Previous CCD test data for 16-channel mode
- Report, 2002-05-17 (brief)
Full frame, unbinned, dual readout
In parenthesis, go to the note with the corresponding number.
| CCD (1) | 1a | 1b | 2a | 2b | 3a | 3b | 4a | 4b |
| FITS section | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Gain (e-/ADU) 22 Nov 2000 (2) |
2.5 | 2.8 | 2.5 | 2.2 | 2.4 | 2.4 | 2.4 | 2.3 |
| Gain (e-/ADU) 17 May 2002 (2) |
2.75 | 2.86 | 2.84 | 2.30 | 2.45 | 2.37 | 2.53 | 2.37 |
| Gain (e-/ADU) 08 May 2004 (6) |
2.73 | 2.91 | 2.83 | 2.27 | 2.86 | 2.52 | 2.42 | 2.36 |
| Gain (e-/ADU) Oct 2005 (2, 7) |
2.81 | 2.95 | 2.88 | 2.34 | 2.9 | 2.56 | 2.56 | 2.39 |
| Read noise (e-) 22 Nov 2000 |
5.9 | 7.2 | 6.5 | 5.0 | 8.6 | 11.5 | 8.1 | 6.8 |
| Read noise (e-) 17 May 2002 (3) |
5.97 | 9.4 | 7.0 | 5.06 | 7.1 | 10.0 | 8.3 | 6.2 |
| Read noise (e-) 08 May 2004 (6) |
5.79 | 5.63 | 6.17 | 4.68 | 8.78 | 8.10 | 5.78 | 4.99 |
| Read noise (e-) Oct 2005 (7) |
6.25 | 8.66 | 6.98 | 5.23 | 10.02 | 8.79 | 6.75 | 6.07 |
| Nonlinearities 17 May 2002 (4) |
~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<0.8% | ~<1% |
| Nonlinearities Oct 2005 (4) |
~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% |
| Spurious Charge (ADU) 17 May 2002 (5) |
N/M | ~10 | ~5 | ~8 | ~10 | ~12 | ~15 | ~8 |
| Full well (e-) 08 May 2004 (6) |
130,000 | 125,000 | 91,000 | 87,000 | 77,000 | 81,000 | 70,000 | 71,000 |
| Full well (e-) Oct 2005 (7) |
>112,000 | >118,000 | 86,000 | 89,000 | 87,000 | 97,000 | 67,000 | 67,000 |
| CCD (1) | 5b | 5a | 6b | 6a | 7b | 7a | 8b | 8a |
| FITS section | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Gain (e-/ADU) 22 Nov 2000 (2) |
2.0 | 1.8 | 2.1 | 2.0 | 2.5 | 2.6 | 3.3 | 3.3 |
| Gain (e-/ADU) 17 May 2002 (2) |
2.03 | 1.95 | 2.24 | 2.13 | 2.63 | 2.79 | 3.35 | 3.49 |
| Gain (e-/ADU) 08 May 2004 (6) |
2.01 | 1.93 | 2.25 | 2.13 | 2.17 | 2.38 | 2.69 | 2.60 |
| Gain (e-/ADU) Oct 2005 (2, 7) |
2.01 | 1.99 | 2.22 | 2.13 | 2.17 | 2.39 | 2.66 | 2.77 |
| Read noise (e-) 22 Nov 2000 |
7.6 | 7.0 | 8.3 | 7.2 | 5.0 | 5.6 | 7.7 | 7.6 |
| Read noise (e-) 17 May 2002 (3) |
7.1 | 6.8 | 14.6 | 8.1 | 6.05 | 8.1 | 8.7 | 8.7 |
| Read noise (e-) 08 May 2004 (6) |
5.23 | 5.49 | 5.85 | 5.73 | 4.35 | 5.17 | 5.90 | 6.08 |
| Read noise (e-) Oct 2005 (7) |
7.22 | 10.23 | 15.1 | 8.89 | 6.94 | 6.42 | 9.05 | 8.56 |
| Nonlinearities 17 May 2002 (4) |
~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% |
| Nonlinearities Oct 2005 (4) |
~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% | ~<1% |
| Spurious Charge (ADU) 17 May 2002 (5) |
~-5 | ~-5 | ~-5 | ~-5 | ~-2 | ~-2 | ~-5 | ~-5 |
| Full well (e-) 08 May 2004 (6) |
76,300 | 84,000 | 97,000 | 102,000 | 95,500 | 93,000 | 62,000 | 67,600 |
| Full well (e-) Oct 2005 (7) |
76,000 | 80,000 | 73,000 | 81,000 | 91,500 | 100,000 | 56,000 | 61,000 |
Notes:
- When looking at a Mosaic image, the 8 lower segments are denoted from left to right (ccd,amp) 1a,1b,2a,2b,3a,3b,4a,4b. Across the top, from left to right: 5b,5a,6b,6a,7b,7a,8b,8a.
- Gain measured from Transfer curve.
- Read noise calculated from standard deviation of a bias frame × gain.
- Nonlinearities are the width of the envelope of the count rate curve over a large part of the dynamic range of the detector. They include any variation in the light source and shutter effects, although the shutter delay has been removed to first order. These measurements are therefore an upper bound.
- Spurious charge is charge that is injected into the CCD as a result of parallel clocking. It shows up as a slope in the bias level in the vertical direction, quoted here in ADUs from the top to the bottom of the unbinned image.
- Measured in the La Serena lab after the installation of a new CCD #3. Full well was determined from the variance curve, noise from the overscan.
- Measured in situ at Blanco prime focus, using flat field lights.
Updated on June 5, 2021, 8:12 pm