[irised] Some AmaSeis improvements

[Bob Hutt]

The amplifier in the little black box is the cause of the DC 
offset.  It has nothing to do with the boom position, as the output 
of the coil and magnet is zero whenever there is no motion between 
the coil and magnet, regardless of the boom position.

         Bob Hutt

At 03:34 AM 5/19/2008, Tom Blake wrote:

>I had a query from a teacher who is using the Amaseis software. I
>noticed in a helicorder screen dump that he sent me, that the seismic
>trace was not co-incident with the helicorder hour line, so I asked him
>to adjust the zero value until there both were  co-incident, but then he
>replied  with this question,
>
>What is the origin of the zero value, is it due to the boom not being
>perfectly centred and causing an offset in the voltage output of the
>coil?? Just wondering?
>
>Would anyone suggest an answer, please
>
>Sincerely
>Tom Blake
>
>
>Alan Jones wrote:
> > I have made some small changes in AmaSeis and in the Stations program.
> >
> > *2008.02.02: *At request of John Lahr, Normalized the Fourier
> > Transform so that when analyzing noise, the amplitude remains
> > relatively constant as you extract different length signsls. Stations
> > program in AmaSeisAux now automatically downloads the
> > IRISEdStations.xml file from the IRIS download site.
> >
> > The Stations program displays a map of the world showing the stations
> > that are providing real-time upload of their data. You just click on
> > one of these stations and the last day's data are downloaded and
> > displayed on an AmaSeis screen. Consider adding your station to those
> > who are automatically uploading their data.
> >
> > To obtain these programs, follow this link:
> >
> > http://bingweb.binghamton.edu/~ajones/AmaSeis.html
> > <http://bingweb.binghamton.edu/%7Eajones/AmaSeis.html>
> >
> > Note, that this link has changed. The older www.geol.binghamton.edu
> > <http://www.geol.binghamton.edu> computer is being phased out. Please
> > change your links.
> >
> > Alan
> >
> > ############################
> > # Alan Jones
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> > ### http://home.stny.rr.com/alanjones
> > #### 607-786-5866
> > ##### 3717 Wildwood Drive
> > ###### Endwell, NY 13760
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> >
>
>
>--
>====================================================================
>Thomas Blake,    (Experimental Officer)   E-mail tb at cp.dias.ie
>Geophysics Section, School of Cosmic Physics,
>Dublin Institute for Advanced Studies
>5 Merrion Square                          VOIP  353-1-6535147 x 223
>Dublin 2                                  Phone 353 1 662 1333
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