Advanced Gap Sensing - Printronix t8000 Administrator's Manual

Advanced Gap Sensing

This figure shows a Media Profile printout of a smart label where Sensors > Control > Gap/Mark Sensor
menu is set to Advanced Gap.
In this example, the gap threshold value the printer selected (represented by the Gap/Mark dotted line) is
too close to the baseline (die cut label). If there is an increase in noise or the opacity of the liner or ribbon,
the printer may falsely use the noise as the gap (top-of-form).
Media Sensor
Position
Paper Out (301)
Adv. Gap (120)
Indicates Type of Gap/Mark
Sensing Selected
To avoid this problem, increase the Threshold Range value to 60% of the maximum in the Sensors >
Control > Gap/Mark Thresh menu (the default is 50%), then run an Auto Calibrate again (Cross-ref to Auto
Calibrate).
NOTE:
Any changes to Threshold Range will not take effect until you run an Auto Calibrate again.
This will raise the Gap/Mark threshold high enough so that the printer will not falsely use the antenna or
noise as the gap (top-of-form).
1023
0767
0511
0255
0000
Baseline (die cut label)
Detected Amplitude
of the Antenna
Detected Amplitude
of the Gap
45