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GMOS-S Gain and Read Noise Values

The table below gives gain/read-noise values for the current GMOS EEV CCDs measured in September 2006 after the replacement of the video boards installed in the SDSU controller. High and low gain settings for the best amplifiers (3-amp mode) are highlighted for both slow and fast readout modes. Note: GMOS South data obtained before September 1, 2006 should use the previous gain/read-noise values.

SDSU Gain number 1 (High)
2  (Low)
5 (High)
6 (Low)
CCDRateAmp Gain Noise Gain Noise Gain Noise Gain Noise
1 F L



5.054
6.84
2.408
4.49
1 F R



5.253 6.54
2.551 5.07
1 S L 4.954 5.70
2.372 3.98



1 S R 4.862
5.19
2.403 4.01




2 F L



5.051
7.35
2.295
4.42
2 F R



4.954 11.37
2.288
5.03
2 S L 4.532
4.81
2.076
3.85




2 S R 4.592
4.96
2.131
3.83




3 F L



4.868
8.56
2.264
4.63
3 F R



4.833 7.88
2.260
4.09
3 S L 4.381
4.81
2.056
3.27




3 S R 4.411
4.34
2.097
3.16




Ave F




5.002
8.09
2.344
4.622
Ave S
4.622
4.968
2.189
3.683




Rate: S=SLOW, F=Fast


Last update August 17 2007: Rodrigo Carrasco