Hi Given the relatively short life of some Rb’s and their usefulness as a reference for many things … better to have the 620 and an external Rb.
Next level is that Rb’s run pretty hot (lots of power). The 620 already is a bit warm inside. Adding even more heat does not sound very attractive. Bob > On Nov 27, 2014, at 4:06 PM, Dr. David Kirkby (Kirkby Microwave Ltd) > <[email protected]> wrote: > > 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 -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
