurement Outputs, 

Analog Control Input 

For each load module, analog 

measurement outputs 0 ... 10 V 

for voltage and load current are 

available. 

Via an analog control input the 

load current can be additionally 

set by 0 ... 10 V. 

Cooling 

The air supply from the front 

panel to the back panel enables 

the assembly of compact rack 

systems with no gaps. The 

temperature-controlled fan 

control provides a pleasant 

operating noise. 

Devices and Interfaces 

are available in the following 

versions: 

PMLI-M Master device with 

GPIB + RS-232 interface and 

PMLI system bus for connection 

of up to 8 slave devices. 

PMLI-S Slave device with PMLI 

system bus for operation on a 

master device and with an 

output for a further slave device. 

SLOT4 Empty cooler module 

(without load modules) with 4 

free slots. (1x, 2x or 3x required 

per device depending on 

channels). 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Current LabVIEW ® drivers and 

tools can be downloaded from 

our website. 

PMLI05 Option external LAN- 

RS-232-Adapter 

Software 

www.hoecherl-hackl.com 

GTC 

35


Type Overview 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Model 

order number 

PMLI Software Tools 

TAT Test Automation Tool 

The PMLI Test Automation Tool 

simulates the timed process 

control of several individual 

devices. 

Typical use is to simulate all 

consumers in a vehicle. 

Each channel of the PMLI is 

assigned a device with its typical 

current consumption (windscreen 

wiper, window winder 

etc.). 

There are 10 programmable 

timers for each channel. Test 

routines can be carried out 

individually or in loops. 

M15-06 M15-12 M15-24 M30-06 M30-12 M30-24 M45-06 M45-12 M45-24 M60-06 M60-12 M60-24 

Power 150 W 150 W 150 W 300 W 300 W 300 W 450 W 450 W 450 W 600 W 600 W 600 W 

Voltage 60 V 120 V 240 V 60 V 120 V 240 V 60 V 120 V 240 V 60 V 120 V 240 V 

Current 20 A 10 A 4.5 A 40 A 20 A 9 A 60 A 30 A 13,5 A 80 A 40 A 18 A 

Size 1 Slot 1 Slot 1 Slot 2 Slots 2 Slots 2 Slots 3 Slots 3 Slots 3 Slots 4 Slots 4 Slots 4 Slots 

PMLI Control Tool 

The PMLI Control Tool lets you 

control up to 120 channels in 40 

PMLI devices. 

The tool enables individual 

channel setting, voltage and 

current display and measured 

data recording. 

Simulated consumer 1: 

On 

Off 

Simulated consumer n: 

On 

Off 

Timer 

1 

Timer 

1 

Test cycle start 

Timer 

2 

Timer 

2 

Timer Timer Timer 

3 4 5 

Timer Timer Timer 

3 4 5 

Repeat of test cycle 

Timer 

6 

Timer 

6 

Timer 

7 

Short test cycle 

Timer 

7 

Timer Timer 

8 9 

Timer 

8 

Timer 

9 

Timer 

10 

Timer 

10 

Pre-calculated test cycle time 

Customer application: 

Vehicle simulation 132 channel 

Repeat of test cycle 

GTC 

Software 

36


Technical Data PMLI Series 

Input 

Input voltage 




Current range 

Current rise and fall 

time 1) 


Permissible 

operating voltages 

Load connections 

Sense connections 



Approx. 1 µF / 150 W 

Up to 3 channels can be connected in parallel 


300 µs (10 % ...90 % Inom) 

Vmin 1.4 V at rated current, 

including linear derating of the current 

Negative load input to case: max. 100 V 

Load input to load input: max. 100 V 

Jack-in connections for 4 mm², touch-protected 

(several pins have to be connected for currents 

greater than 20 A) 

available on the Analog I/O Interface 

Protective devices Over-current and power protection 

Over-voltage protection up to 120 % of rated 

voltage 

Reverse polarity protection with diode up to rated 

current 



Rated power Up to TA = 21 °C 




Current ±0.25 % ±0.15 % 

Voltage 

Resistance 

Power 

SW control with adjustable control parameters 

Accuracy depends on accuracy of the measurement 

function for voltage and current and the accuracy of 

the current setting 

Trigger voltage ±1 % ±0.15 % 


settings 

Accuracy of measurement 


value (real value) 

Voltage ±0.2 % ±0.1 % 

Current ±0.25 % ±0.1 % 


measurements 

Sampling rate 300 ms 

Dynamics 

2 programmable 

currents and times 


0 ... 10V for current 


Current ±0.25 % ±0.15 % 

Input resistance >20 kΩ 



0 ... 10 V for current, voltage 



real value 




Minimum load capacity 2kΩ 


Operating 

temperature 

Cooling 

5 °C ... 40 °C 

2-phase air-cooling, temperature-controlled 

Air inlet via the front panel 

Air outlet via the back panel for gap-free 19“ rack 

installation 

Noise 69 dBA (measured from a distance of 1m) 


Dimensions 

Weight 

Color: 

Front panel 


115/230 V~ ±10 %, 50 ... 60 Hz switchable 

Power consumption approx. 90 VA 

19“- 2 HU, 500 x 88 x 390 mm 

(without handles and mounting bracket) 

max. 18.3 kg, depending on equipment 


RAL7037 (stone grey 


EMC, CE marking DIN EN 55011 

DIN EN 61326-1 

DIN EN 61000-3-2 

DIN EN 61000-3-3 

Scope of supply 

Warranty 

Order details 

PMLI-M 

PMLI-S 

SLOT4 

incl. 19“ mounting bracket, RS-232 cable 

2 years 

PMLI Master device with GPIB + RS-232 + PMLI 

system bus interface 

PMLI Slave device with system bus interface for 

connection to Master device and for connection to 

other Slave devices 

Cooler module, empty with 4 slots (depending on 

use, 1x, 2x or 3x required per PMLI device) 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Setting range 


setting 

10 ms .... 60 s 

±2 ms 

Mxx-xx 

PMLI05 

Load module (see type overview, top). 

Unless otherwise indicated the modules are 

mounted in the device in the order specified in the 

Optional external LAN-RS-232 adapter 

Software 

1) Rise and fall times are defined as 10 

% ... 90 % and 90 % ... 10 % of the 




GTC 

37


Electronic AC Loads, ZSAC Series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sinkl 

Accessories 

Software 

RS-232 

USB 

GPIB 

LAN 


System bus 

Analog 


X Standard 

Frequency range up to 700 Hz 

As single phase version and for 3-phase 

Star and delta connection possible 

Input voltages up to 440 V 

Power 400 W ... 21,000 W 

Current and resistance mode 

Programmable waveform 


The AC current loads of the 

ZSAC series feature constant 

current and resistance operating 

modes. 

In AC mode the current is set as 

sinusoidal. In resistance mode 

the height and waveform of the 

current depends on the input 

voltage. 

Voltage Types 

Depending on the type of 

voltage the devices can be 

switched between mains voltage 

and/or mains-synchronous 

voltage, AC voltage with 

variable frequency and DC 

voltage. 

O 

O 

O 

O 

O 

X 

O 

O Option / not available 

ZSAC4226 

Waveforms 

In current mode a lowdistortion 

sinusoidal waveform 

is a permanently saved 

setting. In resistance mode the 

current depends on the 

waveform of the applied input 

voltage. 

Any waveform can be specified 

by programming and saved in 

the retrievable waveform 

memory. 

Functions for harmonics, 

phase-controlled currents and 

currents with adjustable crest 

factor are stored permanently. 

The phase angle adjustment is 

combined with the crest factor 

adjustment. 

Dynamic loads 

Phase angle adjustment combined with crest factor 

Harmonics, phase control 



Isolated measurement outputs for voltage and current 

Isolated analog control input 

Dynamics 

The inbuilt modular enables two 

independently adjustable 

currents and times within the 

range from 100 μs ... 1 s. 

In AC mode the modulator 

serves to adjust the envelope 

curve of the AC current 

(amplitude modulation). 

GTC 

38


ZSAC4226 


Cooling 

All load functions can be The units are air-cooled. To 

controlled remotely via the keep the operating noise low, 

standard Analog I/O Interface . the fans are temperature and 

The control inputs can be current-dependently controlled. 

operated with TTL levels and 24 

V from PLC controllers. 

Mechanics 

Analog Control Input 

The ZS is a sturdy 19“ rack 

In the constant-current 

design and can also be used as 

operating mode the current can 

a table-top device. 

be set by 0 ... 3.5 V or 0 ... 7 V 

DC. 

Analog Measurement 

Outputs 

There are 0 ... 7 V analog 

measurement signals for 


available. The outputs are 


load input. 






Separate installation kits are 


Connections 



designed as touch-protected 

sockets for 4 or 6mm plugs. 

Interfaces (Accessories) 




required. The devices can be 

fitted with the following 

interfaces: 

RS-232 + USB 1) 

(Option ZS01) 

GPIB + RS-232 + USB 1) 

(Option ZS02) 

System interface fiber optic 

(Option ZS05) 

Ethernet-RS-232 converter 

(Option ZS15) 

GTC 


ZSLC 

Water-cooled 

Software 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

39


Data Interfaces (Accessories) 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

If there is an existing RS- 

232 interface (Option ZS01), 

option ZS03 can be upgraded to 

the GPIB interface. Simply 

insert the card. 

Accessories 

Extended function range 

when using an optional data 

interface 

SCPI programming 

Settings with 16 Bit resolution 

Measurement function for 


Measured data memory 

Dynamic load profiles 

Generation of harmonics 

Adjustable crest factor 

Arbitrary programmable 

waveform 

Phase control 

RS-232 + USB Interface 


Option ZS01 adds an RS-232 

and a USB interface (as 

virtual COM Port) to the device. 

Programming is in SCPI. 

(Including 2m RS-232 cable) 




required. 

GPIB + RS-232 + USB 

Interface 


The GPIB interface also includes 

the RS-232 + USB interface 

(Option ZS01). 

(Including 2m RS-232 cable, no 

GPIB cable.) 

