Some inexpensive oscilloscopes (B&K? Hameg?) have this capability built in.
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On Tue, 16 Dec 2014 17:33:53 -0800, you wrote:
The underlying idea behind the Huntron Tracker is an old one and there are
many circuit variations on the internet if anyone is interesting in building
one or adapting their scope to do the same thing. All that is needed is a
rudimentary scope with XY capability. Any one of us could build one in an
evening with parts on hand.