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CCD Quality Control

The bias value, readout noise, gain, and in the future also the linearity of the WFC CCDs are monitored by the Support Astronomers. SA, please update this table in any D nights and, if possible, also at the beginning of each observing run with a visiting astronomer. Report any anomalous value to the Operations team via a Fault report.

Date
 Readout Speed
 Bias (ADU)
 Readout Noise (ADU)
 Gain (e-/ADU)
CCD1
 CCD2
 CCD3
 CCD4
 CCD1
 CCD2
 CCD3
 CCD4
 CCD1
 CCD2
 CCD3
 CCD4
NOMINAL
(Sep 2011)
 slow 2072
 2220
 2216
 2162
 3.6
 2.6
 3.6
 2.8
 1.1
 1.5
 1.0
 1.4
2006-10-31
1555
 1503
 1552
 1571
 2.9
 4.3
 4.9
 3.3



2006-11-28
767
 813
 718
 725
 2.9
 2.2
 3.2
 2.5
 2.6
 3.2
 2.5
 3.1
2006-12-12
749
 804
 712
 722
 2.8
 2.0
 3.1
 2.5
 2.8
 3.2
 2.6
 3.2
2006-12-24
729
 793
 712
 724
 3.0
 2.2
 3.1
 2.4



2007-01-03
726
 784
 715
 728
 2.8
 2.2
 3.2
 2.5



2007-01-04
723
 790
 711
 724
 2.8
 2.0
 3.0
 2.3
 2.8
 3.2
 2.5
 3.1
2007-04-10
1944
 1931
 2016
 1934
 2.8
 2.1
 2.9
 2.4
 2.6
 3.2
 2.5
 3.1
2007-05-10
 fast
 1917
 1917
 1976
 1910
 3.4
 2.7
 3.5
 3.0
 2.6
 3.5
 2.6
 3.3
2007-05-10
 slow
 2218
 2246
 2288
 2219
 4.5
 3.2
 4.5
 3.4
 1.3
 1.7
 1.2
 1.6
2007-05-17
 fast
 1917
 1922
 1976
 1910
 3.7
 2.7
 3.6
 2.8
 2.6
 3.5
 2.5
 3.3
2007-05-17
 slow
 2218
 2251
 2290
 2222
 4.2
 3.5
 4.6
 3.5
 1.3
 1.7
 1.2
 1.6
2007-06-07
 fast
 1908
 1918
 1987
 1917







2007-07-14
 fast
 1896
 1915
 1960
 1910
 2.8
 2.2
 2.6
 2.5
 2.6
 3.5
 2.5
 3.3
2007-07-16
 slow
 2220
 2265
 2292
 2238
 4.4
 3.3
 4.0
 3.4
 1.3
 1.7
 1.2
 1.6
2007-11-07
 fast
 1897
 1912
 1965
 1900
 2.9
 2.3
 2.7
 2.6



2007-11-07
 slow
 2206
 2245
 2281
 2213
 4.3
 3.0
 3.8
 2.2
 1.3
 1.7
 1.2
 1.6
2008-01-16
 fast
 1894
 1908
 1960
 1899
 2.9
 2.5
 2.6
 2.6
 2.6
 3.4
 2.4
 3.2
2008-01-16
 slow
 2208
 2239
 2280
 2215
 4.9
 3.6
 4.0
 3.3
 1.3
 1.7
 1.2
 1.5
2008-01-22
 fast
 1893
 1908
 1960
 1900
 2.9
 2.4
 2.7
 2.7
 2.5
 3.4
 2.3
 3.2
2008-01-22
 slow
 2210
 2244
 2281
 2220
 4.9
 3.9
 3.9
 4.4
 1.3
 1.7
 1.2
 1.6
2008-11-26
 slow



3.3
 2.7
 2.8
 2.5



2011-06-17
 slow
 2059
 2201
 2204
 2156
 3.6
 2.5
 3.5
 2.7
 1.0
 1.3
 0.9
 1.2
2011-06-17
 fast
 1838
 1908
 1949
 1895
 2.6
 2.0
 2.7
 2.4
 2.4
 3.1
 2.2
 2.9
2011-07-03
 slow
 2072
 2219
 2216
 2167
 3.7
 2.6
 3.6
 2.8
 1.1
 1.5
 1.0
 1.4
2011-07-03
 fast
 1853
 1925
 1959
 1906
 2.7
 2.0
 2.7
 2.4
 2.7
 3.6
 2.6
 3.4
2011-09-10
 slow
 2072
 2226
 2217
 2165
 3.6
 2.5
 3.6
 2.8
 1.3
 1.7
 1.2
 1.6
2011-09-10
 fast
 1851
 1931
 1959
 1904
 2.4
 2.0
 2.6
 2.3
 2.4
 3.2
 2.3
 3.0
2011-11-11
 slow
 2046
 2169
 2221
 2141
 8.0
 10.6
 7.8
 5.9
 1.2
 1.6
 1.1
 1.5
2011-11-11
 fast
 1821
 1873
 1953
 1882
 7.1
 6.0
 7.6
 5.5
 1.5
 2.0
 1.4
 1.9


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WFC Instrument Specialist
Last modified: 02 December 2011