Using Voltmeter As A Continuity Tester - Maytag LAT2300 Service Manual

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120 VOLTS AC
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VOLTS AC 120 VOLTS AC
Using Voltmeter As A Continuity
Tester
CAUTION - - - - - - - - - - - - ,
Always disconnect power supply
before making continuity checks or
taking resistance readings.
While we normally think of continuity
testing as only an ohmmeter function, a
voltmeter can also be used, particularly
when testing switch contacts. The
primary difference is that power is
applied to the circuit under test and
appropriate caution MUST be exer-
cised.
The voltmeter is connected across the
component terminals with the wires still
in place and with power disconnected.
16001145
The meter is set for the 300 volt range
and power is reconnected. A voltage
reading indicates a voltage drop across
the component. There should be no
voltage drop across closed switch con-
tacts or fuses.
The voltmeter connected across ther-
mostat terminal, as an example, will
show no reading when the thermostat is
calling for heat and will show line
voltage when the thermostat cycles if
timer is in heat cycle.
This type of continuity testing is an
excellent method at locating question-
able switch contacts. Any voltage drop
across closed switch contacts indicates
poor electrical contact. The resultant
internal heating can shorten component
life.
SECTION 1. GENERAL INFORMATION
1-16
©1994 Maytag Corporation