Greenlee CM-1200 Bedienungsanleitung

CM-1200

CLAMP-ON AMMETER

AMPERÍMETRO

CON PINZA

PINCE

AMPEREMETRIQUE

DCA ZERO

PEAK HOLD

AUTO POWER OFF

OFF

AC /DC 1000A

TRUE RMS

CLAMP

MULTIMETER

Ω

0.1A

1Ω

0.1V

20Hz

— 1000A

— 40kΩ

— 1000V

— 600V

— 10kHz

INSTRUCTION MANUAL

MANUAL DE INSTRUCCIONES

MANUEL D’INSTRUCTIONS

Read and understand all of the instructions and safety information

in this manual before operating or servicing this tool.

Lea y entienda todas las instrucciones y la información sobre

seguridad que aparecen en este manual, antes de manejar estas

herramientas o darles mantenimiento.

Lire attentivement et bien comprendre toutes les instructions et

les informations sur la sécurité de ce manuel avant d’utiliser ou de

procéder à l’entretien de cet outil.

Description

The Greenlee CM-1200 Clamp-on Ammeter is a true RMS-reading meter intended to measure

AC/DC current, resistance, AC/DC voltage, frequency and to verify continuity. The large,

easy-to-read 3-3/4-digit LCD display has a maximum reading of 3999.

Safety

Safety is essential in the use and maintenance of Greenlee tools and equipment. This

instruction manual and any markings on the tool provide information for avoiding hazards and

unsafe practices related to the use of this tool. Observe all of the safety information provided.

Purpose

This instruction manual is intended to familiarize all personnel with the safe operation and

maintenance procedures for the Greenlee CM-1200 Clamp-on Ammeter.

Keep this manual available to all personnel.

Replacement manuals are available upon request at no charge.

and are registered trademarks of Greenlee Textron.

KEEP THIS MANUAL

CM-1200

Important Safety Information

This symbol is used to call your attention to hazards or unsafe practices which could

result in an injury or property damage. The signal word, defined below, indicates the

severity of the hazard. The message after the signal word provides information for

preventing or avoiding the hazard.

SAFETY ALERT SYMBOL

Immediate hazards which, if not avoided, WILL result in severe injury or death.

Hazards which, if not avoided, COULD result in severe injury or death.

Hazards or unsafe practices which, if not avoided, MAY result in injury or property

damage.

Read and understand this material before operating or servicing

this equipment. Failure to understand how to safely operate this

tool can result in an accident causing serious injury or death.

Important Safety Information

Electric shock hazard:

Contact with live circuits can result in severe injury or death.

Electric shock hazard:

• Do not use the unit if it is wet or damaged.

• Use test leads or accessories that are appropriate for the application. See the

category and voltage rating of the test lead or accessory.

• Inspect the test leads or accessory before use. The item(s) must be clean and dry,

and the insulation must be in good condition.

Failure to observe these warnings can result in severe injury or death.

Electric shock hazard:

• Do not apply more than the rated voltage between any two input terminals, or

between any input terminal and earth ground.

• Do not contact the test lead tips or any uninsulated portion of the accessory.

Failure to observe these warnings can result in severe injury or death.

• Do not operate with the case open.

• Before opening the case, remove the test leads (or jaw) from the circuit and shut

off the unit.

Failure to observe these warnings can result in severe injury or death.

CM-1200

Do not change the measurement function while the test leads are connected to a

component or circuit.

Failure to observe this precaution can result in injury and can damage the instrument.

• Do not attempt to repair this unit. It contains no user-serviceable parts.

• Do not expose unit to extremes in temperature or high humidity. See Specifications.

Failure to observe these precautions can result in injury and can damage the instrument.

Unless measuring voltage, current or frequency, shut off and lock out power. Make

sure that all capacitors are discharged. Voltage must not be present.

Using this unit near equipment that generates electromagnetic interference can result

in unstable or inaccurate readings.

Identification

1. V Terminal

2. COM Terminal

3. Display

4. Lever

5. Jaw

6. Selector

7. Peak Hold Button

8. DCA Zero Button

9. Polarity Indication

DCA ZERO

PEAK HOLD

AUTO POWER OFF

OFF

AC /DC 1000A

TRUE RMS

CLAMP

MULTIMETER

Ω

0.1A

1Ω

0.1V

20Hz

— 1000A

— 40kΩ

— 1000V

— 600V

— 10kHz

CM-1200

Display Icons

10.

Low Battery

11. ΩOhms

12. kHz Kilohertz

13. Continuity

14. OL or -OL Overload

15. DC DC measurement is selected

16. AC AC measurement is selected

17. Peak Hold is enabled

18. True RMS reading is enabled

Symbols on the Unit

Read the instruction manual

Double Insulation

Battery

Risk of electric shock

kHz

17 12

11 13 18

Ω

AC Measurement

AC measurements are usually displayed as RMS (

root mean squared

) values. Two methods of

AC measurement are

average-responding RMS calibrated

and

true RMS-reading.

The average-responding RMS calibrated method takes the average value of the input signal,

multiplies it by 1.11, and displays the result. This method is accurate if the input signal is a

pure sine wave.

The true RMS-reading method uses internal circuitry to read the true RMS value. This method

is accurate, within the specified crest factor limitations, whether the input signal is a pure sine

wave, a square wave, sawtooth wave, half wave or signal with harmonics. The ability to read

true RMS provides much more measurement versatility. The CM-1200 is a true RMS meter.

The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.

Waveforms and Crest Factors

Waveform

RMS Value

Average Value

Crest Factor*

(ξ)

100 100 100 100

90 100 87 64

1.414 1 1.73 2

*The crest factor is the ratio of the peak value to the RMS value; it is represented by the

Greek letter ξ.

CM-1200

Operation

1. Set the selector according to the settings table.

Settings Table

Electric shock hazard:

Contact with live circuits can result in severe injury or death.

* Tone indicates a circuit resistance is less than 100Ω.

** Frequency can also be measured with the jaw.

2. See Typical Measurements for illustrations of typical uses.

3. Test the unit on a known functioning circuit or component.

• If the unit does not function as expected on a known functioning circuit, replace the

battery.

• If the unit still does not function as expected, send the unit to Greenlee for repair.

To measure set the connect the and the

this value … selector to red lead black lead

this symbol … to … to …

Continuity* KΩVΩCOM

Current (AC) A .N/A N/A

Current (DC) A N/A N/A

Frequency** Hz VΩCOM

Resistance KΩVΩCOM

Voltage (AC) V VΩCOM

Voltage (DC) V VΩCOM

4. Take the reading from the circuit to be tested.

• If it is a DC reading, remove the clamp from the circuit and press the DCA Zero button.

Clamp the jaw around the circuit again to measure the actual DC current.

• For the peak value:

Note: Position the jaws to obtain a positive reading on DC current before using

Peak Hold, otherwise a reading of Ø will result.

Note: If is pressed while taking a measurent, an incorrect reading may result.

a) Remove unit from circuit.

b) Press Peak Hold button until icon disappears.

c) Press DCA Zero (for a DC reading only).

d) Press Peak Hold. Wait for icon to appear.

Note: Display will show 0.00.

e) Connect unit to circuit.

f) Read peak measured reading.

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