Function range by programming 

Settings 

Measurement 

function 

Waveform 

memory 

Load profile 

generator 

Resolution 

Accuracy 

Resolution 

Sampling rate 

Accuracy 

Measured data 

memory 

Resolution 

Functions 

Steps 

Pulse duration 

Ramp time 

Cycling rate 

* Phase shift in terms of apparent power is not possible 

GPIB Interface Expansion 

1) 3) 

(Option ZS03) 


16 Bits 

see technical data 

18 Bits 

ca. 300 ms for V+I 

not synchronized 

see technical data 

Programmable load profile Adjustable crest factor Harmonics generation 

max. 2,000 V/I values 

+ time 

512 points/period 

programmable waveforms 

Crest factor 

Harmonics (3rd to 15th) 

Phase control 

Phase shift * 

max. 50 

200 µs … 2,000 s 

0 … 2,000 s 

once, n times, continuous 

Ethernet-RS-232 Converter 

1) 3) 

(Option ZS15) 



Option ZS01 is needed for this. 

If option ZS01 is already 

available the device can be 

easily upgraded with the ZS15 

option. 

Software 

GTC 



H&H 

3) Requires ZS01or ZS02 

Arbitrary programmable waveform 

Phase control currents 

40


Setting Up Three-Phase Systems 

Fiber Optic System Interface 

(Option ZS05) 

(ZS05-M for Master devices, 

ZS05-S for Slave devices) 

The fibre optic connection is used 

to control three phase systems. 

Including 5m optical cable. 

Option ZS01 or ZS02 required. 

(Including 5m optical cable) 

Wiring of Three-Phase Systems 

Wiring of three-phase 

systems 

Depending on the rated voltage, 

Phase-Phase, Phase-Neutral or 

mixed devices can be wired. The 

control can be either individual, 

in Master-Slave mode or via 

interface. For ease of programming 

we recommend 

connecting both Slave devices to 

the Master device by fiber optic 

interface. The devices can then 

be programmed jointly or 

individually. 


1) 3) 


(Option ZS07) 






inputs (5 V ... 24 V, shared 

GND) can be queried. 

The inputs and outputs are 

isolated from the load input. The 

isolation voltage is 500 V DC 

with respect to the negative load 

input. 

Phase-Neutral connection (260 V Version) 

Castors 1) 

(Option ZS09) 






devices from 5HU and is suitable 

only for hard floors. 

Calibration 


Certificate 2) 

(Option FCC-ZSACxx) 



devices. 








system (SI). 





Order example for a three-phase system: 

Master with RS-232 interface 

Slaves connected to the master with fiber optic 

sytem interface: 

Load 1+ZS01+ZS05-M, 



Phase-Phase connection (440 V Version) 



H&H 

3) Requires ZS01or ZS02 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

41




ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Basic Communication Tool 

The Basic Communication Tool 

can be used to send any 

commands for test purposes and 

for commissioning of test systems. 

Accessories 

The following SW tools and 

drivers are delivered as 

standard with the interfaces: 

Load Control 

Individual devices and multichannel 

systems can be 

controlled via the tool. 

The range of functions includes 

PC device set-up, data logging 

with graphical display and 

saving data for other programs. 

Data Acquisition 

As well as device control, 

measured data can be logged 

and saved. 

The following measured values 

are saved: 

Time, voltage, current. 


The Waveform Editor permits 

the intelligent generation of 

load profiles in the form of 

straight sections. The load 

trajectory is displayed on entry. 

The profiles can be saved. 

Harmonics 

Portions of harmonics up to 8th 

can be added to the basic 

frequency. 

Phase Control 

Phase-controlled currents with 

phase angles of 0 ... 180° can 

be set. 

Driver 

Software 

Current LabVIEW drivers are available from: 

http://www.hoecherl-hackl.com/ 

or 

http://www.ni.com/downloads/instrumentdrivers/d/ 

GTC 

42


400 W ... 21,000 W AC 

Model (order number ZSAC426 ZSAC444 ZSAC1426 ZSAC1444 ZSAC2826 ZSAC2844 

Voltage 

6 ... 260 V AC 

6 ... 360 V DC 

10 ... 440 V AC 

10 ... 660 V DC 

6 ... 260 V AC 

6 ... 360 V DC 

10 ... 440 V AC 

10 ... 660 V DC 

6 ... 260 V AC 

6 ... 360 V DC 

10 ... 440 V AC 

10 ... 660 V DC 

Current 6 A 3 A 10 A 5 A 20 A 10 A 

Power 400 W 400 W 1,400 W 1,400 W 2,800 W 2,800 W 

Resistance 2 ... 2,000 Ω 3 ... 6,666 Ω 1 ... 1,200 Ω 2 ... 4,000 Ω 0,5 ... 600 Ω 1 ... 2,000 Ω 

Connection 1) SB4 SB4 SB4 SB4 SB6 SB4 





Model (order number ZSAC4226 ZSAC4244 ZSAC5626 ZSAC5644 ZSAC7026 ZSAC7044 

Voltage 

6 ... 260 V AC 

6 ... 360 V DC 

10 ... 440 V AC 

10 ... 660 V DC 

6 ... 260 V AC 

6 ... 360 V DC 

10 ... 440 V AC 

10 ... 660 V DC 

6 ... 260 V AC 

6 ... 360 V DC 

10 ... 440 V AC 

10 ... 660 V DC 


Power 4,200 W 4,200 W 5,600 W 5,600 W 7,000 W 7,000 W 

Resistance 0.33 ... 400 Ω 0.7 ... 1,333 Ω 0.25 ... 300 Ω 0.5 ... 1,000 Ω 0.2 ... 240 Ω 0.4 ... 800 Ω 






Model (order number ZSACRV8426 ZSAC8444 ZSACRV9826 ZSAC9844 ZSACRV11226 ZSAC11244 

Voltage 

50 ... 260 V AC 

50 ... 360V DC 

10 ... 440 V AC 

10 ... 660 V DC 

50 ... 260 V AC 

50 ... 360V DC 

10 ... 440 V AC 

10 ... 660 V DC 

50 ... 260 V AC 

50 ... 360V DC 

10 ... 440 V AC 

10 ... 660 V DC 


Power 8,400 W 8,400 W 9,800 W 9,800 W 11,200 W 11,200 W 

Resistance 0.84 ... 200 Ω 0.33 ... 666 Ω 0.72 ... 171 Ω 0.3 ... 570 Ω 0.63 ... 150 Ω 0.25 ... 500 Ω 






Model (order number ZSACRV12626 ZSAC12644 ZSACRV14026 ZSAC14044 ZSACRV15444 ZSACRV16844 

Voltage 

50 ... 260 V AC 

50 ... 360V DC 

10 ... 440 V AC 

10 ... 660 V DC 

50 ... 260 V AC 

50 ... 360V DC 

10 ... 440 V AC 

10 ... 660 V DC 

50 ... 440 V AC 

50 ... 660 V DC 

50 ... 440 V AC 

50 ... 660 V DC 


Power 12,600 W 12,600 W 14,000 W 14,000 W 15,400 W 16,800 W 

Resistance 0.56 ... 133 Ω 0.22 ... 444 Ω 0.5 ... 120 Ω 0.2 ... 400 Ω 0.91 ... 363 Ω 0.84 ... 333 Ω 


Power consumption 580 VA 1.150 VA 640 VA 980 VA 695 VA 735 VA 




Model (order number ZSACRV18244 ZSACRV19644 ZSACRV21044 

Voltage 

50 ... 440 V AC 50 ... 440 V AC 50 ... 440 V AC 

50 ... 660 V DC 50 ... 660 V DC 50 ... 660 V DC 

Current 65 A 70 A 75 A 

Power 18,200 W 19,600 W 21,000 W 

Resistance 0.77 ... 307 Ω 0.72 ... 285 Ω 0.67 ... 266 Ω 

Connection 1) SB6 SB6 SB6 

Power consumption 805 VA 875 VA 900 VA 

Noise max. 2) 78 dB(A) 78 dB(A) 79 dB(A) 

Weight 116 kg 123 kg 130 kg 

Housing 3) 19“ - 17 HU 19“ - 17 HU 19“ - 17 HU 

1) SB4: 4mm safety socket 

SB6: 6mm safety socket (also fits 

4mm jack) 

2) Measured on the front panel from 

distance 1m 

3) 1 HU = 44.45 mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

43



ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Acessories 

Technical Data ZSAC, ZSACRV Series 

Accuracy of manual setting, no preset function 1) 

Current 

DC 

400Hz 


±0.5 % 

±1 % 

Accuracy of manual setting via preset function 1) 

Current DC, 50 Hz 

400 Hz 

Resistist. DC, 50 Hz 

400 Hz 


±0.9 % 

±1.4 % 

±1.9 % 

±3.4 % 


±0.3 % 

±0.6 % 


±0.3 % 

±0.6 % 


±1 % of current range 

Total Harmonic distortion 2) 

50 Hz 1 % at rated current 

400 Hz 5 % at rated current 




Voltage DC, 50 Hz 

400 Hz 

±0.3 % 

±0.6 % 

±0.1 % ±1 digit 

±0.2 % ±1 digit 

Current 

DC, 50 Hz 

400 Hz 

±0.5 % 

±1 % 

Accuracy analog control 

0 ... 3.5 V / 0 ... 7 V for current 


Current 

DC, 50 Hz 

400 Hz 

±0.5 % 

±1 % 

Input resistance of analog inputs >10kΩ 


0 ... 7 V for current, voltage, 0 ... 5 V for power 


real value 

Voltage 

Current 

Power 

DC, 50 Hz 

400 Hz 

DC, 50 Hz 

400 Hz 

DC, 50 Hz 

400 Hz 

±0.5 % 

±1 % 

±0.5 % 

±1 % 

±2 % 

±4 % 

±0.3 % ±1 digit 

±0.6 % ±1 digit 


±0.3 % 

±0.6 % 


±15 mV 

±30 mV 

±15 mV 

±30 mV 

±30 mV 

±60 mV 

GND electrically isolated from load input, max. ±500 V with respect to negative 

load input 

Input 

Frequency range 





ZSAC 

ZSACRV 

Permissible 


Protective devices 

DC, 40 Hz ... 700 Hz 

DC: >50 kΩ when load input is off 

approx. 1.5 µF / 1,400 W 





Negative load input - case 

125 V DC 


Over-current and over-power protection 

Over-voltage protection up to 120% of rated voltage 1) 





Programming via data interface 1) 

Current 

DC 

400 Hz 

Resistance DC 

400 Hz 

Resolution setting 


±0.5 % 

±1 % 

±1.5 % 

±3 % 


±0.3 % 

±0.6 % 


±1 % of current range 

16 Bit 

Accuracy of reading, read out via data interface 

Voltage 

Current 

DC 

400 Hz 

DC 

400 Hz 

Resolution of 

measurement 

Sampling rate 


functions 

Dynamics 

2 currents and 2 

times can be set 

independently 



±0.5 % 

±1 % 

±0.5 % 

±1 % 

330 ms, not triggerable 

Load on - off 




18 Bit 

±0.05 % 

±0.1 % 

±0.05 % 

±0.1 % 

Time ranges 100 ms 1000 ms 


setting 



±1.4 % 

Operating temperature 5 °C ... 40 °C 

Cooling 

Noise 


Dimensions, 

Weight 

Color: 

Front panel 


Variable controlled fans 


115/230 V~ ±10 %, 50 ... 60 Hz 

See type overview and table page 43 




EMC, CE marking DIN EN 61326-1 

DIN EN 61000-3-2 

DIN EN 61000-3-3 

Warranty 

2 years 


±0.5 % 

Software 

GTC 

1) The accuracy applies for the specified 

frequencies. 

