MARTINDALE CM58 User manual

CM58 CLAMP METER
INSTRUCTION
MANUAL
MARTINDALE
ELECTRIC
Trusted by professionals
1
CONTENTS
1 Introduction 2
1.1 Description 2
1.2 Unpacking & Inspection 4
1.3 Replacing the Battery 4
2 Safety Information 5
3 Operation 5
3.1 Safety Precautions 5
3.2 Voltage Measurement 6
3.3 Current Measurement 6
3.4 Resistance Measurement 7
3.5 Continuity Testing 8
3.6 Diode Testing 8
3.7 Capacitance Measurement 9
3.8 Frequency Measurements 9
3.9 Other functions 10
4 Maintenance 12
4.1 Cleaning 12
4.2 Repair & Service 12
4.3 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 for
the safe operation and maintenance of the clampmeter. 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.
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.
The clampmeter must only be used under the conditions and for the
purposes for which it has been constructed. Particular attention should be
paid to these Warnings, the Precautions, the Technical Specifications and
the use of the CM58 in dry surroundings.
Always inspect your clampmeter, test leads and accessories for any sign of
damage 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 not
expose it to direct sunlight, excessive temperature or moisture.
Keep this instruction manual for future reference. Updated instructions and
product 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. INTRODUCTION
This manual contains information and warnings which must be followed to ensure
safe operation of the clampmeter.
1.1 Description
This clampmeter is a handheld 4000-count instrument that is designed for use in
the laboratory, field servicing and any circumstance where high current
measurement is required. The clampmeter incorporates a finger guard which
ensures the safety of the user whilst operating the instrument, a rugged case that
is shock resistant and fire retardant and electronic overload protection for all
functions and ranges. In addition, a protective carrying case is included for
protection of the meter whilst not in use.
WARNING
READ "SAFETY INFORMATION" BEFORE USING THE METER
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1. Volt - Input Terminal
This is the positive input terminal for VOLTAGE measurements. Connection is
made to it using the red test lead.
2. COM - Common Terminal
This is the negative (Ground) input terminal for all measurement modes except
current. Connection is made to it using the black test lead.
3. HzFΩFrequency, Capacitance, Ohms, Diode Input Terminal
This is the positive input terminal for capacitance, frequency, Ohms and diode
measurements. Connection is made to it using the red test lead.
4. Display
The display indicates the measured value of signal, function mode, low battery,
range, peak and hold settings.
5. Function / Range selector rotary switch
The rotary switch selects the function and the desired range.
6. RANGE Button
Selects the manual ranging mode.
7. ZERO ΔButton
Selects the relative mode.
8. PEAK Button
This function is used to measure the peak value of an AC current signal and is
used with the AC current measurement function only.
9. MIN / MAX Button
This function is used on all ranges except AC current, to measure the maximum
and minimum values.
10. Hold Button
Freezes the displayed reading.
11. Clamp Jaws
Detects AC or DC current flowing through the conductor. The "+" marking on the
jaw indicates direction of DC current flowing through the conductor being tested.
When the current flows from the upside (display) to the underside of the
instrument, the polarity of the reading is positive and vice versa.
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12. Trigger
Squeeze the trigger to open the clamp jaws. When the trigger is released, the
jaws will close.
1.2 UNPACKING AND INSPECTION
After removing your new Digital Clamp Meter (DCM) from its packaging, you
should have the following items:
1. Digital clampmeter
2. 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 contact
the 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. When
the meter shows the " " sign the battery must be replaced to maintain proper
operation. Follow the procedure below to replace the battery.
1. Disconnect the test leads from any live source, turn the rotary switch to off
and remove the test leads from the input terminals.
2. The battery cover is secured to the bottom case by a screw. Using a Phillips
head 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.
WARNING
To 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, pollution
degree 2 in accordance with IEC-664 indoor use. If the equipment is used in a
manner not specified, the protection provided by the equipment may be impaired.
This product complies with the requirements of the following European
Community Directives: 89/336/EEC (Electromagnetic Compatibility) and
73/23/EEC (Low Voltage) as amended by 93/68/EEC (CE Marking).
