5-8
VIBXPERT 11.2010
Measurement tasks
F
C. Supplementary information
C.1 'Overall Value - RPM' measurement type
This type of measurement records the progression of the characteris-
tic 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.
> 4x n
max.
(maximum rpm)
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 'Fix Diagram > below (or
above)'.
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'.
Runup / Coastdown:
Overall value - RPM
selecting peak value
Spectrum - RPM
Individual display
Spectrum - RPM
Waterfall diagram
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