At higher frequencies the accuracy 

decreases. 

2) The Total Harmonic Distortion increases 

at lower currents. 


44

We´re going all out for electricity! 

H&H employees with electric car



ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Source-Sink, NL Series 

RS-232 

USB 

GPIB 

LAN 


System bus 

Analog 


X Standard 

2-quadrant or 4-quadrant versions 

Source-sink function 

Rapid control time 

Current and voltage mode 

Adjustable limitations 


Analog control inputs 


The NL source-sinks can 

operate in constant voltage or 

constant current mode. 

In voltage mode there are two 

current limiters (source current 

and sink current) which can be 

adjusted independently of one 

another. In current mode, an 

upper and a lower limit voltage 

can be set. 

X 

X 

O 

O 

O 

X 

O 

O Option / not available 

NL1V20C40 

Source-sink Mode 

Depending on the preset output 

value and the characteristics of 

the connected test unit, the 

device automatically decides 

whether to operate as a source 

or a sink. Switching from source 

to sink mode is very rapid. 

USB + RS-232 interface 

Programmable waveform 


Software tools for battery testing 

2-Quadrant /4-Quadrant 

Mode 

Devices for two-quadrant mode 

can supply or receive current 

with a positive output voltage. 

To guarantee the required 

function in the case of settings 

close to 0 V and long connection 

leads, the 2-quadrant devices 

start to operate from an output 

voltage of -1 V. 

The 2-quadrant devices therefore 

also act as 4-quadrant 

devices but with limited 

negative voltage. 

4-quadrant devices can be set 

by high negative values as well 

as positive values. 

Software 

GTC 

2-quadrant mode 

4-quadrant mode 

46



All source-sink functions can be 

controlled remotely via the 

standard Analog I/O Interface. 

Operating mode selection, 

output on - off and adjustment 

of control speed can be set with 

logic levels. A version (NL06) 

which is electrically isolated 

from the output is optionally 

available. 

3 Analog Control Inputs 

Depending on the selected 

operating mode the output 

voltage or output current can be 

preset to a control voltage 0 ... 

±5 V or 0 ... ±10 V DC. There 

are two further analog inputs 

available to limit the voltage or 

current. 

Function Range for 

Programming 

Programming in SCPI Syntax 

Programmable voltage and 

current profiles 

Dynamic mode with adjustable 

rise and fall time 

NL1V44C22 

2 Analog Measurement 

Outputs 

For voltage and current there 

are 0...10 V analog 

measurement signals available. 

The signals follow the curve 

trajectory. 

Cooling 

The units are air-cooled. To 

keep the operating noise low, 

the fans are temperature and 

current-dependently controlled. 

Mechanics 

The NL series is a sturdy 19“ 

rack design and can also be 

installed in a cabinet or act as a 

table-top device. 






Separate installation kits are not 


Connections 



pole terminals or solid copper 

rails with screw terminals. 

4mm plugs, forked cable lugs 

and stripped cables can be 

used. 

Safety 

Covers are available for outputs 

as contact protection for units 

for dangerous contact voltages . 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Measured data memory 

Trigger functions 

Use of supplied software and 

LabVIEW driver 

Software 

Data logging with constant scanning rate 

GTC 

47




ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessori 

es 

GPIB Interface Expansion 1) 

(Option ZS03) 

With the ZS03 option the device 

can be expanded by a GPIB 

interface. 

Simply insert the card. 


1) 3) 4) 

Temperature Interface 

(Option ZS16) 

With the temperature interface 

card temperatures from 0...100 

°C are captured by a NiCr-Ni 

(Type K) sensor and transformed 

into a 0 ...1 0 VDC 

analog voltage. This analog 

voltage can be fed to the analog 

control input of the Analog I/O 

interface and read out via the 

data interface. 

Data Acquisition Tool 

(Option NL13) 2,3) 

The Data Acquisition Tool adds 

the following functions to the 

range of the device: 

Fast synchronized data 

logging for waveform 

generation with data 

memory 

Exponential inrush 

processes 

1) 3) 

Ethernet-RS-232 

Converter (Option ZS15) 



Castors 1) 

(Option ZS09) 






devices from 5HU and is 

suitable only for hard floors. 

Electrically Isolated Analog 

interface 1) (Option NL06) 

In the case of potential 

differences between the negative 

load input and the signals 

on the Analog I/O Interface the 

standard Analog I/O card can be 

replaced with an isolated 

version. All measurement and 

control signals are transmitted 

via isolation amplifiers and optocouplers. 

The card is pincompatible 

with the standard 

Analog I/O card. The isolation 

voltage is 500 V DC with respect 

to the negative load input. 

Converter 

(in addition to 18 Bit 

standard A/D 

converter) 

Sampling rate, 

Synchronization 

Measured data 

memory 

1) 3) 


(Option ZS07) 






inputs (5V ... 24V, shared GND) 

can be queried. 

The inputs and outputs are 

isolated from the load input. The 

isolation voltage is 500 V DC 

with respect to the negative 

load input. 

Fast A/D converter 13 Bit, 

measures voltage and 

current simultaneously 

min 200 μs, can be 

programmed separately for 

each wave section and 

synchronised with 

waveform generator 

2,000 V/I value pairs with 

timestamp 

Software 

GTC 

Battery capacity test 

MPP Tracking for solar panel 

test 

Synchronized data logging with variable scanning rate 

for waveform. Simultaneous measurement of voltage 

and current. 

1) Can be retrofitted at any time. 


H&H. 

3) Requires ZS01 oder ZS02 

4) Requires Option NL13 

48


Calibration 


Certificate 

(Option FCC-NLxx) 1) 



devices. 








system (SI). 






Control Tool 

(Universal Control Program) 

Tool supplied as standard can 

be used to control single device. 

Scope of functions: 

Device settings 

Data logging with 

numerical display 

Trigger source selection 

Activation of cut-off 

criteria 

Data logging 

Dynamic List and Data 

Acquisition Tool 

The Tool Dynamic List 

permits the intelligent 

generation of profiles in the 

form of straight sections. 

The wave trajectory can be 

graphically displayed before 

testing. 

The profiles set can be stored 

and re-activated when 

1) Can only be produced by H&H. 

needed. 

If the NL13 option is 

installed, fast synchronous 

data logging can be carried 

out for the programmed wave 

trajectory. The measurement 

points can be imported 

directly after the end of the 

measurement. 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

(the FCC is more economical if ordered 

together with a new device) 

GTC 

49




ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

Accessories 

Battery Test Tool 

Charging 

Discharging 

Cycling 

Capacity determination 

Logging 

Cut-off criteria 

Dynamic test 

The Battery Test Tool enables 

the testing of the most diverse 

energy storage units to be 

tested with the NL series. 

Different storage types and 

their technical data can be 

1) 

2) 

saved in a library. 1) 

At the end of charging or 

discharging phases there are 

different monitoring criteria. 

Current 

Time 

Capacity 

-dV/Cell 

External event 

(Option ZS07 required) 2) 

To test the DUT for specific 

requirement it is possible to 

apply a predefined waveform. 

The most important current test 

information is available at a 

glance. 

A report can be produced for 

documentation of the test. 

The time resolution can be 

adjusted from 300 ms onwards. 

The data can be backed up to a 

text file for further processing, 

e.g. with MS Excel. 

The following are logged: 

Voltage 

Current 

Time 

Capacity 

Status 

Test conditions 

Switch-off criteria 

GTC 

Software 

NL 

Source-Sink 

50


Type Overview of Unipolar Devices 

Models up to 10 kW 

on request 

Model (order number) NL1V10C20 NL1V20C10 NL1V30C8 NL1V42C6 NL1V80C3 NL1V100C2 

Voltage -1 V ... +10 V -1 V ... +20 V -1 V ... +30 V -1 V ... +42 V -1 V ... +80 V -1 V ... +100 V 

Current ±20 A ±10 A ±8 A ±6 A ±3 A ±2 A 

Power 200 W 200 W 240 W 252 W 240 W 200 W 

Rise/ Current 200 µs 200 µs 200 µs 200 µs 200 µs 200 µs 

fall time 1) Voltage 200 µs 200 µs 200 µs 200 µs 200 µs 200 µs 

Connection 2) PK4 PK4 PK4 PK4 PK4 PK4 


Mains supply 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 

W x H x D (mm) 3) 483 x 88 x 520 483 x 88 x 520 483 x 88 x 520 483 x 88 x 520 483 x 88 x 520 483 x 88 x 520 






