Hey Mitch/All,<br><br>Along with running the 130's on high gain we damp the inputs for S-13's with 5.6k ohm resistors and 9.1k for L-4-3's. Also, to prevent the magnets in S-13's from cross coupling with each other you should separate each sensor/vault. PASSCAL suggests 40cm between magnets, but we've seen it with our vaults that are placed further apart than that even? I will go three feet of separation for any future vault installs in our network. Here's a link:<br>
<br><a href="http://www.iris.edu/hq/files/programs/passcal/docs/sensor_specs/s13.pdf">http://www.iris.edu/hq/files/programs/passcal/docs/sensor_specs/s13.pdf</a><br><br><br>John<br>
<br><div class="gmail_quote">On Thu, Mar 17, 2011 at 9:49 AM, <span dir="ltr"><<a href="mailto:mwithers@memphis.edu" target="_blank">mwithers@memphis.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
We're upgrading some of our analog 3-c S-13 sites to digital telemetry<br>
and Reftek RT130 DAS's. We're trying to decide whether to run at<br>
unity or x32 gain. Being lazy and indecisive, my immediate question<br>
is what do other people do?<br>
<br>
Mitch<br>
<br>
Center for Earthquake Research and Information (CERI)<br>
University of Memphis Ph: <a href="tel:901-678-4940" target="_blank">901-678-4940</a><br>
Memphis, TN 38152 Fax: <a href="tel:901-678-4734" target="_blank">901-678-4734</a><br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>John Torrisi<br>Supervisor II, Associate Engineer<br>Nevada Seismological Laboratory M/S 174<br>Reno, NV 89557<br><br><a href="tel:775-848-2286" target="_blank">775-848-2286</a><br>