CM58 CLAMP METER

INSTRUCTIONMANUAL

MARTINDALEELECTRIC

Trusted by professionals1

CONTENTS

1 Introduction 21.1 Description 21.2 Unpacking & Inspection 41.3 Replacing the Battery 4

2 Safety Information 5

3 Operation 53.1 Safety Precautions 53.2 Voltage Measurement 63.3 Current Measurement 63.4 Resistance Measurement 73.5 Continuity Testing 83.6 Diode Testing 83.7 Capacitance Measurement 93.8 Frequency Measurements 93.9 Other functions 10

4 Maintenance 124.1 Cleaning 124.2 Repair & Service 124.3 Storage Conditions 12

5 Warranty 12

Technical Specification 13

SAFETY INFORMATION: Always read before proceeding.

WARNING

This manual contains both information and warnings that are necessary forthe safe operation and maintenance of the clampmeter. It is recommendedthat you read the instructions carefully and ensure that the contents are fullyunderstood. Failure to understand and to comply with the warnings andinstructions can result in serious injury, damage or even death.

In order to avoid the danger of electrical shock, it is important that propersafety measures are taken when working with voltages exceeding 30V ACrms, 42V AC peak or 60V DC.

The clampmeter must only be used under the conditions and for thepurposes for which it has been constructed. Particular attention should bepaid to these Warnings, the Precautions, the Technical Specifications andthe use of the CM58 in dry surroundings.

Always inspect your clampmeter, test leads and accessories for any sign ofdamage before use. If any abnormal conditions exist (e.g: broken test leads,cracked case, display not reading, etc.), do not attempt to use it. Do notexpose it to direct sunlight, excessive temperature or moisture.

Keep this instruction manual for future reference. Updated instructions andproduct information are available at: www.martindale-electric.co.uk

SYMBOLS:

Equipment complies with relevant EU Directives

AC (Alternating Current)

Ground

Direct Current

Equipment protected by Double Insulation (Class II)

Caution - refer to accompanying documents

Caution - risk of electric shock

End of life disposal of this equipment should be in accordance with relevant EU Directives

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1. INTRODUCTIONThis manual contains information and warnings which must be followed to ensuresafe operation of the clampmeter.

1.1 Description

This clampmeter is a handheld 4000-count instrument that is designed for use inthe laboratory, field servicing and any circumstance where high currentmeasurement is required. The clampmeter incorporates a finger guard whichensures the safety of the user whilst operating the instrument, a rugged case thatis shock resistant and fire retardant and electronic overload protection for allfunctions and ranges. In addition, a protective carrying case is included forprotection of the meter whilst not in use.

WARNING

READ "SAFETY INFORMATION" BEFORE USING THE METER

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1. Volt - Input TerminalThis is the positive input terminal for VOLTAGE measurements. Connection ismade to it using the red test lead.

2. COM - Common TerminalThis is the negative (Ground) input terminal for all measurement modes exceptcurrent. Connection is made to it using the black test lead.

3. HzFΩ Frequency, Capacitance, Ohms, Diode Input TerminalThis is the positive input terminal for capacitance, frequency, Ohms and diodemeasurements. Connection is made to it using the red test lead.

4. DisplayThe display indicates the measured value of signal, function mode, low battery,range, peak and hold settings.

5. Function / Range selector rotary switchThe rotary switch selects the function and the desired range.

6. RANGE ButtonSelects the manual ranging mode.

7. ZERO Δ ButtonSelects the relative mode.

8. PEAK ButtonThis function is used to measure the peak value of an AC current signal and isused with the AC current measurement function only.

9. MIN / MAX ButtonThis function is used on all ranges except AC current, to measure the maximumand minimum values.

10. Hold ButtonFreezes the displayed reading.

11. Clamp JawsDetects AC or DC current flowing through the conductor. The "+" marking on thejaw indicates direction of DC current flowing through the conductor being tested.When the current flows from the upside (display) to the underside of theinstrument, the polarity of the reading is positive and vice versa.

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12. TriggerSqueeze the trigger to open the clamp jaws. When the trigger is released, thejaws will close.

