The Electronic Load

The Electronic Load
H&H Application Note #5
Characteristic recording of solar panels
Application Notes ZS PL H&H
ZSLC
Water-cooled
ZSLV
Low Voltage
PMLI
Multi-channel
ZSAC
AC
NL
Source-Sink
Accessories
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
electronic load.
The ramp starts at 0 V and rises
within 50 ms to 30 V.
The measurement interval is set
to 200 μs.
Software
H&H offers no guarantee for the function of
the suggested applications.
H&H offers no guarantee for damage resulting
from such applications.
GTC
62