200S 49
II - 1 Installation Setup
Linear Error Compensation
Linear error compensation can be applied, if the results of the
comparison with a reference standard show a linear deviation over the
whole measuring length. In this case the error can be compensated
by the calculation of a single correction factor.
To calculate the linear error compensation use this formula:
Correction factor LEC = (S – M) x 10
6
ppm with:
Example:
If the length of the standard you used is 500 mm, and the measured
length along the X-axis is 499.95, then the LEC for the X-axis is
100 parts per million (ppm).
LEC = (500 – 499.95) x 10
6
ppm = 100 ppm (rounded to the nearest
whole number).
Once determined, the encoder’s error information is entered
directly. Press the TYPE soft key to select LINEAR compensation.
Enter the compensation factor in parts per million (ppm), and press
the ENTER key.
Non-Linear Error Compensation
Non-linear error compensation should be applied if the results of the
comparison with a reference standard show an alternating, or
oscillating deviation. The required correction values are calculated,
and entered in a table. The 200S supports up to 200 points per axis.
The error value between two entered adjacent correction points is
calculated with linear interpolation.
S measured length with reference standard
M measured length with device at axis
Non-linear error compensation is only available on scales
with reference marks. If non-linear error compensation
has been defined, no error compensation will be applied
until the reference marks have been crossed.
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General