Custom Audio Electronics 915DW011000300, User Manual

Page: 79 / 84

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 black marks, presents
a peak at each black mark and presents some “noise” at each barcode.
In this case, the optimal value for the “Notch Threshold” parameter is located about halfway between the peak value and
the maximum value of the “noise”.
THERMAL SIDE
NON-THERMAL SIDE
Peak
“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 black mark 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 black mark.
79