The plot you posted seems to be related to just background noise.
One way to verify poles&zeros is to inject a identifiable level of pure 
white noise in the sensor and plot the amplitude spectrum.
Smoothing can help.

best regards
Mauro


Il 01/08/2012 05:46, Randall Pratt ha scritto:
> Is there a method to verify poles and zeroes and an instrument
> correction?  I have posted a noise plot at http://mit.midco.net/rpratt
> On the plot it appears there are notches or steps that do not appear in
> a WinQuake FFT of raw data. I have tried to repeat with several data
> files and the results are similar and that’s why I question the
> instrument correction but the plotting also includes smoothing that
> could be a factor.
>
> Randy
>

-- 
Mauro Mariotti
http://www.infoeq.it
http://www.sara.pg.it

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