Appliance Receptacles; Circuit Breaker Panels; Resistance/Continuity Measurement - Gardner Bender GMT-12A Manuel D'utilisation

5A
Figure 6
contact cannot be made on the wall plate screw, remove the
wall plate and touch the electrical box with the test lead in
the same manner as before. The meter should read 120V
AC with one test lead touching the electrical box and the
other touching the live side of the receptacle. If not, the
receptacle is not properly grounded.

6.2 Appliance Receptacles

Set the function/range switch to 250V AC. Touch the test leads
to the receptacle slots. The meter should read 240V AC between
the two "hot" sides of the receptacle, and 120V AC between the
neutral slot and either of the two "hot" sides (see fig. 7).
Figure 7
6.3 Circuit Breaker Panel
To test for defective circuit breakers, set the function/range
switch to the 250V AC. Touch one test lead to the neutral
(buss) terminal strip of the breaker panel and the other test
lead to the terminal on the circuit breaker (see fig. 8). The
meter should read 120V AC on the 0-250 scale.
Figure 5
5B
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Figure 8

7. Resistance/Continuity Measurement

For resistance and continuity testing POWER MUST BE OFF:
1) Fully seat the test leads in the input jacks.
2) Set the function/range switch to the Rx1K position
(resistance indicated multiplied by 1000) and short the test
leads together. Using the zero ohms adjustment dial, slowly
turn the dial until the needle indicator reads -0- ohms at the
right end of the ohms scale. If the needle will not zero,
replace the internal battery with a new 1.5 volt AA size
battery (see Battery Replacement).
3) Touch the test leads to the resistance or non-energized
circuit to be measured. Measure the value of the reading on
the green ohms scale and multiply the reading by 1000. If
you're making basic continuity tests, the needle indicator
should move all the way to the right side of the ohms scale
if continuity exists.
Note: When switching the unit back and forth from ohms
to other functions, always zero the needle indicator before
taking another reading. Failure to zero the needle before
taking resistance/continuity measurements will result in
inaccurate readings.
Common Resistance and Continuity Measurements
Continuity tests are probably the most frequently performed
electrical troubleshooting procedures around the home.
ALWAYS REMEMBER THAT CONTINUITY CHECKS ARE
TO BE MADE WITH THE POWER TO THE CIRCUIT
TURNED OFF. Polarity of the test leads is not a factor in
making continuity checks.
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