GRAPHTEC CUTTING PRO FC3100-60 Service Manual page 122

(6) Phase deviation (A bi-directionally printed radial pattern)
Using a loupe, measure the maximum difference between the widths of first-time lines and second-
time lines.
Assuming that a is the line width, b the maximum difference, and Z is the error:
0.13 mm ≥ Z = b - a
(7) Perpendicularly accuracy (at the cross mark)
Assuming that Z is the deviation:
0.3 mm ≥ Z
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FC3100-60 Service Manual
P/N53802-031T Rev. A