Varistor Test - METREL EurotestXC MI 3152 Instruction Manual

MI 3152(H) EurotestXC (2,5 kV)

12.22 Varistor test

Udc – DC Voltage
Measuring range (V)
0 ... 1000 (2500)*
Uac – AC voltage
Measuring range (V)
0 ... 625 (1562)*
* MI 3152H only
Measurement principle .................... d.c. voltage ramp
Test voltage slope ........................... Nominal test voltage up to 1000 Vdc : 100 Vdc/s
Threshold current ............................ 1 mA
12.23 ISFL – First fault leakage current (MI 3152 only)
Isc1, Isc2 – First fault leakage current
Measuring range (mA)
0.0 ... 19.9
Measuring resistance .................................. approx. 390 
Nominal voltage ranges .............................. 93 V  U
12.24 IMD (MI 3152 only)
R1, R2 – Threshold insulation resistance
R (kΩ)
5 ... 640
I1, I2 – First fault leakage current at threshold insulation resistance
I (mA)
0.0 ... 19.9
Nominal voltage ranges .............................. 93 V  U
) See chapter 7.22 IMD – Testing of insulation monitoring devices (MI 3152 only) for more
*
information about calculation of first fault leakage current at threshold insulation resistance.
Resolution (V)
1
Resolution (V)
1
Nominal test voltage 2500 Vdc : 350 Vdc/s (MI 3152H only)
Resolution (mA)
0.1
 134 V
L1-L2
185 V  U  266 V
L1-L2
Resolution (kΩ)
5
Resolution (mA)
0.1
 134 V
L1-L2
185 V  U
L1-L2
189
Technical specifications
Accuracy
(3 % of reading + 3 digits)
Accuracy
Consider accuracy of Udc
Accuracy
±(5 % of reading + 3 digits)
Note
up to 128 steps
Note
calculated value*
 266 V
)