Gardner Bender GCM-221 User manual
• 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.
GCM-221
Autoranging
Digital Clamp Meter
Medidor de abrazadera
digital de autoreglaje
Pince ampèremétrique
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Contents
1. Meter Functions
2. Specications
2.1 For Your Safety
3. Operating Suggestions
3.1 Instrument Familiarization
3.2 Measuring Resistance
3.3 Testing Continuity
3.4 Measuring AC Volts
3.5 Measuring AC Amps
4. Changing The Battery
5. Sleep Mode
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1. Meter Functions
Current
Sensing Clamp
Safety
Protection Ring
Clamp
Opening Handle
LCD Display
Black
Negative
Input Jack
Data
Hold Button
Function
Select Dial
Red Positive
Input Jack
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2. Specications
Ranges: Autoranging
AC Voltage: 600 Volts
AC Current: 600 Amps
Resistance (Ohms): 200 Ohms
Accuracy: AC voltage +/- 1.5%
AC current +/- 2.0%
Resistance +/- 1.0%
Function/Range switch: 4 functions
4 positions
Sample Rate: 2 times / sec
Operation Temperature: 32°F - 104°F (0°C - 40°C)
Storage Temperature: 14°F - 140°F (-10°C - 60°C)
31⁄2Digit LCD Display
Recessed Input Jacks: Negative (-) input jack for black test lead,
positive (+) input jack for red test lead.
Batteries: Two 1.5V AAA (non-rechargeable) batteries
Dimension: 187 mm x 67 mm x 31.5 mm
Weight: 180g (Battery Excluded)
Important:
Read this operators manual thoroughly before using this meter.
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.
!WARNING 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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2.1 For Your Safety
1) Use extreme caution when checking electrical circuits.
2)
!WARNING Do not stand in wet or damp work areas
when working with electricity. Wear rubber-soled boots
or shoes.
3) !WARNING Do not apply more voltage or current than
the set range of the meter will allow.
4) !WARNING 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) !WARNING 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. 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).
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.
4) Never immerse the meter in water or solvents. To clean
the housing, use a damp cloth with a minimal amount of
mild soap.
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3.1 Instrument Familiarization
Symbol Denition
3.2 Measuring Resistance
Switch the function selector to Ωrange.
Connect the red test lead to the red input jack and the
black lead to the black input jack.
Connect tip of the test leads to the points where the
value of the resistance is needed.
Read the result from the LCD panel.
!WARNING When taking measurements from a circuit,
make sure the power is off and all capacitors
are discharged.
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3.3 Testing Continuity
Switch the function selector to Ωrange.
Connect the red test lead to the red input jack and the
black lead to the black input jack.
Connect tip of the test leads to the points where tests
need to be made.
If the resistance is under 100Ω, the beeper will
sound continuously.
!WARNING When taking continuity measurements
from a circuit, make sure the power is off and all
capacitors are discharged.
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3.4 Measuring AC Volts
Note: Voltage measurements can only be made using
the test leads and not the clamp-around jaws.
Switch the function selector to range.
Connect the red test lead to the red input jack and the
black lead to the black input jack.
Measure the voltage by touching the test lead tips to
the circuit where the value of voltage is needed.
Read the result from the LCD panel.
3.5 Measuring AC AMPS
Switch the function selector to range.
Open the jaws by pressing the handle and insert the
cable to be measured into the jaw. Close the clamp
and note the reading on the LCD.
Note: Never clamp the Jaws around two wires as this
will cause inaccurate readings. Only clamp Jaws around
a single wire — either the HOT or NEUTRAL WIRE.
Note: When the display is hard to read, push the hold
button to freeze the reading.
V
~
A
~
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4. Changing The Battery
1. When the battery voltage drops below proper
operating range, the symbol will appear on the
LCD display and the battery needs to be changed.
2. Before changing the battery, switch the function
selector to “OFF” and disconnect test leads. Open
the back cover by removing the two screws. Replace
old batteries with two AAA size batteries.
3. Close the back cover and fasten the screws.
CORRECT
INCORRECT
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