© Brüel & Kjær Vibro
● C106834.002 / V06 ●
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Brüel & Kjær Vibro
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Instruction VC-1800 Series
Installation and Operation of VIBROCONTROL
18xx
EN
UNRESTRICTED DOCUMENT
Depending on the parameter setup, vertical markers indicate critical frequencies where rolling
element bearing problems are expected.
A number of small icons at the top of the window can be used for further processing of the graph:
Zoom, Zoom Reset, Pan, Print Graph, Export to CSV File in Microsoft Excel, Copy to Clipboard
and Copy to Microsoft Paint.
If the "Recommended Filter Band" is marked, a shaded area indicates the filter band recommended
by the ball bearing manufacturer, which covers all selected critical frequencies.
When leaving the "Bearing Frequency Calculator," the set parameters are saved with OK.
6.10 Crest Factor
The "Crest Factor" is the ratio of the peak value to the RMS value of the vibration signal.
To include the crest factor as part of the general vibration analysis, this function must be enabled
by marking: "Enabled." The crest factor of a signal is a unit-less entity.
The calculation of the crest factor is carried out within the bandwidth of the band-pass filter
selected in band 2. Please keep in mind that the crest factor function only makes sense for high
frequency analysis, i.e. with a band-pass bandwidth starting at 2 kHz.
A "transient filter" is used to remove unwanted non-periodical noise spikes in the vibration signal
that might otherwise corrupt the measuring result and cause false alarms.
For the crest factor the RMS detector is automatically selected and cannot be changed.