On 26 Nov 2012 14:12, "David Kirkby" <[email protected]> wrote: > > I've got an HP 8720D VNA. This has been out of support from Agilent > for 8 years, so its getting on a bit. There's a clock in the > instrument which keeps the date and time. This is losing about 1 day > per month (rough guess), so it has slowed by a bit over 3%. > > I'm guessing this is likely to be a battery running flat, but are > there any other likely causes? I know crystal can jump in frequency, > but I'm guessing not by 3%, but perhaps if there was stress in the > crystal, it might be.
I just noticed this old post of mine. Whatever did cause it to slow about 3% no longer does. It now keeps good time - although definitely not time-nut standard. It probably keeps within a couple of seconds per month, which is good enough. 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) _______________________________________________ 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.
