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lorenzo_V
March 30, 2012, 14:19:36
Hi I have a question concerning gain settings in IC capture.
Is there a a general rule to know the value of the electronic gain (in dB) from the gain
parameter setted from Device properties in IC Capture?
Thanks
Lorenzo

Michael Kirmse
March 30, 2012, 17:36:58
Hello lorenzo_V,

the ratio of the shown gain value to the electronic gain value in dB varies with the type of camera. What cameras do you use?

Stefan Geissler
March 30, 2012, 17:42:14
Lorenzo,

most of our CCD cameras have the gain starting at 0 ending a 36 db. The gain rises linear with the value set.

lorenzo_V
April 2, 2012, 09:20:20
Michael,
I use a DMK21BF04 electronic gain (0-36 dB) gain value 260-1023.
So if the relation is linear between the dB and the gain value I've to multiply the value for the ratio 36/764 to obtain the gain in dB.
Is it correct?
Best regards
Lorenzo

Stefan Geissler
April 2, 2012, 09:55:24
Yes, I think so. Please see the attached image

http://www.theimagingsourceforums.com/attachment.php?attachmentid=1473&d=1333354214

lorenzo_V
April 2, 2012, 14:18:12
Stefan,
I'm a little bit confused having a look at the graph. I think that @ 0 dB the abscissa (register value) has to be 260, doesn't it?
Best regards
Lorenzo

Stefan Geissler
April 2, 2012, 17:14:54
Lorenzo,

what you see is an excerpt of the documentation of the camera engineers. A little gain must be a minimum setting, which is 260, in order to see an image at all. Therefore, the minimum value is 260, which seems to be 8db in the camera electronics.