Guppy PRO Technical Manual
V4.1.2
95
Manual gain
Guppy PRO models are equipped with a gain setting, allowing the gain to be
manually
adjusted on the fly by means of a simple command register write.
The following ranges can be used when manually setting the gain for the
analog video signal:
Brightness (black level or offset)
It is possible to set the black level in the camera within the following ranges:
0 to +16 gray values (@ 8 bit)
Increments are in
1/64 LSB (@ 8 bit)
The IIDC register brightness at offset 800h is used for this purpose.
The following table shows the BRIGHTNESS register.
Note
•
Values can only be changed within the limits of gain CSR.
•
Changes in auto exposure register only have an effect
when auto gain is active.
•
Auto exposure limits are 50 to 205. (
SmartView
Ctrl1
tab
:
Target gray level
)
Type
Range
Range in dB
Increment length
Guppy PRO CCD models
0 to 680
0 to 24.4 dB
~0.0359 dB/step
Guppy PRO F-503
(CMOS camera)
8 to 32
33 to 48
0 to 12.04 dB
12.57 to 18.06 dB
~0.125/step (1.02 - 0.28 dB/step)
~0.5/step (0.53 - 0.28 dB/step)
Table 48: Manual gain range for Guppy PRO models
Note
•
Setting the gain does not change the offset (black value)
•
A higher gain produces greater image noise. This reduces
image quality. For this reason, try first to increase the
brightness, using the aperture of the camera optics and/
or longer shutter settings.
Note
Setting the gain does not change the offset (black value).
