Overall Vibration (Low Frequency) Measurement With Severity Scale - Fluke 805 FC User Manual

805/805 FC
Users Manual
Overall Vibration (Low Frequency)
Measurement with Severity Scale
An overall vibration, or low frequency, measurement
includes a severity scale. The severity scale is an on-
screen tool that interprets the vibration wear as good,
satisfactory, unsatisfactory, or unacceptable. More
information about the severity scale is on page 31.
For this measurement, you must set the Meter to
recognize the type of machine, or Machine Category, for
the test. A list of the most common categories is
programmed into the Meter. When the Meter is set to a
category, it can adjust for the usual vibration levels of
different machine types. This gives you the best accuracy
in the severity scale.
After these parameters are set, the Meter shows the
overall vibration and bearing measurements with a severity
scale for each measurement. The overall vibration severity
scale uses a statistical analysis of data from thousands of
industrial machines. Keep in mind when you use the
severity scales:
20
•
The severity scales are only applicable to machines at
speeds from 600 RPM to 10,000 RPM.
Severity scales do not show if the RPM range is
<600 RPM.
•
Make measurements with the accelerometer as close
as possible to the bearing housing.
•
The severity scales are not applicable if the machine is
installed on spring or pad isolators.
•
Severity scales for motors match the machine that
they operate. For example, when you do a test on a
motor that operates a centrifugal pump, select the
applicable centrifugal pump Machine Category for all
test points on the motor and pump.
•
Gearbox severity scales are applicable only for single-
stage, rolling element bearing gearboxes.
Note