304Alvium USB Cameras User Guide V4.6.1
Performance and troubleshooting
Measures for type 2 compensation
All other Alvium camera models support compensation type 2.
You can increase the margin size by using gain, with the following side effects:
• To give space to a larger margin, the effective pixel capacity decreases.
• White and light gray values are shifted down to gray.
Black level compensation for 1800 U-050m/c
Because the ON Semi PYTHON 480 sensor does not have a dark current
compensation, Alvium 1800 U-050m/c cameras have a typical black level value
drift, depending on exposure time and
DeviceTemperature (measured at the
mainboard). Table 155 shows the effect of the black level compensation. Should
additional compensation be needed, we recommend cooling the camera.
Temperature [°C]
ExposureTime [ms]
1 10 50 100 250 500 750 1,000
35
40
45
50
55
60
65
70
75
Full compensation
Partial compensation
Table 155: Exposure time and temperature affecting black level compensation
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