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824 Overview
Operation Manual
 
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Larson Davis 824 Sound Level Meter Overview


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Key 824 Hardware Features Include:

  • 2MB internal memory allows for large data files
  • 105dB+ Dynamic Range (< 25 to > 140dBA in standard range)
  • Low system noise floor: < 16dBA typical in ISM mode (377B41 mic)
  • Easy, one-handed operation
  • 4 Hours of Operation using 3 AA Batteries
  • Works with any standard 200V or 0V condenser microphone: choice of microphone available
  • Microphone extension cabling supported to 150m/500ft
  • Backlit keypad
  • Backlit LCD display with full navigation, even while collecting data

Useability:

  • RMS, Peak A, C and Z Frequency Weighting
  • RMS Slow, Fast and Impulse Detection
  • Building Acoustics: RT60, NCB and RC calculations (*)
  • Multiple setup configurations can be stored on each meter
  • Outdoor kits and options available for unattended monitoring
  • 824 Util Software allows meter setup and data download
  • Real Time 1/1 & 1/3 Octave Frequency Analysis (*)
  • FFT real time analysis, to 400 lines (*)
  • Accelerometer connectivity & ICP® power for vibration measurements (*)
  • Audiometry firmware & additional audiometer test hardware available (*)

(*) Indicates an available option

Onboard Storage Capabilities Offer:

  • 2 million point single parameter Time History (e.g., LAeq at 1.0 dB resolution)
  • 1 million point single parameter Time History (e.g., LAeq at 0.1 dB resolution)
  • 70,000 RTA 1/1 octave spectra
  • 60,000 LOG intervals without Ln data
  • 35,000 LOG intervals with Ln data
  • 28,000 point 1/3 octave SSA Leq Time History or RTA 1/3 octave spectra
  • 20,000 intervals with 1/3 octave Leq spectrum
  • 12,300 SSA intervals with Leq and Max 1/3 octave spectra
  • 2,400 FFT 400-line snapshots

Standards Met:

ANSI ANSI S1.4 - 1985 - Type 1
ANSI S1.11-1985 - Type 1D
IEC IEC 61672-1 (2002) Class 1 - tested with 377B41
IEC 60804 (1985 & 1993) Type 1
IEC
 60651 (1993) Type 1
IEC 61260 (1994) Class 1