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GB 1764 GMT-18A
5/17/00
1:50 PM
3.0 OPERATING SUGGESTIONS
1) Set the function/range switch to the proper position before
making a measurement. When the voltage or current is not
known, it MUST be determined that the capacity of the
selected range will handle the amount of voltage or current in
the circuit (see For Your Safety section). Always start with the
highest range in the function. 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.
2) Avoid placing the tester in areas where vibration, dust or dirt
are present. Do not store the tester in excessively hot, humid
or damp places. This tester is a sensitive measuring device
and should be treated with the same regard as other electrical
and electronic devices.
3) Using the tester in areas with high magnetic fields can result
in inaccurate readings. For greatest accuracy of reading, lay
the tester flat on a non-metallic surface.
4) When the tester is not in use, keep the function/range switch
in the OFF position. This keeps the needle indicator from
deflecting or "bouncing" excessively.
5) When disconnecting the test leads from the unit, always grasp
the leads where the input jacks meet the tester housing. Never
pull the leads out of the jacks by the insulated wire or
transport the tester using the test leads as a carrying strap.
6) Never immerse the tester in water or solvents. To clean the
housing use a damp cloth with a minimal amount of mild soap.
7) If the resistance (ohms) function of the tester is not going to
be used for a week or more, remove the internal battery to
avoid potential leaks that may damage the unit.
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AC Voltage Scale
dB Scale for Transistor
Gain Measurement
3.1 Preliminary Adjustments
Fully seat the test leads in the correct input jacks. If necessary, using a
small flat tip screwdriver, slowly turn the mechanical zero adjustment
screw clockwise or counter-clockwise until the needle indicator is
directly over the three black zeros at the left end of the scale.
3.2 Check Condition of Internal Battery
Before making resistance or continuity tests, check the condition
of the internal battery. First turn the function/range switch to an
ohms position. Short the test leads together and the needle
indicator should deflect to the right side of the scale. Keep the test
leads shorted together while simultaneously turning the zero ohms
adjustment dial until the needle indicator reads zero at the right side
of the ohms scale. If the needle will not zero, replace the battery
with a new 1.5 volt AA size battery (see Battery Replacement).
4.0 DC VOLTAGE MEASUREMENT
1) Fully seat the test leads in the correct input jacks, (-) black
lead, (+) red lead.
2) Set the function/range switch to the appropriate DC voltage
range. If the voltage is unknown, use the highest range. If the
Resistance
(Ohms)
50
20
Scale
10
DC Voltage
& Milliamps
Scale
Common Markings
for both the AC & DC
Voltage Scales
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