[ANSS-netops] Configuration for Kinemetrics Basalt - S-13s

[Jamison Steidl]

Even though the coil constant is quite high for these velocity transducers,
the mass will hit the physical stops well before they can get to m/s
velocities. I'm not sure what these physical limits are on the S-13, but we
use 420 V/m/s L4C's and have them set at 2.5V on the Basalt/Granite systems.
Assuming that you have an accelerometer at the site as well, even if you
clip the data logger not the sensor at the 2.5V scale, your accelerometer
should have great signal to noise at that point.

It would be interesting to test these on a shake table and see what their
actual max output is. It will of course be frequency dependent. I think we
saw physical clipping at about 0.002 m/s for out 420 V/m/s L4C's during the
aftershocks of the Northridge earthquake.

Cheers,
Jamie

From:  "David S. Croker" <croker at usgs.gov>
Date:  Tuesday, June 11, 2013 10:31 AM
To:  Jacob Crummey <jcrummey at gps.caltech.edu>
Cc:  <anss-netops at geohazards.usgs.gov>
Subject:  Re: [ANSS-netops] Configuration for Kinemetrics Basalt - S-13s

Hi John,

In the NCSN we do not use S-13's but rather L-4C seismometers from Sercel.
In the few installations where we have been installing Basalts with L-4C's
attached we have used the 2.5V full-scale value for that channel.  So far
that seems to work just fine.  However, I see that the S-13 has just over
twice the output (~630 V/m/s) as an L-4C (~275 V/m/s), so you may want to
try the 5V setting on the Basalt.

If you want more general help setting up the Basalt, ask Jacob.  ;-)

Dave

On Mon, Jun 10, 2013 at 12:16 PM, Jacob Crummey <jcrummey at gps.caltech.edu>
wrote:
>     
>  
> Hi John,
>  
>  Are you looking for the configuration of the Basalt specific to the S-13
> sensors?  Or are you asking for help in setting up a Basalt in general?
>  
>  I can help you with setting up a Basalt, but we don't use the S-13 sensors in
> our network.
>  
>  -Jacob
>  
>  
>  On 06/10/2013 12:11 PM, John H Parker (jhparkr1) wrote:
>  
>  
>>     
>>  
>> 
>> Net-Ops mailing list:
>>  
>>  
>>  
>> We are going to be setting up two new stations using Kinemetrics Basalt DASs
>> with S-13 sensors. We have never done this before, and wondered if anybody
>> out there had done this and how you had configured it.
>>  
>>  
>>  
>> Thanks so much for your help,
>>  
>> John
>>  
>>  
>>  
>> John H. Parker
>>  
>> Research Associate/Technician
>>  
>> The University of Memphis
>>  
>> Center for Earthquake Research and Information (CERI)
>>  
>> jhparkr1 at memphis.edu
>>  
>> (336) 228-7230
>>  
>> (901) 258-5115 (Mobile)
>>  
>>  
>>  
>> The University of Memphis, a Tennessee Board of Regents institution, is an
>> Equal Opportunity/Affirmative Action University. It is committed to education
>> of a non-racially identifiable student body.
>>  
>>  
>>  
>>  
>>   
>>  
>> _______________________________________________
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>  
>  
> 
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-- 
USGS - Earthquake Science Center - NCSN Field Operations Manager
David S. Croker                                                  office
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