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Message ID: 2427     Entry time: Fri Sep 13 16:59:39 2019
Author: anchal 
Type: DailyProgress 
Category: PMC 
Subject: South PMC Servo Card changes 

Gain was way too low

  • The header H1 was not shorted on the board.
  • This reduced the gain of first stage to only 2, while it wsmeant to be 101!
  • I just opened the box and put back in jumper on this header.
  • The gain slider for AD602 is at -1 dB, 1 dB below the unstability point.
  • Earlier the slider was maxed out to 30dB, so we didn't know if we are close to optimum supression.
  • Changes have been updated in the schematic.
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