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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
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: 27 March 2024