11
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.
12
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
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