Chapter 6 – Maintenance
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First, try to acquire readings again. The Vibrex 2000 Plus
has a feature that tightens the tolerance automatically on
hard-to-acquire readings.
As a last resort, try acquiring just the IPS reading in a
spectrum. Most unstable vibration readings occur at low IPS
levels. Typically the propeller or rotor is already balanced,
but to document it the user may still use the IPS only. One
can always get a reading on the one-per- revolution in a
spectrum (order No. 1.0), as long as the Velocimeter is
working and the right channel is selected.
The user may employ the spectrum feature for RPM also.
Once the spectrum samples the photocell or magnetic
pickup, it is finished. There is very little averaging in the
spectrum, so the readings can tolerate some variations.
In these types of cases, we strongly recommend that the user
take several spectra and compare the RPM and IPS levels for
a better picture. One cannot get phase reference this way, but
a good reading on the vibration level is possible.
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