Power 640 W 600 W 800 W 832 W 968 W 880 W 

Rise/ Current 200 µs 200 µs 200 µs 200 µs 200 µs 200 µs 


Connection 2) FK25 PK60 PK60 BM8 BM8 BM8 

Power consumption 1,400 VA 1,325 VA 1,400 VA 1,300 VA 1,400 VA 1,255 VA 

Mains supply 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 




NL1V200C4 

-1 V ... +200 V 

±4 A 

800 W 

400 µs 

400 µs 

SB4 

1,000 VA 

115/230 VAC 

483 x 132 x 520 

35 kg 

19“ - 3 HU 

NL1V400C2 

-1 V ... +400 V 

±2 A 

800 W 

400 µs 

400 µs 

SB4 

1,000 VA 

115/230 VAC 

483 x 132 x 520 

35 kg 

19“ - 3 HU 




Power 1,280 W 1,200 W 1,600 W 1,560 W 1,760 W 1,600 W 

Rise/ 

Current 200 µs 200 µs 200 µs 200 µs 200 µs 200 µs 


Connection 2) FK25 FK25 FK25 PK60 PK60 PK60 


Mains supply 230 VAC 230 VAC 230 VAC 230 VAC 230 VAC 230 VAC 







Power 1,920 W 1,800 W 2,400 W 2,340 W 2,640 W 2,400 W 

Rise/ 



Connection 2) FK25 FK25 FK25 FK25 FK25 FK25 


Mains supply 230/400 VAC—16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 







Power 2,560 W 2,400 W 3,200 W 3,120 W 3,520 W 3,200 W 

Rise/ 



Connection 2) FK25 FK25 FK25 FK25 FK25 FK25 


Mains supply 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 230/400 VAC - 16 A 




1) Measured at short-circuited output 

terminals (current) and open output 

terminals (voltage). Tolerance ±20 % 


4 mm hole and M10 and M12 

screw fastenings 

PK4: 

BM8: 

PK60: 

4mm pole terminals 

M8 screw fitting 

Pole terminals for forked cable 

lug and 4mm jack 

3) 19“ rack installation, approx. 100 mm 

should be added to installation depth 

for rear cable connections. 

The weight of the devices means that 

sliding rails must be used for 19“rack 

installation. 

4) 1 HU = 44.45 mm 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

51


Type Overview of Bipolar Devices 

Models up to 10 kW 

on request 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accesories 

Software 

GTC 

Model (order number) NL10V10C10 NL20V20C5 NL30V30C3.5 NL50V50C2 

Voltage ±10 V ±20 V ±30 V ±50 V 

Current ±10 A ±5 A ±3,5 A ±2 A 

Power 100 W 100 W 105 W 100 W 

Rise/ 

Current 200 µs 200 µs 200 µs 200 µs 

fall time 1) Voltage 200 µs 200 µs 200 µs 200 µs 

Connection 2) PK4 PK4 PK4 PK4 


Mains supply 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 

W x H x D (mm) 3) 483 x 88 x 520 483 x 88 x 520 483 x 88 x 520 483 x 88 x 520 



Model (order number) NL8V8C46 NL10V10C38 NL20V20C24 NL30V30C16 NL44V44C11 

Voltage ±8 V ±10 V ±20 V ±30 V ±44 V 

Current ±46 A ±38 A ±24 A ±16 A ±11 A 

Power 368 W 380 W 480 W 432 W 484 W 

Rise/ 

Current 200 µs 200 µs 200 µs 200 µs 200 µs 

fall time 1) Voltage 200 µs 200 µs 200 µs 200 µs 200 µs 

Connection 2) BM8 BM8 BM8 BM8 BM8 


Mains supply 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 

W x H x D (mm) 3) 483 x 132 x 520 483 x 132 x 520 483 x 132 x 520 483 x 132 x 520 483 x 132 x 520 



NL100V100C4 

±100 V 

±4 A 

400 W 

400 µs 

400 µs 

SB4 

600 VA 

115/230 VAC 

483 x 132 x 520 

35 kg 

19“ - 3 HU 

NL200V200C2 

±200 V 

±2 A 

400 W 

400 µs 

400 µs 

SB4 

600 VA 

115/230 VAC 

483 x 132 x 520 

35 kg 

19“ - 3 HU 


Voltage ±8 V ±10 V ±20 V ±30 V ±44 V 

Current ±80 A ±60 A ±40 A ±32 A ±20 A 

Power 640 W 600 W 800 W 960 W 880 W 

Rise/ 



Connection 2) FK25 PK60 PK60 PK60 PK60 


Mains supply 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 115/230 VAC 





Voltage ±8 V ±10 V ±20 V ±30 V ±44 V 

Current ±120 A ±90 A ±60 A ±48 A ±30 A 

Power 960 W 900 W 1,200 W 1,440 W 1,320 W 

Rise/ Current 200 µs 200 µs 200 µs 200 µs 200 µs 


Connection 2) FK25 FK25 FK25 FK25 FK25 


Mains supply 230 VAC 230 VAC 230 VAC 230 VAC 230 VAC 





Voltage ±8 V ±10 V ±20 V ±30 V ±44 V 

Current ±160 A ±120 A ±80 A ±64 A ±40 A 

Power 1,280 W 1,200 W 1,600 W 1,920 W 1,760 W 

Rise/ 



Connection 2) FK25 FK25 FK25 FK25 FK25 


Mains supply 230 VAC 230 VAC 230 VAC 230 VAC 230 VAC 




1) Measured at short-circuited output 

terminals (current) and open output 

terminals (voltage). Tolerance ±20 % 


4 mm hole and M10 and M12 

screw fastenings 

PK4: 

BM8: 

PK60: 

cable 

4mm pole terminals 

M8 screw fitting 

Pole terminals for forked 

lug and 4mm jack 

3) 19“ rack installation, approx. 100 mm 

should be added to installation depth 

for rear cable connections. 

The weight of the devices means that 

sliding rails must be used for 19“rack 

installation. 

4) 1 HU = 44.1 HE = 44,45 mm 

52


Dimensions 

h: Standard: 15 mm 

Mit ZS09 option 

(castors): 

45 mm 

Size 2 HU 3 HU 5 HU 8 HU 11 HU 14 HU 

H (mm) 88 133 222 355 488 622 

Dimension of terminals when using protective cover 

NL device with FK25 connections 


ZSLC 

Water-cooled 

PMLI 

Multi-channel 

ZSAC 

AC 

Accessories 

In the case of 19“ rack systems, sliding rails are needed due to weight. 

GTC 

Software 

ZSLV 

Low Voltage 

NL 

Source-Sink 

53


Technical data NL series 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 



Voltage ±0.1 % ±0.05 % 

Current ±0.2 % ±0.05 % 

Voltage protection ±0.1 % ±0.05 % 

Current protection ±0.2 % ±0.05 % 

Resolution of setting 16 Bits 

Ripple 

0.05 % RMS from range 

Load Effect 0-100 % 0.1 % 

Line Effect ±10 % 0.02 % 




Voltage ±0.1 % ±0.05 % ±1 digit 

Current ±0.2 % ±0.05 % ±1 digit 

Resistance 

Quotient of voltage and current 

Power 

Product of voltage and current 

Accuracy analog control 

-5 V ... 0 ... +5 V / -10 V ... 0 ... +10 V for current, voltage 


Voltage ±0.2 % ±0.15 % 

Current ±0.4 % ±0.15 % 

Voltage protection * 

(upper and lower) 

±0.2 % ±0.15 % 

Current protection * 

±0.4 % ±0.15 % 

(upper and lower) 

* –10 V ... 0 ... +10 V only 

Input resistance of analog inputs >10 kΩ 




Offset voltage 

real value 



GND max. ±2 V with respect to negative output 1) 

Minimum load capacity 2kΩ 

Output 




Permissible 


with option NL06 

>50 kΩ in standby 

approx. 1.5 µF / 1,400 W 


(hardware-controlled only in current mode) 

negative input - case: ±125 V DC 

GND Analog I/O interface - neg. output: ±2 V DC 

GND Analog I/O interface - neg. output: ±125 V DC 

Protective devices Over-current and over-power protection 



Derating -1.2 %/°C for TA > 21 °C 


functions 

Standby 

Operating mode change 



Accuracy of measurement 



Voltage ±0.1 % ±0.05 % 

Current ±0.2 % ±0.05 % 

Resolution 

18 bits 

Sampling rate 330 ms, not triggerable 

(not synchronized) 

Accuracy of measurement with Data Acquisition Tool (Option NL13), 

read out via data interface 



Voltage ±0.15 % ±0.07 % 

Current ±0.3 % ±0.07 % 

Resolution 

13 bits 

Sampling rate 

(programmable) 

minimal 200 µs (in memory) 

triggerable 


Operating 

5 °C ... 40 °C 

temperature 

Cooling 

Current and temperature-controlled fans 

(airflow from front panel to back panel) 

Noise 

see type overview 

Supply voltage 115/230 V~ ±10 %, 50 ... 60 Hz 

230/400 V AC - 16 A CEE 2) 

Dimensions, weight see type overview and table, page 51/52 

Color: 

Front panel 

side panels, top 




EMC, CE mark DIN EN 61326-1 

DIN EN 61000-3-2 

DIN EN 61000-3-3 

Measuring 

CAT I 

instrument category 

Warranty 

2 years 

Software 

GTC 

1) ±125 V with NL06 option 

2) Class C protective equipment 

recommended due to high switch-on 

currents 


54


High Current Cables 

High Current Cables 

(Standard) 

Highly flexible cables in different 

lengths, cross-sections and 

voltage strengths with cable 

lug. 

Standard HKS cable in different cross sections 

High current cables 

(low induction) 

For dynamic load with high rise 

times and for long load lines. 

These double cables enable the 

voltage of the test unit to be 

supplied to the load input with 

Low induction high current HKI cables 

1) The specified values for L and R relate to 

two parallel cables leading to the test 

unit. 

Color coding via cable lug. 

Two leads are always required 

for device connection. 

Several cables can be connected 

in parallel for higher currents. 

very low inductive losses. 

Only in this way it is possible to 

realize fast current rise times. 

The maximum voltage is 300V. 

