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5-8
Measurement tasks
Runup / Coastdown:
Overall value - RPM
selecting peak value
C. Supplementary information
C.1 'Overall Value - RPM' measurement type
This type of measurement records the progression of the
characteristic overall vibration values relative to the RPM. Points
of resonance are indicated by RPMs with increased vibration
amplitudes.
The Results screen displays the path of the RMS value in the upper
diagram; one of the three peak values (0-p, p-p, crest factor) can be
displayed in the lower diagram:
• To do this, press the F key and select the respective characteristic
value (see below).
C.2 'Spectrum - RPM' measurement type
This type of measurement records the spectra while the machine
RPM is changing. In this way, the progression of the RPM-
dependent vibration components in the spectrum can be tracked
and the points of resonance can be identified.
To start the measurement, the following condition must be fulfilled:
f
max.
The results screen always displays two consecutive spectra of the
recorded series (see below). Use the '+/-' key to scroll forwards and
backwards. The current number and the associated RPM for the
spectrum are displayed at the top left of the diagram. To scroll in
only one of the two diagrams, fix the display in the other diagram:
• Press the MENU key and click on 'Lock graph > lock lower / lock
upper'.
A better overview is provided by displaying the spectra in a
waterfall diagram (see also p. 4-13):
• Press the MENU button and click on 'Waterfall diagram'.
Spectrum - RPM
Individual display
> 4x n
(maximum rpm)
max.
Spectrum - RPM
Waterfall diagram
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