PEM’s CWT ‘HF’ family of probes provide high voltage CMR

9th May 2022

Kiera Sowery

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For over 30 years PEM’s CWT Rogowski current probes have provided engineers a convenient, wide-bandwidth, accurate and low insertion impedance method of measuring alternating currents.

Its growing CWT ‘HF’ family of probes have two key advantages to meet the challenges of measuring current in today’s renewable and power electronic applications

Attenuate interference from fast local voltage transients and retain a small size
Optimised high frequency (HF) performance to measure rapidly changing AC currents

The CWTMini50HF is available with a coil size of just 100mm, 3.5mm thick with a rise-time capability of 12.5ns, suitable for the challenging environment of converters utilising new power SiC semiconductor switches. At the other end of the scale, the CWTHF with coils from 300mm to 1000mm, or even longer, enable measurement in applications as diverse as high frequency bearing current in machine shafts, lightning strikes and pulsed power applications and power measurement in large motor drives.

PEM has presented many technical white papers on noise immune, wide-band Rogowski probes at internationally recognised conferences. Engineers always need to understand the benefits and limitations of any measurement, therefore we have a number of detailed technical notes relating to the CWT ‘HF’ family providing advice on best practice, practical measurements showing the performance in real world applications and useful information on inherent probe delay, rise-time capability, slew rate and bandwidth.