CCD-world: About EEV4220 and binning

[Bruce Atwood]

The following was posted to CCD-world:

Check for spurious charge in both the vertical and horizontal
registers.  You will find it to be sensitive to the clock high level.

"C.GUILLAUME" wrote:
> 
> The following was posted to CCD-world:
> 
> Hi all;
> 
> At OHP, we have reached the last phase of development of the new
> camera dedicated to our spectrometer "Aurelie" on the 1.52m telescope.
> That camera based on an EEV sensor, 4220 model, thinned, back-illuminated
> and non IMO type.
> We have reached a pretty good level of performances in full frame mode, or
> in windowing mode, using dump drain capability, but we observe a
> hard-to-understand
> phenomenon using binning mode.
> For example:
> Using binning mode on 100 lines (dark of 1s read by right output),
> we can see (on the resulting line) an increased level of about 25 e-, plus a
> level break
> on both right and left edges, (Cf  B100.ps or Page #1 in B100.pdf files)
> which length
> is a about 300 pix on both sides.
> 
> The files are available by FTP in 2 formats on the following machine:
> 
> Machine : st-iao.obs-hp.fr
> Login     : ccd
> Password : no password
> 
> Our trouble is due to the symetrical look of that feature.
> Could it be due to a side effect? ( Mechanical ? ??)
> In this case the normal mode (Cf B100b.ps or Page #2 of B100.pdf files)
> would be at
> a too low level to allow detection of that phenomenon?
> We think it cannot be due to dark level current since it has been measured
> at
> 0.5e-/hour/pix @ -110 Celsius.
> 
> We also observed that it seems proportionnal to the number of lines binned.
> 
> So, if somebody can explain us, it would be great...
> 
> Many thanks...
> 
>  -----------------------------
> ¦ Christian  GUILLAUME
> ¦ Michel GOILLANDEAU
> ¦ Service Electronique
> ¦   CNRS / IGRAP                                 Tel: (33).04.92.70.64.09
> ¦ Observatoire de Haute Provence         Fax: (33).04.92.70.64.64
> ¦ 04870 St Michel l'Observatoire        Email: guillaume at obs-hp.fr
>  ---------------------------------------------------------------------------
> ----
> - -- CCD-world -- --
> CCD-world is fully moderated. Send posts to CCD-world at astro.ku.dk
> Standard replies will go to the list; address personal replies manually.
> For more information, please go to:  http://www.not.iac.es/CCD-world/

-- 
Bruce Atwood
Director
Imaging Sciences Laboratory
Astronomy Department
The Ohio State University
174 W. 18th Ave.
Columbus, Ohio  43210-1106
(614) 292 6279 (V)
(614) 292 2928 (F)
- -- CCD-world -- --
CCD-world is fully moderated. Send posts to CCD-world at astro.ku.dk
Standard replies will go to the list; address personal replies manually.
For more information, please go to:  http://www.not.iac.es/CCD-world/