19/11/2025

~7h26 UTC : stop all WEB and NEB rotors

Test of vertical sensor of WSN: we swapped the lemo cable between WSN_vertical_pos and WSN_lateral_pos on the adc side and put them back in place:

• 7h35 :05-25 utc swaping lateral and vertical
• 7 :36 :00-15 utc swaping back to « nominal »
• Conclusion : looks like there was a lemo connector not properly plugged on the adc side. It is cured by this simple manipulation (see sensor pos plot)

Survey on WEB ( use names from wiki)

• Place jig bars under the platines and jig cylinder at the far jig position for WE(N,M,F) then WN(N,M,F). (7 :50 - 7 :52 UTC) (see Positioning_jigs_WE_WN.png)
• Move the counterweight of WN(NMF) platine around 8:54 (picture CounterWeight_WN.png) to enable the survey
• Survey for WE and WN
  • with Station 1
    • starts around 9:38 UTC and ends before 9:49 UTC. some position sensors changed when moving sphere to top of WNN rotor at gps=1447580619.
  • calibration of station 2 around 9:50 UTC
  • Measures with station 2 start at ~10:05 UTC
    • WE top, and WE near
    • move of counterweight (done just before 10:09:08 UTC 1447582166) to enable WE far measurement
    • WN near, far, top (in this order)
    • End at 10:12:03 UTC 
  • Turn WEN and WNN by 180° (ended at 10:21) (see image taken after rotation) . We noted that WNN is not completely stable on the table (some wobling).
  • Need to move again counterweight to measure WE points.
  • Start measure with station 2 and rotated rotors around10:21
    • first measured point (WEF before couterweight move)
    • WEN after couterweight move
    • WETop2
    • 10:25:14 WNN; 10:26:44 WNF ; 10:27:24 WNTop2
• Place jig bars under the platines and jig cylinder at the far jig position for WW(N,M,F) then WS(NMF) between ~10:35 UTC and 10:40 UTC
• Survey for WW and WS
  • Install and calibrate station 3 for WW survey
    • Start measurements at 11:20:58 (WWF, WWN, WWT) ended at 11:24:29
  • Install and calibrate station 4 for WW survey
    • Start measure ~11:39:22 WWN, WWT. End at 11:40:41
    • Rotate WWN by 180° (see picture of rotated rotor) between 11:40:41 and 11:4
    • Between 11:46 and 11:47, measure again WWN, then WWT2
  • Lunch break
  • 15:50 : start installation and calibrate startion 5 for WS survey at ~14:56
    • start measure WWF at 15:03:47; WWN at 15:05:35; WWT2 at 15:06:14... end at 15:07:15
    • WST at 15:08:13--> 15:09:07
    • rotate WSN --> 15:16? (rotor has now its electronic on "interior side" as the other rotors from WEB)
    • WST2 at 15:16-15:17 end of measure
• ~15:19 remove jigs from WW(N,M,F) and WS(NMF)

All rotors from WEB are now rotated by 180° compared to beginning of the day

Return to control room and restart all rotors at 2* nominal frequency @ around 16:05

To be continued on november 20.