[time-nuts] SR620 - any gotchas buying a used one?

Bob Camp kb8tq at n1k.org
Fri Nov 21 19:15:09 EST 2014


The counter has a fairly extensive auto-cal / auto test built into it. Simply looping the output back to the input is about all the setup needed. Checking the calibration on the OCXO is the only thing that takes external gear. 

Past that, yes there are a variety of calibration settings and procedures that can be done to get the counter into perfect shape. Any of them could show up a problem. Doing all that is a bit beyond what I would expect from a normal seller. 


> On Nov 21, 2014, at 6:51 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> After regrettably selling my 5370B a few years ago, I decided to look for a
> used SR620.
> Are there any particular issues with these that could be tested by the
> seller prior to shipping it? I have not downloaded the manual yet, but I
> assume there's a basic test in there - probably similar to that in the
> 5370B manual.
> Were these available with a Rb oscillator?  I see a seller on eBay that he
> has some Rb ones for $1500 extra, but I don't see it as an option on the
> SRS web site.
> Dr David Kirkby
> Managing Director
> Kirkby Microwave Ltd
> Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
> 6DT, United Kingdom
> Registered in England and Wales as company number 08914892
> http://www.kirkbymicrowave.co.uk/
> Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT)
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