Detector Characteristics
Read Out Noise: Recent values (ADU)
| Date \ Quadrant |
Lower Left |
Lower Right |
Upper Left |
Upper Right |
| May 13, 2005 |
2.239
|
2.113
|
2.117 |
2.092 |
| Jul 28, 2010 |
2.224
|
2.084
|
2.107 |
2.071 |
| May 22, 2011 |
2.226
|
2.091
|
2.104 |
2.083 |
Read-out Noise evolution since January 1998 (Last updated 2011-05-22).
Gain: Recent values (e-/ADU)
| Date |
Gain |
| May 23, 2005 |
5.271 |
| Jul 28, 2010 |
5.462 |
| May 22, 2010 |
5.385 |
Gain evolution since August 1998 (Last updated 2011-04-22).
Non-Linearity: Recent values
| Month |
Linearity
|
Sep 2003
| Less than 1.5% between 50 and 10000 ADUs |
Jul 28, 2010
| Less than 0.5% between 50 and 10000 ADUs |
Bad Pixels: Recen values
| Date |
Dead pixels |
Hot pixels |
Noisy pixels |
Total bad pixels |
Apr 2003*
|
9120
|
239
|
3577
|
9666
|
Dec 2008*
|
12760
|
228
|
749
|
13490
|
Jul 28 2010*
|
11725
|
261
|
669
|
12451
|
*Please note that the apparent increase in the number of bad pixels since April 2003
cannot fully be ascribed to a degradation of the array per se.
The number of dead pixels strongly depends on the shape of the vignetted area of the array
which has changed since Apr 2003. As the new bad pixel map is created independently of the
one from Apr 2003, the chosen accuracy for identifying bad pixels also affects the
number of dead, hot, and noisy pixels.
Note that some pixels fall into more than one category, i.e. hot and noisy, so the total
bad pixels count is less than the sum of the three previous columns.
Go to the bad pixel images (last updated 2010-05-22).
Last modified: 2011-05-22, V.D. Ivanov
