GMOS-S Gain and Read Noise (Old)
You are here
Hamamatsu detectors (June 2014 - Aug 31 2015)
The table below gives gain/read-noise values for the GMOS Hamamatsu CCDs before the replacement of the video C-boards by the improved E-boards that fixed the banding problem. Note: GMOS South data obtained with E2V detectors (i.e. before June 2014) should use the older values (see bottom)
| SDSU Gain number |
Normal Science mode (2) |
Acquisition mode (6) |
Bright target mode (5) |
|||||
| CCD |
Sci Ext |
Amp. name | Gain | Noise | Gain | Noise | Gain | Noise |
| 1 | 1 | BI5-36-4k-2,4 | 1.626 | 4.03 | 1.41 | 6.12 | 5.10 | 7.76 |
| 1 | 2 | BI5-36-4k-2,3 | 1.700 | 4.25 | 1.45 | 6.54 | 5.36 | 8.18 |
| 1 | 3 | BI5-36-4k-2,2 | 1.720 | 3.98 | 1.48 | 6.01 | 5.34 | 7.93 |
| 1 | 4 | BI5-36-4k-2,1 | 1.652 | 4.24 | 1.43 | 6.66 | 5.20 | 8.68 |
| 2 | 5 | BI11-33-4k-1,4 | 1.739 | 3.80 | 1.51 | 5.24 | 5.48 | 7.75 |
| 2 | 6 | BI11-33-4k-1,3 | 1.673 | 3.98 | 1.46 | 5.48 | 5.27 | 7.79 |
| 2 | 7 | BI11-33-4k-1,2 | 1.691 | 3.83 | 1.45 | 4.90 | 5.36 | 7.65 |
| 2 | 8 | BI11-33-4k-1,1 | 1.664 | 4.12 | 1.44 | 4.86 | 5.14 | 7.53 |
| 3 | 9 | BI12-34-4k-1,4 | 1.613 | 3.51 | 1.39 | 4.97 | 5.13 | 7.32 |
| 3 | 10 | BI12-34-4k-1,3 | 1.510 | 3.25 | 1.30 | 5.07 | 4.74 | 7.11 |
| 3 | 11 | BI12-34-4k-1,2 | 1.510 | 3.35 | 1.31 | 5.07 | 4.72 | 6.85 |
| 3 | 12 | BI12-34-4k-1,1 | 1.519 | 3.45 | 1.31 | 5.69 | 4.83 | 7.48 |
| Ave | 1.64 | 3.82 | 1.41 | 5.55 | 5.14 | 7.67 | ||
E2V detectors (Sep 1 2006 - May 19 2014)
The table below gives gain/read-noise values for the 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 older values (see bottom)
| SDSU Gain number | 1 (High) |
2 (Low) |
5 (High) |
6 (Low) |
||||||
| CCD | Rate | Amp | 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
-----
Older values (before September 1, 2006)
The table below gives the gain/readnoise values for the GMOS EEV CCDs operating with the SDSU controller. These values should be used to reduce GMOS South data obtained before September 1, 2006. High and low gain settings for the best amplifiers (3-amp mode) are highlighted for both slow and fast readout modes.
| SDSU Gain number | 1 (High) |
2 (Low) |
5 (High) |
6 (Low) |
||||||
| CCD | Rate | Amp | Gain | Noise | Gain | Noise | Gain | Noise | Gain | Noise |
| 1 | F | L | 5.29 |
6.33 |
2.51 |
4.94 |
||||
| 1 | F | R | 5.27 |
6.28 |
2.47 |
4.81 |
||||
| 1 | S | L | 4.92 | 5.13 |
2.33 |
3.97 |
||||
| 1 | S | R | 4.98 |
5.48 |
2.46 |
4.28 |
||||
| 2 | F | L | 5.03 |
6.14 |
2.32 |
4.73 |
||||
| 2 | F | R | 5.03 | 8.41 |
2.38 |
5.25 |
||||
| 2 | S | L | 4.38 | 4.69 |
2.07 |
3.69 |
||||
| 2 | S | R | 4.65 |
5.46 |
2.13 |
3.93 |
||||
| 3 | F | L | 4.88 |
6.92 | 2.32 |
4.99 |
||||
| 3 | F | R | 4.90 | 6.20 |
2.28 |
4.58 |
||||
| 3 | S | L | 4.43 |
4.85 |
2.08 |
3.65 |
||||
| 3 | S | R | 4.36 |
4.45 |
2.07 |
3.31 |
||||
| Ave | F | 5.07 |
6.71 |
2.38 |
4.88 |
|||||
| Ave | S | 4.62 |
5.01 |
2.19 |
3.81 |
|||||
Rate: S=SLOW, F=Fast
Last update October 02 2015: German Gimeno
