Martindale CM69 AC TRMS Earth Leakage Clamp Meter
Designed for detailed leakage current testing, the Martindale CM69 AC TRMS Earth Leakage Clamp Meter can resolve currents as low as 1µA, equal to 0.001mA. It measures AC current from 0.1mA up to 60A and provides 0.001mA resolution within the 6mA range. Its pocket-sized format also supports AC/DC voltage and resistance measurement.
True RMS measurement helps the meter give reliable leakage readings when unwanted frequencies or uneven wave shapes are present. The protected jaw also reduces the effects of wire position and nearby live wires. This design supports accurate, steady and repeatable readings during live testing.
The Martindale CM69 AC TRMS Earth Leakage Clamp Meter includes a selectable 50Hz filter for regular leakage checks and insulation checks without turning off the circuit. Electricians can use it to investigate unwanted RCD tripping, measure third-harmonic neutral currents and test appliance leakage. A clear backlit display, automatic ranging and CAT III 600V or CAT IV 300V safety ratings make it a good choice for a wide range of electrical fault-finding tasks.
Key Benefits
- Resolves very low leakage currents down to 1µA.
- Supports live fault finding without powering down the circuit.
- True RMS measurement improves results on distorted waveforms.
- Shielded jaw design helps deliver repeatable readings.
- 50Hz filter supports periodic insulation condition checks.
- Automatic ranging reduces the need for manual range selection.
- Backlit display improves visibility in areas with poor lighting.
- Measures AC/DC voltage and resistance as well as AC current.
- Helps identify leakage through protective or live and neutral conductors.
- Multiple safety categories support work on suitable electrical systems.
Common Applications
Martindale CM69 AC TRMS Earth Leakage Clamp Meter is suitable for a range of testing, maintenance and inspection tasks, including:
- Troubleshooting nuisance RCD tripping.
- Measuring earth leakage current.
- Measuring differential leakage current.
- Periodic leakage checks at 50Hz.
- Checking for insulation deterioration.
- Measuring triplen neutral currents.
- Testing distorted current waveforms.
- Appliance leakage current testing.
- Fault finding on electrical equipment.
- Testing lighting and power electronics.
Why Choose This Model?
The CM69 provides finer 0.001mA resolution and a switchable filter, features not listed for the CM57 or CM79. It also has a CAT IV 300V rating in addition to CAT III 600V, while retaining AC/DC voltage, resistance, True RMS and automatic-ranging functions.