Accuracy Calibration
Purpose
The accuracy calibration (X:axis calibration) procedure is used to correct the end:point accuracy of the media axis. The carriage axis does not require calibration and is used to calibrate the media axis. The accuracy calibration also includes calibration of the optical line sensor on the carriage.
The accuracy calibration is also used to correct the error of the X:axis movement to avoid banding.
Perform the accuracy calibration whenever the:
EEROM is erased
Electronics module is replaced
Drive roller is removed or replaced
Media (X:axis) motor is removed or replaced
Drive:roller gear is removed or replaced
Cartridge carriage is replaced
Mark encoder is removed or replaced
Optical sensor is removed or replaced
What is the EndPoint Accuracy Specification ?
The end:point accuracy specifies how accurately a plotter can draw a given length of line. The end:point accuracy specification for the plotters is ± 0.38 mm (0.015 in) or ± 0.2% of the specified vector length, whichever is greater, at 23dC (73dF), at 50:60% relative humidity on HP special polyester film. Use the following formula to calculate the plotter's accuracy:
Measured length ± Desired length
Desired length
x 100 = %Error
What can Affect the EndPoint Accuracy ?
Various part tolerances inside the plotter affect the accuracy (in particular the drive roller). Other outside influences include:
Media thickness. Thicker media creates longer lines.
Media expansion. As the media grows, so do the lines.
The application software may be instructing the plotter to draw an incorrect line length.
The EEROM has been cleared. The accuracy constants are stored in this non:volatile memory component.
7:8 CalibrationsandAdjustments | C4699:90000 |