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Time History Logging in Noise Monitoring

Sound Level Meter with Data Logging | Model 831C-LOG

The SoundAdvisor™ Model 831C integrating precision sound level meter can be used to record the evolution of sound pressure level over time as a time history (TH). The time history is then used to profile the observation period, which can vary from a couple of seconds to continuous monitoring

Larson Davis delivers on this need by enhancing the versatility of the SoundAdvisor Sound Level Meter Model 831C with the addition of Time History Logging Firmware (831C-LOG). Users can pre-select from logging periods as small as 2.5 ms to a full 24 hours. With time periods greater than or equal to 100 ms, up to 58 measurement parameters can be chosen. Selections consist of familiar acoustic metrics as well as non-acoustic metrics such as battery condition, outdoor microphone performance, and meteorological data (831C-WTHR).

Highlights

  • 2.5 ms to 24 hr sample period
  • Up to 58 user selectable parameters when sample period > 100 ms
  • Log power and weather data

Applications

  • View data trends over time
  • Correlate noise data with external events
  • Compute additional metrics
  • Engineering controls – Modify and Re-compute
  • Post-processed event detection
  • Archival record

Results and Data Reporting Simplified

LD 831C LOG G4 window software

Included G4 LD Utility software and LD Atlas mobile app both offer benefits including

  • Display time history data in tabular and graphical formats
  • Listen to sound recordings directly from the graphical display (with optional 831C-SR)
  • View heatmap of Octave Band data
  • Easily share pdf reports from a mobile device
831C-LOG Specifications
Time History Available Metrics

Time Interval

2.5 ms20 ms, 50 ms100 ms, 200 ms500 ms, 1s, 2s5 s - 24 hr
Lωeq xxxx
Lωpeak xxxx
LωSmax  xxx
LωFmax  xxx
LωImax  xxx
LωSmin  xxx
LωFmin  xxx
LωImin  xxx
LωSSPL xxxx
LωFSPL xxxx
LωISPL  xxx
LCeq-LAeq xxxx
LIeq-Leq xxxx
Time History Available Metrics with 831C-OB3
Time History Metric2.5 ms20 ms, 50 ms100 ms, 200 ms500 ms, 1s, 2s5 s - 24 hr
Leq 1/1x*xxxx
Leq 1/3x*xxxx
Lmax 1/1  xxx
Lmax 1/3 
xxx
Lmin 1/1 
xxx

* Only 1/1 Octave or 1/3 Octave can be chosen, not both

"ω" is the frequency weighting: A, C, or Z