Sensor Alignment; Gain/Offset Control Dialog - Schäfter+Kirchhoff SK7500GTO-XL Instruction Manual

3 Camera Control and Performing a Scan

Sensor Alignment

If you are operating with a linear illumination source, check the alignment of the illumination source and the sensor
prior to a shading correction, as rotating the line sensor results in asymmetric vignetting.
Sensor and optics rotated in apposition

Gain/Offset Control Dialog

Cameras are shipped prealigned with gain/offset factory settings. Open the "Gain/Offset Control" dialog [Shift+F4]
to re-adjust or customize settings.
The gain/offset dialog contains up to 6 sliders for altering gain and offset. The number of active sliders depends on
the individual number of adjustable gain/offset channels of the camera.
The 'Camera Control' frame on the right is used for commands and advanced software functions. ( 4.1 Camera
Control by Commands, p. 20)
Adjustment principle
1. Offset
To adjust the zero baseline of the video signal, totally
block the incident light and enter "00" (volts) for channel 1.
For a two- or multi-channel sensor minimize any diffe-
rences between the channels by adjusting the other
Offset sliders.
A slight signal noise should be visible in the zero baseline.
1. Adjust channel 1 zero
level and minimize diffe-
rence between channels
using Offset slider
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Schäfter + Kirchhoff GmbH • Hamburg
Gain/Offset Control dialog
2. Adjust channel 1 gain
and minimize difference
between channels
using Gain slider
Offset and gain adjustment for more than one gain/offset channel
SK7500GTO-XL Instruction Manual (11.2015)
Sensor and optics aligned
2. Gain
Illuminate the sensor with a slight overexposure in order
to identify the maximum clipping. Use the Gain slider "1"
to adjust the maximum output voltage.
For a two- or multi-channel sensor minimize any diffe-
rences between the channels by adjusting the other Gain
sliders.
For the full 8-bit resolution of the camera, the maximum
output voltage is set to 255 and for 12-bit is set to 4095.
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