I have the DATAQ 154-RS, the newer version. I'm not sure how to
calibrate it. Can anyone help? I have it connected to a Kinemetrics PS2
system. It's connected to pin "C" of the Ps2. I think that I have it
connected properly because if I increase the gain on the PS2 the DataQ
software responds. But there signal is not behaving as the pin on the
drum is. It seems the pin will continuously move even when the gain is
set low. It's not until I increase the gain on the Ps2 all the way to
end of the dial, that I begin to actually see the signal in the DataQ
software respond. But shouldn't both pin and signal on my screen behave
nearly the same? Also I can't get the AmaSeis software to pickup the
signal. Any tips?

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@...............
On Behalf Of The Lahrs
Sent: Wednesday, February 13, 2002 7:28 AM
To: psn-l@..............
Subject: Re: A/D


Hi Chris,

What I need is a 1-channel AD for use in schools.
The DATAQ DI 151-RS was ideal for school seismometer use, as
it could be used with the excellent software provided by DATAQ with the
unit or with Alan Jones'  AmaSeis software.  I would like to see
developed a very simple seismometer for classroom use that when combined
with an AD and AmaSeis would register teleseisms from around the world.
If the cost of the entire package (seismometer, amplifier, AD) can be
kept under $150, then this instrument could be proposed for use in the
Globe program.

http://www.globe.gov/
The GLOBE Program  - Students and teachers from over 3500 schools in 51 
countries work with research scientists to learn more about our planet. 
Students make and submit environmental observations via the Internet. 
Scientists use GLOBE data in their research and provide feedback to the 
students to enrich their science education and post student data sets
daily 
on the WWW.

A lot of compromises may be required to get the price so low, but I
think it's possible.  A minimal school instrument need not be exactly
linear nor calibrated.  Need not be stable for months at a time.  Need
not be sensitive to only one component of ground motion.  Need not have
a pendulum period longer than 8 seconds - as an amplifier/filter
combination will still be able to pull out surface waves at periods of
15 to 20 seconds, as is done with the AS1 instrument.

The other purpose for the AD is to record a small geophone on
a table top.  That's why the 240 Hz sample rate is specified.  This is
used in demonstrations, such as for the Table Top Seismology
Demonstration.


Cheers,
John


>>Specifications needed:
One channel
sample rate:  1 to 240 Hz
AD sensitivity:  12 bit, +/- 10 Volt maximum
output: connect to serial port of PC
power: from PC serial port
price: $99 maximum ($50 preferred!)



>John,
>
>       What do you want to do with it?
>       You did not say how many channels you required?
>
>       Thurlby at http://www.tti-test.com/ do the VPS10 4 ch 12 bit 10
> microSec @$135
>
>       Pico seem to want far too much http://www.picotech.com/
>
>       I think that they effectively charge for the 'free' software in
> their module prices.
>
>       We really need someone to design a Kit boards that work with the
> free software available!!
>
>       Regards,
>
>       Chris Chapman

* John C. and Jan H. Lahr
* JohnJan@........
* 1925 Foothills Road
* Golden, Colorado 80401-1718
* Phone: (303) 215-9913
* http://lahr.org/john--jan/science.html

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