The bias value, readout noise and gain are monitored by the Support Astronomers for both available cameras EEV10 (blueish lines) and Red+2 (reddish lines).

SA, please take measurements of these values in D nights and, if possible, also at the beginning of each observing run with a visiting astronomer, and send them to the IDS instrument specialist. Report any anomalous value to the Operations Team via a Fault Report.

Results of the CCD linearity measurements can be found on D-tests results web-pages. There are more records in the automatic detetctor quality control pages.

The following plots show historic values of the bias, readout noise and gain for the two CCDs EEV10 and Red+2, as read from the table using a Python script created by the 2018/2019 ING student Thomas Davison.

CCD	Date	Read mode	Binning	Bias	Noise (ADU)	Gain (e-/ ADU)
EEV10	Nominal	Slow	1x1	1955	3.5	2.1
RED+2	Nominal	Slow	1x1	3720	5.5	0.95
RED+2	15 Oct 2011	Slow	1x1	3739	3.01	0.97
RED+2	15 Oct 2011	Fast	1x1	2991	2.35	1.94
RED+2	15 Oct 2011	Slow	2x2	3688	3.19	0.94
RED+2	15 Oct 2011	Fast	2x2	2975	2.42	1.93
RED+2	3 Feb 2012	Slow	1x1	3661	3.92	1.06
RED+2	3 Feb 2012	Fast	1x1	2928	4.81	2.18
RED+2	3 Feb 2012	Slow	2x2	3650	3.92	1.03
RED+2	3 Feb 2012	Fast	2x2	2948	4.66	2.10
RED+2	3 Apr 2012	Slow	1x1	3694	2.91	1.51
RED+2	3 Apr 2012	Fast	1x1	2979	1.84	0.68
RED+2	7 May 2012	Slow	1x1	3732	2.86	0.99
RED+2	7 May 2012	Fast	1x1	3009	4.78	2.12
RED+2	7 May 2012	Slow	2x2	3687	2.85	0.95
RED+2	7 May 2012	Fast	2x2	2985	4.40	1.91
EEV10	20 Jun 2012	Slow	1x1	2036	4.00	1.21
EEV10	28 Aug 2012	Slow	1x1	2287	4.47	1.36
EEV10	28 Aug 2012	Fast	1x1	1560	5.72	2.83
EEV10	28 Aug 2012	Slow	2x2	2397	5.19	1.30
EEV10	28 Aug 2012	Fast	2x2	1960	6.11	2.71
Red+2	23 Oct 2012	Slow	1x1	3814	3.71	1.09
Red+2	23 Oct 2012	Fast	1x1	3014	5.98	2.27
Red+2	23 Oct 2012	Slow	2x2	3940	3.49	1.07
Red+2	23 Oct 2012	Fast	2x2	3096	5.86	2.24
Red+2	21 Dec 2012	Slow	1x1	3819	2.96	0.91
Red+2	21 Dec 2012	Fast	1x1	3006	5.47	2.01
Red+2	22 Dec 2012	Slow	1x1	3800	3.06	0.97
Red+2	22 Dec 2012	Fast	1x1	3009	4.88	2.08
Red+2	23 Dec 2012	Slow	1x1	3816	3.18	0.97
Red+2	23 Dec 2012	Fast	1x1	3004	5.63	2.06
Red+2	23 Dec 2012	Slow	2x2	3907		0.93
Red+2	23 Dec 2012	Fast	2x2	3079	4.56	1.90
Red+2	24 Dec 2012	Slow	1x1	3808	3.03	0.91
Red+2	24 Dec 2012	Fast	1x1	3005	4.98	1.98
