Telescope configurations and exposure time for SuNSS flat

• Telescope
  • Telescope pointing to the zenith
  • Mirror cover closed (we don't use the telescope itself)
  • Dome main shutter closed
  • Set the top screen positions to the dome flat observation position for HSC (one in the front side, and the rest two in the rear side). 
  • Dome Flat (trace): Turn on 4 120V lamps, with maximum current. Turn off the dome inside illumination and lock the dome.
  • Room Light (arc): Turn on all room lamps.
• Dome exposure time
  • b and r : 5 sec x 10--20 frames
  • b and m : 8 sex x 10–20 frames
• Arc exposure time
  • b and r : 10 sec x 4 frames
  • b and m : 9 sec x 4 frames

Note: the top screen positions are not normal for day-time work. So we took data (b and m, 9sec and 20 sec) with the screen away to compare the signal and scale exposure time in this configuration.