Greenlee CM-600 User manual

INSTRUCTION MANUAL
999 4555.0 © 2001 Greenlee Textron IM 1520 REV 1 9/01
CM-600 • CM-650
CLAMP-ON METERS
Read and understand all of the instructions and safety
information in this manual before operating or servicing
this tool.

2
Description
The Greenlee CM-600 and CM-650 Clamp-on Meters are versatile clamp-on meters intended to
measure AC current, AC voltage, resistance and to verify continuity. These units also have data
hold capability. In addition, the CM-650 is a true RMS reading meter.
Safety
Safety is essential in the use and maintenance of Greenlee tools and equipment. This 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-600 and CM-650 Clamp-on Meters.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
KEEPTHIS MANUAL

CM-600 • CM-650
3
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.

4
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. They 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.
Electric shock and fire hazard:
• Do not expose this unit to rain or moisture.
• 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 can result in severe injury or death.

CM-600 • CM-650
5
Important Safety Information
• 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.
Using this unit near equipment that generates electromagnetic interference can result
in unstable or inaccurate readings.
Set the selector and connect the test leads so that they correspond to the intended
measurement. Incorrect settings or connections can result in a blown fuse.
Unless measuring voltage, current or frequency, shut off and lock out power. Make sure
that all capacitors are discharged. Voltage must not be present.
• 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.
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.

6
Identification
1. Display
2. Selector
3. Lever
4. Jaw
5. Hold button
6. COM terminal
7. V-Ωterminal
8. Battery Cover
9. Battery Cover Screw
Display Icons
10. Hold function is enabled.
11. — Polarity Indicator
12. Low Battery
13. l Overload Indication
Symbols on the Unit
Read the instruction manual
Double Insulation
Battery
5
6
4
2
1
7
3
9
8
Front Back
10
11
12
13

CM-600 • CM-650
7
*The crest factor is the ratio of the peak value to the RMS value; it is represented by the
Greek letter ξ.
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 Greenlee CM-600 is an average-responding meter.
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, half wave or signal with harmonics. The ability to read true
RMS provides much more measurement versatility. The Greenlee CM-650 is a true RMS meter.
The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.
Waveforms and Crest Factors
mrofevaW
eulaVSMR 001001001001
eulaVegarevA 090017846
*rotcaFtserC (ξ)414.1137.12

8
Operation
Electric shock hazard:
Contact with live circuits can result in severe injury or death.
1. Set the selector according to the Settings Table.
Settings Table
*Tone indicates circuit resistance is less than 50 Ω.
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.
4. Take the reading from the circuit to be tested.
5. Press HOLD to hold the measured value on the display.
Auto Power Off
When the meter is powered on, a timer is activated that will turn the unit off after approxi-
mately 30 minutes. To continue making measurements after the unit automatically powers off,
switch the selector to OFF and then back to the desired function.
To measure set the selector connect the and connect the
this value … to this symbol … red lead to … black lead to …
AC Voltage VV-ΩCOM
AC Current 200 A N/A N/A
(200 A max.)
AC Current 600 A N/A N/A
(200 A to 600 A)
Continuity ΩV-ΩCOM
Resistance* ΩV-ΩCOM

CM-600 • CM-650
9
Typical Measurements
Clamp Around Line Splitter
Clamp Around Wire
Notes:
•Clamp the jaw around one conductor only.
•Close the jaw completely.
•Center the wire in the jaw for highest
accuracy.
Notes:
•The Greenlee 93-30 Line Splitter is divided.
One section renders amps; the other renders
amps multiplied by 10.
•Close the jaw completely.
•Center the line splitter in the jaw for highest
accuracy.

10
Accuracy
Accuracy is specified as follows: ±(a percentage of the reading + a fixed amount)
at 23 °C ±5 °C (73.4 °F ±9 °F), 0% - 75% relative humidity.
See the Specifications section for operating conditions.
* Maximum open circuit voltage: 1 V
Continuity
Threshold: Tone sounds if the measured resistance is less than approximately 50 Ω,
and turns off when greater than approximately 300 Ω.
For the CM-600, AC accuracy is specified for sine waves only.
For the CM-650, accuracy specification applies for waveforms with crest factors less than 2.
•For crest factors from 2 to 3, add 1.4% to accuracy.
•For crest factors from 3 to 4, add 3% to accuracy.
Value Range Accuracy Frequency Input
Range Impedance
AC Voltage 0 to 600 V ±(1.2% + 3 V) 40 to 500 Hz 2 MΩ
2 nF
AC Current 0 to 199.9 A ±(1.9% + 0.5 A) 50/60 Hz N/A
(200 A range)
AC Current 0 to 400 A ±(1.5% + 5 A) 50/60 Hz N/A
(600 A range) 400 to 600 A ±(2.5% + 5 A) 50/60 Hz
Resistance* 0 to 2000 Ω±(1.5% + 2 Ω) N/A N/A

CM-600 • CM-650
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Specifications
Display: 3-1/2-digit LCD (1999 maximum reading)
Sampling Rate: 4 per second
Low Battery Indication:
Jaw Opening: 35 mm (1.38")
Maximum Conductor Diameter: 33 mm (1.30")
Overvoltage Category: Category III, 600 V
Temperature Coefficient: 0.2 x (specified accuracy) per °C below 18 °C or above 28 °C
Operating Conditions: 0 °C to 45 °C (32 °F to 113 °F), 0% to 75% relative humidity
Storage Conditions: -20 °C to 60 °C (-4 °F to 140°F), 0% to 80% relative humidity
Remove battery
Altitude: 2000 m (6500’) maximum
Pollution Degree: 2
Battery: 9-Volt battery (NEDA 1604, JIS 006P or IEC 6LF22)
Battery Replacement
1. Disconnect the unit from the circuit. Turn the unit OFF.
2. Remove the battery cover screw.
3. Remove the battery cover.
4. Replace the battery (observe polarity).
5. Replace the cover and screws.
Cleaning
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives
or solvents.
Before opening the case, remove the test leads (or jaw) from the circuit and shut off
the unit.
Failure to observe this warning can result in severe injury or death.

Lifetime Limited Warranty
Greenlee 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’s standard one-year limited warranty.
For all Test Instrument repairs, ship units Freight Prepaid to:
Greenlee Textron, 4411 Boeing Drive, Rockford, IL 61109-2932 USA.
Mark all packages: Attention TEST INSTRUMENT REPAIR. For items not covered under warranty (such as
dropped, abused, etc.), repair cost quote available upon request.
Note: Prior to returning any test instrument, please check replaceable batteries or make sure the battery is at full charge.
For technical assistance: 800/435-0786
Greenlee Textron / Subsidiary of Textron Inc.
4455 Boeing Drive, Rockford, IL 61109-2988 USA
Technical / Customer Service (International): 815/397-7070 • Fax: [phone]
Customer Service (North America): 800/435-0786 • USA Fax: [phone]
Canada Fax: [phone]
www.greenlee.textron.com Printed in Taiwan