Red+2	24 Dec 2012	Slow	2x2	3904	4.96	0.93
Red+2	24 Dec 2012	Fast	2x2	3081	5.90	1.91
Red+2	30 Dec 2012	Slow	1x1	3834	3.13	0.94
Red+2	30 Dec 2012	Fast	1x1	3012	5.20	1.98
EEV10	15 Jul 2013	Slow	1x1	1656	4.68	1.32
EEV10	15 Jul 2013	Fast	1x1	965	8.00	2.64
Red+2	21 Nov 2013	Slow	1x1	3829	3.3	1.11
Red+2	21 Nov 2013	Fast	1x1	3036	5.15	2.36
EEV10	07 Jan 2014	Slow	1x1	1799	3.71	1.19
EEV10	07 Jan 2014	Fast	1x1	1365	5.16	2.52
EEV10	10 Jan 2014	Slow	1x1	1832	4.2	1.3
EEV10	10 Jan 2014	Fast	1x1	1350	6.04	2.64
EEV10	10 Jan 2014	Slow	2x2	2066	5.56	1.60
EEV10	10 Jan 2014	Fast	2x2	1636	6.14	2.61
Red+2	03 Feb 2014	Slow	1x1	3839	4.49	1.07
Red+2	03 Feb 2014	Fast	1x1	3040	6.41	2.28
Red+2	03 Feb 2014	slow	2x2	3931	3.98	1.05
Red+2	03 Feb 2014	Fast	2x2	3106	5.15	2.14
Red+2	13 May 2014	Slow	1x1	3844	3.99	1.14
Red+2	13 May 2014	Fast	1x1	3033	6.48	2.42
Red+2	13 May 2014	Slow	2x2	3945	3.58	1.18
Red+2	13 May 2014	Fast	2x2	3108	5.63	2.40
Red+2	17 July 2014	Slow	1x1	3859	3.30	1.60
Red+2	17 July 2014	Fast	1x1	3044	2.60	3.30
Red+2	20 Aug 2014	Slow	2x2	3950	3.10	1.50
Red+2	20 Aug 2014	Fast	2x2	3114	2.20	3.00
Red+2	20 Aug 2014	Slow	1x1	3862	3.30	1.50
Red+2	20 Aug 2014	Fast	1x1	3049	2.50	3.30
Red+2	06 Nov 2014	Slow	1x1	3867	3.33	1.03
Red+2	06 Nov 2014	Fast	1x1	3060	2.48	2.16
Red+2	01 Dec 2014	Slow	1x1	3865	3.43	1.27
Red+2	01 Dec 2014	Fast	1x1	3067	2.99	2.55
Red+2	29 Dec 2014	Slow	1x1	3872	3.68	1.15
Red+2	29 Dec 2014	Fast	1x1	3063	3.68	2.37
Red+2	04 Feb 2015	Slow	1x1	3869	3.12	0.94
Red+2	04 Feb 2015	Fast	1x1	3065	2.44	1.91
EEV10	02 Mar 2015	Slow	1x1	1859	3.07	1.19
EEV10	02 Mar 2015	Fast	1x1	1366	1.94	2.41
EEV10	02 Mar 2015	Slow	2x2	2102	3.35	3.78
EEV10	02 Mar 2015	Fast	2x2	1662	2.14	2.41
Red+2	10 Mar 2015	Slow	1x1	3871	3.49	1.23
Red+2	10 Mar 2015	Fast	1x1	3067	3.02	2.50
EEV10	11 May 2015	Slow	2x2	2123	4.39	8.25
EEV10	11 May 2015	Fast	2x2	1670	2.53	3.42
EEV10	11 May 2015	Slow	1x1	1887	3.64	1.64
EEV10	11 May 2015	Fast	1x1	1361	2.24	3.31
Red+2	10 May 2015	Slow	2x2	3940	3.61	1.45
Red+2	20 May 2015	Fast	2x2	3113		2.80
Red+2	20 May 2015	Slow	1x1	3876	3.54	0.96
Red+2	20 May 2015	Fast	1x1	3071	4.29	1.92
Red+2	20 Jul 2015	Slow	2x2	3950	2.76	1.59
Red+2	20 Jul 2015	Fast	2x2	3114	1.94	1.88
Red+2	20 Jul 2015	Slow	1x1	3875	2.89	0.96
Red+2	20 Jul 2015	Fast	1x1	3061	2.05	1.95
EEV10	07 Jun 2017	Slow	1x1	1997	3.05	1.34
