Spectrum Analysis
Vibrex 2000 and Vibrex 2000 Plus User Guide 111
5.6.1.1 Ranging Feature
The user may use the ranging feature to provide a more detailed study of
vibration, by narrowing the range. Take the following characteristics into
account when using this feature:
• Select the range of interest (active orders) by pressing the
0-<24,000>RPM
(Vibrex 2000) or
0-<600,000>RPM
(Vibrex 2000 Plus) context key. Pressing the key repeatedly cycles
through the available frequency ranges.
• The Spectrum feature operates by listing the ten highest peaks in the
range of interest.
• The default range is 0 to 24,000 RPM for the Vibrex 2000 and 0 to
600,000 for the Vibrex 2000 Plus. If the user is using the Vibrex 2000
and encounter high peaks above 10,000 RPM, all the available peaks
may not show up.
• If the ranging is lowered to 0 to 12,000 RPM the peaks in the 12,000
to 20,000 RPM range become replaced by lower-level peaks in the
0 to 12,000 RPM range.
• The minimum IPS value that displays is 0.01 IPS.
5.6.1.2 Annotating Spectra
Annotate the spectrum by pressing the context key next to the
[ANNOTATE] notation or press
START and continue to the next screen,
then select the
ANNOTATE
context key. After the user finishes an
annotation, press
START.
5.6.2 Collecting Spectral Data
Collect spectral data, as follows:
1. Operate the aircraft or engine in the desired condition.
2. Press the
START key.
This action displays the Spectrum Data Acquisition screen, meaning
the Vibrex unit is collecting data.
NOTE: At any time during data collection, the user may press the
ABORT
context key to stop the operation.
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