Automotive ET2134 Buku Petunjuk - Halaman 6

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7. POWER TOOLS AND AMALL

APPLIANCES

This test would also apply to other similar equipment that has

a line cord. For double insulated power tools, the

megohmmeter lead shown connected to the housing would

be connected to some metal part lf the tool(e..g chuck,blade).

Note:The switch of the device must be in the "ON"position

and the main power should be disconnected.

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 in dicated, the motor and other components

should be checked individually. 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. DC-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 individually, leaving the other connected to the

grounded motor housing. The above also applies to DC

Gemerators.