PSN-L Email List Message

Subject: RE: No intrest in earthquakes ?
From: "Gary Lindgren" gel@.................
Date: Mon, 22 Feb 2010 19:09:42 -0800

Right now I have the cover off. As you remember, this is in the wine cellar,
very stable temperature. But I agree the response is wild. I have it
disconnected (high gain) right now and will try it again a little later

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Brett Nordgren
Sent: Monday, February 22, 2010 6:45 PM
To: psn-l@..............
Subject: RE: No intrest in earthquakes ?


Did you completely remove the case and insulation or just unseal 
it?  Without any protection at all, temperature change and air 
current effects are likely to be hugely greater than just those from 
the buoyancy variations.  It looks pretty wild at the moment.

I recall that when Dave was looking to observe pressure-change 
effects, he just uncaps the tire-valve port in the cover, but 
otherwise he leaves the seismo fully covered and insulated.

Looks like when its sealed up it can perform really great.


At 09:06 PM 2/22/2010, you wrote:
>Yes I'm testing the seismometer without the case, it is now exposed to the
>open air and any changes in the atmospheric pressure, I thought it would
>calm down by now. I wanted plots with and without the pressure case.


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