40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  SUS Lab eLog  Not logged in ELOG logo
Entry  Wed Dec 4 19:00:37 2019, Noisemon board modified, DailyProgress, , Noisemon board modifications 
    Reply  Thu Dec 5 12:37:58 2019, Noisemon board modified, DailyProgress, , Noisemon board modifications ModificationComparison.pdf
       Reply  Thu Dec 5 20:42:55 2019, Duo, DailyProgress, Electronics, Noisemon board modifications NoDrive.pdf10HzSine.pdfTF.pdf
Message ID: 1835     Entry time: Wed Dec 4 19:00:37 2019     Reply to this: 1836
Author: Noisemon board modified 
Type: DailyProgress 
Category:  
Subject: Noisemon board modifications 

According to previous post 1834, we think the noisemon problem is very likely caused by C2 charging. Hence we did the following modifications on a noisemon board:

1. Split R2 into two 400 Ohm resistors, with grounding between them.

2. Split C2 into two 3.3uF capacitors, with grounding between them.

We hope these modifications will provide a path for the bias current to go to ground, instead of charging up C2.

ELOG V3.1.3-