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Home > Astronomy > Wide Field Camera > WFC CCD Quality Control

Detector Quality Control

The linearity of the four CCDs can be checked at the the WFC linearity page.

The bias value, readout noise, gain are checked on discretionary nights. The following table include measurements in binning 1x1, for both slow and fast readout modes. Similar values are obtained for binning 2x2 except for CCD2 where the noise is about 30 times higher. Thus, binning 2x2 mode could be used safely with the other three CCDs or a smaller window of the central CCD4. The automatic detector quality control pages .

The following plots show the WFC bias, gain and noise historic values, as read from the table using a Python script created by the 2018/19 ING student Thomas Davison.




Date
 Readout
Speed
 Bias (ADU)
 Readout Noise (ADU)
 Gain (e-/ADU)
CCD1
 CCD2
 CCD3
 CCD4
 CCD1
 CCD2
 CCD3
 CCD4
 CCD1
 CCD2
 CCD3
 CCD4
NOMINAL
(2023-07-13)
 slow 2143
 2267
 2284
 2221
 4.4
 2.6
 3.4
 2.7
 1.2
 1.7
 1.2
 1.6
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
2012-09-29
 slow
 2107
 2228
 2242
 2164
 4.6
 2.8
 3.9
 3.1
 1.1
 1.5
 1.1
 1.5
2012-09-29
 fast
 1906
 1943
 1986
 1911
 3.0
 2.1
 2.7
 2.2
 0.6
 0.8
 0.5
 0.7
2012-11-05
 slow
 2117
 2217
 2288
 2197
 4.5
 2.7
 3.8
 3.0
 1.2
 1.7
 1.3
 1.6
2012-11-05
 fast
 1912
 1940
 1982
 1910
 3.3
 2.2
 2.8
 2.3
 1.9
 2.5
 1.8
 2.4
2013-02-01
 slow
 2060
 2172
 2217
 2148
 6.6
 4.0
 4.3
 3.6
 1.2
 1.6
 1.2
 1.5
2013-02-01
 fast
 1881
 1907
 1977
 1908
 3.9
 2.3
 2.6
 2.6
 2.1
 2.8
 2.1
 2.7
2013-04-05
 slow
 2092
 2195
 2231
 2168
 4.6
 2.7
 3.3
 2.6



2013-04-05
 fast
 1897
 1915
 1977
 1910
 2.9
 1.9
 2.2
 1.9



2013-06-03
 slow
 2103
 2218
 2239
 2176
 4.5
 2.7
 3.5
 2.9
 1.2
 1.7
 1.2
 1.6
2013-06-03
 fast
 1906
 1930
 1981
 1921
 3.2
 2.3
 2.5
 2.2
 2.5
 3.4
 2.5
 3.3
2013-10-15
 slow
 2087
 2190
 2255
 2178
 4.3
 2.7
 3.6
 3.0
 1.1
 1.5
 1.1
 1.4
2013-10-15
 fast
 1908
 1925
 2014
 1941
 3.4
 2.3
 2.8
 2.5
 2.1
 2.8
 2.1
 2.7