Type 

(mm²) 

(A) 

Accessories 

(V) 

L 1) 

(µH 

/m) 

R 1) 

(mΩ 

/m) 

HKS16-l-rt/sw 16 120 100 0.64 3.02 Ø 10 

HKS25-l-rt/sw 25 160 100 0.64 2.15 Ø 12 

HKS35-l-rt/sw 35 200 100 0.62 1.54 Ø 12 

HKS50-l-rt/sw 50 250 100 0.61 1.00 Ø 12 

HKS70-l-rt/sw 70 300 100 0.52 0.68 Ø 12 

HKS95-l-rt/sw 95 365 100 0.55 0.50 Ø 12 

HKS120-l-rt/sw 120 450 100 0.44 0.37 Ø 12 

HKM70-l-rt/sw 70 260 450 0.52 0.68 Ø 12 

HKM240-l-rtlsw 240 750 450 0.50 0.22 Ø 16 

HKV16-l-rt/sw 16 100 1,500 0.64 3.02 Ø 10 

HKV70-l-rt/sw 70 250 1,500 0.52 0.68 Ø 12 

Dielectric strength: 

HKS cable: 100V 

HKM cable: 450V 

HKV cable: 1,500V 

Order examples: HKS16-2-rt: 16 mm², l=2 meters, red 

HKS50-1-sw: 50 mm², l=1 meter, black 

Type 

Order example: HKI30-3: 30 mm², l=3 meters 

Comparison: 

Standard cable - low inductance cable 

Voltage source 5 V, load variation 0 to 100 A 

L 

mm 

(µH/ (mΩ/ 

(mm²) 

(A) (V) m) m) mm 

HKI12-l 2x12 80 300 0.065 3.79 Ø 10 

HKI30-l 2x30 130 300 0.065 1.82 Ø 12 

HKI70-l 3x70 250 300 0.081 0.68 Ø 12 

R 

Voltage and current diagram 

with 2 m standard cable HKS35, 

slack. Voltage drops as current 

on cable increases. 

The cable determines the 

maximum rise speed of the 

current. 

Voltage and current diagram 

with 2 m low-induction cable 

HKI30. The voltage remains 

stable while the current 

increases at the load input. 

The actual control behaviour of 

the test unit can be analyzed. 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

GTC 

Crosssection 

Current 

Connection 

Voltage 

Crosssection 

Current 

Voltage 

Connection 

Accessories 

Software 

55


Accessories 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

HKV16/CON High Current 

Cable (for ZSAC Series ) 

The HKV16/CON high-current 

cables are manufactured with a 

SB6 jack at one end which fits 

the electronic ZSAC loads with 

SB6 connections. 

The other end is unassembled. 

Type 

Master-Slave Cable 

Order no.: K-MS-ZS 

For Master-Slave operation of 

two devices. Length: 2m 

1 set HKV16 cable (red and 

black), 2 m long, included as 

standard with all loads with 

SB6 connection. 

Order examples: 

HKV16/CON-2-rt: 16mm², l=2 meters, red 

HKV16/CON-6-sw: 16mm², l=6 meters, black 

Cross section 

(mm²) 

RS-232 Cable 

Current 

(A) 

Order no.: K-RS-SNM9-9 

Null modem cable (RTS-CTShandshake) 

Length: 2m 

HKV16/CON high current cable for ZSAC series with SB6 socket 

Voltage 

(V) 

Inductance 1) 

(µH/m) 

Resistance 1) 

(mΩ/m) 

Connection 

HKV16/CON-l-(rt/sw) 16 100 600 0.64 

3.02 SB6 

Other Cables 

Coolant Distribution for ZSLC Loads 

We supply the coolant 

distributors to match the 

configuration of your loads. 

Manuals 

Extra Manual: 

German + English: 

Order no.: HB-XXXX 2) 

Software 

GTC 

1) The specified values for resistance 

and inductivity relate to two 

parallel cables leading to the test 

unit 

2) XXXX = model name 

56


19“ Racks 

19“Racks for the Installation 

of Electronic Loads 

The installation of electronic 

loads requires special racks 

which are designed for adequate 

air outlet of the heated exhaust 

air. 

H&H racks are fitted at the back 

Model 

Installation 

height 

front (HU) 

with large scale air vents to 

allow exhaust air to escape 

practically unhindered. 

The rear door is shorter to 

accommodate the connection 

cable. 

The installation 

680 mm. 

Air outlet 

rear (HU) 

Height 

(mm) 

Rack 34 34 27 1,710 

Rack 38 38 32 1,910 

Rack 43 43 36 2,110 

Rack 47 47 41 2,310 

The connection cable is guided 

through flexible foam rubber 

lips. 

A socket strip near the floor is 

provided for mains connection of 

devices. 

depth is 

Mains Switches for Rack Installation 

Model Voltage Current Switches 

SE-1PH 1~230 V 16 A 

SE-3PH-16 3~230/400 V 16 A 

SE-3PH-32 3~230/400 V 32 A 

SE-3PH-DC 3~230/400 V 32 A 

SE-3PH-FI 3~230/400 V 16 A 

Central emergencyoff 

switch 


switch 


switch 


switch 


switch 

19“ rack for electronic loads 

RCCB 

- 

- 

30 mA 

30 mA 

Connection 

Terminal 

Terminal 

2x16 A CEE 

3x safety sockets 

1x16 A CEE 

3x safety sockets 

Accessories 

Miscellaneous 

- 

- 

DC power supply 

12 V/8 A 

- 

Height 

2 HU 

2 HU 

- Terminal - 2 HU 

3 HU 

3 HU 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

Accessories 

SE-3PH-FI SE-3PH-16 SE-3PH-DC 

GTC 

NL 

Source-Sink 

Software 

57



ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

H&H Application Note #1 

Source-sink with power supply and H&H ZS Electronic Load 

Function 

A source-sink which can both 

supply and consume current can 

be constructed from a power 

supply and an H&H ZS series 

electronic load. 

Applications 

Testing rechargeable batteries, 

capacitors, etc. 

Measurement Setup 

The power supply and the 

electronic load are controlled in 

constant current mode and viceversa. 

If the power supply is off, the 

electronic load is actuated and 

vice-versa. 

This is either programmed or via 

an analog control. 

Wiring 

H&H offers no guarantee for the function of 

the suggested applications. 

H&H offers no guarantee for damage resulting 

from such applications. 

Analog Control 

For analog control the control 

inputs of the electronic load 

and the power supply are 

connected in parallel. 

The control input of the 

electronic load is connected 

with polarity reversed. 

If the control signal is positive 

the power supply works as a 

current source and delivers the 

I source current to the test unit. 

If the control signal is negative 

the electronic load is activated 

and consumes the I sink 

current. 

Note that the power supply is 

not sensitive to negative 

control voltages at the analog 

control input. 

Example: 

Power supply Delta Elektronika 

SM15-200D (15 V/200 A) 

Electronic Load ZS4206 

(60 V/450 A) 

Settings: 

Source current: 27 A, 

Sink current: 23 A, 

DUT: Lead battery 

6 V /140 Ah 

Battery test 

For battery testing the voltage 

setting on the power supply can 

be used to set the charging 

voltage. 

The trigger voltage for the ZS 

electronic load can be used to 

set the discharge voltage. 

The function is tested with an 

H&H ZS series Electronic Load 

and a Delta Elektronika power 

supply. 

Scaling 

If the power supply and the 

electronic load have different 

current ranges, this should be 

taken into account in the control 

voltage value. 

Only when the power supply and 

the electronic load have the 

same current range and require 

the same control voltage the 

Control 

Current waveform 

same current is also set with 

the same control voltage in 

reverse polarity. 

Dynamics 

The possible dynamics depend 

primarily on the control speed of 

the power supply. 

58



Loading of small voltages with the help of an external power supply 

Function 

An external power supply can be 

used as a substitute for the 

Zero-Volt option. 

The operating range of the 

electronic load can then be used 

for very small voltages which 

are otherwise not loaded due to 

the minimum input voltage of 

the devices. In addition, voltage 

drops on the power cables can 

be compensated. 

Applications 

Loading of single battery 

cells 

Testing of fuel cells 

Recording characteristics 

down to zero volts 

Wiring 

Measurement Set-Up 

The power supply is connected 

to the test unit in series as 

shown in the wiring diagram. 

To maintain the correct 

voltage display on the 

electronic load the sense 

lines are fed directly to the 

test unit´s output terminals. 

This is required to ensure 

accurate voltage detection so 

that the electronic load makes 

the correct settings in 

constant voltage, constant 

resistance and constant power 

operating modes. 

Furthermore, the reverse 

polarity protection of the test 

unit is thereby guaranteed by 

the power supply. 

Requirements of the Power 

Supply 

The voltage of the power supply 

unit must not exceed approx. 3V 

and it must be able to deliver 

the maximum load current. 

Interferences on the power 

supply output voltage also occur 

in the load current. 

Power Reduction 

As the electronic load in the 

stated configuration does not 

measure the added voltage on 

the external power supply, any 

consequential additional power 

is also not taken into account. 

Note that the load capacity of 

the electronic load is thereby 

reduced by: 

Power supply voltage 

x set load current 

The power delivered by the 

Operating range 

Notes 

external power supply cannot be 

measured by the power 

protection of the electronic load. 

Settings on the Electronic 

Load 

To operate with reduced input 

voltage the "Limit" function 

must be active and the trigger 

voltage set to 0V (see user 

manual). 

Also note that high currents can 


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Unlike the fixed Zero-Volt option 

installed by H&H, small voltages 

in this case can only be 

achieved with accurate 

settings of the trigger voltage. 

Within the range of the set 

minimum voltage it is also 

possible for oscillations to arise. 

occur if the polarity of the 

external power supply or the 

test unit is reversed and that 

these can damage the unit 

under test and the power 

supply. 

Software 

GTC 

59



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Simulation of exponential inrush currents 

Function 

Via the analog control input of 

the ZS electronic load with the 

help of a few passive 

components a control signal can 

be generated which simulates 

the current consumption of 

devices with exponentially 

decaying inrush current peaks. 

Applications 

Simulation of current 

consumption of devices at the 

point of switching on, e.g. light 

bulbs, engines etc. 

Measurement set-up 

As stated in the circuit, the 

connected input voltage is fed 

via an RC network to the 

analog control input of the 

device. 

As soon as the SW1 switch is 

closed, at the AIN10+ control 

input the RC network 

generates a rapid voltage rise 

with a subsequent exponential 

fall. 

The peak current is 

determined by the value of the 

connected voltage and the 

resistors R2 and R3. 

R1 is used to generate the 

continuous current which is set 

after the decay of the poweron 

process. 

