Power Electronic Measurements Ltd

A new LFR ac current probe with market leading low frequency performance has been introduced by Power Electronic Measurements Ltd (PEM). This compact, low cost, clip-around probe is both flexible and dual-range, while being optimised to give minimal phase measurement error at frequencies from 45Hz to 20kHz. This is a Rogowski current probe, similar to PEM’s highly successful CWT range, which covers 1Hz to 20MHz.

The highly successful CWT Ultra Mini range of ac current transducers from Power Electronic Measurements Ltd have been upgraded with improved mechanical features and uprated high frequency performance. The units feature a clip-around Rogowski coil thin enough (maximum cross section only 1.7mm) to ensure that it fits between the legs of a T0220 semiconductor device and also making it easier for use in confined spaces. Six models are available in the range covering sensitivity from 200 to 5.0mV/A with corresponding peak currents of 30 to 1200A. Higher current ranges can be made available on request.