Bob,
Just try it. Compare it and see how the initial noise slope behaves and
compare it to other measurements.
Similar phase-measurement setups have been used in historic context.
What ends up being the best method for you is a combination of what
tools you have available and dare to bring into use.
I haven't tried this approach thought.
One if the key elements to make it work well would be if you can trigger
the measurements so you know what time-base you have. If your
observations is at 1.2 s or 1.8 s rather than something more common you
need to know, and best way is to steer it from a good source.
Cheers,
Magnus
On 10/01/2016 08:32 PM, Bob Stewart wrote:
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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