Electrical noise or intense electromagnetic fields in the vicinity of the equipment
may disturb the measurement circuit. Measuring instruments will also respond to
unwanted signals that may be present within the measurement circuit. Users
should exercise care and take appropriate precautions to avoid misleading results
when taking measurements in the presence of electromagnetic interference.
3 OPERATION
Before making any measurements read the safety precautions. Always examine
the instrument and accessories used with the instrument for damage,
contamination (excessive dirt, grease etc) and defects. Examine the test leads for
cracked or frayed insulation and make sure the lead plugs fit snugly into the
instrument terminals. If any abnormal conditions exist, do not attempt to take any
measurements.
3.1 SAFETY PRECAUTIONS
The following safety precautions must be observed to ensure maximum personal
safety during the operation, service and repair of this meter:
1. Read these operating instructions thoroughly and completely before operating
your meter. Pay particular attention to WARNINGS which will inform you of
potentially dangerous procedures. The instructions in these warnings must
always 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 Red
test lead into the VOLT input jack.
3. When Connecting to a circuit always connect the common (Black) lead to the
circuit to be tested first and then the Live (Red) lead.
4. When testing DC voltage connect the common (Black) lead to negative and
then the Live (Red) lead to positive.
3.3 CURRENT MEASUREMENTS
WARNING
To avoid possible electric shock, instrument damage and / or
equipment damage, do not attempt to take any voltage measurements
if the voltage is above 1000V DC or 750V AC. These are the maximum
voltages 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 on
circuits with a maximum voltage difference of 500V AC between any
conductor and ground potential. Using the clamp jaws for current
measurements on circuits above this voltage may cause electric
shock, instrument damage and / or damage to the equipment under
test. Before measuring current, make sure that the test leads are
removed from the instrument.
The clamp jaws are overload protected up to 500V AC for up to 1
minute. Do not take current readings on circuits where the maximum
current potential is not known. Do not exceed the maximum current
that 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 be
measured making sure the jaws are fully closed and the conductor is central
within them.
NOTE: If measuring DC Current use the zero function before clamping around
conductor 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 Red
test lead into the HzΩFinput jack.
4. Connect CM58 to circuit or device under test.
NOTE: If measuring a low resistance touch the test leads together and push
ZERO button to deduct test lead resistance.
If the CM58 displays a flashing 4 on the left of the reading this means the
resistance being measured is greater than the measurement range of the CM58.
WARNING
Attempting resistance or continuity measurements on live circuits can
cause electrical shock, damage to the instrument and damage to the
equipment under test. Resistance measurements must be made on
de-energised (DEAD) circuits only, for maximum personal safety. The
electronic overload protection installed in this instrument will reduce
the possibility of damage to the instrument but not necessarily avoid
all 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 Red
test lead into the HzΩFinput 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 Red
test lead into the HzΩFinput jack.
3. Connect the Red lead to the anode and the Black lead to the cathode of the
diode to be tested.
NOTE: For a silicon diode the typical forward voltage should be approximately
0.6V. For a germanium the typical forward voltage should be 0.3V. If the diode is
reverse bias or there is an open circuit the reading displayed will be between
3.000V 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 Red
test lead into the HzΩFinput jack.
4. Connect to the capacitor (observing the polarity on polarised capacitors).
NOTE: when measuring capacitors the accuracy can be improved by using the
ZERO function before making the measurement to null out the residual meter and
lead capacitance. However using the ZERO function will cause the CM58 to enter
manual 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 Red
test lead into the HzΩFinput jack.
3. Apply the test prods to the points across which the frequency is to be
measured.
NOTE: For frequencies below 100Hz and greater than 100kHz the unit may not
be suitable.
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3.9 OTHER FUNCTIONS
RANGE Button
Press the RANGE button to select the manual ranging mode. The " " indicator
will be displayed. In the manual ranging mode, each time the range button is
pressed, the range will change to the next highest. To exit the manual ranging
mode 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 ΔButton
Press the ZERO button to enter the relative mode, the "ZERO Δ" indicator is
displayed. The clampmeter stores the detected reading as a reference value and
then zeros the display. To exit this mode, press and hold the ZERO button for 2
seconds.