EEV10	4 Sep 2017	Slow	2x1	2112	3.32	1.36
EEV10	4 Sep 2017	Fast	2x1	1631	2.53	2.72
Red+2	5 Sep 2017	Slow	1x1	3849	3.66	1.04
Red+2	5 Sep 2017	Fast	1x1	2996	2.62	2.13
Red+2	20 Sep 2017	Slow	2x2	3974	2.92	0.95
Red+2	20 Sep 2017	Fast	2x2	3100	1.99	1.96
Red+2	20 Sep 2017	Slow	1x1	3849	3.03	0.98
Red+2	20 Sep 2017	Fast	1x1	2999	2.13	2.09
Red+2	28 Nov 2017	Slow	2x2	3900	3.06	0.89
Red+2	28 Nov 2017	Fast	2x2	3094	2.19	1.74
Red+2	28 Nov 2017	Slow	1x1	3839	3.33	0.94
Red+2	28 Nov 2017	Fast	1x1	3006	2.45	1.90
Red+2	29 Nov 2017	Slow	1x1	3840	3.49	0.92
EEV10	12 Dec 2017	Slow	1x1	1985	3.07	1.40
EEV10	13 Jun 2018	Fast	1x1	1925	3.87	2.25
Red+2	20 Aug 2018	Slow	1x1	3848	3.15	1.1
Red+2	20 Aug 2018	Fast	1x1	2998	2.52	2.31
Red+2	20 Aug 2018	Slow	2x2	3976	2.97	1.1
Red+2	20 Aug 2018	Fast	2x2	3101	2.16	2.23
EEV10	24 Oct 2018	Slow	1x1	1991	3.03	1.71
EEV10	24 Oct 2018	Fast	1x1	1213	3.49	2.35
EEV10	25 Oct 2018	Slow	1x1	2006	3.37	1.71
EEV10	25 Oct 2018	Fast	1x1	1216	2.41	3.60
EEV10	26 Oct 2018	Slow	2x2	2213	3.26	1.55
EEV10	26 Oct 2018	Fast	2x2	1637	2.14	2.89
EEV10	26 Oct 2018	Slow	2x1	2111	3.18	1.41
EEV10	26 Oct 2018	Fast	2x1	1636	2.09	2.94
EEV10	26 Oct 2018	Slow	1x2	2005	3.02	1.44
EEV10	26 Oct 2018	Fast	1x2	2005	3.06	2.30
EEV10	28 Oct 2018	Slow	1x1	1992	3.01	2.19
EEV10	28 Oct 2018	Fast	1x1	1211	2.13	3.20
EEV10	30 Oct 2018	Slow	1x1	1999	3.39	1.38
EEV10	30 Oct 2018	Fast	1x1	1218	2.26	2.90
EEV10	30 Oct 2018	Slow	2x2	2116	3.22	1.34
EEV10	30 Oct 2018	Fast	2x2	1641	2.14	2.73
Red+2	14 Nov 2018	Slow	1x1	3828	3.22	0.94
Red+2	14 Nov 2018	Fast	1x1	2993	2.54	2.07
Red+2	25 Nov 2018	Slow	1x1	3834	3.41	0.93
Red+2	25 Nov 2018	Slow	2x2	3955	3.10	0.89
EEV10	26 Nov 2018	Slow	1x1	1987	3.05	1.37
EEV10	26 Nov 2018	Fast	1x1	1202	2.04	2.80
EEV10	26 Nov 2018	Slow	2x2	2102	3.23	3.19
EEV10	26 Nov 2018	Fast	2x2	1625	2.18	2.72
Red+2	14 Jan 2019	Slow	1x1	3816	3.24	0.96
Red+2	14 Jan 2019	Fast	1x1	2982	2.47	1.99
Red+2	14 Feb 2019	Slow	1x1	3815	3.23	0.93
Red+2	14 Feb 2019	Fast	1x1	2986	2.56	1.89
Red+2	14 Feb 2019	Slow	2x2	3940	3.05	0.90
Red+2	14 Feb 2019	Fast	2x2	3089	2.26	1.83
EEV10	21 Feb 2019	Slow	1x1	1941	2.98	1.33
EEV10	21 Feb 2019	Fast	1x1	1216	2.10	2.74
EEV10	22 Feb 2019	Slow	1x1	1993	3.34	1.36
EEV10	22 Feb 2019	Fast	1x1	1214	2.32	2.69
EEV10	22 Feb 2019	Slow	2x2	1629	2.32	2.69
