Electrostatic screening probes boost accuracy
PCIM 2014: Wide-band screened CWT Mini Rogowski current probes from Power Electronic Measurements (PEM) use electrostatic screening strategy to enhance accuracy in the presence of large electrostatic interference signals. The shielding technique uses a low sensitivity coil and patented low-noise signal-conditioning circuitry.
The probes boost immunity to local dV/dt transients while maintaining a small size, flexibility, and 3dB bandwidth of up to 30MHz for a 100mm coil, says the company. The coil is only 4.5mm thick with 5kV insulation voltage, and can handle maximum current slope of 70kA/µs.
The probes can be used to measure complex current waveforms in equipment such as UPS circuits, SMPS and variable-speed drive inverters to counter high field strengths, or manage the high speeds and high blocking voltages of SiC for higher probe bandwidth and better common-mode immunity.
The probes deliver the advantages of a Rogowski coil, says the company and 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.
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