Gardner Bender GMT-18A Manuel D'instructions page 5

GB 1764 GMT-18A 5/17/00 1:50 PM
voltage applied falls within the range of a lower setting, reset
the function/range switch to the appropriate setting for
greatest accuracy of reading.
3) If the polarity of the circuit to be tested is known, touch the
black test lead to the neutral side. If the polarity is unknown,
touch the test leads to opposite sides of the circuit. If the needle
indicator deflects to the left of the scale, reverse the test leads.
Use the chart below as a guide to reading DC voltage measurements:
DCV Read
range following multiply
setting scale reading by:
2.5 0-250 divide reading by 100
50 0-50
250 0-250
1000 0-10
5.0 DC MILLIAMP MEASUREMENT
1) Fully seat the test leads in the correct input jacks.
2) Set the function/range switch to the appropriate DCmA setting.
3) Touch the test leads to the circuit in series (in line with the circuit)
so that the circuit current passes through the multimeter in order
to make the measurement. If the needle indicator deflects to the
left, reverse the test leads. With a set range of 10mA, read the
0-10 scale. With a set range of 250mA read the 0-250 scale.
6.0 AC VOLTAGE MEASUREMENT
1) Fully seat the test leads in the correct input jacks.
2) Set the function/range switch to the appropriate AC voltage
range. If the 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
greatest accuracy of reading.
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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 following chart below as a guide to reading AC voltage
measurements:
ACV
range
setting
10
and
50
250
1000
7.0 RESISTANCE / CONTINUITY MEASUREMENT
1
For resistance and continuity testing POWER MUST BE OFF:
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1) Fully seat the test leads in the input jacks.
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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 one 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
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.
Read and
following multiply
scale reading by:
0-10 1
0-50 1
0-250 1
0-10 100
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