Stephen,

Thanks for the tip. It seems to work just fine. I'll send you a couple of 
the converted files in a day or two.

Dave...

At 11:13 AM 3/17/03 -0800, you wrote:
>Hi David,,  If your interested in converting your files to PSN format, you 
>might
>try John Lahr's WDQ2PSN converter program,,,  I use it with my Dataq DI-150RS
>and it works great!!   You might ask John if it will work on your files???
>Hopefully, they are the same format????
>You can find it at:
>
>http://jjlahr.com/science/psn/gldn_psn.html
>
>Scroll down to the middle of the page to find his info and the link to the
>program!
>If yours are the same format and you decide to try it and have problems or
>questions, I'll be glad to try and help,,,,   or if you would like to send 
>a few
>minute of a recording, I'll try to convert it and let you know how or if it
>works!!!   If your interested in seeing one of my traces converted to PSN 
>format
>and then converted to a gif using the WINQUAKE program, you can see it on Bob
>Shannon's web site,, (it is the recording of the 4.0 Mammoth Lakes quake a few
>days back),  when you get there click on TRACES,,  at:
>
>http://www.televar.com/~earth/alert.html
>
>   Stephen
>   PSN Station #55
>   near Pilot Hill Ca
>   38.828N  120.979W
>
>"David H. Youden" wrote:
> >
> > Jim,
> >
> > I use Dataq"s Windaq software for a variety of reasons, so my recordings
> > are not compatible with the more common formats. I do have a few, which I
> > would be happy to share with anyone who can handle the file format, or I
> > can make picture files of them in some common format e. g. GIF or JPG.
> >
> > Dave...
> >
> > At 09:59 AM 3/16/03 -0800, you wrote:
> > >Hi Dave-  You got my attention- Nice work!- Do you have any records
> > >(seismograms) posted that we can look at?
> > >Jim O'Donnell - UNLV
> > >On Sun, 16 Mar 2003 11:57:47 -0500 "David H. Youden" 
> > >writes:
> > > > All,
> > > >
> > > > I got a chance yesterday to run some tests on my instrument.
> > > >
> > > > Here's what I did:
> > > >
> > > > I opened the loop and drove the force balance coil directly with a
> > > > HP
> > > > function generator ( Model 3310B). I placed a 1000 ohm resistor in
> > > > series
> > > > with the coil. I took my input signal from across the coil so I had
> > > > a
> > > > sensitivity of 1000 volts/amp. The output was taken at the output of
> > > > the
> > > > cap gauge circuit, after a 2 pole 35 Hz filter that would have been
> > > >
> > > > inconvenient to remove. The output device was a HP 54603B memory
> > > > scope. The
> > > > driven mass is pretty close to 500 grams.
> > > >
> > > > I attempted to take phase and P-P position data at constant
> > > > acceleration
> > > > from 0.1 Hz to 10 Hz while holding the current through the coil at
> > > > 94
> > > > microamps, i. e. 94 millivolts across 1000 ohms. Why that value?
> > > > Because it
> > > > was the maximum that I could use at 0.1 Hz and still maintain
> > > > linearity of
> > > > the cap gauge signal.
> > > >
> > > > Results:
> > > >
> > > > The force balance coil/magnet combination have a transfer function
> > > > of 0.26
> > > > Newtons/Amp.
> > > >
> > > > I lost the signal in the noise at about 6 Hz. Obviously, I could go
> > > > higher
> > > > with a larger input signal.
> > > >
> > > > The phase between acceleration and displacement was less than 20
> > > > degrees
> > > > throughout the range.
> > > >
> > > > The P-P displacement was about 60 nanometers at 6 Hz.
> > > >
> > > > The laws of physics still apply, as the P-P position signal was
> > > > inversely
> > > > proportional to the square of the frequency.
> > > >
> > > > There was no sign of roll-off due to damping from the cap gauge, but
> > > > then
> > > > the amplitudes were pretty low at the higher frequencies.
> > > >
> > > > Comment: My low pass filters are set to roll off at 5 Hz so data
> > > > beyond
> > > > that point is academic.
> > > >
> > > > Dave ...
> > > >
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