Jon,
What is the period length of your Lehman sensor. Were you able to =
measure
how long it takes for the boom displacement to drop by 1/2 after giving =
it a
light touch and this would be without damping in place.
Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Wednesday, April 15, 2009 11:20 AM
To: psn-l@..............
Subject: RE: Changes to my Lehman sensor

Hi

Here are pictures of the latest changes to my lehman sensor. One of the
change is that the top now has a hindge to make it more movable. In
theory that should provide me with better frequancy. However. I
continune to get the peak at 0.6Hz, even with thoise changes. The damper
plate is now aluminum, not steel.

I am not sure how well this works until I get a earthquake close to
Iceland or some where in the world.

Pictures.

http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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