Megger CM500 - Specification; Measurement Specifications; Prospective Fault Current Calculation

Specification
31
SUPPLY VOLTAGE MEASUREMENT
25 - 500 V Intrinsic accuracy ± 2% ± 2 digits
SUPPLY FREQUENCY MEASUREMENT
d.c., 16 - 460 Hz Intrinsic accuracy ± 0,1% ± 1 digit
INSULATION RANGES (to EN 61557-2)
Nominal Test Voltages
250 V, 500 V, 1 kV into 1 mA load
Displayed Range 1 kΩ to 499 MΩ at 1 kV
Intrinsic accuracy ± 2% ± 2 digits
EN61557 Operating Range 0,10 MΩ to 99,9 MΩ
CONTINUITY RANGE (to EN 61557-4)
Displayed Range
0,01 Ω to 99,9 kΩ
Intrinsic accuracy ± 2% ± 2 digits
Open Circuit Voltage 4 V - 5 V
Test Current (0 - 2Ω) 200 mA - 250 mA
EN61557 Operating Range 0,10 Ω to 99,9 kΩ
LOOP AND EARTH ELECTRODE RESISTANCE
MEASUREMENT (to EN 61557-3 and EN 61557-5)
LINE / EARTH & EARTH ELECTRODE
Displayed range 0,01 Ω to 3,00 kΩ
Nominal Supply 230 V, 50 Hz
Supply Voltage range 100 - 280 V, 45 - 65 Hz
EN61557 Operating Range 0,25 Ω to 3,00 kΩ
Intrinsic accuracy
LINE
- LINE (Phase/Phase) LOOP RESISTANCE
MEASUREMENT (to EN 61557-3)
Displayed range 0,01 Ω to 19,99 Ω
Intrinsic accuracy ± 5% ± 0,03 Ω
Nominal Supply 230 V, 50 Hz
Supply Voltage range 100 - 480 V, 45 - 65 Hz
EN61557 Operating Range 0,25 Ω to 19,99 Ω
PROSPECTIVE FAULT CURRENT
Prospective fault current = Nominal voltage
Loop resistance
Prospective Fault Current is calculated from the respective loop
0,01 Ω - 9,99 Ω
10,0 Ω - 89,9 Ω
90 Ω - 899 Ω
900 Ω - 3,00 kΩ
± 4% ± 0,03Ω
± 5% ± 0,5Ω
±5% ±5Ω
± 5% ± 20Ω
Measured Voltage
> 150 V
150 V - 300 V
> 300 V
Nominal Voltage
110 V
230 V
400 V