Greenlee CMT-60 User manual

999 3757.5 © 2000 Greenlee Textron IM 1462 10/00
CMT-60
CLAMP-ON METER
MEDIDOR CON
PINZA
COMPTEUR A
PINCES
INSTRUCTION MANUAL
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 CMT-60 Digital Clamp-on Meter is a hand-held testing device
with the following measurement capabilities: AC and DC voltage, AC current,
and resistance. It also verifies 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
This instruction manual is intended to familiarize all personnel with the safe
operation and maintenance procedures for the Greenlee CMT-60 Digital
Clamp-on Meter.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
Greenlee and are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL

CMT-60
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 and fire hazard:
• Do not expose this unit to rain or moisture.
• Do not use the unit if it is wet or damaged.
• Inspect the test leads 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 can result in severe injury or death.
Electric shock hazard:
Contact with live circuits 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.

CMT-60
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.
• 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.
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 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. Jaw
2. Lever
3. Display
4. Selector
5. Common (COM) test lead
6. Positive test lead for voltage
and resistance (V-Ω)
7. Hold button
3
2 2
7
1
4
5 6
8
9
10
Display Icons
8. Hold Function
is enabled
9. Continuity
10. Low Battery
Symbols on the Unit
Warning—Read the instruction manual
Double insulation

CMT-60
7
Operation
1. See the Settings Table. Set the selector to the proper setting.
2. See 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. See the address shown under Warranty.
4. Take the reading from the circuit or component to be tested.
Note: Press the HOLD button to hold the present measurement on the
display; press again to return to the normal display mode
Settings Table
To measure this set the selector to a measurement range
characteristic … indicated by this symbol …
AC Current A
AC Voltage V
DC Voltage V
Continuity*
Resistance
*Refer to the Accuracy section for tone indications.

8
Typical Measurements
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
accurate measurement.
• Center the line splitter in the jaw for highest
accuracy.

CMT-60
9
Typical Measurements
Voltage Measurement
Resistance
Measurement
Continuity
Check

10
Accuracy
See the Specifications section for operating conditions and temperature
coefficient.
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
Characteristic Range Accuracy Frequency Range
AC Current 0 to 200.0 A ±(2% + 0.3 A) 50 to 60 Hz
AC Voltage* 0 to 600 V ±(1.5% + 3 V) 40 to 500 Hz
DC Voltage* 0 to 600 V ±(1% + 2 V) N/A
Resistance** 0 to 2000 Ω±(1% + 2 Ω)N/A
*Input impedance: 1.6 MΩ, 100 pF nominal
**Open circuit voltage: 3 V nominal
Continuity
Tone on: Circuit resistance is ≤25 Ω(approximately).
Tone off: Circuit resistance is ≥400 Ω(approximately).
Specifications
Display: 3-1/2-digit LCD
Maximum Conductor Size: 22 mm (0.87")
Sampling Rate: 2.5 per second
Automatic Power Off: After approximately 30 minutes
Temperature Coefficient: 0.2 x (Accuracy) per °C below 18 °C or above 28 °C
Overvoltage Protection Categories:
V-ΩTerminal: Category III, 600 VAC and 600 VDC
COM Terminal: Category III, 600 VAC and 600 VDC
Jaws: Category III, 600 VAC and 600 VDC
Operating Conditions:
0 °C to 30 °C (32 °F to 86 °F), 0% to 80% relative humidity
30 °C to 40 °C (86 °F to 104 °F), 0% to 75% relative humidity
40 °C to 50 °C (104 °F to 122 °F), 0% to 45% relative humidity
Indoor use only
Storage Conditions: –20 °C to 60 °C (–4 °F to 140 °F),
0% to 80% relative humidity
Remove battery
Elevation: 2000 m (6500') maximum
Pollution Degree: 2
Battery: 9 V battery (NEDA 1604, JIS 006P or IEC 6F22)