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The CCD currently in use with EFOSC2 at the
ESO 3.6m Telescope is a backside illuminated LORAL/LESSER
CCD #40
chip with 2048x2048 15 micron pixels and has no additional overscan in both X and Y directions.
The current CCD (ESO CCD#40) has been in use at the telescope with EFOSC2 since December 15th, 1997.
Note: The CCD controller (FIERA) was changed August 1th, 1998.
The below plot shows the variation of the bias level, standard light-source (note that often a beta-light is used which, due to radioactive decay, will fade), gain, read-out noise, shutter error, and linearity error as a function of time. The values for the bias, gain and read-out noise are plotted along with the associated measurement error. The blue dashed line in the plots shows the mean value of all the points, while the dotted blue line shows the standard deviation of this distribution. The blue and red points in the bottom plot show the maximum deviations in a positive and negative sense wrt the least-squares fit of the linearity data. Plotted vertically on the bottom of the graph is the date (dd/mm) on which the test was made.
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Last WebPage Update: Thu Oct 14 02:52:57 UTC 2004 |
For printing, the above plot is also available in postscript format . The raw data can also be viewed in a tabular format
Last Standard CCD Test results |
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*** MIDAS logfile (vers. 02SEPpl1.3) *** Tu, 09 Mar 2004 13:41:59 Page 1 *** MIDAS logfile (vers. 02SEPpl1.3) *** Tu, 09 Mar 2004 13:42:32 Page 2 ========================================================== SUMMARY STANDARD TEST CCD#40 TAKEN ON 040309 IN 10 MODE ========================================================== BIAS ==== 5 biases at start test: average = 217.16 stddev = 7.69 There were 0 hot pixels/columns detected TRANSFER FUNCTION AND LINEARITY DATA ==================================== Table : Std_10_40_040309 Sequence Exp_tim1 Med_cnt1 Med_cnt2 Variance Frc_cnt1 Frc_cnt2 el_adu1 -------- --------- --------- --------- --------- --------- --------- --------- 1 4.00 1480.8 1481.0 1159.8 0.13 0.12 1.28 2 8.00 2954.6 2955.7 2276.3 -0.13 -0.11 1.30 3 16.00 5907.4 5908.5 4552.2 -0.17 -0.16 1.30 4 24.00 8864.4 8863.9 6636.1 -0.14 -0.15 1.34 5 36.00 13301.9 13302.1 10302.8 -0.10 -0.10 1.29 6 48.00 17743.9 17744.3 13451.0 -0.06 -0.06 1.32 7 60.00 22192.0 22192.1 16830.0 -0.00 -0.01 1.32 8 80.00 29611.7 29612.1 22399.6 0.07 0.07 1.32 9 100.00 37051.2 37050.3 27674.6 0.17 0.16 1.34 10 120.00 44487.7 44488.8 33406.7 0.23 0.23 1.33 -------- --------- --------- --------- --------- --------- --------- --------- Dynamic range explored: from 1979 to 59442 e- Average count rate measured: 370 ADU/sec. CONV. FACTOR AND RON ==================== C.Fact = 1.34 +/- 0.01 e-/ADU RON = 10.28 +/- 0.04 e- RMS SHUTTER ERROR ============= Average shutter error derived from fractional count rate = 0.001 sec LINEARITY ERROR =============== Average linearity error after shutter correct. = + 0.23/-0.16 % These errors represent maximum deviation in % from the average count rate after correction for shutter delay |
In addition, the previous standard tests are available. Click in the table below to access these files.
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