industry current voltage transducers

HO SERIES
HO’s main benefits include the following
HO SERIES
HO name and codification
DRS / REU
• Three programmable current ranges: 8 A RMS
, 15 A RMS
, 25 A RMS
(25 A RMS
set by default)
• A broad range of programmable functions including Low power mode, Standby mode, and EEPROM control (fault reporting)
• Single + 3.3 V or + 5 V power supply (in two different HO versions)
• Offset and gain drifts two times better than the previous generation
• Programmable over-current detection (OCD) function provided on a dedicated pin, to be set by the user over 16
programmable levels up to 5.8 x I PN
(the nominal primary current). The OCD output turns on within 2 μs when programmed
over-current occurs, switching from a high (5 V) to a low level (0 V). The over-current threshold is detected with 10 %
accuracy; the user can set a minimum duration of the OCD output pulse of 1 ms if required, to ensure that a short overload
can still be detected by an external micro-controller
• Programmable slow or quick response time (2 to 6 μs) by choosing specific output filters
• Four programmable internal reference voltages: 2.5, 1.65, 1.5 or 0.5 V (with + 5 V power supply), available on a dedicated pin
• Possible use of an external voltage reference from 0.5 to 2.65 V (with + 5 V power supply)
DRS / REU
• Measuring range up to 2.5 x I PN
• -40 to +105 °C operating temperature range.
Only V ref IN
Code: 4
• High accuracy at +25 °C: 1% of I PN
and at +85 °C: 2.9% of I PN
• Creepage & clearance distances: 8 mm + Comparative Tracking Index 600 V
• Small device outline: 12 (W) x 23 (L) x 12 (H)mm
• Through-hole and SMT packages
Key parameters of HO 25-NPPR/-NSMPR models
Programmable
Rating I PN
(A RMS
)
8 or 15 or 25
Accuracy @ +25 °C
(% of I PN
)
Measuring range I PM
(A) +/- 2.5 x I PN
Accuracy @ +105 °C
(% of I PN
)
Linearity (% of I PN
) 0.5
Supply Voltage (VDC) + 3.3 or + 5 +/-10 %
Programmable internal
Reference V Ref OUT
(V)
Frequency Bandwidth
(kHz) (3 dB)
1
3.8
0.5 / 1.5 / 1.65 / 2.5
DC..100 to 600
Analog Voltage Output
(V) @ I PN
0.8 Offset drift (mV/K) +/-0.095
Programmable Response
time @ 90 % of I PN
tr (us)
2 - 3.5 - 6 Gain drift (ppm/K) +/- 220
Users program the HO transducer through a connection to a host microcontroller: when the V Ref
pin is forced to the supply
voltage, the output pin becomes the I/O port of a single wire bus interface. Over this interface, serial data comprising a 12-bit
word conveys the user’s configuration choices, such as, amongst others: range selection, the internal refe rence voltage, and
the over-current detection threshold. Data is sent over this interface to the transducer at 10 kbits/s, and programming takes only
a few hundred milliseconds. This programming procedure may be carried out at any time, so the operating parameters of the HO
transducer may be re-assigned, even during operation of the device in its application.
For users who require transducers already programmed to a single set of operating parameters, LEM can also offer models with
performance and function already set at the factory.
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