Brooke (no relation) commented
Hi Richard:
>
> It's my understanding that this optimization can be done by changing the
> oscillator power level at the crystal.
>
> In the case of the 32768 Hz watch crystal, it must be run a very low power
> and it has a very low aging rate when compared to
Brooke Clarke wrote:
Hi Tom:
This is the first I've heard about the cracks. Can you point me to
some literature about it so I can do my homework.
Thanks,
Brooke
Brooke -- My comment last nite was an attempted
simplification/synthesis of Vig's topics --- here are some re
>It has nothing to do with "throwing off atoms". A Xtal is actually a
This only happens in very low quality crystals that have impurities on
the surface.
>Going in the other direction, the mechanical resonant frequency
>changes with time because, as the xtal vibrates, microscopic crac
9:21 PM
To: time-nuts@febo.com
Subject: [time-nuts] Xtal Oscillator Aging
Brooke (no relation) commented
Hi Richard:
>
> It's my understanding that this optimization can be done by changing
> the oscillator power level at the crystal.
>
> In the case of the 32768 Hz watch
At 22.20 26/10/2005, you wrote:
Hi,
I posed this question to Jack Kusters, now retired
from HP/Agilent. He and Charles Adams commercialized
the SC-cut crystal for HP in the 10811A oscillator. He
gave me permission to post his response on the reflector.
Jim Johnson
[EMAIL PROTECTED]
Jim an
In message <[EMAIL PROTECTED]>, "Richard \(Ric
k\) Karlquist \(N6RK\)" writes:
Richard,
I've browsed the E1398 papers and was left with one question which
I couldn't immediately find an answer to:
Is the cylindrical design meant for use in one orientation only
(axis orthogonal to temperature gra
Good question. The internal insulation is foam, which should
preclude convection (which is the only process which is gravity/
orientation sensitive. External convection should have negligible
effect. We used to test these things in environmental chambers
with big fans blowing air around and with
In message <[EMAIL PROTECTED]>, "Rick
Karlquist" writes:
>BTW, the intended application was as a card in a VXI cage, etc.
>Many of those cages have the card in a vertical orientation.
But did you test it both in horizontal an vertical orientation ?
--
Poul-Henning Kamp | UNIX since Zilog
Poul-Henning Kamp wrote:
>
> But did you test it both in horizontal an vertical orientation ?
>
I am not aware of any vertical testing, although the burn racks
may have been vertical. The end application had random orientation
and no one reported any orientation dependence.
Rick Karlquist
In message <[EMAIL PROTECTED]>, "Rick
Karlquist" writes:
>I am not aware of any vertical testing, although the burn racks
>may have been vertical. The end application had random orientation
>and no one reported any orientation dependence.
Well, that answers my question then: I must have overloo
At Sunday, October 23, 2005 9:21 PM, Tom Clark wrote:
> Going in the other direction, the mechanical resonant frequency
> changes with time because, as the xtal vibrates, microscopic cracks in
> the structure of the quartz break apart. Running at high power makes
> the crystal generate thes
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