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A wideband fiber‐optic system for the measurement of ac high voltages is presented. The system is based on a capacitively coupled Pockels cell which works as a passive voltage sensor. The lower frequency limit is a few Hz and the upper is 150–230 MHz depending on the application. Other system characteristics are excellent electrical noise suppression, large voltage range, high input impedance, and ability to perform differential measurements separated from ground potential. Furthermore, the low cost, rugged design, and ease of operation make it suitable for measurements in a variety of high‐voltage applications.

Optical wideband high-voltage measurement system