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COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

6.4.7.3 Alignment according to the linear Regression method
Measured line

Maximum error

Linear regression
Using the linear regression method, a straight line is calculated out of a number of measuring points
according to the smallest square method. The so calculated line is moved parallel to the highest and the
lowest point of the object. The vertical distance between the two lines is the maximum error calculated
according the linear regression method.

6.4.8 MEASURING DIRECTION AND SINGLE OR REFERENCE MEASUREMENT
Measurements conducted with the differential method allow the
compensation of slight changes of an object orientation during the
measurement and the compensation of low frequency vibrations.
These compensations are only satisfactory if the measuring object is
of rigid design and the supports are of the three-point type. Also the
surface on which the reference instrument is placed must be a solid
part of the object to be measured and of good flatness so that the re-
ference instrument is not wobbling. If these conditions are not fulfilled
the planned compensation cannot be achieved.
Flatness measurement with a
measuring and reference
Note: instrument
Long machine beds with several bearing points have a tendency to follow the shape of the foundation.
This will also give false compensation readings. Because of this, the reference instrument placed on the
machine bed will supply incorrect values. In these cases, applying the differential measuring method is not
recommended.
Reference
instrument
For a reference or difference measurement,
make sure that both devices are always orien-
ted in the same direction.
The measurement is always in the direction
of the cable connection. If this rule is not met,
the result may be mirror inverted. The whole
measurement is wrong and could lead to erro-
neous conclusions and decisions. Measuring direction

Measuring instrument
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