Viper 4040 User Manual
4 Propeller Balance – 4-5
4.1.1.1.5. Using the [⇓] key, move to the “Relative to” field. Select “Tape” or “Sensor”
using the [⇒] key. If using predetermined weight locations, select “Tape.” Decide
if you wish to measure weight placement phase angles relative to the reflective
tape or the vibration sensor as an index point.
4.1.1.1.6. Move to the “Holes:” filed and select either “Yes” or “No” using the [⇒] key. Yes
indicates that the propeller assembly has predetermined locations, or holes where
trim balance weights can be added. If you select “Yes” a page for defining the
location of each hole will be provided. You may also download setups with these
predefined locations from the ACES Systems web site and load the setups into
your analyzer. The “No” answer indicates that no predetermined locations are
available and that you will be drilling holes for the permanent mounting of the
final trim balance weights.
4.1.1.1.7. Move to the “Vib:” field and use the [⇒] key to choose the vibration engineering
units for this balance job. The choices are IPS (inches per second velocity),
mm/sec (millimeters per second velocity), cm/sec (centimeters per second
velocity), Mils (1000ths of an inch displacement), Microns, and Gs (equivalent
gravities).
4.1.1.1.8. The field to the immediate right of the Vib: filed is unmarked. It is a select field
also and is the modifiers to be used with the units of vibration (Vib:). The
selections are Peak, Pk-Pk (Peak-to-Peak, may also be called double amplitude),
Avg. (Average), and RMS (Route Mean Square).
4.1.1.1.9. Move to the “FSR” field and use the [⇒] key to select the Full Scale Range for
the vibration amplitude you reasonable expect to encounter on this job. For a
propeller balance conducted using IPS, a normal selection would be 1. You should
make your selection to accommodate the highest vibration as an overload of the
analyzer caused by higher values than that selected might delay or lengthen the
job.
4.1.1.1.10. Move down to the “Rotation (#1)” field using the [⇓] key. Using the [⇒] key,
Select CW (Clockwise) or CCW (Counter-Clockwise) for the rotation of the
propeller as viewed standing Forward of the propeller Looking Aft toward the tail
of the airplane (FLA).
4.1.1.1.11. Using the [⇓] key, move to the “Tach Type” field. Using the [⇒] key, select the
type of tachometer you are using.
Tach Type selections for this field include:
“Optical” - Includes the PhotoTach and LaseTach. This is the only selection that
will provide power to the Tach device.
“Mag (Lo)” - A magnetic interrupter with an output of 120mV or greater. This
selection is used for clean Tach signals with a low noise floor.
“Mag (Hi)” - A magnetic interrupter with an output of greater than 3 volts and less
than 5 volts. This selection provides isolation from erratic signals containing
electrical noise above 120 mV but less than 3 volts.
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