Installed the ESD drive at EY. The interlock to the Pressure Gauge functions properly. Again had a problem the a Neg HV supply. Similar to EX the unit powered up and worked for a while then tripped off and never turned back on. Replaced it and everything seems to be working. Drove excitations through the ESD out filterbank and saw signals on the oplev. Left further testing to Kiwamu. I was not completely satisfied with our results.
I was asked by Richard to check the functionality of the ESD of ETMY. As he wasn't satisfied with the behavior of the ESD, I wasn't satisfied either.
The attached is a note of how the test mass reacted against a positive DC voltage applied on each quadrant, observed by the optical lever:
The test mass reacted as if the UR and LR channels are swapped (or LL and LR are swapped). For example, applying a positive voltage on UR should pitch the test mass downward since UL pitches it downward, but it is not. Also the reaction of LL seemed a bit smaller than the others. Anyway, something is wrong apparently. Note that I applyed 125 k counts of offset on the DC bias.
Because we are now in a commissioning mood, we are not going to test this any further tonight. This should be assessed tomorrow morning or so.