Gardner Bender GCM-500 Clamp-On Multimeter - Manual (Page 3)

2.1 For Your Safety
1) Use extreme caution when checking electrical circuits.
2) Do not stand in wet or damp work areas when
working with electricity. Wear rubber-soled boots or shoes.
3) Do not apply more voltage or current
than the set range of the meter will allow.
4) Do not touch the metal probes of the test
leads when making a measurement.
5) Replace worn test leads. Do not use test leads with
broken or tattered insulation.
6) Discharge a capacitor before measuring it.
7) Remove the test leads from the circuit being measured as
soon as the test is completed.
8) Do not measure voltage when the
function/range switch is set on the resistance (ohms) range.
Never measure current when the meter is set on the
resistance range. Never measure AC voltage when the
meter is set on DC voltage. Setting the meter on the
incorrect function may burn out some of the internal circuitry
and may pose a safety hazard.
3. 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 #3 under For Your Safety). Always start
with the highest range in the function. If the reading falls
within the range of a lower setting, reset the function/range
switch to the appropriate setting for greater accuracy.
2) Avoid placing the meter in areas where vibration, dust or
dirt are present. Do not store the meter in excessively hot,
humid or damp places. This meter is a sensitive
measuring device and should be treated with the same
regard as other electrical and electronic devices.
3) Using the meter in areas with high magnetic fields can
result in inaccurate readings. For greatest accuracy, lay
the meter flat on a non-metallic surface.
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2. Specifications
Ranges: 8 measuring ranges
DC Voltage: 60 Volts
AC Voltage: 60-300-600 Volts
AC Current: 6-60-600 Amps
Resistance (Ohms): 1K OHM
Accuracy: DC voltage = 4% full scale of range
AC voltage = 5% full scale of range
AC current = 5% full scale of range
Resistance = 4° arc of scale length
Sensitivity: 2300 OHMS per AC Volt, 2500 OHMS per DC Volt
Function/Range switch: 4 functions
8 positions
Zero Ohms Adjustment Dial: Located on the right side of the housing;
dial is used to zero the needle indicator on the
ohms scale while shorting the test leads together.
Mechanical Zero
Adjustment Screw:
Adjusts needle indicator to read zero
at the left side of the scale before taking
any measurement.
Recessed Input Jacks: Negative (-) input jack for black test lead, positive
(+) input jack for red test lead.
Fuse: .5 Amp/250 Volt
Battery: One “AA”
Important:
Read this operators manual thoroughly before using this
multimeter. This manual is intended to provide basic
information regarding this meter and to describe common test
procedures which can be made with this unit. Many types of
appliance, machinery and other electrical circuit
measurements are not addressed in this manual and should
be handled by experienced service technicians.
Use extreme caution when using this
meter. Improper use of this meter can result in severe
damage to property, severe personal injury or death.
Follow all instructions and suggestions in this operators
manual as well as observing normal electrical safety
precautions. Do not use this meter if you are unfamiliar
with electrical circuits and proper test procedures.
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