Troubleshooting
Vibrex 2000 and Vibrex 2000 Plus User Guide 155
6.4.2.2 No Vibration Reading
If the user has extreme difficulty in acquiring a vibration reading, do one
or more of the following actions:
• 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.
Bad cable Inspect the cable. Replace it if necessary.
Possible Strobex
failure
Refer to the Strobex Operation and
Maintenance Manual for additional
troubleshooting.
Possible Cause Corrective Action (Continued)
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