Larson Davis 820 Sound Level Meter - Class 1 Precision Sound Level Meter Data Collector Handheld Instrument

Larson Davis 820 Sound Level Meter - The Larson Davis LD 820 handheld instrument has dual functionality: it is a Class 1 precision integrating sound level meter data collector and a high-performance sound level meter.

The instrument is suitable for sound level measurements and integrating sound level measurements, simultaneously performing true RMS value calculation and dual peak detection. The LD 820 offers slow, fast, and impulse detection, as well as A and C weighting (frequency filters). The instrument complies with the Class 1 integrating sound level meter specification of IEC and ANSI standards.

• Sound level measurement
• Community noise surveys
• Environmental noise monitoring
• Statistical analyses
• Traffic noise / pass-by noise measurement
• Industrial process noise assessment

• Class 1 precision integrating sound level meter
• Compliance (standards):
  • ANSI S1.4-1983 Type 1
  • ANSI S1.25-1991 Type 1
  • IEC 651 Type 1
  • IEC 804 Type 1
  • 86/188/EEC directive
  • IEC/TC-29 directive
• Dynamic range: 110 dB
• Long-term data collection capabilities: Interval Sound level trend Event history
• Memory: 256 kB
• Display: Leq, Lmax, Lmin, TWA, SEL noise, projected noise, Ln (1% ... 99%) Noise exposure (Pa²H) Histogram Sound level trend Prominent events, Ldn
• Operating modes: fast, slow, and impulse detection
• Evaluation: real-time true RMS value calculation and simultaneous dual peak detector
• Weighting: A and C weighting frequency filters
• Microphone pre-polarization: 0 V, 28 V, or 200 V (for condenser microphones)
• Output: AC/DC, configurable
• Interface: RS-232
• Remote control: via modem
• Power supply: 9 V battery (typical operating time: 20 hours) or optional external power supply (7 ... 16 V DC)
• Size/weight: 76 x 330 x 25 mm / 370 grams
• Temperature range: -10 ... 50°C