Model 831 Manual Available Options 1-3
• Data files and Data Explorer
• Automatic data backup to prevent data loss on power
failure
• Overall measurement
• Community Noise Measurement
• Voice Annotation
•GPS Data
Available Options
The Model 831 is delivered with all firmware options
available at the time of manufacture already installed.
However, only those options which have been purchased
have been enabled. Any of the other firmware options can be
enabled at a later date, following purchase, using a file
delivered from Larson Davis via the Internet.
Purchase Required Options
• Real-time 1/1 & 1/3 Octave Frequency Analysis
(831-OB3)
• Measurement History for the manual or timed
storage of statistical data (831-ELA)
• Automatic Data Logging with periods from 20 ms to
24 hour (831-LOG)
• Fast Spectral Time History Data Logging with
intervals of 2.5, 5.0 or 10 ms (831-FST, requires 831-
LOG and 831-OB3)
• Exceedance-based Logging Analysis with Events
(831-ELA). Automatic sound recordings can also be
made when the 831-SR option is also enabled
• Industrial Hygiene Measurement (831-IH)
• Sound Recording (831-SR)
• Advanced IP Communication for Cellular
connectivity (831-COMM)
• RT60 (831-RT): Instrument mode for measuring
reverberation time
• FFT (831-FFT): FFT Instrument mode
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