stefan.ballmer@LIGO.ORG - posted 16:55, Tuesday 26 January 2016 - last comment - 14:36, Wednesday 27 January 2016(25183)
ETM ESD DAC output --- what?
Jim, Evan Does this behavior of the ETM ESD DAC outputs make sense? Here a large offset has been applied to the UL coil output filter. However, the screen suggests that it's being applied to the UR DAC channels. This behavior is seen on both ETM ESD DACs, but not the ITM ESD DACs.
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Hi Stefan,
It seems that the medm screen is not up-to-date. According to page 6 of D1002741-v10, the DAC order should be in BIAS, UR, LR, UL and LL starting from smaller channel number for the ESDs. The front end models (i.e. h1susetmx and h1susetmy) follow exactly what the document says, but the medm screen does not.
J. Kissel, S. Aston The MEDMs were suffering from poorly updated macro substitution files, and other issues that was a result of the last minute addition of the LVLN driver before ER8. Stuart had fixed this problem at LLO months ago (see LLO aLOGs 18819 and 19356), but in the heat of battle at the start of the run we never imported the updates here. A simple svn up of the /opt/rtcds/userapps/release/sus/common/medm/ has solved the problem. Indeed, I've taken it one step further, and modified /opt/rtcds/userapps/release/sus/common/medm/quad/SUS_CUST_QUAD_L3_ESDOUTF.adl to reflect the same order as what is shown on the overview screen. Attached is a replica of the above screenshot, but with the fixed MEDM structure.
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