General Technologies CM1000 User Manual

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

General Technologies Corp.

600VCATII
300VCATIII

600A

H

HOLD

OFF

A

A

V

V

ZERO

P

H

A

600VCATII
300VCATIII

600V



P

PEAK

Press
2Sec

�

�

600VCATII
300VCATIII

600A

H

HOLD

OFF

A

A

V

V

ZERO

P

H

A

600VCATII
300VCATIII

600V



P

PEAK

Press
2Sec

�

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AUTO

P

H

A

V

Relative Indicator

AC/DC Indicator

Low Battery

Auto Power Off

Digital Reading

Ohm Indicator

Voltage Indicator

Ampere Indicator

Continuity

Data Hold

Peak Hold

CM1000

1000 Amp AC/DC Clamp Meter

1. SAFETY RULES

This meter is designed for indoor use at temperatures between 0°C to 40°C and

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altitudes up to 2,000m.

To ensure that the meter is used safely, follow all safety and operating instructions

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in this operation manual. If the meter is not used as described in this operation
manual, 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

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the meter is not operating properly.

When using the instrument, keep your ngers behind the nger guards on the

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plastic casing and probes.

Disconnect the live test lead before disconnecting the common test lead.

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Make sure power is off before cutting, desoldering, or breaking the circuit wires.

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Small amounts of current can be dangerous.

Do not apply more than 1000 VDC or 1000V AC rms between a terminal and

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ground.

To avoid electrical shock, use CAUTION when working above 60V DC or 25V AC

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rms. Such voltages pose a shock hazard.

Never make measurements with the battery cover off.

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To avoid electrical shock or damage to the meter, do not exceed the input limits.

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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 or AAA 1.5 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: 189 x 70 x 34 mm.
Weight: Approx. 220 g. (Including battery)
Accesories: User’s Manual, Soft Carrying Pouch, Test
Leads and 2 x AAA Alkaline Batteries

3.2 Electrical Specifications

The mark next to the probe tip, is a warning that the input voltage

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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

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test before operation.

Accuracies are ±(% of reading + number of least signicant digits) at

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23°C ±5°C, less than 75% RH.

Function Range Resolution Accuracy Remarks Overload Protection

DC Current

AC Current

DC Voltage

AC Voltage

Resistance 100K� 10 � ±(1%+3) - 660 Vrms

Continuity Beeps when < 1K� 3VDC Max. Test Voltage 660 Vrms

1000 A

1000 A

1000 V

1000 V

0.1 A ±(2.5%+10) - 1020 Arms

0.1 A ±(2%+10) 50~500Hz 1020 Arms

0.1 V ±(1%+2) - 1020 Vrms

0.1 V ±(1.5%+5) 50~500Hz 1020 Vrms

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

4.2 LCD Screen Description

4.3 Current Measurement

CAUTION: Remove all test leads connected to the instru-

ment 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

Set the function selector knob to (ACA). 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.

Wrong Right

4.4 Voltage Measurement

600VCATII
300VCATIII

600A

H

HOLD

OFF

A

A

V

V

ZERO

P

H

600VCATII
300VCATIII

600V



P

PEAK

Press
2Sec

�

600VCATII
300VCATIII

600A

H

HOLD

OFF

A

A

V

V

ZERO

P

H

600VCATII
300VCATIII

600V



P

PEAK

Press
2Sec







CAUTION: Maximum Input Voltage is 1000Vrms, do not

exceed this rating to avoid personal injuries or
damage to the instrument.

Battery

4.4.1 DC Voltage Measurement

Set the function selector knob to (DCV). Insert the red test lead 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 source or load under measurement. The polarity will be indicated when
the tip probe is connected. Read voltage in the display.

4.5.2 Continuity Test

Set the function selector knob to (Resistance). Insert the red test lead
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 100Ω,, the buzzer will emit a continuous tone.

4.6 Other Functions

4.6.1 Relative Measurements

By pressing the ZERO button, the instrument is entered into zero mode
and the indicator will appear on the LCD screen. The value in the
display immediately before pressing the button is stored into memory as
a reference value for future tests. To exit the Zero mode press the ZERO
button again.

4.6.2 Data Hold and Peak Hold

Pressing the HOLD/PEAK button once, the present reading is held and
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

indicator appears on the screen. When in this mode, the instrument will
hold and display the highest reading obtained during the measurement.
To exit the peak/hold mode press the HOLD button for approx. 2 sec. until
the display indicator turns off. This function works with DCV, ACV, DCA
and ACA.

4.4.2 AC Voltage Measurement

Set the function selector knob to (ACV). Insert the red test lead 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
source or load under measurement. Read voltage in the LCD screen

4.5 Resistance and Continuity Measurement

CAUTION: Maximum Input Voltage is 660Vrms, 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

Set the function selector knob to (Resistance). Insert the red test lead
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

4.6.3 Auto Power Off

The meter will turn off automatically after approx. 30 minutes of no operation
to extend the battery life. Auto power off can be disabled by pressing
and holding down the HOLD button while turning on the instrument, when
auto power is off, the symbol on the screen will not appear.

5. MAINTENANCE

CAUTION: Before attempting battery removal or replace-

ment, 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.

General Technologies Corp.

#121 - 7350 72nd Street Tel.: [phone]
Delta, BC Fax: [phone]
Canada V4G 1H9 www.generaltechnologies.net

© Copyright 2001 General Technologies