NOT CCD #7 test report.
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| Location | In ALFOSC, on telescope. |
| Light source | Blue  light in filter wheel. |
Summary of Results
| Bias level | 344 | ADU |
| Bias std. dev. | 5.26 | ADU |
| Conversion factor | 1.054 | electrons/ADU |
| Readout Noise | 5.54 | electrons/pixel |
| Nonlinearity | <0.3 | % |
| Shutter error | 0.030 | 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 | 2280.01 | 2282.06 | 2272.68 |
| 2.00000 | 2286.89 | 2287.51 | 2238.51 |
| 4.00000 | 4517.56 | 4518.50 | 4489.20 |
| 8.00000 | 9014.31 | 9012.65 | 8831.79 |
| 12.0000 | 13474.7 | 13479.3 | 13216.3 |
| 16.0000 | 17991.5 | 17989.2 | 17561.4 |
| 20.0000 | 22451.1 | 22457.5 | 21599.8 |
| 24.0000 | 26973.1 | 26971.5 | 26086.5 |
| 28.0000 | 31440.6 | 31447.5 | 30428.1 |
| 32.0000 | 35963.7 | 35963.6 | 34383.0 |
| 36.0000 | 40441.7 | 40450.2 | 38649.8 |
| 40.0000 | 44961.1 | 44960.7 | 43234.8 |
| 44.0000 | 49448.3 | 49455.5 | 47054.8 |
| 48.0000 | 53965.5 | 53965.1 | 51150.0 |
| 52.0000 | 58465.3 | 58468.9 | 55694.6 |
| This table as ASCII | |||
Plots
| Linearity | GIF | PostScript |
| 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 (2.2 MByte, gzipped).
A median stacked image of 19 short exposures (0.1 sec each) is available here (4.0 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 |