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Tests Descriptions

by Marco Bonati last modified 2005-10-19 02:14 PM

Description on test performed on the lab.

Photon Transfer (variance) curve:

* Exposures from 0 to ~18000 adus.
* Two images per exposure time, graph the noise of the diference of the images versus twice the mean value, compute the slope
* gain ~ 1.7 e-/adu

Linearity

* Exposures from 0 to ~25000 adus (same data as for variance)
* Graph mean versus exposure time, fit a line, and compute the non-linearity, in perentage (deviation from real line to fitted one, point by point)
* non-linearity typicaly less than 0.1% (measured up to 90% of ADC dinamic range)

Read Noise

* Compute the noise, in adus, of a bias frame and multiply by the gain ==> ~ 6.3 e-

Full well

* It was not possible to measure the real full well of the device, since the ADC is limiting the dynamic range as show in the full well picture.
Given the maximum ADC range (32768) adus, the operating dynamic range would be ~52000 e-

Dark Current
At 145K, it was no possible to make a reliable measurement of dark current, even with exposures of up to 6 hours long.