Folks,

I've come into possession of a late 80's vintage Guralp vertical force
feedback seismo.

Unfortunately, it has no model information.  It has a 3"x9"
(waterproof-ish but not borehole-

ready) cylindrical sensor with very nice brass workings inside.  There
is also an amplifier

package in an aluminum cylinder.  It appears to use capacitive position
sensing, a force=20

feedback coil, and a triangular leaf spring to give about a 2-Hz
mechanical period.  It=20

has remote centering with a gearmotor, and a manual mass clamp for
shipping.  The

sensor has a cable coming out the bottom with a 10-pin MS connector on
the end, and

three pointed feet.  The sensor part looks pretty straightforward, and
I'm tracing the amp=20

circuit (this will take a while).

=20

This unit doesn't appear to be on Guralp's website. =20

=20

Anyone have any idea what I have here?  I can take some pictures if
it'll help.  Anyone

gotten obsolete information out of Guralp before?

=20

Thanks,

Jack

=20
















Folks,

I've come into possession of a late =
80's
vintage Guralp vertical force feedback =
seismo.

Unfortunately, it has no model
information.  It has a 3"x9" (waterproof-ish but not =
borehole-

ready) cylindrical sensor with very =
nice
brass workings inside.  There is also an =
amplifier

package in an aluminum =
cylinder.  It
appears to use capacitive position sensing, a force =


feedback coil, and a triangular =
leaf
spring to give about a 2-Hz mechanical period.  It =


has remote centering with a =
gearmotor, and
a manual mass clamp for shipping.  The

sensor has a cable coming out the =
bottom
with a 10-pin MS connector on the end, and

three pointed feet.  The =
sensor part
looks pretty straightforward, and I'm tracing the amp =


circuit (this will take a =
while).

 

This unit doesn't appear to be on =
Guralp's
website.  

 

Anyone have any idea what I have =
here? 
I can take some pictures if it'll help.  =
Anyone

gotten obsolete information out of =
Guralp
before?

 

Thanks,
=


Jack