Greenlee CMF-110 User manual
52086151 REV1 © 2019 Greenlee Tools, Inc. 1/19
Flex Clamp Meters
INSTRUCTION MANUAL
CMF-110
CMF-118
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
2
Table of Contents
Description ....................................................................................................2
Safety............................................................................................................2
Important Safety Information......................................................................3–5
Identication..................................................................................................6
Display Icons .................................................................................................7
Operation.................................................................................................8–10
Typical Measurements and Accuracy .....................................................11–12
Specications..............................................................................................12
Measurement Categories.............................................................................13
Statement of Conformity..............................................................................13
Maintenance................................................................................................13
Description
The Greenlee CMF-110 and CMF-118 Flex Clamp Meters are hand-held testing devices
that measure AC current, AC voltage, resistance, and frequency. These meters are
designed to be placed on or removed from insulated or uninsulated conductors.
Safety
Safety is essential in the use and maintenance of Greenlee tools. 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.
CMF-110 • CMF-118
3
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, dened 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
Do not discard this product or throw away!
For recycling information, go to www.greenlee.com.
All specications are nominal and may change as design improvements occur. Greenlee Tools, 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 Tools, Inc.
KEEP THIS MANUAL
4
Important Safety Information (cont.)
Electric shock and re hazard:
• Do not expose this unit to rain or moisture.
• Do not use the unit if it is wet or damaged.
• Clamp meter, test leads or any other clamp accessory, when used to make a
measurement, create a System. The System is rated for CAT IV 600V when using
the test leads or accessories provided with the meter. The System CAT and voltage
rating is limited by the lowest rated component in the System when using test leads
or accessories not provided with the meter.
• Inspect the test leads or accessory before use. They must be clean and dry, and
the insulation must be in good condition. Do not use the test lead if the contrasting
inner layer of insulation is visible.
• Use this unit for the manufacturer’s intended purpose only, as described in this
manual. Anyotheruse 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 apply more than the rated voltage between any two input terminals, or
between any input terminal and earth ground.
• Keep hands and ngers below the barriers on the test leads and the clamp
meter body.
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 from the circuit and shut off the unit.
Failure to observe these warnings could result in severe injury or death.
CMF-110 • CMF-118
5
Important Safety Information (cont.)
Electric shock hazard:
• Unless measuring voltage, current, or frequency, shut off and lock out power. Make
sure that all capacitors are discharged. Voltage must not be present.
• Set the selector and connect the test leads so that they correspond to the intended
measurement. Incorrect settings or connections can result in incorrect measure-
ments or damage to the unit.
• Using this unit near equipment that generates electromagnetic interference can
result in unstable or inaccurate readings.
Failure to observe these warnings could result in severe injury or death.
Electric shock hazard:
• Do not change the measurement function while the test leads are connected to a
component or circuit.
Failure to observe these precautions may result in injury and can damage the unit.
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 “Specications.”
Failure to observe these precautions may result in injury and can damage the unit.
6
Identication
1. Rogowski Coil - The measurement coil of ex clamp meter
2. Clamp Lock - Turn the knob counter-clockwise to unlock the clamp; turn
clockwise to lock the clamp.
3. LCD - Displays measurement data and function modes
4. "HOLD "/ - Press to turn ON/OFF hold mode. Press and hold to turn
the unit ON/OFF.
5. " " and " INRUSH " - Press to turn ON/OFF backlight. Press and hold for 2
seconds to turn ON/OFF inrush measurement mode
6."RANGE" and "Hz" - Press to switch between 30.00A/300.0A/3000A/Auto;
The Default is Auto
7. Power and Range Shift Switch: Set to A for current measurement, V for AC voltage
measurement, and Ω for resistance measurement.
8. Voltage and Resistance Measurement Input:
Maximum AC voltage measurement is 600V, maximum resistance is 60MΩ
Symbols on the Unit
7
6
5
4
3
8
2
1
Double Insulation Low Battery
Grounding AC/DC
Warning High Voltage Danger
AC Complies with European
Union Standards
DC ETL Standard Certication
Figure 1
CMF-110 • CMF-118
7
Display Icons
Symbol Description Symbol Description
INRUSH 80 ms inrush measurement Unit A, Hz, V, Ω, kΩ, MΩ
Buzzer APO Auto Power Off
Low Battery Data hold
Double Insulation Low Battery
Grounding AC/DC
Warning High Voltage Danger
AC Complies with European
Union Standards
DC ETL Standard Certication
Figure 2
8
Operation
Electric shock hazard:
Contact with live circuits could result in severe injury or death.
Keep your hands away from the Rogowski coil and conductor to be measured.
Disconnect all power supplies from the device before measurement. When measuring
uninsulated conductors, do not power on the wire to be tested until the meter has
safely clamped the wire.
1. Turn off the clamp as well as the conductor being measured.
2. Unlock the clamp according to Figure 3
3. Use the measuring head to wrap around the conductor to be measured and lock it
in place. (Only one wire can be tested at a time; See Figure 4)
4. Turn on the clamp and adjust the slider to measure current, then turn on
the conductor to be measured.
5. Read the value displayed on the LCD. If the current to be measured is over
the range, OL appears on the LCD. Please select the appropriate range.
(30.00A/300.0A/3000A)
6. Improper operation examples:
a. Do not test more than one conductor at a
time as shown in as shown in Figure 5
b. Do not attempt to twist, bend, or wrap the coil
of the CMF-110/118 as shown in Figures 6, 7, and 8.
c. Do not attempt to pull on or apply a force to the
coil of the CMF-110/118
2
1
Figure 5
Figure 3 Figure 4
CMF-110 • CMF-118
9
Operation (cont.)
Figure 6
Figure 8
Figure 7
10
Operation (cont.)
AC Voltage and Frequency Measurement
1. Insert the black test lead to the COM jack, and the red test
lead to the V jack.
2. Switch the functional switch to the V position
3. Press and hold RANGE to turn on frequency measurement mode,
otherwise skip to step 4.
4. Connect the test leads to the voltage to be tested (Figure 9)
and the meter will automatically select the range. The main
display will show the AC voltage RMS and the auxiliary display
will show the frequency value.
Do not input over AC 600V.
Resistance Measurement
1. Insert the black test lead to the COM jack and the red test lead
to the V jack
2. Switch the functional switch to the Ω position
3. Connect the test leads to the resistance to be tested (Figure 10)
and the meter will automatically select the range. The main display
will show the resistance value.
Before measuring, please disconnect the power supply and
fully discharge all capacitors. The result will be more accurate
if the resistor is separated from the whole circuit.
Auto Power Off
During measurement, if there is no operation within 10 minutes,
the meter will power off automatically to save energy. Press the
and RANGE buttons at the same time to turn ON/OFF the APO function.
The APO function is active by default.
Figure 9
Figure 10
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