• Delivery RET-MICROin stock
  • Warranty 5 years
  • Price on-demand

The rectifier unit and differential amplifier are designed for expanding RETOM-21 system functionality and enable testing automatic DC circuit-breakers and measuring transient resistance above 1 µOhm with relative error below 2%.

Rectifier Unit (RET-BV)

The rectifier unit enables increasing direct current injected by RETOM-21 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 instrument with power cables included in RETOM-21 delivery set.

Differential amplifier (RET-UD)

The differential amplifier enables increasing sensitivity threshold of RETOM-21 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 instrument. The display of the device shows the measured value with consideration for the gain, which is user-convenient.

Rectifier unit

Kind of test current

rectified, unsmoothed

Maximum input voltage, V


Maximum output current value when operated jointly with RETOM-21, A


Unit weight, kg, max.


Unit overall dimensions (w/o cables), mm, max.

235 х 120 х 65

Length of input cables, m, min.


Differential amplifier

Maximum input voltage at Кg = 10, mV RMS


Maximum input voltage at Кg = 100, mV RMS


Maximum output voltage, V RMS


Unit weight, kg, max.


Unit overall dimensions (w/o cables), mm, max.

145 х 92 х 35

Cable length, м, m, min.


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