The current can be calculated 

from the voltages at the 

voltage divider R1, R2 and R3 

and the technical data of the 


If using the 10 V control 

input the full current of the 

selected range flows at 10 V. 

The decay time constant is 

calculated from the resistors R2 

and R3 with the capacitor C1. 

The input resistance of the 

analog control input - 20 kOhm 

- must also be taken into 

account. 

The device must be set to 

constant current operating 

mode and external control. 

For smaller input voltages the 

5 V control input can also be 

used in place of the 10 V control 

input. 

Note 

Example: 

R1: 10 kΩ 

R2: 1 kΩ 

R3: 1 kΩ 

C1: 100 µF 

Input voltage: 12 V 

Electronic load: ZS3606 

Note that the load current value 

depends on the input voltage. 

Input voltage interferences are 

coupled by capacitor C1 directly 

to the control signal. 

The resistances must be 

dimensioned such that 10 V is 

not exceeded at the control 

input. 

Otherwise the electronic load 

could be damaged. 

Software 

GTC 





Switch-on process with 

electromechanical relay 

and contact bounce 

The current also follows the 

input voltage during the 

contact bounce. 

60


Function 

Via the analog control input of 

the ZS electronic load a direct 

analog adder. 

If only one control input is 

connected, only this signal is 

voltage and an alternating used to set the load current. 

voltage from a function 

If both control inputs are 

generator can overlap the load 

connected, the control signals 

current with alternating current 

are added. 

portions. 

Applications 

Test of dynamic behaviour of 

power supplies, simulation of 

loads with alternating current 

The ratio at which the signals 

are added is stated by the 

ratio of the control voltages 

(5 V and 10 V) for the rated 

current. 

portions. 

Connecting two external 

Measurement Set-Up 

resistors can change the 

addition ratio. 

The ZS electronic loads have 

two external control inputs for 

the signal levels 0 ... 5 V and 

0 ... 10 V. 

The circuit shows the input 

amplifier of the ZS electronic 

load for the calculation of the 

required resistances. 

These control inputs are 

internally connected to an 

Wiring at the Analog I/O Interface 

Example 

If R1 and R2 are both set to 190 

kOhm, the 5 V control input in 

relation to the 10 V control input 

is valued as a percentage of 

10 % of the total control signal. 

If a function generator is 

connected, max. 10 % of the 

current range can be set with an 

alternating voltage of 10 Vss. 

Note 

The superimposed AC current 

portion does not change the 

average value of the load 

current. However the peak load 

rises. 

Note that the peak load may not 

exceed the maximum current of 

the device, even if the 

average value is still within the 


Superposition of AC 

setting range. 

If a portion of the AC current is 

superimposed whose peak load 

is greater than the set DC 

value, the resulting control 

signal is negative. 

Distortions can occur in this 

case. 

The maximum frequency is 

determined by the speed of the 


(See current rise and fall times 

in the datasheet). 

ZS series input amplifier circuitry 


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Software 

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61



Characteristic recording of solar panels 


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The ZS Electronic Loads have a 

fast data logging function with 

the installation of the ZS13 

option (Data Acquisition Tool). 

Together with an optionally 

programmable waveform, the 

V-I characteristics of solar 

panels can be simply recorded. 

A particular benefit is the 

simultaneous measurement of 

voltage and current by the 

electronic ZS loads. Voltage and 

current are recorded at precisely 

the same time. 

If the Zero-Volt option is also 

Command string: 

*RST 

MODE:VOLT 

SYST:SPEED SLOW 

VOLT 30 

VOLT:CRAN 6 

LIST:VOLT 0,30 

LIST:VOLT:RTIM 0,0.05 

LIST:VOLT:DWEL 0.01,0.05 

LIST:VOLT:STR 0.001,0.0002 

LIST:VOLT:STDW 0.01,0.01 

LIST:COUN 1 

INP ON 

LIST:STAT ON 

used, the curves can also be 

recorded to within a few mV. 

Function 

The electronic load is operated 

in constant voltage mode and 

travels a ramp starting in short 

circuit and ending at a higher 

voltage than the panel´s open 

circuit voltage. 

Measured values for voltage 

and current are recorded and 

saved continuously. 

The measured values are then 

read out and shown in an 

Reading out measurement data: 

DATA:POIN //determine number x 

//of saved data records 

DATA:REM x //read out x data records 

//(t1,V1,I1,t2,V2,I2 ... tx, Vx, Ix) 

X-Y diagram (e.g. in Excel). 

Programming 

The electronic loads are 

programmed in SCPI Syntax. 

The speed of the ramp and the 

sampling rate can be adjusted 

within broad parameters. 

Example 

Measurement of the curve of a 

20 V solar panel with a ZS506-4 


The ramp starts at 0 V and rises 

within 50 ms to 30 V. 

The measurement interval is set 

to 200 μs. 

Software 





GTC 

62


Loading AC voltages with a DC load 

Loading AC Voltages 

There is often a need to load an 

alternating voltage. 

If there is no specific AC load 

you can substitute a DC load 

with a rectifier. 

Waveform 

It is important to note that the 

unit under test is loaded with 

different waveforms depending 

on the chosen operating mode. 

Example for Constant 

Current Mode 

Once, after the zero-crossing of 

the alternating voltage, the 

input voltage at the load input is 

greater than the minimum 

voltage of the electronic load, 

the current is adjusted to the 

preset value and remains 

constant for the whole trajectory 

of the half wave. 

Only when the AC voltage 

passes through zero again the 

current will drop back to 0. 

Example for Constant 

Resistance Mode 

In resistance mode the 

waveform of the load current 

depends on the height and 

waveform of the input voltage. 

This means that the current and 

the rectified input voltage are 

also half wave-shaped so that 

an approximately sinusoidal load 

current is produced for the test 

unit. 

If in direct current mode a 

constant current of 1 A is set, 

then in the case of rectified 

alternating voltage it is also 1 A. 

The waveform in this case 

however is rectangular. 

The result: A rectangular load 

current is applied to the 

AC source. 

Due to the rectangular 

waveform the current display of 

the electronic load shows the 

effective value of the load 

current. 

Example: 

Electronic Load ZS512-4, 

Input voltage: approx. 30 V 

Load current: 5 A 

Mode: Constant current 

Trigger voltage: 1.5 V 

However due to the resistance 

mode a fluctuating input voltage 

also results in a fluctuating load 

current. Distortions of the input 

voltage are also reflected in the 

load current. 

Since the current display in the 

electronic load displays the 

average value, the effective 

input current is higher by a 

factor of 1.11 due to the 

waveform. 

Electronic Load in current mode 


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Electronic Load in resistance mode 

GTC 

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63



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Avoiding inrush current peaks and minimizing the dead time at voltage connection 

Function 

The electronic loads are all fitted 

with a controller to set the 

preset reference value. 

If no input voltage is connected 

and a setting value has been 

specified for a load, the 

controller will attempt to set the 

required load current and turns 

the output stage on because 

since there is no input voltage no 

actual value is received. 

If a voltage is now applied, a 

Elimination of Dead Time 

A small trick can almost 

eliminate these times. 

It is also possible to maintain 

the load within the chosen state 

if a small voltage, sufficient to 

supply the current, is supplied 

from another voltage source. 

This auxiliary voltage is coupled 

via a diode. If the test unit is 

not yet connected the auxiliary 

voltage is applied to the load 

input via the diode and the load 

can control the set current. 

If the test unit is then 

connected, only the input 

voltage changes. The load 

however, needs not to readjust. 

This considerably reduces the 

dead time and the settling time. 

short circuit occurs on the load 

input at the moment of 

connecting. 

The controller recognizes the 

much too high current and 

reduces it according to its 

preset control time. 

Current peaks when switching on the voltage 

Note 

For EMC reasons the electronic 

loads have an input filter. 

A specific capacity is therefore 

present in the load input. The 

output stage itself also has an 

inherent capacity which depends 

on the number of semiconductors 

used and therefore 

on the size and power of the 

device. 

When voltages are connected 

this capacity is evident due to 

load currents at the moment of 

connecting the input voltage. 

The capacity values are defined 

in the devices´ technical data. 

Remedy 

To avoid these inrush current 

peaks a minimum voltage 

detector is installed in the H&H 

devices which prevents the 

controller from switching on 

the output stage fully in the 

absence of input voltage. 

Depending on the device series 

the minimum voltage is fixed 

or variable. If the input voltage 

is lower than the minimum 

voltage, the output stage is 

disabled and the controller is 

enabled only when the input 

voltage is sufficient to set the 

required load current. 

The load current is then 

increased from 0A to the 

preset current. In addition to 

the control time a dead time 

also exists, caused by the 

minimum voltage detection. 

Delay due to setting of the minimum 

voltage detection 

Wiring of an auxiliary power supply 

Software 

GTC 





Delay-free switching of the input voltage 

by using an auxiliary voltage source 

64



Non-linear AC current loads with ZSAC series 

Power Factor PF 

A power factor is defined 

whenever the product of 

voltage and current does not 

equal the actual effective 

power. 

The power factor can be widely 

used therefore and refers both 

to the sinusoidal signals and 

other signal forms. 

cos phi (Displacement Power 

Factor) 

Cos phi is a special form of 

power factor which only applies 

when sinusoidal signals are 

present, as in the case of 

The diagrams below show the 

voltage (blue), the current 

(red) and the power (green). 

inductive and capacitive loads. 

Crestfactor (CF) 

Defines the ratio of the peak 

value to the effective value of a 

voltage. 

A sinusoidal voltage has crest 

factor 1.41. 

Function Principles of 

Electronic AC Loads 

Electronic AC loads function in 

principle like direct current loads 

with rectifier. 

The control voltage needed to 

set the load however is not a 

static signal as with direct 

current but is half wave-shaped 

according to the rectified input 

voltage. 

A sinusoidal AC current is 

thereby generated at the input 

of the rectifier. 

As a result of the rectifier, the 

energy in the case of alternating 

current loads can flow only in 

the load direction and never 

back towards the source. 


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Definition of the Terms 

It is often necessary to apply 

non-linear loads to AC voltages. 

The terms used; cos phi, crest 

factor, power factor etc. can 

often lead to confusion. 

