How to Use Megger to Test Branch Circuit Wiring

Voltage Measurement

• 1

  Set the Megger multimeter to the "V AC" position by turning its dial.

• 2

  Insert the black test lead into the "COM" port and the red test lead into the "V" port.

• 3

  Connect the black test lead's alligator clip to the negative neutral wire. Connect the red test lead's alligator clip to the positive hot wire.

• 4

  Read the voltage in the circuit from the display on the multimeter.

Resistance Measurment

• 5

  Turn the function switch to the "Ω" position.

• 6

  Insert the black test lead into the "COM" port and the red test lead into the "Ω" port.

• 7

  Connect the black test lead's alligator clip to the negative neutral wire. Connect the red test lead's alligator clip to the positive hot wire.

• 8

  Read the resistance in the circuit from the display on the multimeter.

Frequency Measurements

• 9

  Turn the function dial to the "Hz" position.

• 10

  Insert the black test lead into the "COM" port and the red test lead into the "Hz" port.

• 11

  Connect the black test lead's alligator clip to the negative neutral wire. Connect the red test lead's alligator clip to the positive hot wire.

• 12

  Read the frequency in the circuit from the display on the multimeter.