On Tue, 9 Nov 2010 22:01:27 -0500, "Barry" wrote:

You would need an extremely fast rise-time pulse generator and an

This can be easily be obtained (provided you can find one) from a
mercury wetted switch. Typical rise times in the sub-nano to
nanoseconds.

exceptionally fast oscilloscope

Which, is something you would have to spend money on - most assuredly.

OR

Use a wide field microscope against the CRT being driven at the
deflection plates (the early design for these applications of
extremely fast pulse measurements) which can be far more affordable.

73's
Richard Clark, KB7QHC