Printronix SL4M - Manual (Page 90)

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Chapter 4 SENSOR SETUP Menu
Use Label Length
Determines whether or not the Label Length value set in the MEDIA SETUP
menu is used during Run Auto-Cal.
• Disable (factory default). Run Auto-Cal relies exclusively in its ability to
detect varying transitions between labels and gaps, notches, holes, or
black marks while advancing media during the calibrate process to
determine Sensed Distance. The amount of media advanced is based on
the number of transitions detected.
NOTE: Although the “Use Label Length” keeps its value (enable/disable) at
all times, it will always be disabled when “Set Label Length” is set to
“Automatic”. The correct setting will take effect when “Set Label
Length” is set to manual. Based on the setting on the “Set Label
Length” menu in the Media Setup menu, the “Use Label Length”
menu will be ignored (disabled).
• Enable . The Label Length value set in the MEDIA SETUP menu is used
in the calibrate algorithm. This causes the Run Auto-Cal process to
advance media the minimum distance required to detect the true gap,
notch, hole, or black mark used for TOF (Top-of-Form) sensing. This
resolves problems where the sensor(s) may mistake high noise levels or
preprinted images within the label as the gap, notch, hole, or black mark
that could result in a sensed distance value much shorter than the actual
label length. Example: A 0.2 inch calibrated Sensed Distance with a 3.0
inch long label installed.
NOTE: Setting the Label Length value less than half the actual length of the
label in use will result in erroneous Sensed Distance values when
Run Auto-Cal is performed.
Threshold Range
This option allows the user to select the optimal threshold range for the label
stock in use. The printer defaults to using a threshold range of 50% of the
positive going pulse (see Media Profile) that represents each gap, notch or
mark detected after doing an Auto or Manual Calibrate. The printer then
detects anything within the label with that threshold range as TOF. While this
range is ideal for most medias, some labels with a preprinted image, liner gap
or inlay can confuse the media sensor(s) causing a false TOF detection. In
most cases this can be resolved by selecting a higher threshold range so the
printer will only trigger on the true TOF (gap, notch or mark) position.
The range is: 5% to 95% in 5% increments
The factory default is 50%.
NOTE: Set the label length value in the Media Setup menu to the actual
length of the installed labels. A new threshold range will not take
effect until an Auto or Manual Calibrate is successfully performed. A
Media Profile should be run after a Calibrate to visually verify that the
new range is the best possible selection.