Martindale CM67 Earth Leakage Clamp Meter

description

technical info

Martindale earth leakage clamps are designed to clamp around both live and neutral conductors to measure the difference between the flowing currents allowing the leakage value to be calculated.

The Martindale CM67 Earth Leakage Clamp has been designed as a high quality clamp meter that is ideal for identifying appliances or circuits which are causing RCDs to trip.

With a resolution down to 0.01mA and accuracy of up to 0.05mA, the Martindale CM67 can be counted on to take the right results. A Data Hold key is also included for fixing the display and a Min/Max key for measuring the minimum and maximum values.

This Martindale earth clamp meter can measure up to 600V AC, is autoranging, has a low pass filter (LPF) eliminating high frequencies and a Comparator, setting 1mA to 20mA, with a buzzer sound showing when an input is greater than the set value.

Martindale CM67 Earth Leakage Clamp Meter includes

Two 1.5V (AA) batteries
Carrying case
Test leads
Instruction manual
Optional accessories: TL55 fused leads

Technical Data Section

Display: 3200 count LCD, 8.8mm high.
Operating Principle: Dual Slope Integration.
Range Selection: Autoranging.
Sampling Rate: 2 times/sec.
Overload Indication: -OL- symbol shows (except on 60A).
Operating Environment: 0°C to 40°C at <80% R.H.
Battery Warning: BAT symbol shows when battery voltage is less than 2.5V ±0.1V.
Display Hold: DH symbol shows and display is held.
Filter Selection: LPF (Low Pass Filter) cuts off higher frequencies above approx. 150Hz.
Influence of External Magnetic Field: Less than 2mA against 100A AC conductor close to the clamp head.
Storage Conditions: -20°C ~ 60°C, less than 70% RH non-condensing.
Safety Level: BS EN 61010 overvoltage Category 3, class 2, double insulated, EMCD test passed.
Power Consumption: Approx. 5mW, (60mW for buzzer operation) 500 hours continuous operation.
Auto Power Save: Power turns off automatically (enters sleep condition of 0.05mW battery consumption) after about 30 minutes from Power-on or any other switch operation.
Power Hold (PH): Turn on POWER switch with DH key pressed. PH symbol shows on LCD and continuous measurements longer than 30 minutes are available.
Conductor Diameter: Max. 30mm Ø.
Dimensions & Weight: 212 x 42 x 30mm, 220g.

AC Current (~mA):

Ranges: 30mA, 300mA
Resolution: 0.01mA on 30mA, 0.1mA on 300mA range
Accuracy 50/60Hz: ±1.0% ± 5 dgts
Maximum Value: 320mA
Overload protection: 100A (600V line) for 1 minute
Frequency Characteristics: 1.0% ±3 dgts added at 50Hz~400Hz
Filter In Use: 1.0% ±3 dgts added at 50/60Hz

AC Current (~A):

Ranges: 30A, 60A
Resolution: 0.1A, 0.01A on 30A range
Accuracy 50/60Hz: 0~30A ±(1.5% ± 5 dgts), 30.1~50.0A ±(2.0% ± 5 dgts), 50.1~60.0A ±(5.0% ± 5 dgts)
Maximum Value: 60A
Overload protection: 100A (600V line) for 1 minute
Frequency Characteristics: 1.0% ±3 dgts added at 50Hz~400Hz
Filter In Use: 1.0% ±3 dgts added at 50/60Hz

AC Volts (~V):

Ranges: 300V, 600V
Resolution: 0.1V on 300V range, 1V on 600V range
Accuracy 50/60Hz: ± 2.0% ± 5 dgts
Maximum Value: 600V
Overload Protection: AC 900V for 1 minute
Frequency Characteristics: 1.0% ±3 dgts added at 50Hz~400Hz
Filter In Use: 1.0% ±3 dgts added at 50/60Hz