ELOG - Xend QPD and Whitening board pulled

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Thu Nov 7 14:39:49 2013, Jenne, Update, LSC, Lock Acquisition Game Plan

Fri Nov 8 18:12:21 2013, Jenne, Update, LSC, PRFPMI: Not crossing any resonances

Tue Nov 12 16:49:22 2013, Jenne, Update, LSC, Xend QPD and Whitening board pulled

Wed Nov 20 17:05:15 2013, Jenne, Update, LSC, Xend QPD and Whitening board replaced

Wed Dec 18 00:26:15 2013, Jenne, Update, LSC, Xend QPD schematic investigation

Wed Dec 18 11:32:34 2013, rana, Update, LSC, Xend QPD schematic investigation

Wed Nov 13 01:35:40 2013, Jenne, Update, LSC, PRM motion causing trouble?

Wed Nov 13 09:31:15 2013, Gabriele, Update, LSC, PRM motion causing trouble?

Wed Nov 13 19:22:58 2013, Jenne, Update, LSC, PRM motion correlated to intracavity power

Thu Nov 14 02:50:43 2013, Jenne, Update, LSC, PRM oplev measured and modeled TF

Mon Nov 18 21:02:54 2013, Jenne, Update, LSC, PRM oplev measured and modeled TF

Mon Nov 18 21:40:24 2013, Koji, Update, LSC, PRM oplev measured and modeled TF

Tue Nov 19 14:47:44 2013, Jenne, Update, LSC, PRM oplev measured and modeled TF

Thu Nov 14 02:55:26 2013, rana, Update, SUS, PRM motion correlated to intracavity power

Thu Nov 14 11:41:19 2013, Steve, Update, SUS, PRM sensors effected by IR

Thu Nov 14 14:35:12 2013, Steve, Update, SUS, IR effect on MC and PRM sensors

Fri Dec 6 10:03:07 2013, Steve, Update, SUS, IR effect on MC sensors only

Message ID: 9367 Entry time: Tue Nov 12 16:49:22 2013 In reply to: 9360 Reply to this: 9418 9484

Author:	Jenne
Type:	Update
Category:	LSC
Subject:	Xend QPD and Whitening board pulled

Quote:

* Whitening for the transmission QPDs needs to be thought about more carefully. (Calculation, then hardware)

I have the X end transmission QPD, as well as the whitening board, out on the electronics bench. Since the Thorlabs high-gain TRX PD also goes through this whitening board, we have no transmission signal for the Xarm at this time. The whitening board was in the left-most slot, of the top crate in the Xend rack. The only cables that exist for it (like the Yend), are the ribbon from the QPD, the 4-pin lemo from the Thorlabs PD, and the ribbon going to the ADC.

I have taken photos, and want to make sure that I know what is going on on the circuits, before I put them back in.

The QPD:

The whitening board:

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