[ANSS-netops] reftek unity or x32?

[John Torrisi]

Hey Mitch/All,

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:

http://www.iris.edu/hq/files/programs/passcal/docs/sensor_specs/s13.pdf


John

On Thu, Mar 17, 2011 at 9:49 AM, <mwithers at memphis.edu> wrote:

>
> We're upgrading some of our analog 3-c S-13 sites to digital telemetry
> and Reftek RT130 DAS's.  We're trying to decide whether to run at
> unity or x32 gain.  Being lazy and indecisive, my immediate question
> is what do other people do?
>
> Mitch
>
> Center for Earthquake Research and Information (CERI)
> University of Memphis                Ph: 901-678-4940
> Memphis, TN 38152                   Fax: 901-678-4734
>
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-- 
John Torrisi
Supervisor II, Associate Engineer
Nevada Seismological Laboratory M/S 174
Reno, NV 89557

775-848-2286
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