2013-11-27
 slow
 2103
 2218
 2239
 2176
 5.5
 4.5
 4.6
 4.9
 1.2
 1.7
 1.2
 1.6
2013-11-27
 fast
 1906
 1930
 1981
 1921
 8.0
 7.2
 7.4
 9.1
 2.6
 3.4
 2.5
 3.3
2014-02-20
 slow
 2070
 2205
 2264
 2192
 4.9
 2.8
 4.0
 3.4
 1.2
 1.6
 1.2
 1.5
2014-02-20
 fast
 1896
 1931
 2019
 1942
 3.4
 2.2
 2.8
 2.5
 0.8
 1.0
 0.7
 1.0
2014-03-18
 slow
 2083
 2207
 2252
 2200
 4.8
 2.8
 3.9
 3.4
 1.0
 1.3
 1.0
 1.3
2014-03-18
 fast
 1906
 1932
 2016
 1950
 3.4
 2.3
 3.0
 2.7
 0.5
 0.7
 0.5
 0.6
2014-06-23
 slow
 2073
 2202
 2256
 2196
 4.8
 2.8
 3.8
 3.3
 1.2
 1.7
 1.2
 1.6
2014-06-23
 fast
 1902
 1932
 2010
 1947
 3.5
 2.4
 3.0
 2.7
 2.5
 3.4
 2.5
 3.3
2014-07-28
 slow
 2088
 2228
 2270
 2205
 4.7
 2.8
 3.8
 3.2
 1.2
 1.7
 1.2
 1.6
2014-07-28
 fast
 1903
 1939
 2016
 1946
 3.5
 2.3
 2.9
 2.5
 2.5
 3.4
 2.5
 3.3
2014-10-13
 slow
 2093
 2247
 2285
 2211
 4.8
 2.8
 3.8
 3.2
 1.2
 1.7
 1.2
 1.6
2014-11-02
 slow
 2071
 2216
 2293
 2232
 4.7
 2.7
 3.6
 2.9
 1.2
 1.7
 1.2
 1.6
2014-11-02
 fast
 1936
 1947
 2040
 1959
 3.6
 2.4
 3.1
 2.8
 2.6
 3.5
 2.6
 3.4
2014-11-19
 slow
 2116
 2229
 2284
 2210
 5.0
 2.9
 3.9
 3.3
 1.2
 1.7
 1.2
 1.6
2014-11-19
 fast
 1932
 1949
 2035
 1960
 3.6
 2.4
 3.1
 2.8
 2.6
 3.4
 2.4
 3.3
2014-12-15
 slow
 2124
 2227
 2292
 2214
 5.0
 2.8
 3.8
 3.1
 1.2
 1.7
 1.2
 1.6
2014-12-15
 fast
 1942
 1942
 2043
 1956
 3.7
 2.5
 3.3
 2.7
 2.7
 3.5
 2.6
 3.4
2015-01-14
 slow
 2135
 2222
 2313
 2217
 5.1
 2.9
 4.0
 3.2
 1.2
 1.7
 1.5
 1.6
2015-01-14
 fast
 1942
 1942
 2043
 1956
 3.7
 2.5
 3.3
 2.7
 2.7
 3.5
 2.6
 3.4
2015-01-28
 slow
 2080
 2199
 2230
 2179
 7.7
 5.6
 6.7
 5.0
 1.2
 1.7
 1.2
 1.6
2015-01-28
 fast
 1895
 1914
 1978
 1924
 5.9
 5.0
 6.4
 4.9
 2.6
 3.4
 2.6
 3.3
2015-08-04
 slow
 2129
 2287
 2304
 2230
 4.7
 2.9
 4.0
 3.3
 1.2
 1.7
 1.2
 1.6
2015-08-04
 fast
 1929
 1980
 2038
 1969
 3.6
 2.4
 3.2
 2.9
 2.6
 3.5
 2.6
 3.4
2015-10-13
 slow
 2140
 2250
 2279
 2216
 4.9
 2.9
 3.9
 3.2
 1.2
 1.7
 1.2
 1.6
2015-10-13
 fast
 1941
 1957
 2023
 1959
 3.7
 2.5
 3.1
 2.8
 2.6
 3.4
 2.5
 3.3
2016-02-02
