NOT CCD #4 test report.
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| Location | In HiRAC, on telescope. |
| Light source | Blue  light in filter wheel. |
Summary of Results
| Bias level | 406 | ADU |
| Bias std. dev. | 5.50 | ADU |
| Conversion factor | 1.180 | electrons/ADU |
| Readout Noise | 6.50 | electrons/pixel |
| Nonlinearity | <0.2 | % |
| Shutter error | ~ 0.0 | 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) |
|---|---|---|---|
| 1.00000 | 3718.84 | 3720.50 | 3267.80 |
| 2.00000 | 7395.33 | 7400.51 | 6461.94 |
| 3.00000 | 11167.3 | 11166.3 | 9914.24 |
| 4.00000 | 14823.1 | 14832.4 | 12997.1 |
| 5.00000 | 18631.1 | 18631.3 | 16254.4 |
| 6.00000 | 22278.6 | 22290.9 | 19494.8 |
| 7.00000 | 26107.0 | 26108.6 | 22588.3 |
| 8.00000 | 29760.1 | 29772.1 | 25850.2 |
| 9.00000 | 33592.8 | 33592.3 | 28858.2 |
| 10.0000 | 37255.6 | 37268.1 | 32382.9 |
| 11.0000 | 41086.1 | 41090.2 | 35323.9 |
| 12.0000 | 44763.2 | 44776.6 | 38520.5 |
| 13.0000 | 48589.5 | 48591.7 | 41769.0 |
| 14.0000 | 52275.1 | 52288.0 | 44767.7 |
| 15.0000 | 56078.9 | 56083.3 | 47525.4 |
| 16.0000 | 59778.3 | 59790.1 | 50815.1 |
| 17.0000 | 63543.6 | 63547.2 | 49409.5 |
| 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 12 bias frames is available here (2.3 MByte, gzipped).
A median stacked image of 19 short exposures (0.1 sec each) is available here (4.1 MByte, gzipped). This image may be useful for exploring the blemish structure of CCD#4. The many spots and regions with reduced sensitivity are artefacts of the thinning/coating process. There is a great deal of structure in this CCD's flat field and it is possible that it was not properly oxygen soaked on the occasion of this test.
| Back to top | Last modified: May 31 2023 |