Changes between Version 11 and Version 12 of PublicPages/MayallZbandLegacy/NotesforObservers/Problems
- Timestamp:
- Feb 5, 2016 1:36:24 PM (8 years ago)
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PublicPages/MayallZbandLegacy/NotesforObservers/Problems
v11 v12 3 3 4 4 5 === 1. Images show bad amp === 5 === 1. Count-down timer counting negative and no new images read === 6 7 '''Problem:''': Count-down timer keeps counting down negative numbers, and no new images are read. 8 9 '''Frequency''': Several times per night in the early Feb 2016 run. 10 11 '''Fix:''' 12 13 === 2. Images show bad amp === 6 14 7 15 This is usually diagnosed by an amp appearing “dead”, having very large noise (mscstat results in rms > ~ 1000 adu/pix). … … 14 22 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). 15 23 16 === 2. 4MAPS system goes “OFF AIR” during observing ===24 === 3. 4MAPS system goes “OFF AIR” during observing === 17 25 18 26 [[Image(4MAPS_gui.tiff, 400px)]] … … 28 36 - Once the OA has reset 4MAPS, you can restart the script. The telescope will slew to your position and start the exposure. 29 37 30 === 3. Shifted images ===38 === 4. Shifted images === 31 39 32 40 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 … … 39 47 Images with pixel shifts are now marked on the obsbot/copilot display 40 48 41 === 4. Repeat images ===49 === 5. Repeat images === 42 50 43 51 This is very hard to diagnose, and requires you to pay attention to the obsbot/copilot output, the individual images, and occasionally running the command: … … 64 72 Log all the images that had identical READTIME values. 65 73 66 === 5. Detector Timeouts ===74 === 6. Detector Timeouts === 67 75 68 76 Occasionally, the numbers on the countdown timer on the NMSL GUI will turn red during readout, and the timer will read down to -105 or so. … … 74 82 However, pay attention to make sure that the next few images are written out. 75 83 76 === 6. Focus drifting ===84 === 7. Focus drifting === 77 85 78 86 If you lose track of the focus and don’t know whether you are below or above the focus value, wait for the readout countdown to start … … 102 110 - Restart observing 103 111 104 === 7. Images of stars on the guider are bouncing around ===112 === 8. Images of stars on the guider are bouncing around === 105 113 - If the wind is high, ask the OA to close the louvers
