Jim,

I found out that I can convert these files to PSN type 4 files. Is that OK 
with you?. If so, I will send in a day or two. I've got a couple of buzy 
days coming up.

Dave...

At 06:07 AM 3/17/03 -0800, you wrote:
>Hi Dave-  I use DataQ poducts and WinDaq on occassion for K-12 school
>seismographs in Las Vegas- like the DI-194 (10 bit A/D for $25).
>If you can send me some data of events I would love to look at it.
>Send it to:
>jimo17@........
>
>Thanks....Jim
>On Mon, 17 Mar 2003 06:06:04 -0500 "David H. Youden" 
>writes:
> > 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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