XN-8000 Frequently Asked Questions

The FFT analysis has a "max OA" function. The procedure is as follows. For instructions on how to create step 1, please refer to "Vibration Analysis Procedure".

■Operation

1. The confugu board analysis system is constructed as shown in Figure 1 (Figure 1).


Figure 1

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

   
   Figure 2

   • Insert three graphs—instantaneous time waveform and instantaneous power spectrum—into the measurement paper. Perform a preliminary measurement using the instantaneous value display, and adjust the X and Y axis scales for easier viewing.
   • Set one of the three power spectra to the MAX-OA power spectrum.

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

   Please note that MAX OA data will only be displayed after the "averaging measurement" process is completed.

   
   Figure 3

   
   Figure 4

   • Set one of the power spectra to MAX-OA bundled 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 bundled 1/3 octave data will be displayed after performing the (3) averaging measurement.

   
   Figure 5

3. Averaged measurement
   • Click the ▼ button next to Average to open the Averaging dialog box (Figure 6).
     Configure the settings as follows, and then click the OK button to confirm.

   ● Averaging mode	Power SP / Average
   ●Average time	Check the box 10s

   
   Figure 6

   • Click the [Average] button to turn it on.
   • Click the [Start] button to begin the measurement.
     The [Stop] button will automatically turn on after 10 seconds, stopping the measurement. The measurement results will be as shown in Figure 2 above. The "MAX-OA Power Spectrum" in Figure 2 displays the power spectrum when the overall value 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 1/3 octaves. Please note that to ensure accuracy when bundling to 1/3 octaves, the lower band will be cut off according to the frequency range.