MARTINDALE ELECTRIC CM55 AC Clamp Meter Instruction Manual

CM55
AC CLAMP METER
InstructIon Manual

CM55 AC Clamp Meter

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 +44 (0)1923 441717 and support@martindale- electric.co.uk

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 Specifications.
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.
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 14 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.
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.
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.

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 CM55 has the following measurement functions:

• AC current to 400A
• AC/DC voltage to 600V
• Resistance to 400Ω
• Continuity with audible indication

Further functions are:

• Display hold
• Auto power off
• Auto ranging on AC & DC Voltage and AC current functions

2.3 Accessories
The CM55 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.

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).

3.3 Description of Clamp Meter Elements

3.4 Description of Press Buttons

HOLD Selects display hold
3.5 Description of LCD Symbols

| Indicates low battery
---|---
AUTO| Indicates auto ranging
HOLD| Display hold is activated
| Auto power off is activated
A, V, Ω| Units of measurement being displayed
| Indicates AC measurement
| Indicates DC measurement
| Continuity function is selected

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, press the HOLD button at the same time as turning the rotary switch from OFF to any position. Press the HOLD button again and the symbol will no longer be displayed on the LCD.

3.7 Display Hold
To hold a displayed value, press the HOLD button. The LCD will display HOLD. Press again to exit display hold.

3.8 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.

3.9 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 meaured, 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.

3.10 AC Voltage Measurements

1. Connect the black test lead to the terminal and the red test lead to the terminal.
2. Set the rotary switch to the position.
3. Taking all necessary safety precautions connect the test leads to the circuit being measured and read the measured ac voltage from the display.

3.11 DC Voltage Measurements

1. Connect the black test lead to the terminal and the red test lead to the  terminal.
2. Set the rotary switch to the  position.
3. Taking all necessary safety precautions connect the test leads to the circuit being measured and read the measured dc voltage from the display.

3.12 Resistance Measurements and Continuity Testing

1. Connect the black test lead to the terminal and the red test lead to the terminal.
2. Set the rotary switch to the Ω position.
3. Taking all necessary safety precautions connect the test leads to the circuit being measured and read the measured resistance from the display.

If the resistance is <25Ω, the buzzer will sound continuously.

MAINTENANCE

4.1 Battery Replacement
**** To avoid shock or injury, disconnect the clamp meter from any external circuits and remove the test leads before proceeding.

Referring to figure 2, the battery compartment is underneath the unit and can be accessed by removing the screw and lifting off the cover.
Fit 2 new 1.5V, AAA alkaline batteries (IEC LR03, NEDA 24A) observing correct polarity.
Replace the battery compartment cover and screw.

Note: Do not mix old and new batteries.

4.2 Test Lead Replacement
If the test leads become damaged they should be replaced.

The replacement test leads must have the same (or better) overvoltage category rating as the TL16 test leads supplied.

4.3 Calibration
To maintain the integrity of measurements made using your instrument, Martindale Electric recommends that it is returned at least once a year to an approved Calibration Laboratory for recalibration and certification.
Martindale Electric is pleased to offer you this service.
Please contact our Service Department for details.
Email: service@martindale-electric.co.uk
Tel: +44 (0)1923 650660

4.4 Cleaning
**** To reduce the risk of surface leakage, this instrument must be kept in a clean condition.
Prior to cleaning, ensure that the instrument is disconnected from any voltage source.

If contamination is found, clean with a damp soft cloth and if necessary a mild detergent or alcohol. Do not use abrasives, abrasive solvents, or detergents which can cause damage to the unit. If a mild detergent is used, the unit should subsequently be thoroughly cleaned with a water dampened soft cloth. After cleaning, dry and allow to remain in a dry environment for 2 hours before use.

4.5 Repair & Service
There are no user serviceable parts in this unit other than those that may be described in section 4. Return to Martindale Electric if faulty. Our service department will quote promptly to repair any fault that occurs outside the guarantee period.

Before the unit is returned, please ensure that you have checked the unit, batteries, leads and for poor connections.

4.6 Storage Conditions
The instrument should be kept in warm dry conditions away from direct sources of heat or sunlight, and in such a manner as to preserve the working life of the unit. It is strongly advised that the unit is not kept in a tool box where other tools may damage it.

WARRANTY AND LIMITATION OF LIABILITY

This Martindale product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is 2 years and begins on the date of receipt by the end user. This warranty extends only to the original buyer or end-user customer, and does not apply to fuses, disposable batteries, test leads or to any product which, in Martindale’s opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation, handling or storage.
Martindale authorised resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different  warranty on behalf of Martindale.
Martindale’s warranty obligation is limited, at Martindale’s option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is  returned to Martindale within the warranty period. This warranty is the buyer’s sole and exclusive remedy and is in lieu of all other warranties, expressed or implied, including but not limited to any implied warranty of merchantability or fitness for a particular purpose.
Martindale shall not be liable for any special, indirect, incidental or consequential damages or losses, including loss of data, arising from any cause or theory.
Since some jurisdictions do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any part of any provision of this warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision or other part of that provision. Nothing in this statement reduces your statutory rights.

