Larson Davis 831 Class 1 Sound Level Meter

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Larson Davis 831
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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. The Larson Davis Model 831 is a fifth generation Larson Davis sound level meter, designed for simple single handed operation, yet is fully featured, smart and versatile with an ever expanding firmware platform.
Larson Davis 831 Features
  • 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.
Larson Davis 831 Specs
Reference level 114.0 dB SPL
Reference level range Single large range for SLM Normal for OBA option
Reference frequency 1000 Hz
Reference direction 0° is perpendicular to the microphone diaphragm
Temperature ≤ ± 0.5 dB error between ≤ ± 0.5 dB error between -10° C and 50°C
Storage temperature -20°C to 70°C
Humidity ≤ ± 0.5 dB error from 30% and 90% relative humidity at 40°C
Equivalent microphone impedance 12 pF for Larson Davis 1/2" microphone
Range level error (OBA option) ≤ ± 0.1 dB relative to the reference range
Digital Display Update Rate Four times per second (0.25 sec between updates). First display indication is available 0.25 seconds after initiation of a measurement
Electrostatic Discharges The instrument is not adversely affected by electrostatic discharges
Extended weather options -40 °C to +70 °C operation with CER-831-E
Resolution Specifications
Levels 0.1 dB
Dose 0.1%
Elapsed time 0.1 second
Real time clock 1 second
Calendar 01 Jan 2008 - 31 Dec 2038
Integration Time
Time averaged Levels and Sound Exposure Levels (s)
Minimum 0.1 second
Maximum with daily autostore enabled Unlimited
Maximum with daily autostore disabled > 23 days with error > 0.5 dB
Dosimeter Metrics: TWA, Dose (s)
Minimum 0.1 second
Maximum Unlimited
Larson Davis 831 Standards
IEC 61672-1:2002
ANSI S1.43