[time-nuts] another Ebay mixup, 5370
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sat Jun 9 17:55:14 EDT 2007
SAIDJACK at aol.com wrote:
> Hi Tom,
> this was the recommended setup (by HP) for checking the internal noise. Feed
> the 10MHz output back to the input using a short cable, and set the unit for
> "COMMON" input, setting 50 Ohm impedance etc.
> In the meantime I did some more tests, and found the following:
> 1) The sine-wave output is crappy. The sine wave has some sort of
> "Class-B" cross-over distortion, and it measures a whooping 200ps RMS jitter on my
> Wavecrest jitter analyzer (>400ps pk-pk). Compare that to 2.7ps RMS jitter I
> measure on our Fury 10MHz output. Definitely the crystal got damaged, or
> something else.
> The unit has about 2x better jitter performance (around 50ps RMS) if I feed
> a clean Fury 10MHz into it. I think the 10811 OCXO or the internal driver
> circuit may have gotten damaged.
Can you send an image of the rear panel sinewave output waveform?
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