WOW, Jon, what a nice job. Let us know how well it works.
Pete


--- On Thu, 5/8/08, jonfr@.........  wrote:

> From: jonfr@......... 
> Subject: My lehman type sensor is ready
> To: psn-l@..............
> Date: Thursday, May 8, 2008, 6:28 AM
> Hi all
>=20
> My lehman type sensor is ready. I hope that it gives me up
> to 30 seconds
> peroid. But I won't know if that is the case of not
> until tomorrow when I
> put it online at home.
>=20
> Here are two pictures of it.
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> http://www.jonfr.com/myndir/v/geology/seismometer/DSC00432.JPG.html
> http://www.jonfr.com/myndir/v/geology/seismometer/DSC00433.JPG.html
>=20
> If hit by a blank page, just press enter and it should load
> properly.
>=20
> The mass is about ~1.5kg. The arm is ~70 cm and the mass is
> located at the
> ~65 cm limit of it.
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> I used to speaker magnets as damping magnest. The coil and
> the maget are
> from Larry. At current setting, I should be getting 0.135V
> from the coil,
> but that is just a guess. I will know for sure tomorrow.
>=20
> It appears to be higly sensitive. The damping appears to be
> working nicely.
>=20
> I will post more information tomorrow if needed.
>=20
> Regards.
> J=F3n Fr=EDmann.
>=20
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