MH&W has acquired a flexible, clip-around, current probe to measure high frequency bearing currents in large motor drives…high frequencies produced by motor drive IGBT’s in the kHz up to several MHz’s.
PEM Rogowski Coil Tool
This customized probe features:
- An electrostatically screened Rogowski coil. The screen decreases the effects of unwanted interference due to capacitive coupling from local voltages sources.
- A low frequency (-3dB) bandwidth to decrease any large fundamental power frequency currents. This significantly improves the SNR for measurement of high frequency bearing currents.
- A high frequency (-3dB) bandwidth of >/=10MHz for coil circumferences up to 1m.
- A wide range of Rogowski coil sizes suitable for even the largest drive cabling.
- Portable, battery operated for ease of field handling and testing.
Output:
- A BNC output enabling the engineer to look at the bearing current waveform and perform full diagnostics with an oscilloscope.