Larson Davis LD 831C Sound Level Meter: Real-time Noise Analyzer and High-capacity Data Collector Combined

Its special features include: replayable audio and sound recording, multiple communication options (including GPRS), real-time 1/1 and 1/3 octave as well as spectrum analysis. In time-history recording mode, the instrument stores six parameters in each time interval, including: Lns, RTA Leq, RTA Max or RTA Min spectral data (ANY LEVEL^TM function). Optionally, weather parameters can also be measured and recorded with the LD 831C instrument.

Additional features to facilitate its use include: backlit color graphical display and keyboard, Windows-based PC software for instrument setup, data download, analysis, and export to spreadsheet software. Moreover, the LD Atlas^TM iOS^® and Android^TM application allows remote monitoring and configuration of the instrument from a smartphone or tablet PC.

• Environmental noise and noise exposure measurements
• Occupational noise level safety measurements
• Industrial and workplace noise level checks
• Acoustic assessment of indoor spaces
• Research and development measurements

• Class 1 precision integrating sound level meter and real-time noise analyzer with octave and spectrum analysis
• Compliance (standards):
  • IEC61672-1 Ed. 2.0 (2013) Class 1
  • IEC60651 Ed 1.2 (2001)
  • IEC60804 (2000-10) Type 1
  • ANSI S1.4-2014 Class 1
  • ANSI S1.43-1997 Type 1
  • IEC61260 Ed. 2.0 (2014) Class 1
  • ANSI S1.11-2014 Class 1
  • ISO/PAS 20065:2016
  • ISO 1996-2:2007 Annex C
  • ISO 1996-2:2017 (ISO/PAS 20065)
• Dynamic range: 120 dB
• Long-term data collection capabilities: Noise level trends and analysis Automatic data collection (2.5 ms ... 24 hours) 2-channel dosimeter function
• Memory: 2 GB (expandable via USB)
• Measurements/display: RMS and peak Ln (6 values) statistics and histogram Leq, Lmax, Lmin, Lpeak, LDN, LDEN, LCeq - LAeq
• Detection: fast, slow, impulse, and peak (simultaneous)
• Real-time filters: 1/1 octave (8 Hz ...16 kHz), 1/3 octave (6.3 Hz ... 20 kHz)
• Integration: linear or exponential (fast, slow, impulse)
• Weighting: A, C, and Z frequency filter characteristics
• Spectrum analysis up to 6400 lines, selectable frequency range and window function
• Reverberation time measurement
• Noise and sound recording playback and editing
• Output: AC/DC, customizable
• USB 2.0 peripheral connector
• Interface: USB, option: G4
• Remote control from PC, smartphone, or tablet PC
• Power supply: 4 x AA batteries or rechargeable batteries or optional external power supply (10 ... 15.5 V DC) or via USB connector (5 V +/- 5%)
• Size/weight: 71x290x41 mm / 490 grams
• Temperature range: -10 ... 50°C
• Windows software (G4), option: DNA, SDK
• iOS^® and Android^TM application (LD Atlas^TM)