[ANSS-netops] s-13's and refteks

[Greg Steiner]

Mitch,
we typically used to run east tennessee S-13 stations with a gain of 
66db to 72 dB( 2000 to 4000) to produce a background noise of about 
5mVp-p. I suspect the noise is mainly higher frequency wind induced.
a reftek with its input set for 40vp-p differential will have its least 
significant bit be a little over 4.7uV if you run with no gain you would 
expect the output of the seismometer to be .005/2000 or 2.5uV. this will 
give you less than 1 bit of recorded background noise. i would therefore 
suspect that to record at least a little background noise you would want 
to run at least a gain of 32.
Greg Steiner

-- 
Greg Steiner
VLF Designs
1621 Bella Vista Dr
Jackson, Mo. 63755
Ph:573-204-1286

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