DMI Piston measurement procedure

• end of night stack (turn off Quincy once structure is at CCAS)
• SAMS reference is set
• dome/louvers closed, AHUs running with chiller set to current internal temperature, no structure motion!!
• then run the wrapper script: DMISweep.sh
  • first it moves tracker to center
  • Tip/Tilt metrology loop should be started (by the script, and stopped too), but not Active
  • script will ask to set Tip/Tilt fiducial - click "Clear Fiducial" in TCS GUI - then press Enter
  • it will tell you which head it is using (DMI fiber switcher)
  • it will ask you to get the DMI head ready on DMI computer
    • KVM or remote access to DMI computer
    • DMI Server GUI
      • click on Exec Control to get a light green light on it
    • Dim LIS GUI:
      • click "Source Adjust"
        • if the source level percentage window is greyed out (after a restart), press Ctrl+F7
        • adjust top value of source level percentage until the top Measured Power is about 0.09 micro-Watts
        • center head is usually 15.8%, other heads are 12-13%
        • too small of a change may have no effect
        • Click "OK" when it's good
      • in Main GUI, click "Measure" and make sure signal amplitude is at least 1 V, or a little more is OK.
    • DMI Server GUI
      • click on Exec Control to turn it grey again
  • press Enter on script since the DMI is ready
  • script runs for about an hour as it measures the sequence of segments for this head
  • if it freezes on a mirror and doesn't get a measurement, check if PAS has crashed
    • can restart PAS, then "start metrology loop" on ~Tip/Tilt camera tab, then Nathan's script should receive it and continue with the measurements
  • if tracker aborts or fails after the first head is done, probably better to give up
  • then it runs the second DMI head (you'll need to adjust the power); then runs third DMI head (adjust the power again)
  • script moves tracker to center and aborts it
  • after all three heads are finished, a matplotlib plot appears; close the window with the X in the corner to continue
• then can turn on the Quincy again
• click "Stow" on Structure and Dome tabs
• move tracker to low center (home) and abort it
• turn off Quincy once finished