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Using a high magnification lens ( 50X or 100X) to locate the most negative position of the glass scale, positive the cross hair of
the screen to the first line of the glass scale, record down this position as the CP. START position.
3) Start measure the errors to build up an error curve
To make the error measurement more easy, swap to INC coordinate and zero at the CP. START position
ABS
Q
zero at the CP. START
position in INC coordinate
start measure the error by positioning
the cross hair of screen on the glass
scale. Take down the display value
shown at the readout and compare
it with the glass scale grating.
Non-linear error compensation
swap to INC coordinate
Polar
Store
Recall
R/D
Print
XY
Enter
FI N I S H
0.000
Q
Because the CP. START position
always in the most negative position
of the projector trave, therefore, it
should always be negative value
-90.565
record down this position by pen,
i.e., the CP.START= -90.565
INC
Polar
Store
Recall
R/D
Print
XY
Enter
FI N I S H
- 35 -
ABS
Polar
Store
Recall
R/D
Print
XY
Enter
FI N I S H
Q
INC
Polar
Store
Recall
R/D
Print
XY
Enter
FI N I S H
Q
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