PSN-L Email List Message
Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Thu, 07 May 2009 22:35:03 +0000
I did fix the issue that I was having, so I am ready to configure my
lehman sensor to maximum period that I can find. It currently is at 5
On fim, 2009-05-07 at 06:14 -0700, Geoffrey wrote:
> Isn't setting this period just a matter of
> positioning the lever arm as close to
> level as possible and still able to
> get it to seek a zero point reliably ?
> There should be a point where gravity will
> fail to overcome friction.
> That will be the limiting factor
> in how long a free period you may achieve.
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann"
> To: "PSN-Postlist"
> Sent: Wednesday, May 06, 2009 7:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
> Hi all
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
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