PSN-L Email List Message

Subject: Re: Guralp seismo
From: Dave Nelson dave.nelson@...............
Date: Sun, 03 May 2009 13:26:19 +1000

Greetings Jack,
             When I visited the USGS.NEIC HQ in Golden, Colorado in 2006,
 John McMillan whas the lab tech that showed us lots of wonderful gear
amongst that were the Gulrap Horiz and Vert  seismo's

maybe the same as you have acquired  :)    I dont know if John is still there
but a phone call to there may get you some data sheets anyway

see how you go
Dave Nelson

At 10:23 PM 5/2/2009 -0400, you wrote:
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?

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