PASSIVE TRANSDUCER (RC) FOR PULSED CURRENT WAVEFORMS

A Rogowski coil with passive RC integration is suitable for measuring short duration pulsed currents.

When might a Rogowski coil with Passive RC integration be suitable?

....if the di/dt of the current waveform exceeds the absolute maximum rating of the CWT range, 40kA/µs.

....if the rise-time of the measured pulse is less than 200ns.

What are the benefits of RC integration?

For a given Rogowski coil length, passive RC integration provides an increase in the high frequency 3dB bandwidth compared to an equivalent CWT.

Passive RC integration enables the Rogowski coil to be terminated with its characteristic impedance so that reflections in the Rogowski coil, seen as ringing on a pulsed waveform, are largely eliminated unlike methods such as 'self integration' see Passive transducer (Lr).

Higher di/dt capability than some CWT transducers as there are no restrictions due to slew rate or output current that are intrinsic in the active integrator electronics.

......and the drawbacks?

With no active integrator this method of integration has a severely limited low frequency bandwidth with 3dB cut-offs typically in the kHz range. Passive RC integration is only suitable for measuring pulses of less than a few micro-seconds.

If you think that your current lies outside the capabilities of our standard ranges, please Contact Us giving as much information about your requirement as possible and we will be happy to investigate the possibility of a special design.