The biggest difference between the 5370 and the 5372 is the single-shot
resolution. The 5370 has a resolution of 20 ps while the 5372 is
limited to 150 ps. When measuring Allen Deviation, this difference
means that for a Tau of 1 second, the 5370 can measure down to approx.
2e-11 while the 5372 can only reach 1.5e-10. Note that since many
high-quality OCXOs are spec'ed lower than these numbers, neither counter
can directly measure them and need help e.g. DMTD or some other
heterodyne technique.
Ed
Steve Rooke wrote:
2009/7/31 John Green <[email protected]>:
I've been hanging around and reading long enough to understand that when
measuring the differences between oscillators the preferred methods are the
HP 5370A Time difference counter or the dual mixer method. I want to
What's the difference between a HP 5370A and a HP 5372A for this type
of measurement?
73,
Steve
evaluate some ocxo's and Rb sources against either a Tbolt or Z3801 and I
don't have either method available. What I have used in the past is an HP
Infinium scope with the reference fed to one channel which also provides
sync and the DUT to the other. I have tested 2 ocxos that were so close that
the two waveforms did not move by a detectable amount in a 30 minute period.
I realize that this method will require very long observation times when
looking at more stable sources. I am not looking to get absolute data, just
comparative. Given what I have to work with, is there a better way? I use an
Agilent 89441A Vector Signal Analyzer for signal quality measurements. I can
see 60 Hz sidebands at least 60 or 70 db down and while I can't measure
phase noise, I can tell a clean oscillator from a dirty one. For instance,
there is a world of difference between the signal generated by an HP8920 and
a E4430B.
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