John Miles wrote:
That won't work as one of the sources is the PPS output from an Oncore
GT which has a PPS error spec< 500ns with SA on.
Whilst it may be a little lower without SA, it may be still be somewhat
greater than 100ns.
Dividing the 10MHz down to 1MHz or perhaps 100kHz would be better.
The 5370A timebase noise contribution to the measurement error will
still be insignificant.
The plot doesnt appear too discordant with the Oncore GT spec.
Ah, interesting... I stand corrected, then. Not at all familiar with that
particular piece of hardware. Looks like the jitter is more like 600 ns or
so (6E-7 at t=1s), so the measurement is in the right ballpark after all.
I hadn't tried TI in a 1-pps versus 1-pps measurement for some time, so I
ran a measurement overnight. The graphs were fine but the frequency-count
chart is buggy (to put it charitably)...
-- john, KE5FX
If the dominant noise source is white phase noise the ADEV(1s) value
should be divided by SQRT(3) to give the rms noise.
ADEV(1s) = 7E-7
Rms noise ~ 400ns
Bruce
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