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
Entry  Wed Aug 24 14:11:09 2016, Praful, Update, Electronics, Microphone Testing white_v_ambient.pngwhite_v_ambient.pdfwhite_v_ambient.pdf
    Reply  Fri Jan 20 17:12:37 2017, Steve, Update, PEM, EM172 mic is hooked up in the PSL EM172c.jpg
       Reply  Thu Feb 2 17:34:25 2017, rana, Update, PEM, EM172 mic is hooked up in the PSL MicFail.pdf
          Reply  Thu Feb 2 17:43:20 2017, gautam, Update, PEM, EM172 mic is hooked up in the PSL Mic_broken.png
Message ID: 12790     Entry time: Thu Feb 2 17:43:20 2017     In reply to: 12789
Author: gautam 
Type: Update 
Category: PEM 
Subject: EM172 mic is hooked up in the PSL 

I had noticed something wonky with the microphone, but neglected to elog it. I had tested it after installation by playing a sine wave from my laptop and looking at the signal on the PSL table, it worked fine. But you can see in the attached minute trend plot that the signal characteristics changed abruptly ~half a day after installation, and never quite recovered.\

 

Attachment 1: Mic_broken.png  27 kB  | Hide | Hide all
Mic_broken.png
ELOG V3.1.3-