Digital CCD Line Scan Camera SK 1024 XSD ( Rev.1.0. / 20.09.2005 ) - Manual Page
7
Gain and offset of the cameras of the XSD series can be
set either by trimmer or through software.
By default the trimmer are activated. Thus, a manual
gain / offset adjustment is possible.
To use the gain and offset adjustment through the
software, the gain / offset control has to be activated
with a command beforehand. After this, regarding the
gain / offset control, the camera responds to the
software commands only. In this control mode the
trimmer are bypassed. Only after deactivating the gain /
offset control via software the manual gain / offset
control using the trimmer is possible again.
8. Gain / Offset Settings
P1 P2
Camera backside
Manual gain / offset adjustment:
1. Shade the line scan sensor and balance the video
signal to zero voltage („00“ digital) using the P1
(offset) trimmer.
2. Illuminate the sensor to a slight overexposure to
identify the maximum clipping. Use the P2 (gain)
trimmer to adjuste the maximum output voltage.
The maximum output voltage is set to approx. 2.5
volts („FF“ digital) per default.
To adjust the gain-setting of
the pixel the camera does not
need to be opened. The
trimmers are accessible from
the outside.
Programming of gain / offset
The programming of gain and offset is by now only
possible by using the PC interface board SK9192D and
the software SkLineScan® by
Schäfter+Kirchhoff.
The basic sofware program SkLineScan® offers a
special dialog for the gain and offset setting of the XSD
cameras. Changes of these settings are prompt visible
in the oscilloscopical display of the line scan signal.
The programming of the XSD cameras provide an
internal camera number setting between 0 and 3 by
default.
Using “Camera Select” the desired camera is selected.
“Enable Control” transfers the gain / offset control to the
software. The gain / offset slides simplify the handling,
and the setting can be easily optimized.
Once the values for gain and offset are set they are
memorized in the system, even when it is switched off
or completely disconnected.
Deactivating “Enable Control” implicates reimplantation
of the gain / offset setting of the trimmer on the camera.
The software package SkLineScan® contains library
functions for gain and offset setting of the XSD
cameras.
Advantages of the gain / offset setting of the XSD cameras by software
- The gain / offset setting can be altered during the measurement, although the trimmer are not accessible.
- Adaption to changing illumination conditions without modifying the aperture of the lens.
- Control of the signal intensity with constant exposure time setting with the interface board.
- Matching of the signal intensities individually by operating several XSD cameras parallel with the Merger box
SK9194 or SK9195
The selection of the camera is accomplished by the programmed internal number 0...3, set before delivery.
void SK_X_CONTROL (ccd_arg, unsigned char camera, BOOL enable)
// Enables the software control of the XSD camera or the trimmer setting of the gain / offset control.
void SK_X_SETGAIN (ccd_arg, unsigned char camera, unsigned char gain)
// Setting of the camera gain
// Camera: internal number of the XSD camera, this is set by default to one of the numbers 0...3
// Gain: settin of the gain within a range of 0...127
void SK_X_SETOFFSET (ccd_arg, unsigned char camera, unsigned char offset)
// Setting of the camea offset
// Camera: internal number of the XSD camera, this is set by default to one of the numbers 0...3
// Offset: setting of the offset within a range of 0...63
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