Page 67 - Lehrbuch Neigungsmessung deutsch 2018.indd

COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

6.4.2 COMMENTS ON STEP LENGTH AND OVERLAP OF MEASUREMENTS

2 measurement
nd
1 measurement 3 measurement The individual measurements must always be
rd
st
overlapping, i.e. the starting point of the new
measurement corresponds exactly to the endpoint
of the previous measurement (see picture left).
The measurement is always in the direction of
the connector on the instrument.
Step length

COMMENTS REGARDING DISPLAY ON MEASURING INSTRUMENT AND THE EFFECTIVE MEASUREMENT READING
Following the first measurement, the dis-
play on the instrument shows -4 μm/m. This
corresponds to a height difference of -4 μm
relative to a base length of 1000 mm.
Relative to a base length of 180 mm, the
height difference corresponds to -0.72 μm
only.
When measuring with a software, the va-
lue displayed is directly converted to the
step length and displayed.

POSSIBLE CAUSES OF MEASUREMENT ERRORS ARE:
• Temperature difference between the measuring base and the object to be measured
• Change in position of the object during the measurement, and/or vibrations
• Careless measurement
• Dirty surface of the object to be measured
• The display on the instrument is not stabilized before pressing the remote release
• No resp. insufficient overlap in measurement
• Warped or worn measuring base
• “Short wave“ hump-like surface defects, which can not properly be captured by the measuring
base provide no clear support (unstable measuring base means poor repetition)

If these criteria, or conditions are not met, this affects the measurement uncertainty. The more accurate
the measurement should be, the more time must be given to preparation and measurement.

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