[time-nuts] PRS-10 findings

Henk ten Pierick henk at deriesp.demon.nl
Wed May 30 16:22:36 EDT 2007

Hi Said,

My hp53310 shows the same artifacts if the input frequency is nearly  
the reference frequency. If I use the reference as input frequency  
the noise is lower. When I adjust the time/div to more than 2 times  
the frame flyback time, I can see a disturbance at the fylback  
interval with an amplitude of a few hundred ps. The behaviour is with  
both internal and external reference. The hp53310 is the modulation  
domain analyzer which forms the basis of the 53131/53132.


On May 30, 2007, at 21:43, SAIDJACK at aol.com wrote:

> In a message dated 5/30/2007 05:38:40 Pacific Daylight Time,
> pvince at theiet.org writes:
>> interference from an off-frequency signal.  I hadn't bothered  to  
>> lock
>> the counter to an external reference, and on measuring a  Rubidium
>> source against its internal oscillator, got a reading about  1.4 x
>> 10^-9 high, which matched perfectly this 70-second period   Locking
>> the counter to an external reference, this beating went away.
> Hi Peter,
> I was using the same PRS10 also as the counters' reference. Maybe  
> not a  good
> idea? I will try again with the internal ref, and my Cs as a ref.
> Glad you did see this as well, and fixed it!
> bye,
> Said
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