Insulation testFunctionRangeAccuracy1000 V0.001 – 999 MΩ±3% ±2 digits500 V0.001 – 500 MΩ±3% ±2 digits> 500 MΩ±10%250 V0.001 – 250 MΩ±3% ±2 digits> 250 MΩ±10%100 V0.001 – 100 MΩ±3% ±2 digits> 100 MΩ±10%50 V0.001 – 50 MΩ±3% ±2 digits> 50 MΩ±10%VAR50 V – 999 VLeakage current > 1 mA±3% ±2 digitsLeakage current < 1 mA±10%Leakage current0.1 μA – 1.99 mA±10%Output voltage-0% +2% +2 V at rated load or lessVoltage display±1% ± 3 VShort circuit current1.5 mA nominalTest current on load1 mA at min pass values of insulationMaximum capacitance2 μF for a stable reading, 5 μF absolute limitEN61557-2 Measurement Range: 0.10 MΩ to 999 MΩ.Loop 2-Wire - No RCD (L-PE, L-N or L-L)FunctionRangeAccuracy2-Wire HR0.001 – 9.999±2% ±0.030 Ω2-Wire0.01 Ω - 9.99 Ω±2% ±5 digits10.0 Ω - 99.9 Ω±10% ±5 digits100 Ω - 1999 Ω±10% ±5 digitsSupply Voltage48 V – 550 VSupply Frequency45 Hz – 65 HzCan be used to measure supply source resistance quickly and reliably between Line and PE or two Live conductors up to 550 V.EN61557-3 Measurement Range: 0.30 Ω to 1999 ΩLoop 2-Wire L-PE with RCD FunctionRangeAccuracy0.01 Ω - 1999 Ω±10% ±5 digitsSupply Voltage48 V – 280 VSupply Frequency45 Hz – 65 HzNote: Uses the Megger Confidence Meter to measure the supply source impedance of circuits protected with an RCD rated ≥30 mA when there are only two connections possible. When a neutral is available the three-wire test will provide a quicker, more accurate result.Note: RCD may trip if there are high leakage currents in the circuit under test. This measurement is immune to the effect of inductance found in some RCDs as it measures resistance (RCD Uplift). EN61557-3 Measurement Range: 1.00 Ω to 1999 ΩMFT-X1Multifunction testerwww.megger.com 6
