Greenlee CM-410 User manual

52022032 REV 1 © 2006 Greenlee Textron Inc. 11/06
CM-410
Digital
Clamp-on Meter
Medidor digital
con pinza
Contrôleur
numérique
à pince
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 esta herramienta
o darle 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.

2
Description
The Greenlee CM-410 Digital Clamp-on Meter is a hand-held testing device
capable of measuring up to 400 amps of alternating current, in addition to
measuring AC or DC voltage, resistance, and checking continuity.
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-410
Digital Clamp-on Meter.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge:
www.greenlee.com.
KEEP THIS MANUAL
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.
Do not discard this product or throw away!
For recycling information, go to www.greenlee.com.

3
CM-410
Important Safety Information
Electric shock hazard:
Contact with live circuits could result in severe
injury or death.
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.
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.

4
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 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 or battery door open.
• Before opening the case or battery door, 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.

5
CM-410
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.
Important Safety Information
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.

6
Identification
1. Jaw
2. Lever
3. Selector switch
4. Display
5. Negative, common (COM), or
ground input terminal
6. Volts or resistance (V-Ω) input
terminal
7. Select/toggle button
8. Hold button
910111213141516
17
18
19
20
21
1
3
4
5
2
8
7
6
Symbols on the Unit
Warning—Read the instruction manual
Risk of electric shock
Double insulation
Battery
Recycle product in accordance with manufacturer’s directions
Display Icons
9. Hold function is enabled.
10. A Amps
11. V Volts
12. ΩOhms
13. k kilo (103)
14. M Mega (106)
15. Continuity mode
16. Auto ranging is enabled.
17. AC measurement is selected.
18. –Negative polarity indicator
19. DC measurement is selected.
20. Low battery indicator
21. O.L Overload indicator

7
CM-410
Using the Features
•Selector Switch
Slide switch to desired mode of operation:
(amps)
(AC/DC voltage)
(ohms/continuity)
Return switch to OFF position when not in use.
•Select/Toggle Button
Momentarily press button to select AC or DC voltage, ohms, or
continuity mode.
•Hold Button
Press momentarily to hold the present value on the display. will
appear on the display.
Press again to return to normal mode.
•Auto Power Off
The unit automatically shuts off after approximately 10 minutes of
inactivity.

8
Operation
1. Set the selector switch according to the Settings Table. Momentarily
press the select/toggle 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, send the unit to
Greenlee for repair. Refer to the instructions under the Warranty.
4. Take the reading from the circuit or component to be tested.
Settings Table
Electric shock hazard:
Contact with live circuits could result in severe
injury or death.
To measure
this value …
Connect
red lead
to …
Connect
black lead
to …
Momentarily press
the Select/Toggle
Button until this
icon appears
on the display …
Set the
Selector Switch
to this
symbol …
AC Amps* N/A N/AN/A
AC Voltage V-Ω COM
DC Voltage V-Ω COM
Continuity** V-Ω COM
Resistance V-Ω COM
M Ω
*AC Amp measurements are made using the jaw clamp. Refer to “Typical
Measurements”for specific measurement instructions.
**Tone indicates a circuit resistance of less than 20 Ω.

9
CM-410
Typical Measurements
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
accurate measurement.
•Center the line splitter in the jaw for
highest accuracy.
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.
AC Amps

10
Typical Measurements
Voltage