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Customizing the FFT Plot

Use the FFT Plot Settings dialog box to customize how FFT data is shown.

Schedule Settings dialog box

To access the FFT Plot Settings dialog box, tap on the FFT plot shown on the Data Files Display tab.

FFT Plot Settings
Channel NameDisplays the name of each channel added to the job.
Window TypeThe window type applied to channel data.
  • None: No window. Use when signal content contains random noise (white noise) or closely spaced sine waves.
  • Hann: Bell-shaped cosine window typically used to analyze continuous signals. Use when signal content contains sine waves, a combination of sine waves, vibration data consisting of narrowband random signals, or unknown content.
  • Hamming: Bell-shaped cosine window optimized to minimize the maximum (nearest) side lobe. Use when signal content consists of closely spaced sine waves.
  • Blackman-Harris: Similar to the Hann window, this window has a slightly wider main lobe but much better dynamic range. It is optimized to provide the minimum side lobe level.
  • Blackman: Similar to the Hann and Hamming windows, this window has slightly wider central lobes and less sideband leakage.
  • Flat top: Optimized for measuring peak amplitudes of discrete spectral components that are separated by several spectral lines. Use when signal content consists of sine waves and amplitude accuracy is important.
IntegrationThe integration type applied to acceleration sensor data. Applies only to acceleration data, and defaults to None for other sensor types.
  • None: No integration; acceleration data is represented as acceleration.
  • Single: Data is integrated once; acceleration data is represented as velocity. When custom units are defined, this value defaults to None.
  • Double: Data is integrated twice; acceleration data is represented as displacement.
Show PeakWhen enabled (default), the highest value of the plot displays with a circle at the peak. The circle does not display when this option is disabled.
Spectrum TypeThe spectrum type used to scale data.
  • Logarithmic: Measures the spectrum and plots the data as dB relative to full-scale.
  • Power: Measures the spectrum and plots the data in terms of power.
  • Amplitude Peak: Measures the spectrum and plots the data in terms of peak amplitude.
  • Amplitude RMS: Measures the spectrum and plots the data in terms of root-mean-square (RMS).
 The X- and Y-axes ranges update with the selected spectrum. User-entered range values can also be applied.

Tap Apply to update the FFT plot.