Larson Davis 821 SoundExpert Sound Level Meter - Class 1 precision sound level meter and real-time noise analyzer for environmental noise protection

Larson Davis 821 SoundExpert Sound Level Meter - The LD 821 SoundExpert device has been specifically developed to meet the requirements of environmental noise level and traffic noise emission measurements. The instrument combines the capabilities of a sound level meter data collector and a real-time noise analyzer in a small-sized, robust, user-friendly handheld instrument. Its special features include sound recording, real-time 1/1 and 1/3 octave analysis, dosimeter recording function, and automatic Bluetooth-based data transfer.

The large-sized and high-resolution graphical touchscreen makes operating the device particularly convenient, while the Windows-based PC software assists with instrument setup and remote control (optional), as well as data download, analysis, and export to spreadsheet software.

• Environmental (e.g. traffic) noise emission measurement
• Urban noise level measurement, analysis
• Residential noise exposure measurements
• Event noise emission monitoring

• Class 1 precision integrating sound level meter and real-time noise analyzer with octave analysis
• Compliance (standards):
  • ANSI S1.4-2014
  • ANSI S1.25-1991
  • IEC 61672-1:2013
  • IEC 61252 (2017)
  • IEC 61010-1:2010
  • Directive 2014/35/EU
  • RoHS Directive 2011/65/EU
• Dynamic range: 14 ... 140 dB(A)
• Long-term data collection capabilities: Noise level trend and analysis Automatic data collection Dosimeter function
• Memory: 8 GB
• Measurements/display: Lmax, Lpeak(max) noise exposure, Leq equivalent noise exposure, Ln (6 values), LDN, LDEN
• Detection: fast, slow, impulse
• Real-time analysis (option): 1/1 octave, 1/3 octave
• Weighting: A, C, and Z frequency filter characteristics
• Class precision: 1 (Class 1)
• Automatic data transfer via Bluetooth interface
• Color graphical touchscreen with 480x800 pixels
• Power supply: built-in wireless rechargeable Li-Ion battery or USB charging (typical operating time: 40 hours)
• Size/weight: 260x83x32 mm / 383 grams
• Operating temperature range: -30 ... 60°C
• Windows software (option): configuration, remote control, data transfer