11. Voltage measurement
WARNING : Voltage measurements are live circuit tests and all precautions for live working
must be followed.
Fig 29: Voltage
11.1 General
The MFT-X1 can measure single and three-phase AC voltages and DC voltages. Three measuring modes are available.
TRMS (true RMS) mode measures the combined value of the AC and DC voltages in a circuit.
AC mode measures only the AC voltage in the circuit and takes no account of any DC voltage that may be present.
DC measures only the DC voltage in the circuit and takes no account of any AC voltage that may be present.
Fig 30: Voltage single phase
WARNING : When using the MFT-X1 you should remember that if you have selected AC mode and the
reading is low or zero, the circuit could still have a potentially dangerous DC voltage present. Conversely,
if you have selected DC mode and the reading is low or zero, the circuit could have a potentially
dangerous AC voltage present.
The MFT-X1 can also measure millivolts as below:
Fig 31: Voltage mV
www.megger.com MFT-X1
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Voltage measurement
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