Model 831 FFT Option Fast Fourier Transform (FFT) with 831-FFT Firmware. Highlights I Hand-held, single-channel, FFT measurement Wide dynamic range Used for transient and continuous signals Real-time operation (no data loss) Frequency spans from 100 Hz to 20 kHz in 1-2-5 sequence Display zoom Max hold and average spectrum Utility software for archiving and viewing data Field upgradable – requires no other options FFT Analysis of Sound & Vibration Tone Detection Run-up, Run-down Machinery Troubleshooting Product Development Rumble and Rattle of HVAC Installations Road and Rail Traffic Signature Quality Control When you need more frequency resolution than 1/3rd octave band 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. The “Timed” mode repeats the count mode for a given period of time and accumulates the spectra in 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 SLM-Utility G3 Software (Supplied). Larson Davis

Max-T racking SLM-Utility G3 FFT Data Report 831-FFT with Model 831 complies with following standards IEC 61672-1:2002 Class 1 Electroacoustics - Sound level meters Fast Fourier Transform (FFT) Data management Storage of data on Model 831 - Number of Measurements Limited Only by Memory Export of Data to SLM Utility-G3, MS Excel, DNA and SDK Control of Model 831 for Run/Stop, Data Storage, Status, Clock Set and Firmware Upgrade Configuration Setup and Setup Manager for Different Instruments Download of Data Files for FFT, RT and SLM Mode View Data Plots for FFT Data in Overlay of Average and Maximum...