40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Message ID: 6712     Entry time: Tue May 29 22:48:37 2012
Author: Den 
Type: Update 
Category: PEM 
Subject: Guralp noise 

I've checked whether the Guralp noise that we see comes not from seismometer but from ADC or readout box. I did 2 separate measurements . First, I've split 1 signal from Guralp into 2 before the input to AA board and subtracted one from another using Wiener filter. Second, I've connected inputs of channels 1 and 4 of the seismometer readout box and put the signal from seismometer to channel 1.

split_noises.png

The plot shows that ADC and readout box do not contribute too much to the Guralp noise.

ELOG V3.1.3-