Greenlee CM-1000 User manual

999 3267.9 © 1999 Greenlee Textron IM 1411 7/99
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
— 1200A
— 40kΩ
— 1000V
— 600V
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.
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.
Lea y entienda todas las instrucciones y la información sobre
seguridad que aparecen en este manual, antes de manejar estas
herramientas o darles mantenimiento.
CM-1000
CLAMP-ON
AMMETER
PINCE
AMPEREMETRIQUE
AMPERÍMETRO
CON PINZA

2
Description
The Greenlee CM-1000 Clamp-on Ammeter is intended to measure AC current, AC and DC
voltage, resistance, 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-1000 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-1000
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.
Electric shock hazard:
Contact with live circuits can result in severe injury or death.

4
Important Safety Information
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-1000
5
Important Safety Information
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 the unit to extremes in temperature or high humidity.
See Specifications.
Failure to observe these precautions can result in injury and can damage the unit.
Unless measuring voltage or current, 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.

6
Identification
1. Input Terminals
2. Display
3. Lever
4. Jaw
5. Selector
6. Hold Button
Display Icons
7. Low Battery
8. k Kilo (103)
9. ΩOhms
10. m Milli (10–3)
11. V Volts
12. A Amps
13. OL Overload (numeric display)
14. – Polarity Indicator
15. DC measurement is selected.
16. AC measurement is selected.
17. Hold Function is enabled.
Symbols on Unit
Read the instruction manual.
Double Insulation
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
—1200A
—40kΩ
—1000V
—600V
4
5
6
3
2
1
k ΩVmA
16
15
7
17 8 9 10 11 12
1314

CM-1000
7
Operation
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, return the unit to Greenlee for repair.
4. Take the reading from the circuit to be tested.
Note: Press HOLD to hold the present value on the display.
1. Set the selector according to the Settings Table.
Settings Table
To measure set the selector connect the and connect the
this value …to this symbol …Red lead to …Black lead to …
Continuity* V ΩCOM
Current AN/A N/A
Resistance V ΩCOM
Voltage (AC) VV ΩCOM
Voltage (DC) VV ΩCOM
* Tone indicates circuit resistance is less than 100 Ω.
Electric shock hazard:
Contact with live circuits can result in severe injury or death.

8
Typical Measurements
Clamp Around Line SplitterClamp Around Wire
Voltage Measurement
Current Measurement
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
—1200A
—40kΩ
—1000V
—600V
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
—1200A
—40kΩ
—1000V
—600V
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.
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
—1200A
—40kΩ
—1000V
—600V

CM-1000
9
Resistance Measurement
Continuity Check
Typical Measurements
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
—1200A
—40kΩ
—1000V
—600V
HOLD
AC 1200A
AUTO POWER OFF
V
V
A
OFF
V
V
A
0.1V
0.1V
0.1A
1Ω
—1200A
—40kΩ
—1000V
—600V

10
Accuracy
See the Specifications section for operating conditions.
Accuracy is specified as follows: ±(a percentage of the reading + a fixed amount)
at 23 °C ±5 °C (73.4 °F ±9 °F), 0% to 80% relative humidity.
Accuracy Table
eulaVegnaRycaruccA ycneuqerF
egnaR
tupnI
ecnadepmI
tnerruC
A9.93)A8.0+%9.1(±
zH06ot05desUtoNA9.993)A5.0+%9.1(±
A0021)A5+%9.2(±
ecnatsiseR k999.3)9+%0.2(± A/NA/N
k04)09+%0.2(±
)CA(egatloV V9.993)V5.0+%2.1(± zH005ot04 M11
xamFp001
V006)V5+%2.1(±
)CD(egatloV V9.993)V5.0+%7.0(± desUtoN M11
xamFp001
V0001)V5+%7.0(±