The rectifier unit and differential amplifier are designed for expanding RETOM-21/25 system functionality and enable testing automatic DC circuit-breakers and measuring transient resistance above 1 µOhm with relative error below 2%.
The rectifier unit enables increasing direct current injected by RETOM-21/25 system up to 400 A. It is designed for testing automatic DC circuit-breakers within 8 … 400 A range and measuring transient resistance. The unit is connected to I5 output of RETOM-21/25 instrument with power cables included in RETOM-21/25 delivery set.
The differential amplifier enables increasing sensitivity threshold of RETOM-21/25 instrument for measuring low voltage levels. The amplification error within 0.3 mV … 300 mV range is 0.5%. The unit uses two gains – 1:10 and 1:100. Maximum output voltage is 3 V. The amplifier is connected to PV2 input of RETOM-21/25 instrument. The display of the device shows the measured value with consideration for the gain, which is user-convenient.
Kind of test current
|
rectified, unsmoothed |
Maximum input voltage
|
10 V |
Maximum output current value when operated jointly with RETOM-21
|
400 А |
Length of input cables, min.
|
1 m |
Operating temperature range
|
- 20 ... + 50 °С |
Unit weight, max
|
5 kg |
Unit overall dimensions (w/o cables), max
|
235 х 120 х 65 mm |
Maximum input voltage at Кg = 10, RMS
|
300 mV |
Maximum input voltage at Кg = 100, RMS
|
30 mV |
Maximum output voltage, RMS
|
3 V |
Cable length, min
|
1,5 m |
Operating temperature range
|
- 20 ... + 50 °С |
Unit weight, max
|
0,3 kg |
Unit overall dimensions (w/o cables), max
|
145 х 92 х 35 mm |