On 18/08/11 05:10, Paul Cianciolo wrote:
Hello Folks,
I am looking for an instrument that is better than Fluke 103a comparator.
The purpose of this piece of equipment is help me learn more about oscillators
and characterizing them
The HP5370B is the TIC I keep hearing about but I am not glued to that make or
model.
I wou;d like to hear suggestion from the group.
Could get you started. For good quality oscillators the resolution will
still be a limiting factor for short taus. For longer taus it should
give you good bang for the buck. GPIB interface should be something you
also invest in.
Another way to go might be to build one of those units where there is a common
oscillator is split and feeds the LO of 2 mixers.
The RF side comes from the DUT and the REF
Sorry I cannot remember the acronym... MDMM????
Dual Mixer Time Difference (DMTD)
You may have to look for a suitable offset oscillator, since you do want
a low noise one. Also consider that you need to feed it two signals, one
reference and one DUT. You will see the sum of both signals.
With a third mixer you can do three-cornered hat things to resolve the
phase noise of the individual oscillators. Naturally there is some
problems with all that, and isolation of the sources becomes important.
Ah well.
Cheers,
Magnus
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