Calibration
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Machine Element Lengths are Way Off After Calibration (cont.)
• Extension poles not used:
• Make sure that the elevation difference between the low & high laser pointer levels have been measured accurately AND entered into
the Control Box correctly. Make sure the length units are correct as well.
• Sensors:
• Check in the Sensor Check menu if a sensor angle value freezes from time to time.
• Magnetic target tube:
• Make sure the magnetic target tube got attached to the correct bucket pivot point.
• Definition:
• A variance of 10% or less of the calculated element lengths compared to the actual measurements is “a little bit off”.
• An inaccuracy of ± 0.4 inches (10 mm) of each element length is acceptable and won’t effect the system accuracy.
• If the machine has a 2
nd
boom:
• It’s important to change the angle between the main boom & 2
nd
boom significantly after each laser pointer shot without repetition of
certain angular orientations.
• Laser pointer:
• The unit’s laser dot should NOT blink during the calibration procedure.
• Check the unit’s calibration to make sure that the laser dot is really horizontal.
• Level the point laser very precisely using the bubble vial on the big silver adaptor or on the tripod.
• If there’s heavy wind that causes the laser dot to bounce up & down, especially at the 2
nd
level, try a setup without the tubes using the
metal frame inside the cab next to the door as your higher level setup. Use the magnetic L-Bar to attach the laser pointer.
Machine Element Lengths are a Little Bit Off After Calibration
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