CM79
TRMS AC/DC CLAMP METER
INSTRUCTION
MANUAL
1. SAFETY INFORMATION: Always read before proceeding.
REMEMBER: SAFETY IS NO ACCIDENT
These instructions contain both information and warnings that are necessary
for the safe operation and maintenance of this product. It is recommended
that you read the instructions carefully and ensure that the contents are
fully understood. Failure to understand and to comply with the warnings and
instructions can result in serious injury, damage or even death.
Particular attention should be paid to the Warnings, Precautions and Technical
Specifi cations.
Please keep these instructions for future reference. Updated instructions and
product information are available at: www.martindale-electric.co.uk
ALWAYS READ THESE INSTRUCTIONS BEFORE PROCEEDING
Thank you for buying one of our products. For safety and a full understanding of its benefits
please read this manual before use. Technical support is available from 01923 441717 and
support@martindale-electric.co.uk
CONTENTS
1 Safety Information 1
1.1 Meaning of Symbols and Markings 1
1.2 Precautions 2
2 Introduction 5
2.1 Inspection 5
2.2 Description 5
2.3 Accessories 5
2.4 Battery Installation 5
3 Operation 6
3.1 General 6
3.2 Low Battery Indication 6
3.3 Description of Clamp Meter Elements 6
3.4 Description of Press Buttons 7
3.5 Description of LCD Symbols 7
3.6 Auto Power Off 7
3.7 Backlight 8
3.8 Display Hold 8
3.9 Zero Function 8
3.10 Min/Max Function 8
3.11 Use of the TL16 Test Leads 9
3.12 AC Current Measurements 9
3.13 DC Current Measurements 10
3.14 AC Voltage Measurements 10
3.15 DC Voltage Measurements 10
3.16 Resistance Measurements and Continuity Testing 11
4 Maintenance 12
4.1 Battery Replacement 12
4.2 Test Lead Replacement 12
4.3 Calibration 13
4.4 Cleaning 13
4.5 Repair & Service 13
4.6 Storage Conditions 14
5 Warranty 15
Measurement Categories 17
Specifications
1.1 Meaning of Symbols and Markings
Caution - risk of danger & refer to instructions
Caution - risk of electric shock
Equipment protected by double or reinforced insulation
(Class II)
Application around and removal from hazardous live
CAT II (Measurement Category II) is applicable to test and measuring
CAT III (Measurement Category III) is applicable to test and measuring
CAT IV (Measurement Category IV) is applicable to test and measuring
For further information on measurement categories see page 17 or visit
www.martindale-electric.co.uk/measurement_categories.php
End of life disposal of this equipment should be in
conductors is permitted.
equipment connected directly to utilization points (socket outlets
and similar points) of the low-voltage MAINS installation.
equipment connected to the distribution part of the building’s lowvoltage MAINS installation.
equipment connected at the source of the building’s low-voltage
MAINS installation.
Equipment complies with relevant EU Directives
accordance with relevant EU Directives
1.2 Precautions
This product has been designed with your safety in mind, but
please pay attention to the following warnings and cautions before
use.
Warnings
In order to avoid the danger of electrical shock, it is important that
proper safety measures are taken when working with voltages
exceeding 30V AC rms, 42V AC peak or 60V DC.
Where applicable other safety measures such as the use of
protective gloves, goggles etc. should be employed.
The clamp meter must only be used by a skilled and competent
person who is familiar with the relevant regulations, the safety risks
involved and the consequent normal safe working practices, and
under the conditions and for the purposes for which it has been
constructed and specified.
Before each use the clamp meter and any associated test leads
and accessories should be examined for damage, cracks, cuts or
scratches. Do not use if damaged in any way.
2
1
Make sure the clamp meter and test leads are dry, clean and free
from dust, grease and moisture while in use to avoid the danger
from electric shock due to surface leakage.
Always test this unit on an appropriate proving device or a known
good voltage source before and after using it to determine if a
hazardous voltage exists in a circuit to be tested. Do not use the
unit if it does not function correctly during proving.
Measuring/testing for a voltage/current that exceeds the specified
limits of the unit may damage the unit and may expose the operator
to a shock hazard. Always check the unit’s specified limits before
use.
As a clamp meter or multimeter the unit must only be used on
CAT III and CAT II installations up to 600V to earth, and within the
operating temperature and humidity range specified.
If the removable probe tip caps are not fitted to the probes of the
test leads, their measurement category becomes CAT II 1000V,
and they must not be used on CAT III or CAT IV installations to
avoid the risk of shorting high energy circuits and arc flash.
When this unit is used in combination with test leads, the
measurement category of the combination is the lower
measurement category of either this unit or the test leads used.
Likewise if test lead accessories such as crocodile clips are also
used, the measurement category will be the lowest measurement
category in that combination.
Do not use if the battery compartment cover is not fitted.
2. INTRODUCTION
2.1 Inspection
Examine the shipping carton for any sign of damage. Inspect the
unit and any accessories for damage. If there is any damage then
consult your distributor immediately.
2.2 Description
The Martindale CM79 has the following measurement functions:
True RMS AC current to 600A
DC current to 600A
True RMS AC voltage to 600V
DC voltage to 600V
Resistance to 1000:
Continuity with audible indication
Further functions are:
Display hold
Min/Max indication
Auto power off
Display backlight
2.3 Accessories
The CM79 comes with the following accessories:
Carrying case
Set of TL16 test leads
2 x 1.5V AAA batteries
Instructions
2.4 Battery Installation
Refer to section 4.1 (Battery Replacement) for the battery
3
installation instructions.
5
When using test leads, always keep your fingers behind the finger
guard on the test lead probe.
When positioning the clamp jaws around a hazardous live conductor
always keep your fingers behind the clamp safety protection barrier.
When making current measurements using the clamps, disconnect
the test leads from the clamp meter terminals.
Cautions
Avoid severe mechanical shock or vibration and extreme temperature.
When using test leads avoid excessive stresses to the cable entry
points at the probe and 4mm plug connector.
To avoid possible corrosion from leaking batteries, remove the
batteries when the unit is not in use for an extended period.
3. OPERATION
3.1 General
If the insulation clamp meter displays OL then the measurement
limits of the range have been exceeded.
3.2 Low Battery Indication
If the
symbol is displayed, the battery needs replacing as
measurement accuracy can no longer be guaranteed (see section
4.1 Battery Replacement).
3.3 Description of Clamp Meter Elements
1
Clamp current sensing jaws
2
Clamp safety protection barrier
3
Clamp trigger
4
Rotary function selector switch
5
Min/Max and Zero button
6
Backlight button
7
Hold button
8
Liquid crystal display
9 COM input terminal
10 Positive input terminal
11 Positive input terminal
Figure 1
4
6
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