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Reports until 11:55, Tuesday 12 July 2022
H1 ISC (CAL, CDS, DetChar, ISC, OpsInfo)
jeffrey.kissel@LIGO.ORG - posted 11:55, Tuesday 12 July 2022 - last comment - 08:42, Friday 09 September 2022(63905)
DB25 Breakout Board installed into OMC DCPD Signal Chain; Clip leads and BNC Cables hooked up (and 50 Ohm terminated) for Easy Access to DCPD readout channels
J. Kissel, L. Dartez
10540

In order to assess the frequency response of the voltage signal coming from the Transimpedance Amplifier going in to the OMC DCPD whitening chassis, for up-coming in-lock measurements of the OMC DCPDs signal, Louis and I have installed a DB25 pin breakout board (and a short cable extension) at the input of the whitening chassis. In addition, so we're not fussing with the cable system and connections while connecting clip leads in-and-out of the breakout board, we pre-clip-leaded 4 BNC cables (2 DCPDs, 2 legs of the differential) to the breakout board, and applied an ugly amount of strain relief with velcro cable ties. The open ends of the BNCs have been terminated with a 50 Ohm terminator. All metal contacts are confirmed to be floating, not in contact with any other metal. Pictures to follow.
Comments related to this report
jeffrey.kissel@LIGO.ORG - 11:59, Tuesday 12 July 2022 (63906)
Picture of our very scientific breakout board system.

Please be patient -- THIS IS TEMPORARY. We expect to be able to get the measurements we need tomorrow, and pull this monstrosity out and restoring sanity by the end of the week.
Images attached to this comment
daniel.sigg@LIGO.ORG - 12:13, Tuesday 12 July 2022 (63910)

This is not a 50Ω RF circuit!!! Remove the terminators please.

I removed it just now.

jeffrey.kissel@LIGO.ORG - 08:42, Friday 09 September 2022 (64923)CDS, OpsInfo
This system of breakout + cable mess has been removed entirely as of Sep 09 2022; see LHO:64921.
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