GTC CM100 User manual

1. SAFETY RULES
•This meter is designed for indoor use at temperatures between 0°C to 40°C and
altitudes up to 2,000m.
•Toensurethatthemeterisusedsafely,followallsafetyandoperatinginstructionsin
thisoperationmanual.Ifthemeterisnotusedasdescribedinthisoperationmanual,
the safety features of this meter might be impaired.
•Do not use the meter if the meter or test leads look damaged ,or if you suspect that
the meter is not operating properly.
•Whenusingtheinstrument,keepyourfingersbehindthefingerguardsontheplastic
casing and probes.
•Disconnect the live test lead before disconnecting the common test lead.
•Makesurepowerisoffbeforecutting,desoldering,orbreakingthecircuitwires.Small
amounts of current can be dangerous.
•Do not apply more than 600 VDC or 600VAC rms between a terminal and ground.
•To avoid electrical shock, use CAUTION when working above 60V DC or 25V AC
rms. Such voltages pose a shock hazard.
•Never make measurements with the battery cover off.
•To avoid electrical shock or damage to the meter, do not exceed the input limits.
2. INTERNATIONAL SYMBOLS
Important information Dangerous Voltages
see manual Continuity
AC Ground
DC Double Insulation
3. TECHNICAL SPECIFICATIONS
3.1 General Specifications
Display: 4 digits LCD, 9999 counts and engineering units
annunciator display
Polarity: Automatic, (-) negative polarity indication
Zero adjustment: One touch button
Sample rate: 0.5 Sec.
Peak hold sample time: 10 mS for DCV and DCA
Over range indication: Only the “OL” is displayed
Power: 2x UM-4 orAAA1.5 Volt battery
Auto power off: Automatically powers off after 30 min. of
no operation
Battery life: Approx. 50 hours. (w/ alkaline batteries)
Clamp opening size: 25 mm maximum.
Dimension: 202 x 70 x 34 mm.
Weight: Approx. 180 g. (Including battery)
Accesories: User’s Manual, Soft Carrying Pouch,Test Leads
and 2 xAAAAlkaline Batteries
3.2 Electrical Specifications
•The mark next to the probe tip, is a warning that the input voltage should
not exceed the indicated values. This is to prevent damage to the internal
circuitry.
•The function switches should be set to the function which you want to test
before operation.
•Accuracies are ±(% of reading + number of least significant digits) at 23°C
±5°C, less than 75% RH.
4. OPERATION
4.1 INSTRUMENT DESCRIPTION
1) Current sensing clamp
2) Safety protection ring
3) Clamp opening handle
4) LCD Display
5) COM input terminal
6) Positive input terminal
7) Zero button
8) Function selection knob
9) Peak/Data hold button
Function Range Resolution Accuracy Remarks Overload Protection
DC Current 10 A 1mA ±(2.5%+10) - 150 Arms
100 A 10 mA
AC Current 10 A 1 mA ±(2%+10) 50~500Hz 150 Arms
100A 10 mA
DC Voltage 600 V 0.1 V ±(1%+2) - 660 Vrms
AC Voltage 600 V 0.1 V ±(1.5%+5) 50~500Hz 660 Vrms
Resistance 100K10 ±(1%+3) - 660 Vrms
Continuity Beeps when < 1K3VDC Max. Test Voltage 660 Vrms
4.2 LCD Screen Description
4.3 Current Measurement
CAUTION: Remove all test leads connected to the
instrument before proceeding with this test.
4.3.1 DC Current Measurement
Set the function selector knob to (DCA) and press the Zero button,
the will appear in the display. Open the clamp by pressing the clamp
opening handle, insert the cable or wire inside the current sensing clamp,
and then close the clamp and read from the LCD screen.
4.3.2 AC Current Measurement
Setthefunctionselectorknobto (ACA).Opentheclampbypressingthe
clamp opening handle, insert the cable or wire inside the current sensing
clamp, and then close the clamp and read from the LCD screen.
600V CATII
300V CATIII 600A
H
HOLD
OFF
A
A
V
V
ZERO
P
H
A
600V CATII
300V CATIII
600V
COM
1
2
3
4
5
8
9
7
6
P
PEAK
Press
2 Sec
Incorrect Correct
AUTO
P
H
A
V
Relative Indicator
AC/DC Indicator
Low Battery
Auto Power Off
Digital Reading Ohm Indicator
Voltage Indicator
Ampere Indicato
r
Continuity
Data Hold
Peak Hold
i
i
600VCATII 100A
H
H
HOLD
OFF
A
A
V
V
ZERO
P
H
A
600VCATII
300VCATIII
600V
COM
P
PEAK
Press
2 Sec
600VCATII 100A
H
HOLD
OFF
A
A
V
V
ZERO
P
H
A
600VCATII
300VCATIII
600V
COM
P
PEAK
Press
2 Sec
i
i
CM10 0

4.4 Voltage Measurement
CAUTION: Maximum Input Voltage is 600Vrms, do not
exceedthis rating toavoidpersonalinjuries or
damage to the instrument.
