Martindale: CM69 Earth leakage applications

The CM69 TRMS AC Leakage Clamp Meter is ideal for troubleshooting leakage currents when other clamps can’t, like tracking down the causes of nuisance RCD tripping.

Featuring a unique jaw design that minimises influence of adjacent current conductors and a class leading resolution of 1µA, the CM69 can precisely and reliably measure currents from under 0.1mA up to 60A. The CM69 features a unique jaw design which minimises the influence of adjacent current conductors enabling professionals to perform precise and reliable tests at very low currents.

The CM69 uses True RMS measurement and ensures that leakage currents can be identified and measured accurately even when due to harmonics. In addition, the design includes a switchable filter enabling repeatable periodic measurements at 50Hz for assessing insulation quality and deterioration without powering down the circuit

The advanced features and high resolution make the CM69 an essential live troubleshooting tool for all electricians enabling fast solutions to common problems from nuisance tripping of RCDs, through to identification of triplen neutral currents. The very low current capability means it can also be used to simplify appliance testing by measuring leakage currents through the earth conductor or by clamping around both live and neutral conductors to measure the differential leakage current.