This paper describes the use of an assembly of
electro-optic components and a high-performance capacitive
voltage divider in a novel voltage-measurement probe for use in
short-duration 500 kV pulsed-power situations, where conventional
probes are unsuitable. Complete electrical isolation is
provided between the high-voltage circuit and the recording
oscilloscope. Experimental results confirm a predicted
rise-time of less than about 3 ns, which is significantly
better than that of high-quality 90 MHz bandwidth commercially
available probes for the same level of voltage.