Martindale Electric CM57 User manual
CM57 TRMS AC SMART
CLAMP MULTIMETER
InstructIon
Manual
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
CONTENTS
1 Safety Information 1
1.1 Meaning of Symbols and Markings 1
1.2 Precautions 2
2 Introduction 4
2.1 Inspection 4
2.2 Description 4
2.3 Accessories 5
2.4 Battery Installation 5
3 Operation 5
3.1 General 5
3.2 Low Battery Indication 5
3.3 Description of Clamp Meter Elements 6
3.4 Description of Press Buttons 6
3.5 Description of LCD Symbols 7
3.6 Auto Power Off 7
3.7 Backlight 8
3.8 Display Hold 8
3.9 Use of the TL16 Test Leads 8
3.10 AC Current Measurements 8
3.11 Voltage Measurements 9
3.12 Frequency Measurements 9
3.13 Resistance Measurements and Continuity Testing 9
3.14 Capacitance Measurements 10
3.15 Diode Testing 10
3.16 Use as a Non-contact Voltage Detector 11
4 Maintenance 12
4.1 Battery Replacement 12
4.2 Test Lead Replacement 12
4.3 Calibration 12
4.4 Cleaning 13
4.5 Repair & Service 13
4.6 Storage Conditions 13
5 Warranty 14
Measurement Categories 15
Specifications
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 Specications.
Please keep these instructions for future reference. Updated instructions
and product information are available at: www.martindale-electric.co.uk
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
conductors is permitted.
CAT II (Measurement Category II) is applicable to test and measuring
equipment connected directly to utilization points (socket outlets
and similar points) of the low-voltage MAINS installation.
CAT III (Measurement Category III) is applicable to test and measuring
equipment connected to the distribution part of the building’s
low-voltage MAINS installation.
1
CAT IV (Measurement Category IV) is applicable to test and
measuring equipment connected at the source of the building’s
low-voltage MAINS installation.
For further information on measurement categories see page
15 or visit www.martindale-electric.co.uk/measurement_
categories.php
Equipment complies with relevant directives
Equipment complies with relevant UK Conformity
Assessed marking
End of life disposal of this equipment should be in
accordance with relevant 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 the extra
low voltage (ELV) limit of 50V AC RMS or 120V 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
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.
If the clamp meter is used in a manner not specified by Martindale Electric,
the protection provided by the clamp meter may be impaired.
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.
When using test leads, always keep your fingers behind the finger guard
on the test lead probe.
3
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.
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 CM57 has a SMART function that automatically detects if
AC or DC voltage is being measured when set to the voltage function. The
SMART function also automatically determines if resistance or capacitance
is being measured or if a diode is being tested.
The Martindale CM55 has the following measurement functions:
• True rms AC current to 600A
• True rms AC voltage to 600V
• DC voltage to 600V
• Resistance to 6MΩ
• Capacitance to 600µF
4
• Frequency to 100kHz
• Continuity with audible indication
• Diode testing
Further functions are:
• Non-contact voltage detector
• Display hold
• Auto power off
• Auto ranging
• Display backlight
2.3 Accessories
The CM57 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 installation
instructions.
3. OPERATION
3.1 General
If the 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 batteries need replacing as
measurement accuracy can no longer be guaranteed (see section 4.1
Battery Replacement).
5
3.3 Description of Clamp Meter Elements
3.4 Description of Press Buttons
Selects backlight
Hz
Selects frequency measurement
HOLD
Selects display hold
1
Clamp current
sensing jaws
2
NCV sensing area
3
Clamp safety
protection barrier
4
Clamp trigger
5
Rotary function
selector switch
6
Backlight button
7
Frequency selector
button
8
Hold button
9Liquid crystal display
10 COM input terminal
11 Positive input
terminal
6
3.5 Description of LCD Symbols
Auto power off is activated
HDisplay hold is activated
Diode test function is selected
Continuity function is selected
SMART SMART function is active
Indicates AC measurement
Indicates DC measurement
A, V, Ω, kΩ, MΩ, Hz,
nF, µF Units of measurement being displayed
Indicates >30V present between terminals
Indicates low battery
3.6 Auto Power Off
If the clamp meter is inactive for a period of 10 minutes it will
automatically power off.
If any button is pressed after the clamp meter has automatically powered
off, the clamp meter will turn back on.
To disable the auto power off function hold the or Hz button at the same
time as turning the rotary switch from OFF to any position. The symbol
will no longer be displayed on the LCD.
Figure 1
7
3.7 Backlight
Press the button to turn on the backlight. Press again to turn the
backlight off. The backlight will automatically turn off after 30 seconds to
conserve the battery.
3.8 Display Hold
To hold a displayed value, press the HOLD button. The LCD will display
HOLD. Press again to exit display hold.
3.9 Use of the TL16 Test Leads
Before use, always check the continuity of the test leads.
Where access to test points may require extended probe tips, the probe tip
caps may be removed by gently pulling them forward until they unclip from
the probe body.
CAT III 1000V
CAT IV 600V
CAT II 1000V ONLY
DO NOT USE ON
CAT III or CAT IV
installations
3.10 AC Current Measurements
1. Set the rotary switch to the
A
position.
2. Taking all necessary safety precautions, press the clamp meter trigger
to open the clamp jaws, position the jaws around the conductor to be
measured, and release the trigger to close the jaws.
3. Position the clamp meter so the conductor is central within the
clamp jaws.
4. Read the measured ac current from the display.
Note. Clamping around more than one conductor will result in an incorrect
measurement.
8
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