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Entry  Mon Jan 24 02:58:46 2011, kiwamu, Update, Green Locking, X arm locked ! time_series.pnggreen_one_arm.png
    Reply  Mon Jan 24 09:33:08 2011, rana, Update, Green Locking, X arm locked ! 
       Reply  Mon Jan 24 13:08:07 2011, kiwamu, Update, Green Locking, Re: X arm locked ! e_pll_oltf.png
    Reply  Mon Jan 24 10:19:21 2011, Koji, Update, Green Locking, X arm locked ! 
       Reply  Mon Jan 24 14:27:13 2011, kiwamu, Update, Green Locking, Re: X arm locked ! masslock_oltf.png
Message ID: 4192     Entry time: Mon Jan 24 09:33:08 2011     In reply to: 4191     Reply to this: 4195
Author: rana 
Type: Update 
Category: Green Locking 
Subject: X arm locked ! 

Very cool.

But the PLL seems very fishy to me. The ZP-3MH needs 13 dBm to operate correctly. You should change the MODLEVEL input of the VCO so as to make the LO input of the mixer go up to 13 dBm. Then the input from the PD should be ~0 dBm.

Also, the PLL diagram seems to show that you have a 1/f^2 loop: 1/f from the SR560 and 1/f from the Hz->rad conversion ??

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