Product Manual

4). Keeping the probes on the test points when release the TEST key.

7. POWER TOOLS AND SMALL APPLIANCES

The upper right display shows the measured resistance reading

and the circuit now discharges through the meter, while the

main display reading shows the decreasing voltage, keep the

probe touched to test points until the circuit is completely

discharged and the main display shows “-----“.

This test would also apply to other similar equipment that has a line cord.

For double insulated power tools, one leads of megohmmeter to be

connected to the housing. The other leads would be connected to some

metal part of the tool (e.g. chuck, blade).

The upper right display holds the resistance reading until a new

test is started or a different function is selected.

Note: The switch of the device must be in the “ON” position and the main

power should be disconnected.

6-2 Using the LOCK Function to Measure Insulation Resistance

The LOCK function holds the test voltage on the probes. Use

LOCK function to make long duration measurements, don’t need to

push and hold the TEST key.

1). Press and hold the TEST key, then press the LOCK key to enter

LOCK mode. In this mode, a potentially dangerous voltage is

continuously applied to the probes.

In this mode, if the probes are disconnected from the circuit, the

meter cannot discharge any potentially dangerous capacitive

voltages left on the circuit.

MOTORS

AC-Disconnect the motor from the line by disconnecting the wires at the

motor terminals or by opening the main switch. If the main switch is

used and the motor also has a starter then the starter must be held, by

some means, in the “ON” position. In the latter case, the measured

resistance will include the resistance of the motor, wire and all other

components between the motor and the main switch. If a weakness is

indicated, the motor and other components should be checked

individually.

Ensure that the circuit is de-energized before connecting the test

probes.

2). Press LOCK or TEST key to disable the Lock function.

If the motor is disconnected at the motor terminals, connect one

megohmmeter lead to the grounded motor housing and the other lead to

one of the motor leads.

Disconnect the motor from the line. To test the brush rigging, field coils

and armature connect one megohmmeter lead to the grounded motor

housing and the other lead to the brush on the commutator.

If the resistance measurement indicates a weakness, raise the brushes

off the commutator and separately test the armature, field coils and

brush rigging by connecting one megohmmeter lead to each of them