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A multimeter is a device used in diagnosing
electrical problems. It can be used to test resistance and
to measure voltage. Resistance can be safely tested with the
power off. However, voltage can only be measured with the
power on. Because of the risk of electric shock, an individual
trained in the use of a voltage tester should only conduct
voltage tests.
Caution:
The tests described below should be done when current is NOT
present. Always unplug the device or turn off the main circuit
breaker before attempting these tests. Always test your test equipment for proper operation before use.
The common multimeter is a small handheld
device with an indicator needle over a measurement scale or
a numeric LCD display. The device has a switch to select the
type of test to be performed. A multimeter also has two wires,
one red (+) and one black (-), with metal tips. They are called
probes.
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