[time-nuts] Question on crystal jumps

[Neville Michie]

Hi Antonio,

precise pendulum clocks also suffer rate jumps, the process of rate  
jumping
seems to be common to most time counting systems.

I have an LPRO rubidium oscillator. I mounted it on a heat sink with  
fins
and placed it in an insulated box. A small (40mm) fan is switched to  
control
the base-plate temperature at 40*C + or - 0.05*. As it warms up to  
the control point
the oscillator control voltage changes by 1 volt, so the oscillator  
control
voltage is very temperature sensitive. I do not think it will age  
beyond its
control range.
I hope that the temperature control will improve the frequency accuracy
by a large ratio.

cheers, Neville Michie




On 23/10/2008, at 8:02 AM, iovane@@inwind..it wrote:

> I would be very pleased to know when (date and time) anybody
> out there happened to record jumps in frequency of crystals.
> I have stable (e-07) tuning forks which happen to jump too,
> and I don't understand why, even having under control
> temperature and air pressure. Sometimes they return to their
> prior frequency with another jump, and this could happen even
> days later, sometimes they jump and then recover smoothly the
> prior frequency in a short time (such as one hour).
> I have no idea whether any correlations would exist between
> crystals and tuning forks jumps, regarding the causes that
> could trigger metastability, and hence I would have a look at
> crystal data in order to improve the base for future
> speculation.
>
> Thanks in advance.
> Antonio I8IOV
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ 
> time-nuts
> and follow the instructions there.