This Application Note defines 

what is possible with the 

ZSAC series electronic loads and 

what is not. 

What Does the Voltage and 

Current Waveform Look Like 

in Non-Linear Loads 

In order to evaluate which loads 

are possible with an electronic 

load and which are not it makes 

sense to look at a few load 

cases: 

Particular attention is paid to 

the direction of the energy flow 

because the electronic load can 

consume, but cannot generate, 

power. 

Example 1: 

Sinusoidal current without 

phase shift 

(ohmic load) 

CF = 1.41, cos phi = 1 

This means that the load can 

reflect this case (typical application). 

Accessories 

65



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Example 2 

Sinusoidal current with 60° 

phase shift 

CF = 1.41, phi: 60° lagging 

Current and voltage are phaseshifted. 

Clear ranges in which 

power becomes negative. 

The load cannot reflect this 

case. 

Example 4 

CF = 5, phi: 0° 

Current and voltage are in 

phase. There are no ranges in 

which the power curve becomes 

negative. 

The load can reflect this case. 

Example 3 

Sinusoidal current with 90° 

phase shift 

CF = 1.41, phi: 90° lagging 


The power has large 

portions in both the negative 

and positive ranges (pure 

reactive power). 


case. 

GTC 

Software 

ZSLV 

Low Voltage 

NL 

Source-Sink 

66


Example 5 

CF = 5, phi: 45° leading 


There are still no ranges in 


negative. 

The load can still reflect this 

case. 

Result 

Phase shifts are only possible in 

combination with a setting of 

the crest factor to values >1.41. 

The greater the crest factor (the 

narrower the current pulse), the 

further one can shift the phase. 

Phase shifts with sinusoidal 

currents as with inductive or 

capacitive loads are not possible 

because with each phase angle 

deviating from 0° there would 

have to be energy flow into the 

source. 

Example 6 

CF = 5, phi: 70° leading 


There are ranges in 


negative. In this case the 

electronic load would have to 

generate power. 


case. 


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Software 

GTC 

67



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Acessories 


Battery simulation with electronic load and power supply 

For DUTs which need a battery 

to function or whose operating 

or adjustment parameters 

depend on battery voltage, this 

can be simulated with the aid of 

a power supply and an 


Circuitry Principle 

The power supply is wired 

parallel to the load via a 

decoupling diode. 

The wired system is stabilized 

with an electrolytic buffer 

capacitor. Ideally the current 

and voltage ranges of the power 

supply and the electronic load 

are approximately equal. The 

following circuit principle 

clarifies the structure of this 

kind of battery simulator 

system. 

Functional Principle 

The output voltage of the 

power supply and the trigger 

voltage of the electronic load 

are controlled via a common 

analog signal (e.g. 0 ... 10 V). 

In ZS series electronic loads 

this can be achieved with the 

ZS08 option. The electronic 

load must be operated in 

constant current mode. 

A corresponding distribution of 

the control voltage means that 

the output voltage of the power 

supply is set slightly above the 

trigger voltage value of the 

load. 

This voltage difference should 

be as small as possible but 

equally no transverse current 

must flow. By changing the 

trigger control voltage therefore 

different battery voltages can be 

simulated. 

Software 

GTC 





68


Option MPP Tracking (ZS13) 

The ZS series Electronic Loads 

can be upgraded with the ZS13 

option to perform MPP tracking 

(Maximum Power Point 

Tracking). 

MPP tracking is used with solar 

panels to determine the panel's 

maximum possible power. This 

operating point (MPP) is derived 

from the characteristic of a solar 

panel. The MPP function of the 

electronic load searches for this 

point and tracks it, even when 

Input of system parameters 

The extent to which the 

electronic load controls via the 

MPP can be determined by 

inputting the system parameter 

no. 53 "Delta_P_min". 

The electronic load also needs 

details about the values in the 

table below: 

the sun's radiation fluctuates. 

Functional principle 

For correct use of the MPP 

function of the electronic load it 

is necessary to understand the 

functional principle. 

The electronic load operates in 

MPP mode in constant voltage 

mode. 

If the function is activated, the 

load starts with a higher voltage 

than the max. voltage of the 

These parameters are needed 

for the electronic load to set the 

suitable current range and find 

the MPP point as fast as 

possible. 

The parameters are saved 

permanently to the device and 

are available after switching the 

mains power off and on again. 

Panel data Abbreviation Parameter 

Rated power „Pmax“ 48 

Open circuit voltage „VOC“ 49 

Max. short circuit current „ISC“ 10 

Voltage in MPP „VPM“ 51 

Current in MPP „IPM“ 52 

Power range „Delta_P_min“ 53 


MPP tracking with ZS series Electronic Loads 

solar panel and reduces the 

voltage. 

When the specified voltage on 

the electronic load is less than 

the actual voltage of the solar 

panel, current starts to flow. 

The electronic load continually 

measures voltage and current 

and calculates the recorded 

power. 

While the power increases the 

direction of the voltage change 

is retained. If the power falls 

(when the settings exceed the 

maximum power) the direction 

of the voltage change reverses 

so that the power rises again. 


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High „Delta_P_min“ 

The diagram shows voltage 

(top), current (centre) and 

power (bottom). 

The electronic load adjusts the 

voltage up or down constantly 

until the output deviates from 

the stated "Delta_P_min" value. 

The voltage then changes 

direction until the same 

deviation is present in the other 

Limits of the MPP Mode 

If "Delta_P_min" is set too high 

for a panel, the panel will not be 

able to deliver that output and 

the MPP control will alternate 

constantly between open circuit 

and short circuit. 

This can also occur if the panel 

is shaded or only minimal 

radiation is present. 

direction. 

At higher "Delta_P_min" values 

the triangular voltage trajectory 

is clearly visible. 

The top point of the output 

curve represents the MPP value. 

Lower „Delta_P_min“ 

If the "Delta_P_min" value is 

reduced (here by a factor of 10 

in relation to the diagram 

before), the amplitude of the 

triangular voltage reduces and 

the output curve also becomes 

flatter. 

The electronic load operates 

very close to the MPP value. 

Smallest „Delta_P_min“ 

If "Delta_P_min" drops further 

the control behaviour will 

change the voltage very little 

and the output will remain 

constant at the MPP point. 

MPP mode cannot be maintained 

if the electronic load reaches its 

power limits (max. voltage, 

max. current of respective range 

or max. power). 

GTC 

NL 

Source-Sink 

Software 

70


Data Logging During MPP 

Mode 

If voltage and current are 

measured on the panel during 

MPP mode, note that voltage 

and current values will not be 

constant due to the MPP control 

function. 

They will fluctuate depending on 

the "Delta_P_min" setting. (See 

diagrams on wave trajectory 

with different Delta_P_min 

values). 

If Delta_P_min is very high (in 

relation to the real panel power) 

the measured power values will 

worsen. 

Determining the 

Delta_P_Min Parameter for a 

Panel 

The "Delta_P_Min" parameter 

states how far the control may 

deviate from the last 

determined MPP point in each 

control process before the MPP 

is re-determined. 

In a new device "Delta_P_Min" 

is set as default to the following: 

Delta_P_Min = 

0.0002 * nominal voltage 

* max. device current 

Example: ZS530-3: 

0.0002 * 300 V * 12 A = 0.72 W 

MPP tracking programming 

example 

Commands: 

SYST:PAR 48,224 

SYST:PAR 49,36.8 



Setting the Device Current current will flow so a smaller 

Range to Suit the DUT 

current range would be 

advisable. 

The ZS electronic loads can 

have up to 4 setting ranges. In this case the "IPM" value will 

be programmed correspondingly 

When operating in MPP tracking, 

lower so that the device chooses 

the setting range must be such 

a smaller current range. 

that the max. short circuit 

current is still covered even at 

the highest radiation. 

Check which current ranges are 

available to the electronic load. 

This is ensured by programming If however in this case full 

the parameter 50 "ISC" (panel radiation is unexpectedly 

short circuit current). 

encountered, it may be the case 

that the electronic load would 

The device sets and maintains 

have to adjust to a higher 

the appropriate current range at 

current than the maximum 

the start of MPP tracking. 

possible current of the set range 

If radiation on the panel falls it 

is possible that a far lower 

in order to maintain the MPP. 

The electronic load then signals 

Panel technical data 

Rated power 

224 W 

Voltage at rated power 

29.2 V 

Current at rated power 

7.68 A 

Open circuit voltage 

36.8 V 

Short circuit current 

8.09 A 

This setting is suitable for a actual MPP point and the 

panel of 50W or more. In MPP average power is far lower. 

tracking the actual value 

The value for "Delta_P_Min" 

deviates then by just 0.72W 

should also be changed if low 

from the MPP point. In the case 

radiation is expected for an 

of lower-powered panels 

extended period. 

however a smaller value must 

be set, otherwise the MPP If a panel delivers only a 

control strays too far from the fraction of its power, the 

the overcurrent limit „OCP“. 

The "OCP" status should 

therefore be read out from the 

control program continuously to 

be able to respond. 

"Delta_P_Min" value should be 

adapted. 

Accordingly, if a current range is 

changed due to too low 

radiation the value for 

"Delta_P_Min" must also be 

changed. 

If "Delta_P_Min" is set to 0 the 

device uses the technically 

smallest possible value 

internally. 

The "Delta_P_Min" value is 

permanently saved in the device 

and is retained when the mains 

voltage is switched off and on. 


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MODE:VOLT 

MODE:MPP 

INP ON 

ZS512-4 

with 4 current ranges 30mA to 30A 

and option ZS13 is ideal for MPP tracking of all different sizes 





Software 

GTC 

71



ZSLC 

Water-cooled 

ZSLV 

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AC 

NL 

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Accessories 

BEL Test Battery Testing Software 

(for ZS, ZSLC, ZSLV Series) 

Hardware 

The control software BEL Test 

works with all electronic loads 

of the ZS, ZSLC and ZSLV 

series. 

Therefore charging/discharging 

systems can be produced with 

different power supplies 

provided the devices have a 

RS-232 or GPIB interface and 

Charging 

Charging is carried out 

according to the CC-CV process 

and can be divided into three 

charging phases with different 

charging currents and cut-off 

voltages. 

the programming language is in 

SCPI. 

