[time-nuts] Convert Stanford Research SR620 time-interval counter to SR625 ???

Dr. David Kirkby (Kirkby Microwave Ltd) drkirkby at kirkbymicrowave.co.uk
Thu Nov 27 17:06:51 EST 2014

I finally paid for a used SR620


today, after the seller has done quite a few tests on it, so hopefully
I should have a good one.

I note Stanford Research also do an SR625


which seems to have two differences

a) It uses a PRS10 timebase
b) Has a 2 GHz pre-scaler.

I wonder if anyone has tried fitting a PRS10 into an SR620 to make it
close to an SR625? I'm not too fussed about having 2 GHz, as I just
bought a nice condition HP 5342A microwave (18 GHz) counter. But I
would be interested in fitting an Rb source in the SR620.

Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK.
Registered in England and Wales, company number 08914892.
Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)

More information about the time-nuts mailing list