Sound Level Meter
831 Model 831 sound level meter for Environmental / Community Noise including AnyData and Voice Annotation, without microphone or preamplifier.
831-FF Model 831 sound level meter with Class-1 free-field pre-polarized precision condenser microphone (50mV/Pa), preamplifier (PRM831), accessory kit (831-ACC) and LD G4 Utility software.
831-RI Model 831 sound level meter with Class-1 random-incidence pre-polarized condenser microphone (50mV/Pa), preamplifier (PRM831), accessory kit (831-ACC) and LD G4 Utility software.
Firmware Options
831-OB3 1/1 AND 1/3, Class 1, Octave Band Spectral Analysis
831-SR Sound recording to ".wav" format at 8, 16, 24 or 48kHz.
831-LOG Time history logging at periods from 20ms to 24hrs
831-FST Fast time history logging at 2.5, 5 or 10ms periods
831-ELA Automatic event detection and event history measurement history (1min to 99hr intervals) combine with 831-LOG for event time history and 831-SR for event sound recording.
831-RT Reverberation time measurement, computation and display.
831-FFT Fast Fourier Transform up to 6400 lines.
831-COMM Advanced digital communications via cellular modem.
831-MDM Analogue modem w/ RS232 connectivity.
831-WTHR Weather parameter logging in parallel with acoustic parameters.
831-IH Industrial Hygiene or personal noise dosimetry.
Handheld Accessories
WS001 3 1/2" diameter windscreen for 1/2" microphones.
831-ACC Accessory kit for Model 831 sound level meter, which includes case (831-CCS), battery (4-AA), power supply w/ USB cable (PSA029) and windscreen (WS001).
831-CCS Hard shell case for Model 831 Sound Level Meter
ADP074 ICP cable adapter for Model 831 sound level meter that provides 2 mA or 4 mA ICP® current depending upon instrument capability
CBL138 Cable, USB A to mini-B, 1 meter
CBL139 Cable 2.5mm AC/DC out to two RCA males, 6 ft. Includes two RCA female to BNC male adapters
PSA027 90 to 264V to 12V switching power supply for 824 and 831 sound level meter and HVM100. 2.5 x 5.5 x 10 mm connector
PSA029 AC Power supply for Model 831 and SoundTrack LxT (100-240VAC to 5V USB w/mini-B cable CBL138).
PSA031 12VDC to USB converter for SoundTrack LxT and Model 831
CBL140 DC power cable for Model 831 sound level meter, 8 – 30VDC includes lead-acid battery clamps and 12V car plug.
Microphones and Preamplifiers
PRM831 Model 831 sound level meter preamplifier for 1/2" free-field or random incidence prepolarized microphones.
377B02 1/2" free-field, prepolarized condenser microphone, typical sensitivity= 50 mV/Pa (±1.5 dB), 3.15 Hz to 20 kHz (±2 dB).
377C20 1/2" random Incidence, prepolarized condenser microphone 50 mV/Pa (±1.5 dB), 3.15 to 16 kHz (±2 dB).
377C10 1/4" pressure, prepolarized condenser microphone typical sensitivity= 1.0 mV/Pa (±3 dB), 4 Hz to 70 kHz (±2 dB).
ADP043 1/4 in microphone to 1/2 in preamplifier adapter.
PRM2103 Permanent outdoor preamplifier for Model 831 with remote calibration check, humidity reading and heater, for 377B02 pre-polarized microphone (not included). Requires CBL222.
Calibrators
CAL200 Class 1 acoustic calibrator with user selectable output of 94 or 114 dB at 1 kHz. 1/2 in. opening. (no adapter). Includes calibration certificate.
CAL250 Class 1 acoustic calibrator with 1 in opening and output of 114 dB re 20 uPa at 251.2 Hz. Includes ADP019 adapter for 1/2 in microphones and calibration certificate.
Noise Monitoring System Components
EPS2116 Environmental protection for 1/2 in preamplifiers (PRMLXT or PRM831), with windscreen, desiccant & bird spike. Mounting options for 1/4-20 thread (TRP001), 1.5 in. pipe (TRP003) and 3/4 in. NPT pipe included.
TRP001 Instrumentation tripod w/ADP032 preamp to tripod interface.
TRP003 Support tripod, maximum height 8ft, used in portable NMS systems.
SEN031 Combined weather sensor: wind speed and direction (no moving parts), temperature, humidity, pressure, rainfall (requires CBL167 cable + DVX008A).

Training Partner
Acoustar WHS Training logo
Downloads
831 User Manual
SoundAdvisor 831 Brochure
Outdoor Monitoring Brochure
Related Pages
Training Videos
Sound Meter Selection Guide
Outdoor Noise Monitor Kits
831 Ordering Information
Links
Larson Davis Page
G4 Ld Utility Software

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Handheld noise measurements
Workplace / indoor noise measurements
Room acoustics, reverberation time, FFT, etc.
Outdoor logging up to 1 week
Outdoor logging longer than 1 week
831-LOG: Time history with intervals from 20ms to 24hr
831-FST: Fast time history logging at 2.5, 5 or 10ms periods
831-OB3: Real-time 1/1 & 1/3 octave filter set
831-ELA: event, interval and daily histories logging
831-SR: Sound recording to ".wav" format at 8, 16, 24 or 48kHz.
831-RT: Reverberation time measurement, computation and display.
831-FFT: Fast Fourier Transform up to 6400 lines.
831-IH: Industrial Hygiene or personal noise dosimetry.
Camera-style tripod for attended noise measurements.
Accessory kit with hardcase, batteries, power supply, WiFi dongle, and windscreen.
Class 1 calibrator.
Basic outdoor weatherproof noise-logging kit.
Outdoor weatherproof noise-logging kit with self-calibrating microphone system, remote access via 4G modem, and indefinite operation with battery and solar panel.