[time-nuts] Advice on 5370A vs 5370B differences please

Mike S mikes at flatsurface.com
Sat Aug 29 12:58:17 UTC 2009


At 04:25 AM 8/29/2009, swingbyte wrote...
>  What effect upon measurements does the new front end have over that 
> of the 5370A?

The input changes affected the /1 input dynamic and operating ranges. 
100 mV - 1.0 V / -2.5 - 1.0 V p-p vs. 100 mV - 4.0 V / -4.0 - 4.0 V 
p-p.

>Does it mean significantly less jitter in the measurements? If so over 
>what window of measurement time?

The trigger error specification is the same for both.

They're basically the same as far as accuracy, although for TI the "A" 
is specified with 700 ps systematic error, while the "B" is 1 ns. For 
frequency, the "B" multiplies trigger error by 1.4 (the "A" does not). 
I have no idea if that reflects a change for the worse with the "B," or 
just a recognition of reality.

>Also, has anyone tried replacing the A model front end boards with 
>those of the B model?

The "B" A3/A4 input boards appear to be shared with (or at least based 
upon) that used in later 5345A counters.





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