NOT CCD #7 test report.
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Location | In ALFOSC, on telescope. |
| Light source | Blue  light in filter wheel. |
Summary of Results
| Bias level | 390 | ADU |
| Bias std. dev. | 5.27 | ADU |
| Conversion factor | 1.062 | electrons/ADU |
| Readout Noise | 5.60 | electrons/pixel |
| Nonlinearity | <0.1 | % |
| Shutter error | 0.025 | sec |
Data
Window used: (896:1152,896:1152) (pixel, of full field, unbinned).
| Exposure time (s) | Mean Counts 1 (ADU) | Mean Counts 2 (ADU) | (Photon Noise)2 (ADU2) |
|---|---|---|---|
| 2.00000 | 2528.01 | 2528.12 | 2497.16 |
| 2.00000 | 2534.73 | 2534.96 | 2469.52 |
| 4.00000 | 5025.53 | 5026.69 | 4891.94 |
| 8.00000 | 10041.5 | 10041.7 | 9723.00 |
| 12.0000 | 15025.4 | 15029.0 | 14502.1 |
| 16.0000 | 20056.8 | 20058.6 | 19404.4 |
| 20.0000 | 25038.3 | 25042.8 | 23845.0 |
| 24.0000 | 30080.1 | 30080.7 | 29120.0 |
| 28.0000 | 35064.2 | 35066.6 | 33464.6 |
| 32.0000 | 40108.7 | 40109.8 | 38509.2 |
| 36.0000 | 45099.9 | 45104.5 | 42963.8 |
| 40.0000 | 50144.1 | 50147.5 | 47345.6 |
| 44.0000 | 55148.0 | 55151.6 | 52215.9 |
| 48.0000 | 60186.5 | 60189.6 | 56393.6 |
| 52.0000 | 64929.7 | 64930.8 | 22383.5 |
| This table as ASCII | |||
Plots
| Linearity as count rate | GIF | PostScript |
| Photon transfer curve | GIF | PostScript |
| BitStat | GIF | PostScript |
Images
A median stacked image of 21 bias frames is available here (2.7 MByte, gzipped).
A median stacked image of 20 short exposures (0.1 sec each) is available here (4 MByte, gzipped). This image may be useful for exploring the blemish structure of CCD#7. There are several traps and a couple of bad columns. The many spots with reduced sensitivity are artefacts of the thinning/coating process.
| Back to top | Last modified: May 31 2023 |