Greenlee CM-450 Manuale utente

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.

CM-450

Digital

Clamp-on

Meter

Medidor digital

con pinza

Contrôleur

numérique

à pince

CM-450

TRUE RMS

Description

The Greenlee CM-450 Digital Clamp-on Meter is a hand-held testing device

capable of measuring up to 600 amps of alternating current, in addition to

measuring AC or DC voltage, frequency, and resistance. It also checks diodes and

veriﬁes continuity. The CM-450 is a true RMS-reading meter.

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 of This Manual

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

operation and maintenance procedures for the Greenlee CM-450 Digital Clamp-on

Meter.

Keep this manual available to all personnel.

Replacement manuals are available upon request at no charge at

www.greenlee.com.

Do not discard this product or throw away!

For recycling information, go to www.greenlee.com.

All speciﬁcations are nominal and may change as design improvements occur.

Greenlee Textron Inc. shall not be liable for damages resulting from misapplication or misuse

of its products.

® Registered: The color green for electrical test instruments is a registered trademark of

Greenlee Textron Inc.

KEEP THIS MANUAL

Lifetime Limited Warranty

Greenlee Textron Inc. warrants to the original purchaser of these goods for use

that these products will be free from defects in workmanship and material for

their useful life, excepting normal wear and abuse. This warranty is subject to

the same terms and conditions contained in Greenlee Textron Inc.’s standard

one-year limited warranty.

For all Test Instrument repairs, contact Customer Service at 800-435-0786

and request a Return Authorization.

For items not covered under warranty (such as items dropped, abused, etc.), a

repair cost quote is available upon request.

Note: Prior to returning any test instrument, please check replaceable

batteries or make sure the battery is at full charge.

CM-450

SAFETY ALERT SYMBOL

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.

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 could result in an accident causing

serious injury or death.

Electric shock hazard:

Contact with live circuits could result in severe injury or

death.

Important Safety Information

Electric shock and ﬁre hazard:

Do not expose this unit to rain or moisture.

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

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

to the category and voltage rating of the test lead or accessory.

Inspect the test leads or accessory before use. They must be clean and dry,

and the insulation must be in good condition.

Use this unit for the manufacturer’s intended purpose only, as described in

this manual. Any other use can impair the protection provided by the unit.

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

•

Electric shock hazard:

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 could result in severe injury or death.

•

Electric shock hazard:

Using this unit near equipment that generates electromagnetic interference

can result in unstable or inaccurate readings.

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

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

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

•

CM-450

Important Safety Information

Electric shock hazard:

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

Do not expose the unit to extremes in temperature or high humidity. Refer to

“Speciﬁcations.”

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

unit.

•

Electric shock hazard:

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

a component or circuit.

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

Statement of Conformity

Greenlee Textron Inc. is certiﬁed in accordance with ISO 9000 (2000) for our

Quality Management Systems.

The instrument enclosed has been checked and/or calibrated using equipment

that is traceable to the National Institute for Standards and Technology (NIST).

Identiﬁcation

1. Jaw

2. Position error marks

3. Jaw center marks

4. Lever

5. Hold button

6. Relative measurement button

7. Display

8. Select button

9. Frequency button

10. Selector switch

11. Negative, common (COM), or ground input

terminal

12. Volts or resistance (VΩ) input terminal

Display Icons

13. Auto ranging is enabled.

14. Diode test

15. Continuity mode

16. Hold function is enabled.

17. Low battery indicator

18. ∆ Relative measurement is enabled.

19. MMega (106)

20. ΩOhms

21. Hz Hertz

22. kkilo (103)

23. AAmps

24. VVolts

25. mmilli (10-3)

26. O.L. Overload indicator

27. –Negative polarity indicator

28. AC measurement is selected.

29. DC measurement is selected.

Symbols on the Unit

Warning—Read the instruction manual

Risk of electric shock

Double insulation

Recycle product in accordance with manufacturer’s directions

Note: Unidentiﬁed icons are

not used on this model.

13 1514 16 17

242526

CM-450

Using the Features

Selector Switch

Slide switch to desired mode of operation:

AC voltage

DC voltage

AC current

ohms/continuity/diode

Return switch to OFF position when not in use.

Select Button (SELECT)

Momentarily press to select resistance, continuity, or diode test when the

Selector switch is set to .

Frequency Button (Hz)

Press to measure frequency.

Note: The sensitivity of the frequency measurement function varies with the

measurement range. To automatically select a sensitivity level, measure the

voltage level ﬁrst, and then press Hz. Pressing Hz before making a measurement

may give higher sensitivity. Reading may be zero when sensitivity is too low.

Electrical noise may cause unstable readings.

Hold Button (HOLD )

Press momentarily to hold the present value on the display. will appear on

the display.

Press again to return to normal mode.

Relative Measurement Button (∆)

This feature ﬁnds the difference between two measurements.

While taking a measurement, press ∆to set the display to zero. ∆ will appear

on the display.

Take the second measurement. The value on the display will be the difference

between the two measurements.

Press again to exit this mode.

Auto Power Off

To extend battery life, the meter will shut itself off after approximately 30 minutes

of inactivity. To restore power, press any button.

•

AC Measurement

AC measurements are usually displayed as RMS (root mean square) values. The

RMS value is equal to the value of a DC waveform, which would deliver the same

power if it replaced the time-varying waveform. Two AC measurement methods

are average-responding RMS calibrated and true RMS-reading.

The average-responding RMS calibrated method takes the average value of the

input signal after full wave rectiﬁcation, 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, square wave, triangle wave, half wave, or signal

with harmonics. The ability to read true RMS provides much more measurement

versatility. The Greenlee CM-450 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 100 100 100 100

Average

Value 90 100 87 64

Crest Factor*

(x)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 x.

CM-450

Operation

Electric shock hazard:

Contact with live circuits could result in severe injury or

death.

1. Set the Selector switch according to the Settings Table. Momentarily press the

SELECT button to select mode.

2. Refer to “Typical Measurements” for speciﬁc measurement instructions.

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, call Greenlee for technical

assistance at 800-435-0786.

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

Settings Table

To measure

this value …

Set the Selector

switch to this

symbol …

This icon

will appear

on the

display …

Connect

red lead

to …

Connect

black

lead

to …

AC Current*

(600 A max.) and AN/A N/A

Frequency of a

current

(600 A max.)

and press Hz Hz N/A N/A

Voltage

(600 V max.)

and V

+ COM

and V

Frequency of a

voltage signal or

and press Hz Hz + COM

Resistance MΩ + COM

Continuity**

and press SELECT Ω+ COM

Diode

and press SELECT

2 times and V+ COM

* AC current measurements are made using the jaw.

** Tone indicates continuity. The threshold is between 5 Ω and 120 Ω.

•

Typical Measurements

AC Amps

Clamp Around Wire

Notes:

Clamp the jaw around

one conductor only.

Close the jaw completely to

ensure accurate measurement.

Center the wire in the jaw for

highest accuracy.

•

Clamp Around Line Splitter

Notes:

The Greenlee 93-30 Line Splitter is divided.

One section renders amps; the other

renders amps multiplied by 10.

Close the jaw completely to ensure accu-

rate measurement.

Center the line splitter in the jaw for

highest accuracy.

•

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