When you need more frequency resolution than 1/3 octave spectral analysis can provide, Model 831 FFT Frequency Analysis is the ideal solution. The Fast Fourier Transform (FFT) algorithm is implemented in the Model 831 for precision spectral analysis of acoustic signals. By utilizing a variety of frequency span and resolution settings, FFT acquisition settings can be adjusted to tune into specific acoustic and vibration phenomena.
Model 831-FFT has 3 operational modes serving the different applications. “Count” mode accumulates the average spectrum and maximum for a fixed number of FFT spectra. “Timed” mode repeats the count mode for a given period of time and accumulates the spectra into a history. The “Timed” mode is best suited for transient signals while the “Manual” mode is typically used for steady state measurements. In “Manual” mode the number of averages is open and each Start-Stop sequence adds an entry to the history table.
Up to 6400 lines of resolution are available with Model 831-FFT allowing for detailed measurement analysis.
Users can field upgrade their Model 831 with FFT Analysis utilizing the supplied SLM-Utility G3 Software.