Fluke db PRUFTECHNIK SHAFTALIGN touch, Manual

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Measurement
Active Clock is the default measurement mode for horizontal machines, and Static Clock is the
default mode for vertical machines.
For horizontal machines, Static Clock measurement mode may be selected while in the meas-
urement screen.
Tap the measurement mode header [ 1 ] to access the measurement mode carousel.
Swipe the carousel up or down and select desired measurement mode.
In the above example, Active Clock measurement mode has been selected. The quality of the
measurement may be displayed either as a measurement standard deviation (SD) or meas-
urement quality factor.
Standard deviation(SD) is the root mean square deviation ( mean of the means) of the
measurement points. It describes how closely a group of data points are clustered around the
average of those data points. It is a measure of the measurement calibre. The smaller the SD,
the better the quality of the data collected.
Measurement quality is a factor defined by the following measurement and environmental
criteria: angular rotation, standard deviation of the measurement ellipse, vibration, rotation
evenness, angular rotation inertia, direction of rotation, speed and filter output. The higher the
factor, the better the quality of measurement.
The desired factor is set by tapping the corresponding item. The averaging is set by tapping
the 'Averaging' button.
Averaging
In certain industrial conditions, it may be necessary to increase the number of measurements
(recorded laser pulses) to be averaged when taking readings to attain the desired accuracy.
Particular cases include environments with increased machinery vibration. An increased aver-
56 Version:2.3
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