MEASUREMENT CATEGORIES

CAT Ratings
BS EN61010-1 Installation Categories (CAT ratings) define the risks from hazardous transient impulses and potentially lethal short circuit currents on the mains supply system based on where you are working.
Voltage Ratings
Test equipment used for measuring mains circuits will have a CAT rating to show where it can be used. Each category also has a voltage rating to show the maximum safe phase to earth system voltage, normally 50V, 100V, 150V, 300V, 600V or 1000V.

Stay safe – Match your test equipment safety rating to the installation category.
CAT II: Socket outlets and similar points of the mains installation.
CAT III: The distribution part of the building’s mains installation.
CAT IV : The supply side source of thbuilding’s mains installation.
Testers, leads and accessories all need safety ratings equivalent to, or higher than the installation category and voltage rating for the location to be safe.

ELECTRICAL
All specified accuracies are at 23°C ± 5°C, <80% RH for 1 year.
Temperature coefficient:
add 0.1 x (specified accuracy) per °C. (0°C to 18°C, 28°C to 40°C).
All accuracies below are expressed as ± (percentage of reading + digits)

DC Voltage

Overload protection: 660V DC or AC rms
AC Voltage

Overload protection: 660V DC or AC rms

AC Current

Range| Resolution| Accuracy (50 to 60Hz)| Accuracy (60 to 400Hz)
---|---|---|---
40V| 0.01A| 1.9% + 3| 3.0% + 5
400V| 0.1A

Overload protection: 660A DC or AC rms
Resistance and Continuity

Range| Resolution| Open circuit voltage| Accuracy| Audible indication
---|---|---|---|---
400 Ω| 1Ω| -1.5V dc| 1.0% + 2| <25Ω

Overload protection: 600V DC or AC rms

GENERAL
Display: 3¾ digit liquid crystal display with maximum reading 3999 Sample rate 2 times/sec
Polarity: Automatic, positive implied, ‘-‘ for negative polarity indication
Overrange: (OL) is displayed
Power: 2 x 1.5V, AAA alkaline batteries (IEC LR03, NEDA 24A)
Battery life (alkaline): 500 hours typical for ACV and ACA ranges 800 hours typical for DCV and Ω ranges
Low battery indication : symbol is displayed
Auto power off : after 10 minutes
Jaw opening capability: 25.4mm
Dimensions: 203 x 75 x 32mm
Weight: 262g approx, including batteries
Includes: carrying case, set of TL16 test leads, 2 x 1.5V AAA batteries, instructions

ENVIRONMENTAL
Location: Indoor use only, or outdoor use in dry weather conditions
Temperature & Humidity:
(Operating): 0°C to 40°C <80% R.H., non-condensing
(Storage): -10°C to 60°C < 70% R.H., batteries removed
Altitude: up to 2000m
Pollution degree: 2

SAFETY
Conforms to: BS EN 61010-1, BS EN 61010-2-032, CAT III 600V, CAT IV 300V. Class II, double insulation.
EMC
Conforms to: BS EN 61326-1

SPECIFICATION FOR TL16 TEST LEADS
Maximum voltage: 1000V AC/DC
Maximum current: 10A continuous
Connector: 4mm banana plug with fixed shroud

Environmental
Temperature : (Operating & Storage): 0°C to 40°C
Altitude: up to 2000m
Pollution degree : 2
Safety
Conforms to: BS EN 61010-031, CAT IV 600V, CAT III 1000V, 10A (probe tip covers fitted), CAT II 1000V, 10A (probe tip covers removed) Class II, double insulation

Check out what else you can get from Martindale:

Martindale Electric Co. Ltd. Metrohm House, 12 Imperial Park, Imperial Way,
Watford WD24 4PP. T: +44 (0)1923 441717 F: +44 (0)1923 446900
www.martindale-electric.co.uk sales @martindale-electric.co.uk
Ver. D1.0

Due to policy of continuous development, Martindale Electric reserves the right to alter equipment specification and description outlined in this document without prior notice. No part of this document shall be deemed to be part of any contract for the equipment unless specifically referred to as an inclusion within such contract. © 2023 Martindale Electric Co. Ltd. Registered in England No. 3387451. LITCM55

Specification
CM55
AC Clamp Meter

Documents / Resources

| MARTINDALE ELECTRIC CM55 AC Clamp Meter [pdf] Instruction Manual
CM55, AC Clamp Meter, CM55 AC Clamp Meter, Clamp Meter, Meter
---|---

References

• Martindale Electric - Manufacturer of Voltage Indicators, PAT Testers & Socket Testers

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