[time-nuts] another Ebay mixup, 5370

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jun 9 21:58:30 EDT 2007

John Miles wrote:
> Pretty similar results here, taken from the 5370B's rear-panel output while
> running on the internal 10811B (attached).  Indicated jitter with this setup
> is about the same as it was on the ext ref via the 5087A (10-12 ps).
> I've seen this counter return self-test jitter results in the 15-25 ps range
> before.  Not sure why it's in such a good mood today.
> At any rate, it doesn't appear that the wave shape is a problem... but of
> course, you will usually get better jitter readings with a fast edge than
> with a sine wave.
> -- john, KE5FX

My 5370A currently has the following characteristics:
With the EXT 10MHz connected to the input jitter is 15ps.
With an FTS1200 5MHz input signal jitter is 46ps.
With an external GPS locked 10MHz input signal jitter is 45ps.

This illustrates the danger in believing the jitter measured with a 
coherent input signal.


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