In the Relative mode, the value shown on the LCD is always the difference
between the stored reference value and the present reading. For example, if the
reference value is 24.00V and the present reading is 12.50V, the display will
indicate -11.50V. If the new reading is the same as the reference value, the
display 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 value
measured 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 the
min/max function.
NOTE: if leaving for longer than 30 minutes the auto power off feature will have to
be 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 value
measured 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 to
be 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, after
approximately 30 minutes of inactivity. To turn the meter back on, simply push the
range button or turn the meter off then back on. To over-ride APO, set the
function switch to off. Press and hold the RANGE button and turn the function
switch 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 by
qualified personnel.
4.1 Cleaning
The CM58 may be cleaned using a soft dry cloth. Do not use abrasives, solvents,
or detergents, which could be conductive.
4.2 Repair & Service
There are no user serviceable parts in this unit. Return to Martindale Electric
Company Ltd if faulty. Our service department will quote promptly to repair any
fault that may occur outside the guarantee period.
Before the unit is returned, please ensure that you have checked the unit and
associated leads thoroughly for flat batteries (check & replace), blown fuses
(check & replace) and other poor connections.
4.3 Storage Conditions
The clampmeter 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.
5. WARRANTY
The CM58 is guaranteed against faults in manufacture and materials for 24
months from date of invoice and will be rectified by us free of charge, provided
the unit has not been tampered with and is returned to us with its housing
unopened. Damage due to dropping, abuse or misuse is not covered by this
guarantee. Batteries and fuses are not covered by this guarantee.
Display: 3¾ digit (4000 counts), 9999 counts (frequency mode), 42 segments
analogue 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]) at
18°C to 28°C with relative humidity up to 70%.
Specification
CM58 Clamp Meter
DC Volts
Overload protection: 1000V DC / 750V RMS
AC Volts (True RMS Sense)
*Effective accuracy: Input signal >40mV, frequency response: 50Hz to 100Hz
Input impedance: Same as DCV function with less than 100pF
Crest Factor ≤3
Overload protection: 1000VDC or 750V AC rms
AC Current (True RMS Sense)
Crest Factor ≤3
Overload 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
400Ω0.1Ω±(1.2% rdg +4d) 0.4Vdc
4kΩ1Ω±(1.0% rdg +2d) 0.4Vdc
40kΩ10Ω±(1.0% rdg +2d) 0.4Vdc
400kΩ100Ω±(1.0% rdg +2d) 0.4Vdc
4000kΩ1kΩ±(1.5% rdg +4d) 0.4Vdc
40MΩ10kΩ±(2.0% rdg +4d) 0.4Vdc
Range Audible Threshold Response Time Open Circuit Volts
400ΩLess than 40ΩApprox. 100ms 0.4Vdc
Range Resolution Accuracy Test Current Open 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 may
not 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
G18th Edition Testers
GAll-in-one’s
GCalibration Equipment
GContinuity Testers
GElectrician’s Kits
GFull Calibration & Repair Service
GFuse Finders
GDigital Clamp Meters
GDigital Multimeters
GMicrowave Leakage Detectors
GMotor Maintenance Equipment
GNon-trip Loop Testers
GPAT Testers & accessories
GPhase Rotation Units
GProving Units
GSocket Testers
GThermometers & Probes
GTest Leads
GVoltage Indicators
GSpecialist Metrohm Testers (4 & 5kV)
GSpecialist Drummond Testers
Other products from Martindale:
Martindale Electric Company Limited
Metrohm House, Imperial Park, Imperial Way,
Watford, Hertfordshire, WD24 4PP, UK
Tel: [phone] Fax: [phone]
E-mail:[email protected]
Website: www.martindale-electric.co.uk
© Martindale Electric Company Ltd. 2016
Registered in England No. 3387451. Rev 5