Gen II User Manual
8-15 – Tail Rotor Balance Chapter 8 Revision 3.00, April 2020
error indication associated with the averaged measurement. The numeric error value will
typically lower rapidly when the amplitude of vibration is high.
The top line of this screen can display three different status messages. The messages are:
“Waiting for Data” -This message is displayed until in-range RPM, IPS, and Phase Angle
readings are recorded by the analyzer. The only way to exit the screen while this message is
displayed is to use the [F0] “Back Up” key.
“Acquiring Data” -This message is displayed during data acquisition. As long as the data
remains in-range, the analyzer will add each new sample to the running average. The only
way to exit the screen while this message is displayed is to use the [F0] “Back Up” key.
“Data Quality: Fair” (highlighted yellow) -This message indicates that data is being
collected, but there are not enough samples yet to confirm good quality readings. You can
press [OK] to accept a reading at this point, but the quality of the measurement may be
reduced.
“Complete! Press OK” (highlighted green) -This message will appear when a minimum
number of consistent samples have been collected. Allow the unit to collect data as long as
the error continues to decrease. This will insure you have the most accurate data possible.
Use the [OK] key to exit this screen and store the reading.
The text below the “Current” heading indicates the RPM, IPS, and Clock Angle from the
latest collect vibration sample. These values will change as the individual readings are
collected. The RPM will be the currently recorded speed value. For Run 1 the “RPM”
heading itself will blink “HIGH” or “LOW” if the current RPM differs from the RPM
defined in the Tail Rotor Balance setup by more than 50%. For Run 2, the HIGH/LOW
warning will appear if the value is +/- 50 RPM from the value recorded during Run 1.
NOTE:
When the amplitude reaches a lower level (Approx. < 0.05 IPS) the numeric error may remain
high. This is a normal response and is not cause for alarm.
Pressing the [F1] “Reset” key will restart the data acquisition process. This may be
performed as a means of validating the quality of a measurement. If, after the “Reset”
key is pressed, the average measurement does not return to approximately the same
value shown before, the quality of the measurement may be questionable. If this
occurs, repeat the averaging process and try it again until the measurement values are
similar both before and after resetting.
Pressing the [F2] “Polar” key will display the data in a polar chart format.
When the error has reached its lowest point, press [OK] to stop acquisition and
continue the job.
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