No that is to much, except if you overdrive it and you are so lucky that
after it broke it is still working on a different frequency, but I would
suggest check your frequency counter too, because 3% off of a clock
frequency wold make the clock almost unusable not just for time nuts...
73
KJ5UHN
Dr.Dipl.Ing. Alexander Pummer
PCS Consultants Pleasanton CA 94588
On 9/11/2014 3:33 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
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)
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