Geotech Smart24 data acquisition system input terminated noise seismic response adjusted test : StreckeisenSTS2-low and high gain, Guralp CMG3T and Geotech GS13 seismometers. Page: 3 of 30
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Printed August 2008
Geotech Smart24 Data Acquisition System
Input Terminated Noise
Seismic Response Adjusted Test:
Streckeisen STS2-Low and High Gain,
Guralp CMG3T and Geotech GS13
Darren M. Hart, Randy Rembold and J. Mark Harris
Ground-based Monitoring R and E
Sandia National Laboratories
P.O. Box 5800
Albuquerque, New Mexico 87185
Sandia National Laboratories has tested, evaluated and reported on the Geotech Smart24 data acquisition
system with active Fortezza crypto card data signing and authentication in SAND2008-. One test, Input
Terminated Noise, allows us to characterize the self-noise of the Smart24 system. By computing the power
spectral density (PSD) of the input terminated noise time series data set and correcting for the instrument
response of different seismometers, the resulting spectrum can be compared to the USGS new low noise
model (NLNM) of Peterson (1996), and determine the ability of the matched system of seismometer and
Smart24 to be quiet enough for any general deployment location. Four seismometer models were
evaluated: the Streckeisen STS2-Low and High Gain, Guralp CMG3T and Geotech GS13 models. Each
has a unique pass-band as defined by the frequency band of the instrument corrected noise spectrum that
falls below the new low-noise model.
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Rembold, Randy Kai; Hart, Darren M. & Harris, James Mark. Geotech Smart24 data acquisition system input terminated noise seismic response adjusted test : StreckeisenSTS2-low and high gain, Guralp CMG3T and Geotech GS13 seismometers., report, August 1, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc831198/m1/3/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.