PSN-L Email List Message

Subject: Noise floor
From: "Paul Cianciolo" Paulc@........
Date: Wed, 25 Jul 2007 13:33:10 -0400

Hello Folks,

I have uploaded to The PSN events page a file called vertical noise floor.

This is the Noise floor of my new vertical sensor that has a period of 4

Can someone please download the file with Winquake and do an FFT on the

What you will see is a signature waveform that seems to be part of the
machine I built.
There always seems to be a lot of energy at .2 HZ with a roll of toward 1 HZ

Does this being a log scale, mean I has some noise peak, at .2 Hz ???
Is this real? or an artifact?

Ted TCID sent me a raw file from his machine, and the response is much

My next test is to lock down the coil/magnet sensor and take a reading and
see what the noise floor looks like.

When I replace the coil with a short circuit across the input of the seismic
amplifier, I get what looks like a flat response line.

Any ideas comments welcome.



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