Re: Mechanical sensitivity of crystals...
From: James Meyer (jmeyer_at_nowhere.net)
Date: 08/25/04
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Date: Wed, 25 Aug 2004 12:21:22 GMT
On Wed, 25 Aug 2004 09:08:09 +0100, "Leon Heller" <leon_heller@hotmail.com>
wroth:
>"Mike" <mike@nospam.com> wrote in message
>>
>> The problem is, I've never heard of crystals having mechanical
>> sensitivities like this.
>>
>> Has anyone else seen anything like this? Is this effect documented
>> anywhere?
>
>Crystals are piezo devices and will be affected by mechanical shock.
>
>Leon
>
Although the crystal its self is a piezo device, the frequency of a
crystal oscillator is much more likely to be affected by the mechanical
sensitivity of the rest of the other components in the oscillator circuit.
Connect just the crystal to the board using an inch or two of very thin
wire bent into a zig-zag pattern and support the crystal separately from the
board so that you can isolate the mechanical shock to the board only. I suspect
the sensitivity to shock will appear only for the board.
Jim
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