Printronix t8000 Administrator's Manual page 89

Sensors > Calibrate > Gap Length
Gap Length is the actual length (height) of a label gap measured in .01 inch
increments.
Minimum 0.05 inches
Maximum 1.00 inches
Factory 0.12 inches
You must enter the correct Gap Length. If the Gap
WARNING
Length is too long, the image will shift down from
the leading edge (TOF) of the label.
Sensors > Calibrate > Minimum Delta
This menu changes the minimum threshold value the sensor(s) require to
detect the difference between the label and a gap, notch, hole or black mark.
This allows bolder gaps (such as notches or holes) to be used as the TOF
while intermediate gaps (liner) can be ignored. Increasing the value makes
the sensor(s) less sensitive to intermediate gaps and noise. Decreasing the
value makes the sensor(s) more sensitive for detecting gaps on low contrast
media, where there is very little difference between the label and the gap
(liner).
Minimum 048
Maximum 200
Gap/Mark Sensor = Disable, Gap, or Mark: 048
Factory
Otherwise: 080
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