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John,<br>
setting up a digitizer with a source that can theoretically produce
an infinite output voltage poses some interesting problems. First
the digitizer has over voltage protection on the input, and even
though a seismometer operating under strong excitation may produce
several hundred volts, it is not capable of supplying much current,
so this should not be a problem.<br>
<br>
A typical short period monitoring system is set up to produce a
preamp out signal of 10mVp-p with a preamp gain of 72dB in a quiet
site typical of east TN or western NC. This signal typically had a
bandwidth of approximately 25 Hz. a digitizer operating at 100SPS
has a bandwidth of approximately 40Hz at the cutoff frequency of the
anti alias filter. The wider bandwidth will produce a little more
noise because of all the cultural source noise at the higher
frequencies. Adjusting for the bandwidth, i would expect the noise
to be around 15mVp-p at a gain of 72 dB. 72 dB is a gain of
approximately 4000. if you divide 15mV by 4000 you come up with a
seismometer signal of 3.75uVp-p. this is the signal you will be
digitizing.<br>
<br>
Now lets look at the digitizer. for a true 24 bit digitizer there
are 2**24 bits or roughly 16.8 million counts . If you take the
largest full scale range of the digitizer to be 40Vp-p this would
mean that 1 count represents a p-p signal of 2.38uVp-p. This would
mean that the output of a non amplified seismometer would be 1.5
counts at normal background. Here in lies the crux of the problem.
the output of a seismometer increases with excitation frequency
implying that at low frequencies there would be even less output.
One way around this is to set the digitizer gain higher by setting
its full scale value to a lower value. if you use a full scale value
of 5vp-p, 1 count now represents 1/8 of what it did at 40 Vp-p. or
approximately 300nV. this would in turn give you about 8-10 counts
of digitized signal at normal background levels. <br>
<br>
A typical S-13 seismometer is assumed to have a dynamic range of
approximately 130 dB. while a 24 bit digitizer has a theoretical
dynamic range of 144 db. setting the digitizer to higher gain of 10
Vp-p would therefore match the theoretical dynamic range of the
sensor closer to the dynamic range of the digitizer. Personally I
would like to see background counts from the digitizer in the range
of 500 to 1000 counts typically so that loss of low frequency
signals is not so apparent. unfortunately, this can only be obtained
with an outboard amplifer and will necessarily sacrifice some of the
available dynamic range of the sensor. All of the above calculations
assume a white distribution of noise in the digitizer(probably a
good assumption with a high quality digitizer) and lack of local
high frequency noise sources(turbulent water flow, highway,
mechanical equipment...) near the seismometer. Hope this helps
provide at least a rudimentary framework for analyzing the problem.<br>
Greg steiner<br>
<div class="moz-cite-prefix">On 6/11/2013 7:00 AM,
<a class="moz-txt-link-abbreviated" href="mailto:anss-netops-request@geohazards.usgs.gov">anss-netops-request@geohazards.usgs.gov</a> wrote:<br>
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cite="mid:mailman.1.1370952002.9131.anss-netops@geohazards.usgs.gov"
type="cite">
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Today's Topics:
1. Configuration for Kinemetrics Basalt - S-13s
(John H Parker (jhparkr1))
2. Re: Configuration for Kinemetrics Basalt - S-13s (Jacob Crummey)
3. Re: Configuration for Kinemetrics Basalt - S-13s
(Jaffet Martinez Pagan)
----------------------------------------------------------------------
Message: 1
Date: Mon, 10 Jun 2013 19:11:16 +0000
From: "John H Parker (jhparkr1)" <a class="moz-txt-link-rfc2396E" href="mailto:jhparkr1@memphis.edu"><jhparkr1@memphis.edu></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:anss-netops@geohazards.usgs.gov">"anss-netops@geohazards.usgs.gov"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:anss-netops@geohazards.usgs.gov"><anss-netops@geohazards.usgs.gov></a>
Subject: [ANSS-netops] Configuration for Kinemetrics Basalt - S-13s
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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)
<a class="moz-txt-link-abbreviated" href="mailto:jhparkr1@memphis.edu">jhparkr1@memphis.edu</a><a class="moz-txt-link-rfc2396E" href="mailto:jhparkr1@memphis.edu"><mailto:jhparkr1@memphis.edu></a>
(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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Message: 2
Date: Mon, 10 Jun 2013 12:16:36 -0700
From: Jacob Crummey <a class="moz-txt-link-rfc2396E" href="mailto:jcrummey@gps.caltech.edu"><jcrummey@gps.caltech.edu></a>
To: <a class="moz-txt-link-abbreviated" href="mailto:anss-netops@geohazards.usgs.gov">anss-netops@geohazards.usgs.gov</a>
Subject: Re: [ANSS-netops] Configuration for Kinemetrics Basalt -
S-13s
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:51B62614.1040407@gps.caltech.edu"><51B62614.1040407@gps.caltech.edu></a>
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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:
</pre>
<blockquote type="cite">
<pre wrap="">
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)
<a class="moz-txt-link-abbreviated" href="mailto:jhparkr1@memphis.edu">jhparkr1@memphis.edu</a> <a class="moz-txt-link-rfc2396E" href="mailto:jhparkr1@memphis.edu"><mailto:jhparkr1@memphis.edu></a>
(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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</pre>
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Message: 3
Date: Mon, 10 Jun 2013 16:30:33 -0400
From: Jaffet Martinez Pagan <a class="moz-txt-link-rfc2396E" href="mailto:jaffet.martinez@upr.edu"><jaffet.martinez@upr.edu></a>
To: Jacob Crummey <a class="moz-txt-link-rfc2396E" href="mailto:jcrummey@gps.caltech.edu"><jcrummey@gps.caltech.edu></a>
Cc: <a class="moz-txt-link-abbreviated" href="mailto:anss-netops@geohazards.usgs.gov">anss-netops@geohazards.usgs.gov</a>
Subject: Re: [ANSS-netops] Configuration for Kinemetrics Basalt -
S-13s
Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:CAH4w05As5cUQNv3OHVeD6OWpp1QC3uT9PO47NsMAOL0Bk1vuZw@mail.gmail.com"><CAH4w05As5cUQNv3OHVeD6OWpp1QC3uT9PO47NsMAOL0Bk1vuZw@mail.gmail.com></a>
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Hi John:
Please visit the kinemetrics website. They have technicals reports to how
configure the basalts units. Go to Application notes, you need a password,
and then go to Rock Family sections and then Rock Training Resources. If
you need a password ask for one.
2013/6/10 Jacob Crummey <a class="moz-txt-link-rfc2396E" href="mailto:jcrummey@gps.caltech.edu"><jcrummey@gps.caltech.edu></a>
</pre>
<blockquote type="cite">
<pre wrap=""> 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)****
<a class="moz-txt-link-abbreviated" href="mailto:jhparkr1@memphis.edu****">jhparkr1@memphis.edu****</a>
(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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</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
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