EEV10	22 Feb 2019	Fast	2x2	2090	3.26	1.32
Red+2	28 March 2019	Slow	1x1	3814	3.28	0.78
Red+2	28 March 2019	Fast	1x1	2983	2.39	1.96
Red+2	28 March 2019	Slow	2x2	3942	3.24	3.02
Red+2	28 March 2019	Fast	2x2	3089	2.23
Red+2	28 March 2019	Slow	2x1	3938	2.99	0.94
Red+2	28 March 2019	Slow	1x2	3811	3.16	0.94
Red+2	22 April 2019	Slow	1x1	3814	3.18	0.94
Red+2	22 April 2019	Fast	1x1	2979	2.47	2.02
Red+2	22 April 2019	Slow	2x2	3947	3.12	0.91
Red+2	22 April 2019	Fast	2x2	3090	2.12	1.89
EEV10	2 Jul 2019	Slow	1x1	2001	3.10	1.35
EEV10	22 Jul 2019	Slow	1x1	1996	3.33	1.44
EEV10	22 Jul 2019	Fast	1x1	1182	2.16	2.95
EEV10	22 Jul 2019	Slow	2x2	2106	3.89	1.41
EEV10	22 Jul 2019	Fast	2x2	1629	2.37	2.89
EEV10	25 Sep 2019	Slow	1x1	1990	2.97	1.35
EEV10	25 Sep 2019	Fast	1x1	1194	2.01	2.75
EEV10	25 Sep 2019	Slow	2x2	2096	3.21	2.59
EEV10	25 Sep 2019	Fast	2x2	1628	2.04	2.69
EEV10	13 Nov 2019	Slow	1x1	1984	3.83	1.25
EEV10	13 Nov 2019	Fast	1x1	1194	5.36	2.66
EEV10	13 Nov 2019	Slow	2x2	2088	3.82	1.19
EEV10	13 Nov 2019	Fast	2x2	1623	5.21	2.47
EEV10	4 Mar 2020	Slow	1x1	1978	4.84	1.43
EEV10	4 Mar 2020	Fast	1x1	1182	6.48	2.94
EEV10	4 Mar 2020	Slow	2x2	2098	5.55	1.41
EEV10	4 Mar 2020	Fast	2x2	1618	6.77	2.85
EEV10	6 May 2020	Slow	1x1	-	4.08	1.27
EEV10	6 May 2020	Fast	1x1	-	6.01	2.66
EEV10	6 May 2020	Slow	2x2	-	4.41	1.23
EEV10	6 May 2020	Fast	2x2	-	5.58	2.46
Red+2	2 Jun 2020	Slow	1x1	-	3.12	0.93
Red+2	2 Jun 2020	Fast	1x1	-	5.01	2.04
Red+2	2 Jun 2020	Slow	2x2	-	3.29	0.90
Red+2	2 Jun 2020	Fast	2x2	-	4.30	1.87
EEV10	15 Jun 2020	Slow	1x1	-	3.97	1.24
EEV10	15 Jun 2020	Fast	1x1	-	5.43	2.60
EEV10	15 Jun 2020	Slow	2x2	-	4.36	1.20
EEV10	15 Jun 2020	Fast	2x2	-	5.46	2.47
Red+2	13 Jul 2020	Slow	1x1	3840	3.33	0.96
Red+2	13 Jul 2020	Fast	1x1	2987	2.52	2.04
Red+2	13 Jul 2020	Slow	2x2	3976	2.94	0.92
Red+2	13 Jul 2020	Fast	2x2	3098	2.20	1.90
Red+2	28 Sep 2020	Slow	1x1	3811	2.93	1.69
Red+2	28 Sep 2020	Fast	1x1	2964	2.21	2.27
Red+2	17 Mar 2021	Slow	1x1	3716	3.25	1.24
Red+2	17 Mar 2021	Fast	1x1	2996	2.52	2.52
Red+2	17 Mar 2021	Slow	2x2	3772	3.05	1.17
Red+2	17 Mar 2021	Fast	2x2	3036	2.41	2.39
Red+2	11 Apr 2021	Slow	1x1	3658	3.60	1.18
Red+2	11 Apr 2021	Fast	1x1	2930	2.65	1.95
Red+2	11 Apr 2021	Slow	2x2	3647	5.65	3.77
Red+2	11 Apr 2021	Fast	2x2	2941	2.71	3.19
EEV10	30 May 2021	Slow	1x1	2050	3.20	1.35
EEV10	30 May 2021	Fast	1x1	1444	2.25	2.85
