The instruments meet the requirements of the EN 61557 standard.
Insulation resistance measurement (two-lead)
Measurement range acc. to IEC 61557-2: 50k…15,0 TΩ (IISOnom = 1,2 mA or 3 mA)
| Range | Resolution | Accuracy |
| 0,0…999 kΩ | 1 kΩ | ±(3% m.v. + 10 digits) |
| 1.00…9,99 MΩ | 0,01 MΩ | |
| 10.0…99,9 MΩ | 0,1 MΩ | |
| 100…999 MΩ | 1 MΩ | |
| 1.00…9,99 GΩ | 0,01 GΩ | |
| 10.0…99,9 GΩ | 0,1 GΩ | |
| 100…999 GΩ | 1 GΩ | ±(3.5% m.v. + 10 digits) |
| 1.00…9,99 TΩ | 0,01 TΩ | ±(7.5% m.v. + 10 digits) |
| 10.0…15,0 TΩ | 0,1 TΩ | ±(10% m.v. + 10 digits) |
Values of measured resistance depending on measurement voltage
| Voltage UISO | Measurement range |
| 250 V | 500 GΩ |
| 500 V | 1.00 TΩ |
| 1000 V | 2.00 TΩ |
| 2500V | 5.00 TΩ |
| 5000V | 15.0 TΩ |
Measurement of leakage current
| Range | Resolution | Accuracy |
| 0…ILmax | m, µ, n [A] | Calculated basing on resistance measurements |
· ILmax – maximum current at short circuit of leads,
· resolution and units result from the measurement range of individual insulation resistance.
Step voltage insulation resistance measurement
| Target voltage | Measurement voltage sequence |
| 1 kV | 200, 400, 600, 800, 1000 V |
| 2.5 kV | 0.5, 1, 1.5, 2, 2.5 kV |
| 5 kV | 1, 2, 3, 4, 5 kV |
· duration of each “step” adjustable from 30s to 5mins
· measurement result for each voltage step is stored in memory
Continuity measurement of protective connections and equipotential bonding with 200 mA current
Measurement range acc. to EN 61557-4: 0,12…999 Ω
| Range | Resolution | Accuracy |
| 0.00…19.99 Ω | 0,01 Ω | ±(2% m.v. + 3 digits) |
| 120.0…199.9 Ω | 0,1 Ω | |
| 200…999 Ω | 1 Ω | ±(4% m.v. + 3 digits) |
· Voltage on open terminals: 4…24 V
· Output current at R < 2 Ω: Imin > 200 mA (ISC: 200…250 mA)
· Compensation of test lead resistance
· Current flowing in both directions, mean value of resistance is displayed
Capacity measurement
| Range | Resolution | Accuracy |
| 1…999 nF | 1 nF | ±(5% m.v. + 5 digits) |
| 1.00…49.99 µF | 0.01 µF |
· Capacity measurement result is displayed after the RISO measurement
DC and AC voltage measurement
| Range | Resolution | Accuracy |
| 0.0…29.9 V | 0.1 V | ±(2% m.v. + 20 digits) |
| 30.0…299.9 V | 0.1 V | ±(2% m.v. + 6 digits) |
| 300…600 V | 1 V | ±(2% m.v. + 2 digits) |
The acronym “m.v.” stands for a “measured reference value”.

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