[time-nuts] Difference between HP 5370A and 5370B
Had
had at to-way.com
Fri Apr 15 23:25:46 UTC 2005
I have to agree with Brooke. I have both the 5370B and SR620 and I like the
620. I will admit to using the 5371A every once in awhile.
Had
K7MLR
At 04:13 PM 4/15/2005, you wrote:
>Hi David:
>
>There's an appendix in the Stanford Research manual for the PRS10 Rb
>oscillator that explains how to make 1,000 measurements each second and
>thus get 1 ps accuracy every second. It involves using a precision
>external clock into the SR620 and connecting the Ref Out (1 kHz derived
>from the internal or Ref oscillator) into the External Gate input. The
>Start and Stop signals need to be something like 10 MHz, or probably any
>frequency at or above 1 kHz. And the gate is used to enable a measurement
>1,000 times per second.
>Each second you could see a drift of 1E-12 and 1E-14 in 10 seconds! I'm
>going to try using this method to set one Cs standard to the one I think
>is now set.
>
>Note that some of the HP counters can display a large number of digits per
>second when measuring frequency, BUT NOT in time interval mode.
>
>I like the SR620!
>
>Have Fun,
>
>Brooke Clarke, N6GCE
>
>--
>w/Java http://www.PRC68.com
>w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
>http://www.precisionclock.com
>
>
>
>David Kirkby wrote:
>
>....
>
>>That counter sure was a pretty high-spec device in its day. I looked
>>today in the Standford Research cataloge and they have the SR620
>>
>>http://www.thinksrs.com/products/SR620.htm
>>
>>but I note that has a 25ps single shot capture. I've not looked at the
>>current HP (sorry Agilent) specs on this sort of equipment. . . . .
>
>
>
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