Gen II User Manual
24-3 – Reading Spectrum and Scales Chapter 24 Revision 2.10, Apr 2020
continue to decrease as the bars converge. Allow the unit to collect data as long as the error
continues to decrease. This will insure you have the most accurate data possible. Remember that
the percent error will be slower to reduce as the balance is improved.
24.2.2. –Numerical Values
The numerical values are divided into two parts, “Current” and “Average”.
The text below the “Current” heading indicates the most current RPM, IPS, and
Phase Angle from the latest collected vibration sample. These values will change
as the individual readings are collected.
The text below the “Average” heading indicates the running average of all RPM,
IPS, and Phase Angle data collected. These values may change early in the data
collection process but should stabilize before the “Data Quality Fair” message is
displayed.
o Also, under the “Average” heading is the “Error” value. This value is an
indication of the quality of the collected data to this point. When amplitudes are
high, this error will average down to, or near 0.00 very quickly. As the amplitude
is decreased due to the balancing process, the value will be slower to average
down toward 0.00. This is not a fault or defect in the analyzer, but only an
indication of the averaged data quality relative to the current vibration being
produced by the component.
24.2.3. –Available Function Keys
Use the [F1] “Reset” key if you believe the data has been corrupted due to wind gust, aircraft
movement or other external influences. This will clear the averaged data and begin a new
averaging. When satisfied that the data is acceptable, press [OK] to stop the data collection and
accept the averaging.
Use the “Polar” key to view the vibration readings in a polar chart. The key’s location will vary
depending on the job function being used. For more information, see Section 24.3 below.
Use the [F3] “+/- Pol.” key to reverse the polarity of the Tach Signal. If the Current RPM is
erratic at a stable engine speed, press this key in an attempt to stabilize the reading. This option
may be necessary when Mod Tth or Adj Tth are selected on some engines.
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