New wide-band screened CWT Mini Rogowski current probes from Power Electronic Measurements (PEM) feature an innovative electrostatic screening strategy that enhances performance and accuracy in the presence of large interference signals.
Engineers need the enhanced accuracy of a screened probe for measuring complex current waveforms in equipment such as UPS circuits, switched-mode power supplies and Variable-Speed Drive (VSD) inverters where high power density leads to high field strengths, or where the high speeds and high blocking voltages of silicon-carbide (SiC) devices call for higher probe bandwidth and better common-mode immunity.
Combining a novel shielded return conductor, low coil inductance and high-gain/low-noise signal-conditioning circuitry, the wide-band screened CWT Mini probes boost immunity to local dV/dt transients while maintaining small size, flexibility, and 3dB bandwidth of up to 30MHz for a 100mm coil. The probes feature a coil only 4.5mm thick with 5kV insulation voltage, and can handle maximum current slope of 100kA/µs.
PEM’s new wide-band screened CWT Mini probes eliminate the extra bulk and
bandwidth restrictions imposed by conventional screening techniques,
while delivering the known advantages of a Rogowski coil. These include
zero insertion impedance, freedom from flying leads, isolated
measurement, high peak-current rating, and the ability to measure small
AC currents in the presence of large DC current.
Below are links to the datasheet for the new CWT Mini range and an article from PEM published in Bodo's Power Systems that outlines the development of screened Rogowski coils, alternatively click here to visit the detailed product page:
