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Acquiring the Dark Signal
boreCONTROL
5.
Acquiring the Dark Signal
The dark signal of the sensor represents an intrinsic offset level generated by parasitic
reflections inside the controller, which must be taken into account for the controller to
be able to operate correctly. The level of the dark signal depends on the sampling rate.
The dark signal should be acquired at all sampling rates in order to be able to subtract
it while the controller is measuring. A dark signal acquisition is performed during adjust-
ment by the manufacturer, but must be repeated at regular intervals.
If you change the light intensity at the external light source or you change the sen-
sor, you have to repeat the dark signal measuring.
i
After each sensor change the dark signal has to be measured for the first time.
The dark signal compensation is described in the software manual.
