Reports until 19:29, Tuesday 05 March 2019
H1 ISC (CDS, PEM)
peter.fritschel@LIGO.ORG - posted 19:29, Tuesday 05 March 2019 (47323)
Effect of EX ESD electronics isolation: IO fan frequencies no longer in DARM

In 46983 and 46083 Robert showed that the fan frequencies of the IO chassis at EX were showing up in DARM. After the work today that electrically isolated the EX ESD electronics from the rack it is installed in, it appears that this coupling has gone away.

The EX ESD isolation seems to be a good move, and should be considered for the Y end as well.

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