[Comm2011] Gain, linearity, readnoise etc. 2011-05-03

[helmich]

I volunteer John for that job!

Ewout

On Wed, 4 May 2011 02:27:45 +0200, Konrad Kuijken
<kuijken at strw.leidenuniv.nl> wrote:
> Hi guys,
> 
> now that the camera tilt appears to have been removed, it would be
> good to understand the image quality we have. Last night the seeing
> was very good, and I took some exposures (of one of the KiDS fields,
> ssssh) in ugri. Could you make the PSF quality plots for those?
> 
> Timestamps are 2011-05-03T07:06 to 08:41 inclusive.
> Cheers
> Koen
> 
> 
> On May 4, 2011, at 2:03, helmich wrote:
> 
>> Hi Gijs,
>>
>> Thanks for the plot. What we've been mostly looking at here are
>> readnoise, gain, linearity and readnoise in electrons (readnoise *
>> gain) plots. Olaf and Christoph have cycled through several detector
>> settings to try to bring the readnoise in electrons down to below 5
>> electrons, while keeping saturation at 65k and maintaining linearity.
>>
>> So readnoise in electrons (the correct readnoise and gain template
>> that belong together must be used) and the linearity plots are
>> probably the most telling, and we're most interested in confirmation
>> on those.
>>
>> One type of plot I've not had much success in making here is Quick
>> Check trend plots. Those are also very desirable to have.
>>
>> Regards,
>>
>> Ewout
>>
>>
>> On Wed, 04 May 2011 00:11:07 +0200, Gijs Verdoes Kleijn wrote:
>>
>> Hi Ewout,
>>
>> Please find attached the ReadNoise trend plot created in Groningen.
>>
>> Best wishes, Gijs
>>
>> Op 3-5-2011 17:02, helmich schreef:
>> Hi,
>>
>> Attached are plots for gain, linearity, readnoise and readnoise	 in
>> electrons for today.
>>
>> Regards,
>>
>> Ewout
>>
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