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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