[time-nuts] SR620 flicker.

Tom Knox actast at hotmail.com
Sat Jun 9 15:10:11 EDT 2012


Thanks Bob;
It would be great if these are all cal issues. The offset is most likely calibration related, but I will be surprised if the jitter in a cal issue. It is certainly possible. I am thinking a weak/noisy cap. 
Thomas Knox



> From: lists at rtty.us
> Date: Sat, 9 Jun 2012 12:58:12 -0400
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] SR620 flicker.
> 
> Hi
> 
> There is a fairly detailed calibration procedure for the SR620. I don't remember all the steps, but it does indeed reduce the reading jitter.
> 
> Bob
> 
> On Jun 9, 2012, at 11:49 AM, Tom Knox wrote:
> 
> > 
> > I have a SRS SR620 that when an input channel is connected to the Ext Ref out has "Flicker" of about 3 digits of jitter/noise/drift. My experience is that most counter monitoring their external reference will be stable to one count with only an occasional larger jump. Magnus told me he has a SR620 that has the same instability problem, and that he heard this is a common problem for these units. Has anyone else encounter this problem? And of course the 2 dollar question, does anyone know how to repair this issue?
> > THANKS;
> > Thomas Knox
> > 
> > 
> > 		 	   		  
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