EEV10	30 May 2021	Slow	2x2	2250	3.40	1.30
EEV10	30 May 2021	Fast	2x2	1873	2.30	2.70
EEV10	4 Aug 2021	Slow	1x1	2053	2.27	1.30
EEV10	4 Aug 2021	Fast	1x1	1414	2.19	5.72
EEV10	4 Aug 2021	Slow	2x2	2250	3.43	2.88
EEV10	4 Aug 2021	Fast	2x2	1861	2.27	5.83
Red+2	20 Sep 2021	Slow	1x1	3675	3.72	1.11
Red+2	20 Sep 2021	Fast	1x1	2938	5.79	2.25
Red+2	12 Jan 2022	Slow	1x1	3637	2.78	1.03
Red+2	10 Feb 2022	Fast	1x1	2911	2.05	2.12
Red+2	10 Feb 2022	Slow	1x1	3620	2.78	1.03
EEV10	24 Feb 2022	Slow	1x1	2004	4.16	1.22
EEV10	24 Feb 2022	Fast	1x1	1411	1.22	0.54
EEV10	5 April 2022	Slow	1x1	2023	4.42	1.16
EEV10	5 April 2022	Fast	1x1	1432	5.41	2.34
EEV10	6 April 2022	Fast	1x1	1423	2.14	2.70
EEV10	6 April 2022	Slow	1x1	2022	3.17	1.31
EEV10	6 April 2022	Fast	2x2	1851	2.22	2.79
EEV10	6 April 2022	Slow	2x2	2228	3.37	0.52
Red+2	11 April 2022	Fast	1x1	2948	2.14	2.82
Red+2	11 April 2022	Slow	1x1	3680	2.94	1.41
Red+2	11 April 2022	Fast	2x2	2957	2.08	0.04
Red+2	11 April 2022	Slow	2x2	3664	2.93	4.77
EEV10	4 July 2022	Slow	1x1	2017	3.16	1.21
Red+2	18 July 2022	Slow	1x1	3348	3.24	1.12
Red+2	18 July 2022	Fast	1x1	2997	2.39	2.38
Red+2	1 August 2022	Slow	1x1	3851	3.31	1.04
Red+2	1 August 2022	Fast	1x1	2998	2.54	0.20
EEV10	18 August 2022	Slow	1x1	2007	3.05	1.56
Red+2	7 September 2022	Slow	1x1	3838	3.43	1.01
Red+2	7 September 2022	Fast	1x1	2993	2.54	2.07
Red+2	10 Ocotober 2022	Slow	1x1	3839	3.36	1.01
Red+2	30 January 2023	Slow	1x1	3669	3.36	1.08
Red+2	30 January 2023	Fast	1x1	2962	2.54	2.20
EEV10	30 March 2023	Slow	1x1	1856	3.87	1.28
EEV10	30 March 2023	Fast	1x1	1389	2.33	-
EEV10	1 April 2023	Slow	1x1	1848	3.76	1.21
EEV10	1 April 2023	Fast	1x1	1396	5.33	2.51
EEV10	2 April 2023	Slow	1x1	1865	3.05	1.29
EEV10	2 April 2023	Slow	2x2	2166	3.34	1.27
Red+2	9 June 2023	Slow	1x1	4073	3.49	0.92
Red+2	9 June 2023	Fast	1x1	3132	2.82	1.93
EEV10	20 June 2023	Slow	1x1	2106	3.15	1.34
EEV10	20 June 2023	Slow	2x2	2302	3.49	1.32
Red+2	8 Sep 2023	Slow	1x1	3837	3.34	0.95
Red+2	8 Sep 2023	Fast	1x1	2991	2.37	2.03
Red+2	8 Sep 2023	Slow	2x2	3970	3.01	3.42
Red+2	8 Sep 2023	Fast	2x2	3101	2.37	2.28
EEV10	15 Oct 2023	Slow	1x1	1998	3.11	3.12
EEV10	15 Oct 2023	Fast	1x1	1658	2.09	6.01
EEV10	15 Oct 2023	Slow	2x2	2140	3.36	2.94
EEV10	15 Oct 2023	Fast	2x2	1190	2.02	6.62
CCD	Date	Read mode	Binning	Bias	Noise (ADU)	Gain (e-/ ADU)