[time-nuts] Vibration isolation of quartz oscillators

[Tim Shoppa]

Damping at time constants of a fraction of second or longer can be done with shock absorbers which are usually some form of dashpots filled with viscous fluid or gas.

In the industry I work in we often use airbag suspensions up to time constants of several seconds.

I might guess that most vibrations in a lab you would want to eliminate would be fans humming in the same rack or folks opening and closing doors. These would be vibrations that are in the acoustic range.
I’m thinking the original rubber mounts were intended for this class of vibration dampening.

Tim N3QE

> 
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of
> Michael Wouters
> Sent: Saturday, June 27, 2020 08:03
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Vibration isolation of quartz oscillators
> 
> I have three Oscilloquartz 8607-Bs that I'm rehousing.
> 
> In their former life they were part of the frequency synthesis chains
> for H-masers and they hung vertically from a rubber suspension that was
> presumably intended to provide vibration isolation. Unfortunately, the
> person responsible for this has long since retired so is no longer
> around to ask questions of.
> 
> In the experiment I will be averaging over  100 s, which suggests to
> me that very low frequencies are what I need to filter out (if at
> all), and I am skeptical that the rubber will do this. Space is tight
> so I am wondering
> whether I should simply ditch the isolation.
> 
> What do other people do with their quartzes ? I thought I should ask
> for some advice before attempting measurements.
> 
> Cheers
> Michael
> 
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