TM 1-6625-724-13&P0010 000010 00-7g.Using Spectral DisplaysThere are three basic types of spectral displays available on the AVA. These are:1. 400 Point Power Spectrum. The 400-point power spectrum displays vibration amplitude for theasynchronous or synchronous power spectrum modes, see figure 3. All 400 points are displayed on asingle screen. The cursor is controlled by the LEFT and RIGHT arrow keys on the keypad. The amplitudeand frequency at the cursor position are displayed in the upper right hand corner of the screen. Functionkey F1 allows the cursor to be toggled between one normal (NORMAL) cursor and harmonic (HARMON)cursors. Function key F2 selects a data table format where lines of peak-peak data are sorted by amplitudein descending order and function key F3 selects a data table format where lines of peak-peak data aresorted by frequency in increasing order, see figure 3. Function key F4 displays a menu that allowsselection of the number of values (5,10, 20, or 400) to be displayed in tables selected by function keys F2and F3.Figure 3. 400 Point Power Spectrum Display2. 128 Point Synchronous Spectrum Display. The synchronous power spectrum display, see figure 4, allowsthe display of 128 points of vibration data collected with the synchronous sampled time averaged mode.This display provides up to the 32nd harmonic vibration point with a resolution of 1/4 harmonic. The cursoris controlled by the LEFT and RIGHT arrow keys on the keypad. The amplitude, phase, and frequency ofthe data point at the cursor is displayed in the right side of the screen. Function key F1 allows a harmoniccursor to be displayed on the screen. Function key F2 allows the frequency axis units to be toggledbetween orders and frequency. Function key F3 selects a data table format as shown in the figure 4. Anyof the selected screens can be printed by pressing the PRINT key.Figure 4. 128 Point Synchronous Power Spectrum Display3. 6400 Point Zoom Display. The 6400-point Zoom display, figure 5, provides 6400 points of spectral datataken in the zoom measurement mode. This display type is applicable to the asynchronous or synchronousF1F2F3F4FLOWN 15:41:00 N 01 AUG 01FLOWN 15:41:00 N 01 AUG 01CURSOR 0.00ips 126.2 Hz
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