GB Instruments GCM-221 User manual
Analog Multitester
Owners Manual Model #GMT-12A
GCM-221
Autoranging Digital Clamp Meter
Medidor de abrazadera digital
de autoreglaje
Pince ampèremétrique
• 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
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
GCM-221 11/29/04 10:39 AM Page 1
Contents
1. Meter Functions
2. Specifications
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
1
GCM-221 11/29/04 10:39 AM Page 2
2
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
1. Meter Functions
LCD display
Data hold
button
COM input
terminal
Function
select dial
Safety
protection ring
Positive input
terminal
Current
Sensing Clamp
Clamp
opening
handle
GCM-221 11/29/04 10:39 AM Page 3
3
2. Specifications
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: 32oF - 104oF (0oC - 40oC)
Storage Temperature: 14oF - 140oF (-10oC - 60oC)
31⁄2Digit LCD Display
Recessed Input Jacks: Negative (-) input jack for black test lead, positive
(+) input jack for red test lead.
Batteries: Two - "AAA"
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.
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.
!WARNING
GCM-221 11/29/04 10:39 AM Page 4
4
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. 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.
!WARNING
!WARNING
!WARNING
!WARNING
GCM-221 11/29/04 10:39 AM Page 5
3.1 Instrument Familiarization:
Symbol Definition:
3.2
Measuring Resistance:
Switch the function selector to Ωrange.
Connect red test lead to "+" terminal and black one to
the "COM" terminal.
Connect tip of the test leads to the points where the
value of the resistance is needed.
Read the result from the LCD panel.
Note: When taking measurements from a circuit,
make sure the power is off and all capacitors
are discharged.
H
V
A
Ω
AC Symbol
Low Battery
Digital Reading
Data Hold
Continuity
Voltage Indicator
Ampere Indicator
Ohm Indicator
5
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
GCM-221 11/29/04 10:39 AM Page 6
6
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
Beeper
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
xx
3.3 Testing Continuity:
Switch the function selector to Ωrange.
Connect red test lead to "+" terminal and black one to
the "COM" terminal.
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.
GCM-221 11/29/04 10:39 AM Page 7
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 V~range.
Connect red test lead to "+" terminal and black one to
the "COM" terminal.
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.
7
3.5 Measuring AC AMPS:
Switch the function selector to A~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.
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
GCM-221 11/29/04 10:39 AM Page 8
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.
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600VCAT II
300VCAT III
!
!
600V
GCM-221
00
CORRECT
✔
!
H
HOLD
OFF
A
V
Ω
AA
VV
Ω
Ω
0 - 400
0 - 600
0 - 200
H
+
COM
600V CAT II
300V CAT III
!
!
600V
GCM-221
oo
INCORRECT
✗
8
GCM-221 11/29/04 10:39 AM Page 9
Contenidos
1. Funciones del Polímetro
2. Especificaciones
2.1 Para Su Seguridad
3. Sugerencias de Funcionamiento
3.1 Medición de la Resistencia
3.2 Medición del Voltaje de CA y CC
3.3 Medición de la Intensidad de CA A
3.4 Medición de Voltaje CA
3.5 Medición de la Intensidad CA
4. Cambio de pilas
11
GCM-221 11/29/04 10:39 AM Page 11
Table of contents
Languages:
