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Entry  Wed Jun 30 15:31:35 2021, Anchal, Summary, Optical Levers, Centered optical levers on ITMY, BS, PRM and ETMY 
    Reply  Thu Jul 1 16:55:21 2021, Anchal, Summary, Optical Levers, Fixed Centeringoptical levers PRM 
Message ID: 16236     Entry time: Thu Jul 1 16:55:21 2021     In reply to: 16231
Author: Anchal 
Type: Summary 
Category: Optical Levers 
Subject: Fixed Centeringoptical levers PRM 

This was a mistake. When arms are locked, PRM is misaligned by setting -800 offset in PIT dof of PRM. The oplev is set to function in normal state not this misalgined configuration. I undid my changes today by switching off the offset, realigning the oplev to center and then restoring the single arm locked state. The PRM OpLevs loops are off now.

Quote:

 PRM because I've known that we have been keeping its OpLev off. The reason was clear once I opened the table. The oplev reflection beam was hitting the PD box instead of the PD. After correcting, I was able to swithc on PRM opLev loops and saw normal functioning.

 

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