Changes between Version 3 and Version 4 of PublicPages/MayallZbandLegacy/NotesforObservers/Problems
- Timestamp:
- Feb 5, 2016 12:20:48 AM (9 years ago)
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PublicPages/MayallZbandLegacy/NotesforObservers/Problems
v3 v4 3 3 4 4 5 '''1. Images show bad amp''' 5 === 1. Images show bad amp === 6 6 7 7 This is usually diagnosed by an amp appearing “dead”, having very large noise (mscstat results in rms > ~ 1000 adu/pix). … … 12 12 Then take two zero images. The first image is always bad. The second should be ok. Check it using mscstat <filename> once it has read out. All rms values should be between 4-7 adu (except for amps 6 and 14, which may be ~8-10). 13 13 14 '''2. 4MAPS system goes “OFF AIR” during observing''' 14 === 2. 4MAPS system goes “OFF AIR” during observing === 15 16 [[Image(4MAPS_gui.tiff, 400px)]] 17 15 18 16 19 OA should notice this, but you can keep track of the mirror support system on the 4MAPS gui. If it says “OFF AIR”, the mirror is off air! … … 23 26 - Once the OA has reset 4MAPS, you can restart the script. The telescope will slew to your position and start the exposure. 24 27 25 '''3. Shifted images''' 28 === 3. Shifted images === 26 29 27 30 Every now and then, an image appears which shows a shifted region in one or more CCDs. Please log this. You can identify images with shifts by running … … 32 35 33 36 34 '''4. Repeat images''' 37 === 4. Repeat images === 35 38 36 39 This is very hard to diagnose, and requires you paying attention to the images, and occasionally running the command: … … 55 58 Log all the images that had identical READTIME values. 56 59 57 '''5. Focus drifting''' 60 === 5. Focus drifting === 58 61 59 62 If you lose track of the focus and don’t know whether you are below or above the focus value, stop the observing script by using CTRL-C, waiting for the readout to complete and the “DONE” to appear on the NMSL window, and then execute … … 72 75 - Restart observing 73 76 74 '''6. Images of stars on the guider are bouncing around''' 77 === 6. Images of stars on the guider are bouncing around === 75 78 - If the wind is high, ask the OA to close the louvers
