PSN-L Email List Message
Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
From: John Lahr johnjan@........
Date: Sun, 17 Aug 2008 22:03:59 -0700
I ran a Sprengnether vertical at the USGS in Golden some years
back. There was a small weight on the boom and a means of moving it
back and forth (without removing the cover) to adjust the zero
position of the sensor. From time to time the spring would sag a bit
and the weight had to be moved toward the pivot.
I'm about to leave town for a while, so one of the systems I'm
running is certain to have a problem soon. They look OK so far
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