re: PS-2

Several years ago I evaluated a self-contaied short period 
"personal seismograph" called the "PS-2" , from a 
company called GEOSENSE in Pasedena. The single-channel 
price was $450 ( in 1995).

It consisted of a package that plugged into a com port
on a PC thru an adapter that also supplied power to
the sensor package from a wall adapter.

The sensor is a 4.5 hz geophone, aparently over damped
for a broader response, and an 19-bit digitizer with a
sample rate of 128 hz.

Several programs ran on the DOS PC, including a "recorder"
helical drum emulation mode and various analysis and 
plotting routines. The PC clock was used for time.
The software included event detecting with a pre-event
buffer for automatically saving files to disk in binary
format. The files could be exported as an ascii table.

The sensitivity was not great: The manual lists a threshold
(LSB?) of 1.6 microns/second at 1hz and 76 nanometers/second
from 4.5 to 32 hz. At one point the manual suggests jumping
up and down to test the sensor.

I don't know if this has anything to do with the recent
discussion of a similar system from Kinemetrics.

regards,
Sean-Thomas

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