Custom Audio Electronics TK303 User Manual page 161

The following igure shows an example of paper with the non-thermal paper printed with black marks and other graphics
(for example, a barcode): the outgoing voltage is constant while passing the white paper between two notches, presents
a peak at each black mark and presents some "noise" at each barcode.
In this case, the optimal value for the "Notch/B.Mark Threshold" parameter is located about halfway between the peak value
and the maximum value of the "noise" (as shown in igure):
NON-THERMAL SIDE
Peak
THERMAL SIDE
"Notch/B.Mark
Threshold"
Noise
If the maximum value of "noise" read by the sensor is very close to the peak value, it might be dificult to place the value
of the "Notch/B.Mark Threshold" at an intermediate point. In these cases, it is mandatory that the portion of paper between
the point of printing end and the front notch is completely white (no graphics). In this way, the only next graphic detected
by the sensor for alignment after the printing end will be the notch.
161