ACU-RITE 300S READOUTS - Manual (Page 96)

82 II
II - 1 Installation Set
u
p 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) / 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) / 499.95) x 10
6
ppm = 100 ppm (rounded to
the nearest whole number).
8 Once determined, the encoder’s error information is entered
directly. Press the TYPE soft key to select LINEAR compensation.
8 Enter the compensation factor in parts per million (ppm), and press
the ENTER key.
Automatic Linear error compensation
The correction factor may be calculated automatically using a standard
gauge block. Press the AUTO CALC soft key. In the Standard Field,
enter the length of the standard plus any tool offset (tool, or edge
finder diameter), which is not required when measuring from the
same direction.
To measure the standard using an edge finder, touch one end of the
block. The Measured Field shows 0. Move to the second edge, and
touch the other end of the gauge block. The measured size, plus any
tool offset appears in the field.
To measure the standard using a tool, touch one end of the block, and
press TEACH. The Measured Field shows 0. Move to the second
edge, and touch the other end of the gauge block. Press TEACH. The
measured size, plus any tool offset appears in the field.
S measured length with reference standard
M measured length with device at axis