aLIGO LHO Logbook

H1 SUS (CDS, DAQ, DetChar, ISC)

betsy.weaver@LIGO.ORG - posted 12:08, Tuesday 21 April 2015 - last comment - 16:30, Tuesday 21 April 2015(17975)

All SUS 18-bit DAC re-calibrated

After today's upgrade to RCG 2.9.1 we looked to see if the DAC AUTOCAL was successful using these procedural notes. The last check was done on the BSCs only a few weeks ago (alog 17597). During today's check, we found errors on h1susb123 again and also on h1sush56. Both show that the AUTOCAL failed for 1 of their DACs. As well, Kissel logged into LLO and found all AUTOCALs reported SUCCESS on all SUS front ends since their last computer restart.

The LHO errors were as follows:

controls@h1sush56 ~ 0$ dmesg | grep AUTOCAL
[   60.359217] h1iopsush56: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   65.510812] h1iopsush56: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   70.661410] h1iopsush56: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   75.813017] h1iopsush56: DAC AUTOCAL FAILED in 5134 milliseconds
[   80.963620] h1iopsush56: DAC AUTOCAL SUCCESS in 5134 milliseconds
[8443363.521348] h1iopsush56: DAC AUTOCAL SUCCESS in 5134 milliseconds
[8443368.669944] h1iopsush56: DAC AUTOCAL SUCCESS in 5133 milliseconds
[8443373.818544] h1iopsush56: DAC AUTOCAL SUCCESS in 5133 milliseconds
[8443378.967145] h1iopsush56: DAC AUTOCAL FAILED in 5133 milliseconds
[8443384.115739] h1iopsush56: DAC AUTOCAL SUCCESS in 5133 milliseconds

The first of the 2 above calibrations was the reboot 97 days ago, on Jan 14, 2015 when we upgraded to RCG 2.9.

________________________________________________________________

controls@h1susb123 ~ 0$ dmesg | grep AUTOCAL
[   61.101850] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   66.252460] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   71.833569] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[   77.416848] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   82.567454] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   87.718046] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   92.869668] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[   98.021279] h1iopsusb123: DAC AUTOCAL FAILED in 5134 milliseconds
[6643697.827654] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[6643702.976255] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[6643708.553386] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[6643714.130498] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[6643719.278911] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[6643724.427687] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[6643729.576295] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[6643734.724703] h1iopsusb123: DAC AUTOCAL FAILED in 5133 milliseconds
[8443632.920341] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[8443638.069031] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[8443643.646215] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[8443649.223336] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[8443654.371885] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[8443659.520452] h1iopsusb123: DAC AUTOCAL SUCCESS in 5134 milliseconds
[8443664.669135] h1iopsusb123: DAC AUTOCAL SUCCESS in 5133 milliseconds
[8443669.817631] h1iopsusb123: DAC AUTOCAL FAILED in 5133 milliseconds

The first of the 3 above calibrations was the reboot 97 days ago, on Jan 14, 2015 when we upgraded to RCG 2.9, then a restart/calibration by Kissel April 1 (mentioned above), then today's RCG 2.9.1 upgrade.

Comments related to this report

jeffrey.kissel@LIGO.ORG - 16:30, Tuesday 21 April 2015 (17989)DetChar

Link

J. Kissel, B. Weaver, D. Barker, R. McCarthy, and J. Batch

We've traced down which suspensions are *using* these DAC cards that always fail their calibration: susb123's is used by the ITM ESD, and sush56's is used by the bottom stage of SR3. Both are currently not used for any local or global control, so we don't *think* this should cause any glitches. 

@DetChar -- can you confirm this? I'm worried that when the DAC *noise* crosses zero, then there are still glitches.

Further -- Dave has confirmed that there are 18-bit DAC on the DAQ Test stand which fail the calibration, and those cards specifically appear to be of a different generation board that the ones that pass the calibration regularly. We suspect that this is the case on the H1 DAC cards as well. However, because they're not used by anything, we figure we'll wait until we *have* to swap out the SUS DACs for the newer-better, fixed-up EEPROM version of the board to investigate further. 

That's the plan so far. Stay tuned!