1.2 UNPACKING AND INSPECTIONAfter removing your new Digital Clamp Meter (DCM) from its packaging, youshould have the following items:

1. Digital clampmeter2. Test lead set (one black, one red)3. 9-Volt battery (installed in meter)4. Instruction manual 5. Protective carry case

If any of the above items are missing or are received damaged, please contactthe distributor from whom you purchased the unit.

1.3 REPLACING THE BATTERY

This meter is powered by a NEDA type 1604 or equivalent 9-volt battery. Whenthe meter shows the " " sign the battery must be replaced to maintain properoperation. Follow the procedure below to replace the battery.

1. Disconnect the test leads from any live source, turn the rotary switch to offand remove the test leads from the input terminals.

2. The battery cover is secured to the bottom case by a screw. Using a Phillipshead screwdriver, remove the screw and then remove the battery cover.

3. Replace the battery with a new equivalent 9-volt one observing correct polarity.

4. Replace the battery cover and re-install the screw.

WARNINGTo avoid electrical shock, disconnect the test leads and any input signals

before replacing the battery. Replace only with same type of battery.

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2 SAFETY INFORMATION

The instrument complies with class II overvoltage CAT III 1000V of the IEC1010-1 (EN61010-1) ; UL3111-1; and CAN/CSA C22.2 #1010.1-92 standards, pollutiondegree 2 in accordance with IEC-664 indoor use. If the equipment is used in amanner not specified, the protection provided by the equipment may be impaired.

This product complies with the requirements of the following EuropeanCommunity Directives: 89/336/EEC (Electromagnetic Compatibility) and73/23/EEC (Low Voltage) as amended by 93/68/EEC (CE Marking).

Electrical noise or intense electromagnetic fields in the vicinity of the equipmentmay disturb the measurement circuit. Measuring instruments will also respond tounwanted signals that may be present within the measurement circuit. Usersshould exercise care and take appropriate precautions to avoid misleading resultswhen taking measurements in the presence of electromagnetic interference.

3 OPERATION

Before making any measurements read the safety precautions. Always examinethe instrument and accessories used with the instrument for damage,contamination (excessive dirt, grease etc) and defects. Examine the test leads forcracked or frayed insulation and make sure the lead plugs fit snugly into theinstrument terminals. If any abnormal conditions exist, do not attempt to take anymeasurements.

3.1 SAFETY PRECAUTIONS

The following safety precautions must be observed to ensure maximum personalsafety during the operation, service and repair of this meter:

1. Read these operating instructions thoroughly and completely before operatingyour meter. Pay particular attention to WARNINGS which will inform you ofpotentially dangerous procedures. The instructions in these warnings mustalways be followed.

2. Please refer to the inside of the front cover for the WARNING instructions.

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3.2 VOLTAGE MEASUREMENTS

1. Select desired voltage range (AC V~ or DC V ).

2. Connect the Black test lead into the COM input jack on the CM58 and the Redtest lead into the VOLT input jack.

3. When Connecting to a circuit always connect the common (Black) lead to thecircuit to be tested first and then the Live (Red) lead.

4. When testing DC voltage connect the common (Black) lead to negative andthen the Live (Red) lead to positive.

3.3 CURRENT MEASUREMENTS

WARNING

To avoid possible electric shock, instrument damage and / orequipment damage, do not attempt to take any voltage measurements if the voltage is above 1000V DC or 750V AC. These are the maximumvoltages that this instrument is designed to measure. The "COM"terminal potential should not exceed 500V measured to ground.

WARNING

The clamp jaws are designed to take current measurements oncircuits with a maximum voltage difference of 500V AC between anyconductor and ground potential. Using the clamp jaws for currentmeasurements on circuits above this voltage may cause electricshock, instrument damage and / or damage to the equipment undertest. Before measuring current, make sure that the test leads areremoved from the instrument.

The clamp jaws are overload protected up to 500V AC for up to 1minute. Do not take current readings on circuits where the maximumcurrent potential is not known. Do not exceed the maximum currentthat the instrument is designed to measure.

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1. Select desired Current range 400A or 1000A (AC or DC).

