Fluke 810 User Manual page 135

FAQs - Diagnosis
1. How does the Tester diagnose the problems
and how accurate are the diagnoses?
Once the setup and measurement information is
collected, the onboard diagnostic system
analyzes the data using a set of powerful
algorithms. Using a database of similar
machines with no known faults, the diagnostic
system compares the tested machine's setup
and newly acquired vibration data to similar
machines in the database.
Diagnostic quality is largely based upon the
quality and quantity of the machine setup and
data provided to the Tester. Proper component
descriptions coupled with proper sensor
placement and orientation, accurate running
speed measurements and answering all optional
questions in the machine setup will contribute to
higher confidence in the final diagnosis. While
accuracy can be provided for the Tester's ability
to collect data (see Electrical Specifications),
many variables come into play to define a
reliable accuracy specification for the Tester's
diagnostic capability. However, in independent
testing, the diagnostic capability of the Tester is
similar to that of an experienced vibration
analyst.
Frequently Asked Questions
The diagnoses are based on experience with
similar machines. The Tester is part of an overall
decision-making process and should be used
alongside good judgment and knowledge of the
specific machine tested before taking specific
repair actions.
2. How should the severity scale be
interpreted? How long do I have before
failure?
The severity scale is based on the intensity of
the machine fault at the time of measurement. It
is not an indicator of time to machine failure. As
conditions change, the severity may change,
even appear to improve (for example,
immediately after lubrication). However, over
time, conditions will worsen with normal machine
wear and tear. Time to failure will vary
depending on the equipment type, age,
machine load, environmental conditions, and
other variables. It is not possible to correlate
each severity level with a certain time to failure.
Follow the recommended actions for each
severity level to avoid failure. In general, the
scale may be interpreted as follows:
A
FAQs - Diagnosis
A-7