XN-8000 Frequently Asked Questions

There is a 'max OA' function in FFT analysis. The procedure is as follows. Please refer to the 'vibration analysis procedure' for how to create operation 1.

Operation

1. The analysis system for the config board will be constructed as shown in Figure 1.


Figure 1

2. Insert the power spectrum graph into the measurement paper.
   Figure 2 below shows an example of four graphs: instantaneous time waveform, instantaneous power spectrum, MAX-OA power spectrum (x-axis Log scale), and the 1/3 octave bundled display of the MAX-OA power spectrum.

   
   Figure 2

   • Insert three graphs on the measurement paper: an instantaneous time waveform and an instantaneous power spectrum. Perform a preliminary measurement with the display of instantaneous values and set the scales of the X and Y axes for better visibility.
   • Set one of the three power spectra to the MAX-OA of the power spectrum.

     ●[Display Data] Page Waveform Type	MAX OA	Figure 3
     ●[Axis] Paper X-axis	Log	Figure 4

   Please note that the data for MAX OA will be displayed after the 'averaging measurement' is executed.

   
   Figure 3

   
   Figure 4

   • Set one of the power spectra to MAX-OA at 1/3 octave (Figure 5).

   Types of waveforms	Bundled octave 1/3 octave MAX OA
   Types of graphs	half bar graph

   Please note that the 1/3 octave band data will be displayed after performing the averaging measurement.

   
   Figure 5

3. Averaging measurement
   • Click the 【Average▽】 button to open the〔Averaging〕dialog (Figure 6).
     Set it as follows and click the OK button to confirm.

   Averaging Mode	Power SP / Cumulative Average
   Average time	Check 10s

   
   Figure 6

   • Click the [Average] button to turn it on.
   • Click the 【Start】 button to begin measurement.
     After 10 seconds, the 【Stop】 button will automatically turn on, stopping the measurement. The measurement results will appear as shown in Figure 2 above. The "MAX-OA Power Spectrum" in Figure 2 displays the power spectrum when the overall was at its maximum during the 10-second measurement period. The "MAX-OA 1/3oct bundled display" shows the MAX-OA power spectrum bundled into 1/3oct. Please note that when bundling into 1/3oct, the lower bands are cut according to the frequency range to ensure accuracy.