2. Squeeze trigger to open the jaws and clamp them around the conductor to bemeasured making sure the jaws are fully closed and the conductor is centralwithin them.

NOTE: If measuring DC Current use the zero function before clamping aroundconductor and be sure to connect for correct polarity.

3.4 RESISTANCE MEASUREMENTS

1. De-energise circuit to be tested.

2. Select the resistance range (Ω).

3. Connect the Black test lead into the COM input jack on the CM58 and the Redtest lead into the HzΩF input jack.

4. Connect CM58 to circuit or device under test.

NOTE: If measuring a low resistance touch the test leads together and pushZERO button to deduct test lead resistance.

If the CM58 displays a flashing 4 on the left of the reading this means theresistance being measured is greater than the measurement range of the CM58.

WARNING

Attempting resistance or continuity measurements on live circuits cancause electrical shock, damage to the instrument and damage to theequipment under test. Resistance measurements must be made onde-energised (DEAD) circuits only, for maximum personal safety. Theelectronic overload protection installed in this instrument will reducethe possibility of damage to the instrument but not necessarily avoidall damage or shock hazards.

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3.5 CONTINUITY TESTING

1. De-energise circuit to be tested.

2. Select the Continuity range .

3. Connect the Black test lead into the COM input jack on the CM58 and the Redtest lead into the HzΩF input jack.

4. Connect CM58 to circuit or device under test.

5. The CM58 Will emit a tone when the resistance being measured is below 40Ω.

3.6 DIODE TESTING

1. Select Diode range .

2. Connect the Black test lead into the COM input jack on the CM58 and the Redtest lead into the HzΩF input jack.

3. Connect the Red lead to the anode and the Black lead to the cathode of thediode to be tested.

NOTE: For a silicon diode the typical forward voltage should be approximately0.6V. For a germanium the typical forward voltage should be 0.3V. If the diode isreverse bias or there is an open circuit the reading displayed will be between3.000V and 3.4000V.

CAUTION

Measurements must only be made with the circuit power OFF

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3.7 CAPACITANCE MEASUREMENT

1. De-energise circuit to be tested and discharge all capacitors.

2. Set the rotary switch selector to the (capacitance) range.

3. Connect the Black test lead into the COM input jack on the CM58 and the Redtest lead into the HzΩF input jack.

4. Connect to the capacitor (observing the polarity on polarised capacitors).

NOTE: when measuring capacitors the accuracy can be improved by using theZERO function before making the measurement to null out the residual meter andlead capacitance. However using the ZERO function will cause the CM58 to entermanual ranging.

3.8 FREQUENCY MEASUREMENTS

1. Select the Frequency range (Hz).

2. Connect the Black test lead into the COM input jack on the CM58 and the Redtest lead into the HzΩF input jack.

3. Apply the test prods to the points across which the frequency is to bemeasured.

NOTE: For frequencies below 100Hz and greater than 100kHz the unit may notbe suitable.

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3.9 OTHER FUNCTIONS

RANGE ButtonPress the RANGE button to select the manual ranging mode. The " " indicatorwill be displayed. In the manual ranging mode, each time the range button ispressed, the range will change to the next highest. To exit the manual rangingmode and return to auto ranging, press and hold the range button for 2 seconds.The " " indicator clears from the display and "AUTO" appears on the display.

ZERO Δ ButtonPress the ZERO button to enter the relative mode, the "ZERO Δ" indicator isdisplayed. The clampmeter stores the detected reading as a reference value andthen zeros the display. To exit this mode, press and hold the ZERO button for 2seconds.

In the Relative mode, the value shown on the LCD is always the differencebetween the stored reference value and the present reading. For example, if thereference value is 24.00V and the present reading is 12.50V, the display willindicate -11.50V. If the new reading is the same as the reference value, thedisplay will be zero. This feature can be used on all ranges.

Min / Max Button

1. Select desired measuring function and connect to the circuit to be measured.

2. Check you are measuring correctly.

3. Push the min/max button once, the CM58 will display the minimum valuemeasured from point when the min/max function was initialised.