 slow
 2108
 2238
 2277
 2212
 5.2
 2.7
 3.6
 3.1
 1.2
 1.7
 1.2
 1.6
2016-02-02
 fast
 1934
 1961
 2033
 1966
 3.3
 2.0
 3.1
 2.3
 2.6
 3.4
 2.3
 3.4
2016-03-10
 slow
 2101
 2235
 2266
 2207
 4.9
 2.7
 3.6
 3.1
 1.2
 1.7
 1.5
 1.6
2016-03-10
 fast
 1928
 1957
 2031
 1962
 3.2
 1.9
 2.3
 2.2
 2.6
 3.5
 2.5
 3.3
2016-10-16
 slow
 2114
 2212
 2282
 2211
 5.1
 2.6
 3.4
 2.9
 1.2
 1.7
 1.2
 1.6
2016-10-13
 fast
 1930
 1956
 2028
 1964
 3.6
 2.2
 2.6
 2.3
 2.5
 3.4
 2.5
 3.2
2016-11-22
 slow
 2096
 2205
 2256
 2200
 4.6
 2.5
 3.3
 2.7
 1.2
 1.7
 1.2
 1.6
2016-11-22
 fast
 1908
 1929
 2010
 1947
 3.2
 1.9
 2.2
 2.0
 2.6
 3.4
 2.6
 3.3
2017-02-10
 slow
 2080
 2203
 2253
 2193
 4.6
 2.5
 3.4
 2.9
 1.2
 1.7
 1.2
 1.6
2017-02-10
 fast
 1907
 1932
 2016
 1949
 3.2
 1.9
 2.3
 2.2
 2.5
 3.4
 2.6
 3.3
2017-07-06
 slow
 2096
 2222
 2250
 2198
 4.3
 2.4
 3.3
 2.7
 1.3
 1.7
 1.3
 1.7
2017-07-06
 fast
 1911
 1939
 2008
 1946
 3.0
 1.9
 2.2
 2.0
 2.6
 3.5
 2.5
 3.4
2017-08-16
 slow
 2106
 2247
 2271
 2210
 4.8
 2.5
 3.5
 2.8
 1.2
 1.6
 1.2
 1.6
2017-08-16
 fast
 1919
 1951
 2008
 1948
 4.0
 2.0
 2.5
 2.6
 2.5
 3.4
 2.5
 3.2
2018-09-21
 slow bin 1x1
 2082
 2239
 2259
 2210
 4.8
 2.8
 4.1
 3.3
 1.3
 1.7
 1.2
 1.6
2018-09-21
 fast bin 1x1
 1891
 1940
 1994
 1941
 3.4
 2.3
 3.1
 2.6
 2.6
 3.5
 2.4
 3.5
2018-09-21
 slow bin 2x2
 2163
 2761
 2199
 2113
 5.5
 52.2
 4.9
 6.6
 1.2
 2.3
 1.1
 1.9
2018-09-21
 fast bin 2x2
 1917
 2146
 1942
 1865
 7.5
 58.1
 7.2
 12.2
 2.4
 5.1
 2.3
 4.7
2019-01-22
 slow
 2112
 2193
 2224
 2139
 5.2
 2.9
 4.0
 2.9
 1.2
 1.7
 1.2
 1.6
2019-04-30
 slow
 2112
 2217
 2246
 2173
 5.5
 3.0
 4.2
 3.2
 0.8
 1.2
 0.4
 1.1
2019-04-30
 fast
 1941
 1952
 2017
 1932
 5.7
 3.9
 4.2
 3.1
 2.5
 3.4
 2.2
 3.3
2019-06-13
 slow
 2134
 2265
 2275
 2207
 6.3
 5.2
 5.2
 6.0
 1.2
 1.7
 1.2
 1.6
2019-06-13
 fast
 1949
 1977
 2032
 1953
 21.2
 19.0
 13.2
 12.3
 2.6
 3.5
 2.6
 3.4
2019-06-21
 slow
 2131
 2261
 2270
 2205
 5.0
 3.7
 4.0
 3.0
 1.2
 1.7
 1.2
 1.6
2019-06-21
 fast
 1946
 1971
 2027
 1950
 3.9
 2.7
 3.2
 2.5
 2.6
 3.5
