GB GCM-500 User Manual [en, es, fr]
Analog Multitester
Owners Manual Model #GMT-12A
Analog Clamp Meter
Polímetro Analógico
de Abrazadera
Pince De Mesure Analogique
• Read this owners manual
thoroughly before use
and save.
• Lea atentamente este manual
del propietario antes de
utilizar y guardar.
• Lisez ce manuel entièrement
avant utilisation et rangez-le
soigneusement.
Gardner
Bender
COM
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Ω
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60V
300V
600V
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1k
GCM-500
2
COM
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0V
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60V
300V
600V
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1. Meter Functions
Needle
Analog
Scale
Zero Ohms
Adjustment
Dial
Input Jacks
Function/
Range
Selector
Switch
Contents
1. Meter Functions
2. Specifications
2.1 For Your Safety
3. Operating Suggestions
3.1 Measuring Resistance
3.2 Measuring AC & DC Volts
3.3 Measuring AC Amps
4. Battery and Fuse Replacement
1
Figure 1
Battery/
Fuse
Cover
Mechanical
Zero Adjust
Screw
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.
4
!
WARNING
!
WARNING
!
WARNING
!
WARNING
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.
3
!
WARNING
6
Measuring AC & DC Volts
Note: Voltage measurements can only be made using the
test leads and not the clamp-around jaws.
Set the function/range dial to the appropriate AC or DC
voltage setting. Place the leads across the circuit under test
and read the middle scale on the analog display. For proper
voltage measurements multiply the reading on the scale by
the chart below.
Measuring AC Amps
Set the dial to the proper AMPS range and open the jaws.
Note that the jaws will only open when in the AMPS range.
Place the jaws around a single conductor, either the hot or
neutral wire, and read the measurement on the display. Note
that the jaws must not be clamped around two wires or a false
measurement will occur.
5
4) Never immerse the meter in water or solvents. To clean
the housing use a damp cloth with a minimal amount of
mild soap.
Analog Meter:
Reading the Scale
LOCKjaw™: This special feature does not allow the jaws to
open when the dial is in the OHMS or Voltage settings.
The jaws are only used for taking amperage readings.
3.1 Measuring Resistance
Before making resistance or continuity tests, check the
condition of the internal battery. First turn the function/range
switch to the 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 scale. If the needle will not zero, replace the battery
with a new 1.5 volt AA size battery.
Resistance
(Ohms)
Scale
AC Current
Scale
CO
M
V
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Ω
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A
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Ω
1
k
AC/DC
Voltage
Scale
Range Multiple Reading
Setting on Scale By
60V DC 10
60V AC 10
300V AC 50
600V AC 100
COM
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Ω
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AX
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60V R
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0V
30
0
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6
00
V
6
0
0A
6
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A
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A
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Ω
1
k
R
ed Lead
B
la
ck
L
ea
d
0
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A
1
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V
Ω
∞
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1k
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