4. Leave the CM58 measuring for the desired length of time.

5. Push hold button to stop measuring. Make a note of the minimum reading.

6. Push min/max button once to read the maximum reading.

7. Push min/max button again to clear the min/max readings and exit themin/max function.

NOTE: if leaving for longer than 30 minutes the auto power off feature will have tobe disabled.

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Peak Button

1. Select desired AC Current range.

2. Clamp around conductor to be measured.

3. Check you are measuring correctly.

4. Push the peak button once, the CM58 will display the minimum valuemeasured from point when the peak function was initialised.

5. Leave the CM58 measuring for the desired length of time.

6. Push hold button to stop measuring. Make a note of the minimum reading.

7. Push peak button once to read the Peak current reading.

8. Push Peak button again to clear the Peak readings and exit the Peak function.

Note:Note: if leaving for longer than 30 minutes the auto power off feature will have tobe disabled.

Hold Button

1. Push the HOLD button whilst measuring to hold the reading on the display.

2. Push HOLD again to clear the reading.

Other Functions - Auto Power Off (APO)Automatic power-off extends the life of the battery by turning the meter off, afterapproximately 30 minutes of inactivity. To turn the meter back on, simply push therange button or turn the meter off then back on. To over-ride APO, set thefunction switch to off. Press and hold the RANGE button and turn the functionswitch to any on position, then release the RANGE button.

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4. MAINTENANCE

Maintenance consists of periodic cleaning and battery replacement. Repairs or servicing not covered in this manual should only be performed byqualified personnel.

4.1 CleaningThe CM58 may be cleaned using a soft dry cloth. Do not use abrasives, solvents,or detergents, which could be conductive.

4.2 Repair & ServiceThere are no user serviceable parts in this unit. Return to Martindale ElectricCompany Ltd if faulty. Our service department will quote promptly to repair anyfault that may occur outside the guarantee period.

Before the unit is returned, please ensure that you have checked the unit andassociated leads thoroughly for flat batteries (check & replace), blown fuses(check & replace) and other poor connections.

4.3 Storage ConditionsThe clampmeter should be kept in warm dry conditions away from direct sourcesof heat or sunlight, and in such a manner as to preserve the working life of theunit. It is strongly advised that the unit is not kept in a tool box where other toolsmay damage it.

5. WARRANTYThe CM58 is guaranteed against faults in manufacture and materials for 24months from date of invoice and will be rectified by us free of charge, providedthe unit has not been tampered with and is returned to us with its housingunopened. Damage due to dropping, abuse or misuse is not covered by thisguarantee. Batteries and fuses are not covered by this guarantee.

Display: 3¾ digit (4000 counts), 9999 counts (frequency mode), 42 segmentsanalogue bar graph and function/units sign indicators.

Polarity: automatic, (-) negative polarity indication.

Over Range Indication: MSD (Most Significant Digit) blinks.Low Battery Indication: The " " is displayed when the battery voltage drops below accurate operating level.Measurement rate: 2/sec, nominal. 1/sec, Capacitance and Frequency mode.20/sec, analogue display.

Operating Environment: 0°C to 50°C at < 70%R.H.

Storage Environment: -20°C to 60°C at <80% R.H.

Temperature Coefficient: 0.1 X (specified accuracy) / °C (<18°C or >28°C)

Auto Power Off: 30 minutes after rotary switch or mode changes

Altitude: 6561.7 Feet (2000M)

Power: Standard 9-volt battery, NEDA 1604, IEC 6F22, JIS 006P.

Battery Life: 100 hours typical with alkaline battery.

Jaw Opening Capability: 57mm conductor, 70 X 18mm bus bar.

Size (H x W x D): 10.9 x 4.0 x 1.9 inches (277 x 102 x 49mm)

Weight: Approx. 18.9 OZ/ 540grams (including battery)

* Accuracy is given as ± ([% of reading]+[number of least significant digits]) at18°C to 28°C with relative humidity up to 70%.