 2.6
 3.4
2019-08-12
 slow
 2135
 2257
 2271
 2210
 6.0
 4.8
 4.7
 4.5
 1.2
 1.6
 1.2
 1.6
2019-08-12
 fast
 1943
 1964
 2019
 1947
 8.8
 8.2
 7.1
 7.5
 2.5
 3.3
 2.4
 3.2
2019-10-18
 slow
 2127
 2247
 2262
 2203
 6.1
 5.0
 4.8
 4.8
 1.2
 1.7
 1.2
 1.6
2019-10-18
 fast
 1945
 1962
 2025
 1952
 14.2
 13.8
 7.5
 9.7
 2.5
 3.4
 1.9
 3.3
2019-10-25
 slow bin 1x1
 2131
 2257
 2266
 2203
 4.9
 2.8
 4.0
 2.9
 1.2
 1.6
 1.2
 1.6
2019-10-25
 fast bin 1x1
 1950
 1973
 2030
 1955
 4.0
 2.4
 3.0
 2.4
 2.5
 3.4
 2.5
 3.2
2019-10-25
 slow bin 2x2
 2178
 2903
 2233
 2157
 258
 155
 244
 200
 0.5
 0.9
 0.5
 0.7
2019-10-25
 fast bin 2x2
 1914
 2143
 1953
 1897
 84
 50
 83
 64
 2.3
 4.4
 2.3
 3.4
2019-12-23
 slow
 2132
 2256
 2278
 2205
 5.9
 4.6
 4.8
 4.6
 1.2
 1.7
 1.2
 1.5
2019-12-23
 fast
 2132
 2256
 2278
 2205
 8.4
 6.3
 6.5
 6.3
 1.7
 2.3
 1.6
 2.2
2020-01-16
 slow
 2106
 2210
 2246
 2169
 6.5
 5.0
 4.9
 4.9
 1.2
 1.7
 1.2
 1.6
2020-01-16
 fast
 1941
 1954
 2023
 1938
 9.5
 8.3
 7.5
 8.1
 2.6
 3.5
 2.5
 3.4
2020-02-05
 slow
 2117
 2237
 2258
 2190
 6.1
 4.8
 5.1
 5.0
 1.2
 1.7
 1.2
 1.6
2020-02-05
 fast
 1943
 1964
 2022
 1944
 9.3
 8.4
 7.6
 8.3
 2.7
 3.5
 2.6
 3.5
2020-09-20
 slow
 2134
 2303
 2283
 2219
 4.8
 4.6
 4.0
 3.0
 0.8
 1.1
 0.3
 3.0
2020-09-20
 fast
 1936
 1981
 2024
 1952
 7.0
 4.7
 4.8
 6.0
 2.7
 3.5
 2.6
 3.5
2020-10-06
 slow
 2159
 2249
 2306
 2209
 4.8
 2.9
 4.0
 3.1
 1.2
 1.7
 1.2
 1.6
2020-10-06
 fast
 1959
 1963
 2038
 1951
 3.8
 2.5
 3.1
 2.6
 2.6
 3.5
 2.6
 3.4
2021-08-26
 slow
 2147
 2274
 2290
 2220
 4.9
 2.7
 3.4
 2.7
 1.2
 1.7
 1.2
 1.6
2021-08-26
 fast
 1956
 1982
 2042
 1964
 3.4
 2.0
 2.7
 2.0
 2.5
 3.4
 2.4
 3.2
2021-11-19
 slow
 2137
 2248
 2290
 2213
 4.8
 2.6
 3.3
 2.5
 1.2
 1.6
 1.2
 1.6
2021-11-21
 fast
 1974
 1971
 2080
 1969
 3.7
 2.0
 2.4
 2.0
 2.6
 3.5
 2.6
 3.4
2022-01-04
 slow
 2145
 2256
 2279
 2213
 5.1
 2.7
 3.4
 2.6
 1.2
 1.7
 1.2
 1.6
2022-01-24
 slow
 2155
 2242
 2283
 2208
 5.1
 2.7
 3.7
 2.7
 1.3
 1.7
 1.2
 1.6
2022-01-24
 fast
 1970
 1966
 2038
 1958
 3.5
 2.0
 2.5
