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

J. Forster jfor at quikus.com
Mon Nov 26 16:00:24 UTC 2012


Have you contacted ArtekMedia for any manual information?

Also, have you checked/posted a question to the VNA Agilent Forum?

-John

==============


> 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.
>
> It does not help the fact I can't find a service manual for this
> instrument. It's also a fairly expensive bit of kit (I paid $16,000 a
> few months back), so I'm not keen to screw it up. If need be, I'll
> write a bit of code which sets the clock from my computer whenever the
> GPIB is used. I've no need for precision time keeping on this, but it
> would be nice to have a copy of the date and time on any printouts.
> That's not possible when the clock runs so slow.
>
> On the off chance anyone does have a service manual for an 8720D,
> please let me know. I'll buy a copy if need be. There is not one on
> the Agilent web site - only the user manual.
>
> Dave
>
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