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Applications
Measuring Power Tools and Small Appliances
Testing AC Motors
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This section applies to any device under test that uses a line cord.
For double insulated power tools, the meter's leads should be
connected to the device's housing (chuck, blade, etc.) and to the
lines of the power cord. Refer to the diagram.
Disconnect the motor from the line by disconnecting the wires from the motor terminals or opening
the mains switch.
If the mains switch is opened, and the motor also has a motor-starter, then the starter must be held
in the ON position. With the mains switch opened, 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. If the motor
is disconnected at the motor terminals, connect one meter lead to the grounded motor housing and
the other lead to one of the motor leads. Refer to diagram at below.
Motor
Starter
GND
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Mains
Line
Switch
Notes:
1. The STARTER must be in the ON position during the
380363-en-GB_V-3.2 12/15
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