Vigilant User Manual
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Processing mode
Description
Waveform only
This type of
Processing mode
measures only a waveform. Sampling frequency
and acquisition time can be defined. This
Processing mode
type does not
calculate the spectrum, and no filtering can be applied to the waveform.
Indicators/parameters will be calculated from then.
Spectrum and
waveform
This type of
Processing mode
calculates both waveform and spectrum. It allows
defining the sampling frequency and the acquisition time of the waveform, and
all the different properties of the spectrum. It also allows applying filters.
Demodulation
This
Processing mode
acquires the waveform and the spectrum by using
the
demodulation
data processing technique. The demodulation is done by
using the peak-hold type enveloping.
Long waveform
This
Processing mode
enables the system to capture and store a long duration
waveform, up to 30 minutes. This
Processing
mode
is not measured however
on every monitoring period, but only when there is a storage strategy
configured to save it on the database.
Long waveforms
are useful, for example,
for
storing the full transient event of start-up or for monitoring slow-speed
machine.
Full spectrum
This
Processing mode
calculates the
Full spectrum
derived from waveforms of
two orthogonal probes. Also known as the spectrum of an orbit
Full spectrum
provides not only the frequency content of the vibration, but also the
precession direction at each frequency.
Order tracking
(optional features
under license)
This
Processing mode
applies the
Order tracking
technique to the data. This
technique transforms the original asynchronous sampled signal (with a
constant sample rate) into a tach-synchronous signal, with the same amount
of samples per cycle of shaft revolution. Waveforms measured with
Order
tracking
will have units of angle or cycles, instead of time, and their spectra
will be displayed in
Order
instead of frequency.
After selecting one specific mode, the interface will display the configuration page of the new
Processing mode
. This configuration page can also be displayed to be edited when clicking on any of
the
existing
Processing mode
of the list.
The following chapters describe the configuration options for each type of
Processing mode
(
waveform
only
,
Spectrum and waveform
,
Demodulation, Long waveform, Order tracking, etc.
).
