[time-nuts] another Ebay mixup, 5370

John Miles jmiles at pop.net
Sat Jun 9 22:51:51 EDT 2007

(Sorry, meant to delete my quoted text but deleted Bruce's instead)

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of John Miles
> Sent: Saturday, June 09, 2007 7:09 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] another Ebay mixup, 5370
> It only goes up to 20-25 ps here, measuring the Thunderbolt->5087A output
> while running from the internal reference.  About the same as what I see
> when measuring either the 8640B or 8662A.  Definitely some 
> correlation going
> on, but not as significant a difference.
> That is probably the sort of thing that the (no doubt misadjusted)
> interpolator trimmers are designed to minimize.
> -- 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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