Larson Davis Model 824 Sound Level Meter and Real Time Analyser

The System 824 combines sound level meter and real-time analyzer capabilities in one small, rugged package. The instrument covers many important measuring functions in one user-friendly, hand-held design

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  • Aircraft Noise

  • Industrial Noise

  • General Surveys

  • Transportation Noise

  • Community Noise

  • Building Acoustics

  • Sound Power Determination

  • Vibration Measurements

  • Statistics

  • Transient Capture

  • Machinery Noise

  • Audiometric Calibration


824 Utility Software (.exe 2,995kB)

824 Brochure (.pdf 868kB)

824 Reference Manual (.pdf 3,217kB)

824 Training Manual (.pdf 552kB)


As functionality increases and size decreases, an advancement in user interface is required. The System 824 offers an uncomplicated user interface requiring a minimal number of key strokes to create a test setup tailored for an individual application. Pre-defined setups are built into the instrument but personalized setups are easily made via the icon-driven keypad or computer software.

With 1/1, 1/3 true digital octave analysis capabilities, or 400-line FFT, the System 824 is extremely flexible while designed for easy operation. The comfortable feel of the instrument with its light-weight design and rubberized grips makes using the System 824 even easier.


The System 824 features high speed data gathering and autostore for capturing transient events (RTA option). The time history record stores up to 38 different broadband and spectral parameters of your choice. For each interval period, the 824 stores six spectral Ln’s, RTA Leq, RTA Max or RTA Min (SSA). That's a lot of data!

Other easy-on-you features of the System 824 include a back-lit display and back-lit keys for use in low light conditions; intuitive Windows™ based software for ease of instrument measurement setup, download and viewing of measurement data, and integration with a favourite spreadsheet program. The System 824 can also print reports directly to a serial printer.






  • ANSI/IEC Type 1 Sound Level Meter

  • Multiple instrument functions: Simple SLM, combination SLM/RTA, logging SLM, high speed 1/3 octave real-time or FFT analyzer

  • Real-time filters: 1/1 Octave band (16hz to 16kHz), 1/3 Octave Band (12.5Hz to 20kHz), or 400-line FFT (1 Hz to 20 kHz)

  • Building Acoustics -RT60, NCB and RC calculations Microphone extendable up to 500' 2 megabytes of efficient data memory

  • Windows™ based software for setup, control and high speed data exchange

  • Light-weight, easy to hold, easy to use

  • Power source: Rechargeable NiMH Battery or 3 AA alkaline batteries

  • Direct print out of stored data

  • AC/DC output

  • RS-422 serial interface; serial bit rate up to 115 kbps


Head Office: PC Environmental Ltd, Units 1&2 Claylands Road. Ind.Est., Claylands Road, Bishops Waltham, Southampton SO32 1BH UK

Tel: +44 (0)1489 891853                                                  Fax: +44 (0)1489 895488                                          E-mail: