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voltage is unknown, use the highest range.
If the voltage applied falls within the range
of a lower setting, reset the function/range
switch to the appropriate setting for
greater accuracy.
3) Touch the test leads to the circuit under
test. With AC voltage, the polarity of the
test leads is not a factor.
Use the chart below as a guide to reading
AC voltage measurements:
AC V
Read
and
range
following
multiply
setting
Gb Instruments Gmt-319 User Manual
scale
reading by:
Gb Instruments Gmt-319 Instructions
10
0-10
1
50
0-50
1
250
0-250
1
500
0-50
10
Common AC Voltage Measurements
6.1 Wall Receptacles
If the receptacle is controlled by a switch, make
sure the switch is ON. Set the function/range
switch to 250V AC. Touch the test leads to the
“hot” and “neutral” slots of the receptacle (see
fig. 3A). The needle indicator should read 120V
AC on the 0-250 scale. To test for proper
grounding of the receptacle, touch one test lead
to the “hot” (narrow) side of the receptacle, and
the other test lead to the ground slot. The meter
should read 120V AC as before.
Gmt 319 Instruction Manual
7. Resistance/Continuity Measurement
For resistance and continuity testing POWER
MUST BE OFF:
1) Fully seat the test leads in the input jacks (-)
black lead, (+) red lead.
2) Set the function/range switch to the desired
position 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 non-rechargeable 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 1/10/100. 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.
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
Figure 3
3A
3B
Gmt-319 Instructions
GMT-318 6-09 manual.qxp 6/8/09 2:03 PM Page 12