1 DESCRIPTION AND OPERATION
1.1 Designation of instrument
Instrument is intended for measurement:
- insulation resistance of circuits that are not under voltage;
- DC/AC voltage before measurement;
- automatically calculate Dielectric Absorption Ratio (DAR) and Polarization Index (PI);
- continuity of earth connections and equipotential bonding;
- parameters of overvoltage protective devices (varistor voltage of overvoltage
suppressors at by direct-current flow 1 mА, static breakdown voltage discharge arresters at
DC).
1.2 Basic metrological characteristics:
Table 1 –
Basic metrological characteristics
1 Electric resistance measurement of insulation to direct current
Resistance measurement range
Аccuracy
1 k
Ω
to 999 MΩ
(3% + 3 digits)
(3% + 3 digits)
1.00 to 9.99 GΩ
(5% + 5 digits) (< 250 V test voltages)
10.0 to 99.9 GΩ (from 500 V test voltages)
(5% + 5 digits)
100 to 300 GΩ (from 500 V test voltages)
(15% + 10 digits)
Resistance measurement range, as per IEC 61557-2
from R= Utest /1 mA to 10 GΩ
(at test voltage less than 500 V)
from R= Utest /1 mA to 300 GΩ
(at test voltage more than 500 V)
2 Test voltages
Test voltage
50, 100, 250, 500, 1000, 2500 V or
any from 50 to 2500 V (setup step 10 V)
Test voltage accuracy
+15% maximum on open-circuit
Short-circuit current
< 2mA
3 Voltage measurement (DC/ AC 45-60 Hz sine)
Measurement range
40 to 700 V
Accuracy
(5% + 3 digits)
4 Measurement of varistor voltage
at 1 mA DC Test current
Мeasurement range
100 to 1500 V
Accuracy
(3% + 5 digits)
Error of 1 mA
test current generation
2,5 %
3
