Measuring instruments
The portable tester G-Tester
for measuring of varistors mA point, DC ignition voltage of GDTs and insulating resistances
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
at 1 mA [V] for
the SPD to 1000 V containing varistors.
b) The level of DC ignition voltage UVDC [V] for the SPD to
1000 V containing gas discharge tubes (GDT).
c) The value of an insulation resistance Riso (from 25 V DC up
to 1000 V DC).
| Insulation resistances | |
| Measuring range | 0,100 MΩ ÷ 1,999 GΩ (U = 25 V ÷ 99 V) 0,100 MΩ ÷ 3,999 GΩ (U = 100 V ÷ 249 V) 0,100 MΩ ÷ 9,999 GΩ (U = 250 V ÷ 1000 V) |
| Resolution range | 0,001 MΩ / 0,01 MΩ / 0,1 MΩ / 0,001 GΩ |
| Basic measurement error | ± (2% of MH + 10 D)* (R < 1 GΩ) ± (4% of MH + 15 D)* (R ≥ 1 GΩ) |
| Operating measurement error | ± (3% of MH + 20 D)* (R < 1 GΩ) ± (5% of MH + 25 D)* (R ≥ 1 GΩ) |
| Rated measuring current | ≥ 1 mA |
| Short circuit current | < 3 mA |
| Automatic discharge of measured object | yes |
| Voltage DC and AC | |
| Measuring range UIn | 0 V ÷ 600 V DC / AC (45 Hz ÷ 65 Hz) |
| Resolving range | 1 V |
| Basic measurement error | ± (2% of MH + 2 D)* |
| Operating measurement error | ± (3% of MH + 3 D)* |
| Surge protection devices | |
| Measuring range | 40 V ÷ 1050 V |
| Resolution range | 1 V |
| Basic measurement error | ± (2% of MH + 2 D)* |
| Operating measurement error | ± (3% of MH + 3 D)* |
| The measurement principle | increase voltage measurement through the SPD |
| Universally | |
| Power | 4 x AAA (LR03) alkaline batteries 1,5 V or NiMH accumulator 1,2 V |
| Display | OLED, multicolored graphic |
| Protection class | II (double insulation) |
| Overvoltage category | CAT III / 300 V or CAT II / 600 V |
| Degree of pollution | 2 |
| Protection type | IP43 |
| Dimensions | 260 x 70 x 40 mm |
| Weight | 0,36 kg |
| Article number | 99000 |
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 is metal oxide varistor, the display shows the value of current through the SPD UV at 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].
3) FUNC - 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