EXTECH MG500 [10/15] Application specific information

MG500-en-GB_v1.3 3/17

Application-Specific Information

Measuring Power Tools and Small Appliances

For small appliances, connect the GREEN (EARTH) lead to conductors and the RED (LINE) lead to

insulating material.

For single or double insulated power tools, one lead should be connected to the device’s chuck,

blade, etc. and the other lead to one of the AC power cord conductors (test both conductors in

turn). Refer to the power tool application diagram below.

AC Motor Test

Disconnect the motor from the line by:

a. Disconnecting the wires from the motor

terminals or,

b. Opening the main switch

If the main switch is opened, and the motor has a motor-starter, then the starter must be held in

the ON position. With the main switch opened, the measured resistance will include the

resistance of the motor wire and all of the 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 the RED lead to the

grounded motor housing and the GREEN lead to one of the motor leads.

Plug

For 2 or 3 prong plugs, connect the

RED lead to one conductor at a time

Connect the GREEN

lead to the chuck

Connect RED lead

to grounded housing

Connect GREEN lead

to the motor leads