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 | 370 | ADU |
| Bias std. dev. | 5.285 | ADU |
| Conversion factor | 1.056 | electrons/ADU |
| Readout Noise | 5.58 | electrons/pixel |
| Nonlinearity | <0.5 | % |
| Shutter error | -0.01 | 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 | 2204.00 | 2208.49 | 2213.0 |
| 2.00000 | 2238.52 | 2238.51 | 2213.7 |
| 4.00000 | 4378.55 | 4385.99 | 4309.8 |
| 8.00000 | 8820.97 | 8820.57 | 8612.3 |
| 12.0000 | 13090.4 | 13107.9 | 12573. |
| 16.0000 | 17601.5 | 17601.9 | 17258. |
| 20.0000 | 21848.3 | 21870.1 | 21040. |
| 24.0000 | 26386.1 | 26387.2 | 25059. |
| 28.0000 | 30638.3 | 30662.9 | 29388. |
| 32.0000 | 35174.2 | 35177.7 | 33622. |
| 36.0000 | 39449.2 | 39471.5 | 37776. |
| 40.0000 | 43961.3 | 43968.6 | 42051. |
| 44.0000 | 48273.0 | 48294.5 | 45960. |
| 48.0000 | 52750.7 | 52764.8 | 50019. |
| 52.0000 | 57105.2 | 57125.1 | 54074. |
| 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 20 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 |