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Darks and hot pixel masks after cool downs and software changes
March 2001 - August 2001
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Gain |
5.3 e-/ADU |
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Readnoise |
26-45 e- |
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Full-well capacity |
22000 ADU |
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Pixel scale |
0.238"/pix (Cassegrain focus) |
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Readout time |
0.864s (timing error corrected) |
May 2000-February 2001
|
Gain |
5.3-6.4 e-/ADU |
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Readnoise |
37-65 e- |
|
Full-well capacity |
28000 ADU |
|
Pixel scale |
0.242"/pix ( (Cassegrain focus, with old foreoptics) |
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Readout time |
0.896s (timing error corrected) |
Darks and hot pixel masks after cool downs and software changes
Note that these are for documentation only. The observer is supposed to acquire his own darks and bad pixel masks.
- date: 27-Mar-2003 (after the accidental but incomplete warm-up of INGRID); INGRID @ Cass, CCC off - only LN2 but 2 cans
array temperature: 79.0 K
readout noise (post-pre): 8 adu (~32 e-)
number of hot pixels (in 10s): 7617 (0.73%). Per quadrants: 0.35%, 0.36%, 1.1% and 1.1% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
- date: 6-Feb-2003 (after warming up and cooling down the 30th January 2003, to install the new LN2 can); INGRID @ Cass, CCC off - only LN2 but 2 cans
array temperature: 80.2 K
readout noise (post-pre): 5.2 adu (~21 e-)
number of hot pixels (in 9.8s): 8006 (0.76%). Per quadrants: 0.50%, 0.47%, 1.07% and 1.01% of the pixels are hot in quadrants left-up, right-up,right-down and left-down respectively
- date: 17-May-2002 (after cooling down on the 21st March 2002); INGRID @ Ghril but CCC working
array temperature: 71.8 K
readout noise (post-pre): 5.1 adu (~20 e-)
number of hot pixels (in 9.8s): 3961 (0.38%). Per quadrants: 0.19%, 0.21%, 0.57%, and 0.54% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
- date: 5-Sept-2001 (just after the change to UltraDas)
array temperature: not recorded
readout noise (post-pre): 4.9 adu (~19 e-)
number of hot pixels (in 10s): 6094 (0.6%). Per quadrants: 0.47%, 0.37%, 0.79% and 0.69% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively
- date: 2-May-2001
array temperature: 71.4 K
readout noise (post-pre): 5.7 adu (~30 e-)
number of hot pixels (in 10.86s): 5014 (0.48%). Per quadrants: 0.63%, 0.67%, 0.31%, and 0.29% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively.
Note: There is a rotation of 180° in the images taken before Ultradas (i.e. before 1-Sep-2002) with respect to the images taken before that date.
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