PSN-L Email List Message
Subject: Re: New Lehman seismometer pivots
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Fri, 01 May 2009 13:58:47 +0000
Here are pictures of the top and lower pivots. The top is a hindge that
allows free movement of the arm.
It was recomenned to me that I should put the magnet on the base, not
the arm. But I am not sure about the diffrance, I don't think it is
none. But it works anyway.
I am still unable to get the sensor frequancy below 0.4Hz. But this
design is a lot more flexable then the last one I used.
After the weekend I am going to do one more change. I plan to change the
setting of the arm. So it has not such sharp angle, but I belive that is
hampering my effort in getting the frequancy below 0.4Hz, as sharp angle
means faster movement of the arm.
On fim, 2009-04-30 at 19:46 -0700, Robert O. Green wrote:
> Very nice.
> Can you describe the upper and lower pivots?
> Is there advantage to having the coil on the boom rather than the magnet?
> J=F3n Fr=EDmann wrote:
> > Hi all
> > I got a new lehman seismomter build from the old one, that was not
> > working. The new one is bit more complex and more adjustable. Now I jus=
> > have to figure out how to get the seconds down to 10 to 20 seconds.
> > Here are pictures.
> > http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
> > Regards.
> > =20
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