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Measurement quality
Measurement quality is depicted using the following colour codes:
Blue – excellent; Green – acceptable; Yellow – not acceptable; Red – poor
Measurement quality is based on the following measurement and environmental criteria:
l Rotation angle – the angle through which the sensor and/or shaft is rotated during meas-
urement
l Ellipse standard deviation – the root mean square deviation of the measurement points
on the calculated ellipse
l Environmental vibration – the level of external vibration e.g. from neighbouring running
machine(s)
l Rotation evenness – the smoothness of the measurement rotation e.g. if there is any fric-
tion during the rotation that ‘jerks’ the shaft
l Angle rotation inertia – abrupt changes in the measurement rotation speed e.g. releas-
ing and re-applying a break during the rotation
l Rotation direction – change in the measurement rotational direction
l Rotational speed – how fast the sensor and/or shaft is rotated during measurement
l Filter output – the amount of measurement data filtered out
92 Version:2.3
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