4.5.2 Continuity Test
Setthefunctionselectorknobto (Resistance).Inserttheredtestlead
into the positive input terminal (+), and the black test lead into the COM
terminal on the front of the instrument. Proceed to connect the test leads
tips across the component or circuit under test. If the resistance less is
than 100, the buzzer will emit a continuous tone.
4.6 Other Functions
4.6.1 Relative Measurements
BypressingtheZERObutton,theinstrumentisenteredintozeromodeand
the indicator will appear on the LCD screen. The value in the display
immediatelybeforepressingthebuttonisstoredintomemoryasareference
valueforfuture tests.ToexittheZeromode presstheZERObuttonagain.
4.6.2 Data Hold and Peak Hold
PressingtheHOLD/PEAKbuttononce,thepresentreadingisheldand
appears on the display. Press the switch again to return to normal mode
(continuous readings) and to release the data hold feature. The PEAK
HOLD function is enabled by pressing the HOLD/PEAK button until the
indicatorappearsonthescreen.Wheninthismode, theinstrumentwill
hold and display the highest reading obtained during the measurement.
Toexitthepeak/holdmode press the HOLDbuttonforapprox.2sec. until
the display indicator turns off. This function works with DCV, ACV, DCA
andACA.
4.6.3 Auto Power Off
Themeterwillturnoffautomaticallyafterapprox.30minutesofnooperation
to extend the battery life.Auto power off can be disabled by pressing
and holding down the ZERObuttonwhileturningontheinstrument,when
autopowerisoff,thesymbol onthescreenwillnotappear. Autopower
off will be re-enable after turning off and on the instrument.
5. MAINTENANCE
CAUTION: Before attempting battery removal or
replacement, disconnect test leads and
remove the instrument from any energized
circuit to avoid shock hazard.
5.1 Battery Replacement
When the battery needs replacement, the battery symbol will be
appear in the upper left hand side of the LCD display. To replace the
battery, remove the screws at the back cover and replace with a 2 AAA
1.5 V alkaline batteries.
5.2 Cleaning
Periodically wipe the case with a soft damp cloth and mild household
cleanser. Do not use abrasives or solvents. Ensure that no water gets
inside the instrument to prevent possible shorts and damage.
6. WARRANTY
One year limited warranty, excluding batteries and fuses. For details
see Standard Warranty Information in our webpage or you may request
a printed copy.
4.4.1 DC Voltage Measurement
Setthefunctionselectorknobto (DCV).Inserttheredtestlead intothe
positive input terminal (+), and the black test lead into the COM terminal
on the front of the instrument. Proceed to connect the test leads across
thesourceorloadundermeasurement.Thepolaritywillbeindicatedwhen
the tip probe is connected. Read voltage in the display.
4.4.2 AC Voltage Measurement
Setthefunctionselectorknobto (ACV).Inserttheredtestleadintothe
positive input terminal (+), and the black test lead into the COM terminal
on the front of the instrument. Proceed to connect the test leads across
the source or load under measurement. Read voltage in the LCD screen
4.5 Resistance and Continuity Measurement
CAUTION: Maximum Input Voltage is 600Vrms, do not
exceed this rating to avoid personal injuries
or damages to the instrument. Also ensure
there is no power applied to the circuit and
that all capacitors are discharged.
4.5.1 Resistance Measurement
Setthefunctionselectorknobto (Resistance).Inserttheredtestlead
into the positive input terminal (+), and the black test lead into the COM
terminal on the front of the instrument. Proceed to connect the test leads
across the component or circuit under test. Read resistance in Ohms on
the LCD screen
Battery
H
HOLD
OFF
A
A
V
V
ZERO
P
H
600V CATII
300V CATIII
600V
COM
P
PEAK
Press
2 Sec
V
+
-
600V CATII 100A
H
HOLD
OFF
A
A
V
V
ZERO
P
H
600V CATII
300V CATIII
600V
COM
P
PEAK
Press
2 Sec
Ω
600V CATII 100A
© Copyright 2017 General Technologies
General Technologies Corp.
#121 - 7350 72nd Street Tel.: [phone]
Delta, BC V4G 1H9 Fax: [phone]
Canada www.gtc.ca