I finally paid for a used SR620 http://www.thinksrs.com/products/SR620.htm
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 http://www.thinksrs.com/products/SR625.htm 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. http://www.kirkbymicrowave.co.uk/ Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