This flexibility means that the 

optimal system can be 

configured for any test 

application and changed or 

expanded at any time. 

Switching to the next charging 

phase takes place after a preset 

time, a voltage or according to 

the CC-CV characteristic. 

Various overriding shut-down 

criteria can be activated to 

cancel the charging process. 

Discharging 

In the discharging phase, 30 

current values can be saved to a 

spreadsheet with an associated 

time. 

This current waveform can be 

processed continually or in a 

Application 

The BEL Test software controls 

an electronic load and a power 

supply for testing batteries, 

rechargeable batteries and other 

energy storage devices. 

There is a charging program and 

a discharging program. 

Measured values are acquired 

during the test and can be 

saved for documentation and 

further processing. 

The program can also be used 

with just an electronic load for 

discharging or just with a power 

supply for charging. It is not 

essential to construct a system. 

specified number. 

The discharge process is also 

monitored and cancelled by 

various shut-down criteria. 

GTC 

Software 

Charging menu 

Discharging menu 

72


Display 

Both program sections include 

displays for the actual cell 

voltage, total voltage, charge/ 

Cut-off Criteria 

There are various cut-off criteria 

available to cancel the charging 

and/or discharging phase. 

These can be activated 

individually. 

Cell voltage 

CC/CV cut-off 

Time from start of test 

Graphical Display 

Current and voltage are 

graphically displayed during the 

test. 

Logging 

To document and further 

process the test you can save 

measured values to your hard 

drive in *.csv format at 

predefined intervals. 

Time stamp 

Cell voltage 

Current 

Charged and discharged 

capacity 

Temperature 

Test status 

discharge current and capacity, 

test time and temperature 1) . 

Charged and discharged 

capacity 

Temperature 1) 

(external temperature 

sensor) 

Logic screen 1) 

8 bits freely configurable 

(and/or linked) 


ZSLC 

Water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

Accessories 

1. Only possible with corresponding 

options for the electronic load. 

GTC 

NL 

Source-Sink 

Software 

73


General Terms and Conditions of Business, Delivery and Payment 


ZSLC 

water-cooled 

ZSLV 

Low Voltage 

PMLI 

Multi-channel 

ZSAC 

AC 

NL 

Source-Sink 

Accessories 

Software 

GTC 

We only deliver to merchants and customers who have equal statements to 

these „General Terms and Conditions“, regulating matters according to the 

law. 

For business transactions with this clientele the following conditions of 

business, delivery and pay shall be valid. 

1. Offers 

We shall reserve the title of ownership and copyrights of all drawings, drafts, 

and estimates of cost and others. 

They may not be made accessible to a third party. In the event there is no 

placing of an order, any supporting material shall be returned immediately. 

2. Confirmation of the Order 

When receiving our confirmation of the order, the party ordering acknowledges 

our terms of business, delivery, and payment. Any opposing purchase 

conditions of the purchaser shall not be subject matter of the contract. 

3. Range of Obligations 

The range of obligations set forth according to the offer shall determine the 

extent of the performances to be made and that have been made. For 

subsequent requests for alteration the amount for higher or lower 

performances shall be accounted or credited according to the expenses. 

4. Conditions of Delivery 

Deliveries are expressly started ex works. The shipment shall be carried out for 

the account and at the risk of the orderer. Any deliveries shall principally be 

insured at the expense of the orderer, unless he is not subject to a ban of a 

forwarding agent´s insurance certificate or a cartage insurance certificate. 

H&H shall choose the means of shipment, whereas in any case that means of 

traffic shall be chosen that seems to be the most suitable. H&H shall give no 

guarantee for speed and price. 

5. Packing 

We charge fees for packing at prime cost. 

6. Delivery Periods 

Periods of delivery shall begin after all the technical and commercial details 

have been clarified, and after the order has presented all the required 

supporting material and ancillary supplies. We shall endeavour to fulfil the 

determined periods of delivery according to our best discretion. In the event of 

a delay of delivery due to circumstances that were unknown to us at the time of 

the order, and for which we are not responsible, the periods of delivery shall 

be prolonged to an acceptable extent. 

7. Final Inspection 

Equipment and installations agreed upon to be accepted by the customer shall 

finally be inspected 14 days after receipt of a request in writing, otherwise the 

equipment shall be considered as accepted. Requests for alteration after 

acceptance that differ from the extent of the order shall be charged according 

to expenses. 

8. Warranty 

Warranty shall only be given on the condition that no change has been made 

on the equipment, and that the defect has occurred in accordance with the 

determined use of the equipment. 

Since H&H does not know the intended application of the devices as well as 

the physical conditions of the units which will be tested no warranty for the 

desired function can be given. 

Defects shall be remedied by repair or replacement, if we or a representative 

of ours are informed of it 24 months of the date of the delivery note, and if 

they are acknowledged. Place of fulfilment of a warranty is 94357 Konzell. The 

customer shall pay the shipment to H&H, the costs for the return are paid by 

H&H. If, after consulting H&H, the warranty will be fulfilled by one or more 

H&H employees at the place of the customer, the costs for the required 

material and the working time shall not be charged. The costs for travel, driven 

kilometers and overnight stay, if necessary, shall be charged. 

After expiration of the warranty period, all material and working time costs are 

charged to the customer. In this case the customer has to pay both the freight 

to H&H and back to the customer. In case of repair on site, also the costs for 

travel, driven kilometers and overnight stay, if necessary, shall be charged. 

At unauthorized complaints all costs are billed to the customer if necessary. 

Claims for warranty shall be notified in writing, with a precise specification of 

the detected defects, as well as the naming of the competent partner. 

In the event the equipment is damaged by exceeding the technical data, there 

shall be no justified claim for warranty. Replacement deliveries are principally 

understood ex works. Ancillary expenses such as transport charges, fitting, or 

expenses for fitting, shall be borne by the purchaser. Warranty is not liable for 

replacement parts that are subject to normal wear and tear. Damages due to 

transport are also excluded from warranty. We shall not be liable for 

subsequent damages, unless they are subject to our gross negligence. 

9. Limitation of Liability 

Compensation for damages which have not occurred to the contract itself, are 

excluded. 

10. Reservation of Ownership 

We deliver only on the basis of the reservation of title described hereinafter 

more nearly. 

This also applies to all future deliveries even if we particularly don't always 

refer to it. 

We keep the proprietary right to the delivered thing until the complete 

payment of all demands from the contract of sale. We are authorized to take 

the purchased thing back if the buyer behaves in breach of contract 

agreement. 

The buyer is obliged as long as the property hasn't changed on him yet to 

treat the purchased thing carefully. Note: particularly he is obliged to insure 

these against theft, fire and water damages at the own expense to the value 

as new sufficiently. If maintenance and inspection work must be carried out, 

the buyer has to execute these at the own expense on time. As long as the 

property hasn't changed yet, the buyer has to inform us immediately in writing 

if the delivered object is impounded or exposed to other interventions of third 

parties. The buyer is liable for the failure resulted for us the legal costs out of 

court of a complaint to refund us in accordance with § 771 ZPO as far as the 

third party is not able. 

The buyer is authorized to the further disposal of the reservation product in 

the normal commercial traffic. The buyer hands over the demands of the 

buyer from the further disposal of the reservation product to us already now 

in height of the invoice final amount agreed on with us (including value 

added tax). This assignment is independently of valid whether the purchase 

thing has been resold without or after processing. The buyer remains 

authorized to the collection of the demand also after the assignment. Our 

authority to move in the demand by ourselves, remains untouched of this. We 

won't retract the demand, however, as long as the buyer meets his financial 

obligations from the taken earnings, is not in delay of payment and no 

application for opening of an insolvency method particularly is made or there 

is stoppage of payments. 

Provided that the purchase thing is processed with objects not belonging to 

us, we purchase the co-ownership of the new thing for the objective value of 

our purchase thing to the other finished objects in the time of the processing 

proportionally. 

We oblige each other to release the securities being entitled to us on desire of 

the buyer as far as their value exceeds the demands to be secured around 

more than 20%." 

11. Prices 

Prices are valid ex works, packing excluded. We reserve the right to an 

adjustment of prices according to an increase of wages or prices for material 

between date of order and delivery. 

12. Conditions of Payment 

Payment of amount of invoice: net payment without any deduction within 30 

days of date of invoice. By date of invoice we understand day of shipment or 

day of readiness for shipment. A discount of 2 % shall be granted if payment 

is made 14 days after date of invoice. Payment of amount of repair invoice: 

net payment without any deduction within 14 days of date of invoice. 

Less 3% when the payment is made in advance after the goods are ready for 

shipment. Shipment is made after incoming payment. 

If the value of the order is at least of a net amount of EURO 25 000.00, 30 % 

advance payment shall be due as of date of the incoming order, and 70 % 

when delivered. Orders for which an advance payment is made shall only 

then be valid as accepted and shall be executed, when the advance payment 

has been paid into an account of H&H. In the event the period of payment is 

exceeded, default interest of 2 % above the discount rate of the Land Central 

Bank shall be charged. The handling charge for a letter demanding payment 

is al lump sum of Euro 5.00. 

Deliveries to new and delinquent customers are subject to advance payment. 

13. Place of Performance and Jurisdiction 

For delivery and payment the place of performance is Konzell. 

Jurisdiction is Straubing. 

14. Storage of Data 

This is what me make known to you: According to paragraph 26 

subparagraph 1 of the Federal Data Protecting. Law (German abbreviation: 

BDSG = Bundesdatenschutzgesetz) we have stored your data in our EDP – 

equipment, on the purpose of business transactions. 

The Höcherl & Hackl GmbH keeps all documents -- technical and business -- 

for at least 10 years. 

LZB_E_08 valid as of March 1st., 2013 

74

Johann Hackl 

Helmut Höcherl 

After more than 25 years of Electronic Loads 

from Höcherl & Hackl GmbH 

the managing directors would like to thank 

all our customers for their loyalty.

Hoecherl & Hackl GmbH 

Industriestr. 13 

94357 Konzell 

Germany 

Tel.: +49 9963/94301- 0 

Fax.: +49 9963/94301-84 

E-Mail: office@hoecherl-hackl.com 

http://www.hoecherl-hackl.com 

The Electronic Load

The Electronic Load

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