 2.1
 2.6
 3.5
 2.6
 3.3
2022-04-18
 slow
 2142
 2258
 2284
 2213
 4.7
 2.7
 3.3
 2.6
 1.0
 1.2
 1.0
 1.1
2022-04-18
 fast
 1959
 1971
 2035
 1957
 3.2
 1.9
 2.3
 2.0
 2.6
 3.4
 2.3
 3.3
2022-05-15
 slow
 2138
 2255
 2282
 2212
 4.8
 2.8
 3.5
 2.7
 1.2
 1.7
 1.2
 1.6
2022-06-23
 slow
 2125
 2233
 2274
 2200
 4.7
 2.6
 3.4
 2.6
 1.2
 1.7
 1.2
 1.6
2022-11-13
 slow
 2111
 2203
 2255
 2185
 5.1
 2.6
 3.4
 2.6
 0.9
 1.1
 0.9
 1.0
2022-11-13
 fast
 1939
 1940
 2026
 1943
 2.6
 3.4
 2.4
 3.3
 3.3
 1.9
 2.3
 2.0
2022-12-13
 slow
 2141
 2242
 2277
 2213
 5.0
 2.8
 3.5
 2.7
 1.2
 1.7
 1.2
 1.6
2023-01-12
 slow
 2136
 2235
 2282
 2212
 6.4
 4.0
 4.5
 3.2
 0.7
 0.8
 0.7
 0.7
2023-01-12
 fast
 1953
 1959
 2036
 1956
 7.4
 5.0
 4.6
 3.5
 1.6
 2.3
 0.6
 2.2
2023-01-29
 slow
 2132
 2234
 2277
 2199
 4.6
 2.6
 3.4
 2.6
 1.2
 1.7
 1.2
 1.6
2023-01-29
 fast
 1948
 1956
 2029
 1947
 3.9
 2.1
 2.3
 1.9
 2.6
 3.4
 2.5
 3.3
2023-07-13
 slow
 2129
 2232
 2281
 2200
 4.6
 2.6
 3.5
 2.6
 1.2
 1.7
 1.2
 1.6
2023-07-13
 slow
 2143
 2267
 2284
 2221
 4.4
 2.6
 3.4
 2.7
 1.2
 1.7
 1.2
 1.6
2023-05-11
 fast
 1941
 1964
 2026
 1949
 3.5
 2.1
 2.6
 2.2
 2.5
 3.4
 2.4
 3.3
2023-12-28
 slow
 2132
 2246
 2280
 2206
 5.0
 2.9
 3.6
 2.8
 1.2
 1.7
 1.2
 1.6
2024-03-07
 slow
 2128
 2225
 2275
 2195
 4.8
 2.8
 3.5
 2.7
 1.2
 1.7
 1.2
 1.6
2024-03-07
 fast
 1948
 1949
 2030
 1944
 4.0
 2.1
 2.5
 2.2
 2.6
 3.5
 2.6
 3.4
2024-03-18
 slow
 2142
 2245
 2288
 2210
 5.3
 3.0
 3.6
 2.8
 1.2
 1.7
 1.2
 1.6
2024-03-18
 fast
 1950
 1958
 2034
 1950
 7.6
 5.0
 4.5
 3.3
 2.6
 3.5
 2.6
 3.4
2024-06-01
 fast
 1944
 1964
 2034
 1955
 3.4
 2.2
 2.5
 2.1
 2.6
 3.5
 2.6
 3.4
2024-06-01
 slow
 2135
 2255
 2282
 2217
 4.6
 2.7
 3.4
 2.7
 1.25
 1.7
 1.25
 1.6
Date
 Readout
Speed
 Bias (ADU)
 Readout Noise (ADU)
 Gain (e-/ADU)
CCD1
 CCD2
 CCD3
 CCD4
 CCD1
 CCD2
 CCD3
 CCD4
 CCD1
 CCD2
 CCD3
 CCD4


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Contact:  (WFC Instrument Specialist)
Last modified: 02 June 2024
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