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Entry  Thu Oct 13 23:58:38 2011, Koji, Update, LSC, fixing REFL165  PA131612.jpgPA131618.jpg
    Reply  Sat Oct 15 16:42:08 2011, Koji, Update, LSC, Testing REFL165  REFL165_test_111014_KA.pdfREFL165_transimpedance2.pdf
       Reply  Sat Oct 15 17:06:20 2011, Koji, Update, LSC, Installation REFL165  
       Reply  Sun Oct 16 02:30:00 2011, rana, Update, Electronics, Testing REFL165  
    Reply  Wed Mar 1 17:25:28 2017, Steve, Update, LSC, MCREFL condition pictures IMG_3646.JPGmcRefl_1.jpgmcRefl_3.jpgmcRefl_5.jpg
       Reply  Fri Mar 17 14:49:09 2017, gautam, Update, LSC, MCREFL condition pictures IMG_7219.JPGMCREFL_X.pdfMCREFL_Y.pdf
Message ID: 5673     Entry time: Sun Oct 16 02:30:00 2011     In reply to: 5671
Author: rana 
Type: Update 
Category: Electronics 
Subject: Testing REFL165  

Unless the bias feedback circuit has been tuned for the 1 mm diode, its possible that you are seeing some C(V) effects. Its easy to check by looking at the phase response at 165 MHz v. the DC photocurrent. Then the feedback or feedforward gain can be tuned.

 

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