Simple portable diagnostic device designed for quick control of surge protection devices (SPD) containing metal oxide varistors and gas-filled surge arresters (GDT).

The device allows you to control:
a) The value of the so-called. varistor voltage UV @ 1 mA [V] for the SPD to 1000V containing varistors
b) The level of DC ignition voltage UVDC [V] for the SPD to 1000V containing gas discharge tubes (GDT)
c) The value of an insulation resistance Riso (from 25VDC up to 1000VDC)



 - MH denotes a measured value, D represents a digit

Buttons specification:

1) Ѻ
- Key used to on (1x) or off (2x) device. If the device is switched on, you can briefly press the button to turn on (or off) light LEDs located on the front wall

2) Riso/USPD - measuring mode selection button
Riso mode - in this mode it is necessary to preset setpoint max. measuring voltage using the buttons ↓ ↑ UTEST (can be adjusted 25,50,100,250,500 or 1000 V). After starting the measurement with the START button on the bottom right display shows the measured value Riso.
SPD mode - in this mode takes place after the start of the measurement by pressing START testing non-linear element connected DC current of 1 mA. If the measured element metal is oxide varistor, the display shows the value of current through the SPD UV @1 mA [V].If the measured component is the gas-filled surge arrester (GDT), the display shows the value its DC ignition voltage UVDC [V].

- Button enabling in mode USPD set minimum (DCmin) or maximum (DCmax) level transmitter mA point UV (in volts) for the so-called repeated measurements of the same type SPD. Setting these levels to the desired value using the buttons ↓ ↑ UTEST.

Note: If the setting of levels DCmin and DCmax are done correctly, the test result SPD display text is either .... Test OK ....or TEST x.