I've been spending a small amount of my time looking into making a sort of
hybrid DMTD with a pair of DBMs up front feeding the stereo input to a sound
card. So, I got the 100KHz LPF back from Oshpark and hooked it up to my scope
for verification - an obvious step. Then I hooked it up to my 3456A just for
grins. (The two DBM inputs are 10MHz outputs from two different GPSDOs). So,
as I watch this, I think the obvious question: can this measure phase angle
better than the 5370A? I guess I need to send it through a full 100ns of phase
change to get a calibration value. So, who's been down this road and what did
you discover?
Bob
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