SpecificationCM58 Clamp Meter

DC Volts

Overload protection: 1000V DC / 750V RMS

AC Volts (True RMS Sense)

*Effective accuracy: Input signal >40mV, frequency response: 50Hz to 100HzInput impedance: Same as DCV function with less than 100pFCrest Factor ≤ 3Overload protection: 1000VDC or 750V AC rms

AC Current (True RMS Sense)

Crest Factor ≤ 3Overload Protection: 1200A for 60 seconds Maximum

Range Resolution Accuracy Input Impedance

400mV 100μV ±(0.5% rdg +1d) >1000MΩ

4V 1mV ±(0.5% rdg +1d) 11MΩ

40V 10mV ±(0.5% rdg +1d) 10MΩ

400V 100mV ±(0.5% rdg +1d) 10MΩ

1000V 1V ±(0.5% rdg +1d) 10MΩ

Range Resolution Accuracy (50-500 Hz)

*400mV 100μV ±(1.5% rdg +4d)

4V 1mV ±(1.5% rdg +4d)

40V 10mV ±(1.5% rdg +4d)

400V 100mV ±(1.5% rdg +4d)

750V 1V ±(1.5% rdg +4d)

Range Resolution Accuracy (50-60 Hz)

400A 100mA 0-600A±(1.5% rdg+5d)50-60Hz

>600A±(2.0% rdg+5d)50-60Hz

0-600A±(3.0% rdg+5d)61-400Hz

1000A 1A >600A±(3.5% rdg+5d)61-400Hz

DC Current

Overload Protection: 1200A for 60 seconds Maximum

Resistance

Overload Protection: 500V DC or RMS AC

Continuity Test

Overload Protection: 500V DC or RMS AC

Diode Test

Overload Protection: 500V DC or RMS AC

Range Resolution Accuracy (50-60 Hz)

400A 100mA 0-600A±(1.5%rdg+5d)

600A-800A±(2.5%rdg+5d)

1000A 1A >800A±(3.5%rdg+5d)

Range Resolution Accuracy Open Circuit Volts

400Ω 0.1Ω ±(1.2% rdg +4d) 0.4Vdc

4kΩ 1Ω ±(1.0% rdg +2d) 0.4Vdc

40kΩ 10Ω ±(1.0% rdg +2d) 0.4Vdc

400kΩ 100Ω ±(1.0% rdg +2d) 0.4Vdc

4000kΩ 1kΩ ±(1.5% rdg +4d) 0.4Vdc

40MΩ 10kΩ ±(2.0% rdg +4d) 0.4Vdc

Range Audible Threshold Response Time Open Circuit Volts

400Ω Less than 40Ω Approx. 100ms 0.4Vdc

Range Resolution Accuracy Test CurrentOpen Circuit

Volts

4V 1mV ±(1.0% rdg +2d) 0.6mA 3.2Vdc typical

Capacitance

Overload protection: 500V DC or RMS AC

Frequency

Overload protection: 500V DC or RMS AC

Note: For frequencies below 100Hz and greater than 100 KHz, the display maynot be stable. For Frequencies below 1Hz, the display shows 00.00Hz

Range Resolution Accuracy Trigger Level

100Hz 0.01Hz ±(0.1% rdg +10d) 2.5V

1kHz 0.1Hz ±(0.1% rdg +4d) 2.5V

10kHz 1Hz ±(0.1% rdg +4d) 2.5V

100kHz 10Hz ±(0.1% rdg +8d) 2.5V

400kHz 100Hz ±(0.1% rdg +20d) 2.5V

Range Resolution Accuracy (with film capacitor or better)

4 nF 0.001 nF ±(1.0% rdg +40d) in Relative mode

40 nF 0.01 nF ±(1.0% rdg +4d) in Relative mode

400 nF 0.1 nF ±(1.0% rdg +4d)

4 μF 0.001 μF ±(1.0% rdg +4d)

40 μF 0.01 μF ±(1.0% rdg +4d) at < 20 μF

±(5.0% rdg +4d) at > 20 μF

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Other products from Martindale:

Martindale Electric Company LimitedMetrohm House, Imperial Park, Imperial Way,

Watford, Hertfordshire, WD24 4PP, UK Tel: +44(0)1923 441717 Fax: +44 (0)1923 446900

E-mail:sales@martindale-electric.co.uk

Website: www.martindale-electric.co.uk

© Martindale Electric Company Ltd. 2016 Registered in England No. 3387451. Rev 5