ROTALIGN Ultra iS Shaft handbook
86
With ‘Detailed quality’ highlighted, press e to confirm selection. The “Measurement
quality” screen opens. The screen displays all the factors and the respective weighting
used to determine the measurement quality.
Measurement quality is based on the following measurement and environmental
criteria:
Rotation angle – the angle through which sensALIGN sensor/shaft is rotated
during measurement
Ellipse standard deviation – the root mean square deviation of the measurement
points on the calculated ellipse
Environmental vibration – the level of external vibration e.g. from neighbouring
running machine(s)
Rotation evenness – the smoothness of the measurement rotation e.g. if there is
any friction during the rotation that ‘jerks’ the shaft
Angle rotation inertia – abrupt changes in the measurement rotation speed e.g.
releasing and re-applying a break during the rotation
Rotation direction – change in the measurement rotational direction
Rotational speed – how fast sensALIGN sensor/shaft is rotated during
measurement
Filter output – the amount of measurement data filtered out
5.1.2 Multipoint measurement
This mode is used to measure shafts which are either difficult to turn continuously
or allow measurement only in certain rotational positions. The method can also
be used to measure uncoupled shafts, nonrotatable shafts, sleeve bearings, white
metal bearings and journal (radial) bearings, shafts that are difficult to turn, shafts
with herky-jerky rotation, situations with long spans or severe misalignment that will
readily cause the beam to fall out of range.
Measurement quality
is depicted using the
following colour codes:
— excellent
— acceptable
— not acceptable
— poor
In this example, when all
quality factors have been
considered, the resulting
measurement quality
of 75% is classified as
excellent with the colour
code blue.
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