TM 1-6625-724-13&P0009 000009 00-1TAKING A MEASUREMENTAVIATION VIBRATION ANALYZERFiguresFigure 1. Measure Sub-Menu Hierarchy .......................................................................................................................... 2TablesTable 1. Measurement Capabilities.................................................................................................................................. 5Table 2. Frequency Ranges Vs. Respective Measurement Resolutions......................................................................... 6a. MeasureThe measurement operation is started by pressing F1 at the Main Menu. A sub-menu, figure 1, will appearlisting all of the Test States that are associated with the particular aircraft selected earlier. These Test Statescontain all of the pre-stored setup information (such as the number of rotor revolutions that measurements areto be taken and averaged). This kind of information is directly linked from the Flight Plan chosen for thisaircraft.1. Selecting a Test StateFrom the list of Test States, a Test State can be selected by placing the highlight cursor over it using thearrow keys. The screen display output can be modified by using the four function keys. The currentdisplay state is set opposite to the function key label. To toggle between modes, press the desiredfunction key.(a) DISPLAY. The label DISPLAY above the F1 function key is an option that enables the display modefor measured Test States after data has been collected. Select this option by positioning the cursorover a Test State in the measurement menu that has already been measured, then press the F1function key to view the One Test State displays. (Displays here are the same ones that can beselected from the DISPLAYS section for One Test State.) Pressing the QUIT key will cause thedisplays to terminate and the main measurement screen to be re-displayed.(b) STROBE. The label STROBE above the F2 function key is an option that executes the strobingmeasurement mode for the selected Test State. Selection of a Test State is accomplished bypositioning the cursor over the desired Test State for tracking and pressing the DO key once. Whenverification of setup is completed, (*) appears adjacent to selected Test State, press the F2 functionkey to enter the strobed data. If more than one rotor or component can be strobed for the selectedTest State, then a menu will appear from which the user will need to choose the rotor or componentto strobe. Now, the user can strobe the blades and enter strobed based track data into the database.A Track Entry menu will appear allowing the blade values to be entered in inches. The LEFT/RIGHTarrow key is used to change values displayed over a decreasing/increasing value range. Pressingthe QUIT key will abort the strobe mode without causing the entered values to be added to thedatabase. Pressing the DO key, when finished, will add the entered values for track, for the selectedTest State, and cause the strobing to be discontinued. At this time, the main measurement screenwill be re-displayed.(c) SETUP. The label SETUP above the F3 function key is an option that allows the displaying of theaircraft setup configuration data. Select this option by pressing the F3 function key. A paged menudisplay will appear containing information for setting up the chosen Flight Plan, such asaccelerometer locations, blade ID, and any test installation information. Exit the display by pressingthe QUIT key, which will then bring back the main measurement menu.(d) LMT OFF. The label LMT OFF above the F4 function key indicates that limits checking is currentlydisabled during measurement mode. To enable limits checking during measurement, press the F4function key to toggle to the LMT ON label. This will cause limits checking to be done on collecteddata for a successfully measured Test State (only if safety checks have been established for the TestState in the aircraft setup file).
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