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Because of the structural design of profile projector, the over-hang problem of table is inevitable and the Abbe error is exist.
To achieve maximum possible accuracy for measurement, error compensation is commonly used. ES-9Q provides non-linear
error compensation to improve measurement accuracy to maximum possible limit .
Principle of operation :
Non linear error compensation make use of the REF (reference mark) position of linear scale to locate the absolute position
of the projector. The readout's CPU then compensate the readout readings according to the error table that built in during the
set up process. The compensation always started from the CP. START position and only compensate towards the positive
direction. In other words, it is vital to have the CP. START position located at the most negative position of projector travel.
RD-15Q offers a maximum of 303 non-linear compensation step, linear compensations is effect between the compensation
steps.
error curve
start position
error
( must be located
at the most
negative position
of the projector
travel )
Operation procedure
1) Locate the REF zero at ABS coordinate
Sdm 9
Sdm 9
Polar
XY
Q
ABS
Polar
XY
Q
Non-linear error compensation
2
5
1
3
4
CP.START
swap the readout display
to ABS coordinate
Store
Recall
R/D
Print
Enter
FI N I S H
Store
Recall
R/D
Print
Enter
FI N I S H
CP.PITCH
CP.STEP = 10
10
9
6
7
8
REF
- 33 -
CP.START: compensation
error curve
CP.PITCH:compensation
position
( + direction)
CP.STEP:compensation
ABS
Polar
Store
Recall
XY
Q
SEL MODE
Polar
Store
Recall
R/D
XY
Q
profile start
profile pitch
profile step
R/D
Print
Enter
FI N I S H
Print
Enter
FI N I S H
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