[time-nuts] Is a crystal likely to change frequency by 3% ?

Alex Pummer alex at pcscons.com
Thu Sep 11 22:08:52 EDT 2014

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...
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" <david.kirkby at onetel.net> 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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