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The parameter should be set equal to the distance between the surface of the
registration keystock (when the drum is at le_drum_pos) and the tripping point of the
table plate sensor. This value is used by the firmware when the plates main scan size
is measured during a load.
The plate size is calculated by seeing how far the drum moved before the table
plate sensor became uncovered, then adding this distance to the sensor_to_lec
parameter.
To calibrate the parameter simply get a decent sized plate (msz between 600mm and
1,100mm) and load it with the command "load <msz> cal" (Make sure that you accurately measure
the plate size, preferably down to 1mm). For more information on what this does,
see the "load" command.
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