Model 831

Class 1 Environmental Noise & Building Acoustics Analyzer

This versatile instrument, with high definition display, performs the functions of several instruments. It puts the combined features of a precision Class 1 sound level meter, environmental noise analyzer, personal noise dosimeter, and a real-time frequency analyzer in the palm of your hand.


  • Class 1 sound measurements to the latest international standards
  • Environmental noise assessment and monitoring
  • Reverberation time measurement and building acoustics
  • Tonality
  • Occupational noise evaluation
  • HPD selection
  • Noise reduction validation
  • Product quality control
  • NVH correlation
  • In-Situ sound power measurements
  • Real-time analysis of sound in 1/1 and 1/3-octave bands
  • Code enforcement

Standard Features

  • IEC 61672-1:2013, ANSI S1.4, ANSI S1.43 Class 1 integrating sound level meter
  • Voice Annotation
  • ANY LEVEL Display
  • User programmable run modes
  • Six user selectable statistics (Ln)
  • Threshold exceedance data
  • Community Noise Calculations (Lden, CNEL)
  • GPS Global Positioning Support
  • Back Erase Functionality
  • Normalized Spectrum
  • User-selectable screen layout and lockable setup protection
  • Remote access and field upgradable
  • Wide variety of non-proprietary powering options including – 4XAA internal batteries, AC, USB and external batteries