Sound level meter LD 831

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Model: LD 831
Manufacturer: Larson Davis
Status: Stocking
Guarantee: 12 months
Price: Contact

The fifth-generation advanced Larson Davis LD 831 Sound Level Meter, designed for simple one-handed operation, yet fully featured, intelligent and flexible with an ever-expanding firmware platform.

  • Class 1 sound measurement according to the latest international standards
  • Environmental noise assessment and monitoring
  • Measure reverberation time and build acoustics
  • Select HPD
  • On-site sound power measurement
  • Code execution

Description

I. Specifications of sound level meter LD 831

Sound level meter LD 831

About the LD 831 meter:

  • The LD831 Class 1 sound level meter, with its high definition display, is extremely versatile, performing the functions of several instruments.
  • It puts the combined features of an accurate Class 1 sound level meter, environmental noise analyzer, personal noise dosimeter and real-time frequency analyzer in the palm of your hand.
  • The Model 831 is the fifth generation Larson Davis sound level meter, designed for simple one-handed operation, yet full-featured, intelligent and flexible with an ever-expanding firmware platform.
  • The design of sound level meter LD 831 is based on countless real experiences from customers. It expands on Larson Davis’s tradition of delivering value, innovation, and functionality in a rugged, one-handed, extendable package and backed by a 2-year factory warranty, application support 24 hours and accredited factory service/calibration.

LD 831 LD 831 LD 831 LD 831 LD 831

Standard features of the LD 831 sound meter:

  • Compliant with IEC 61672-1: 2013, ANSI S1.4-2014 Class 1 sound level meter
  • Voice captions
  • EVERY LEVELS OF DISPLAY
  • User-programmed test mode
  • Six user-selectable statistics (Ln)
  • Community Noise Calculations (Lden, CNEL)
  • GPS support
  • Backspace function
  • Normalized spectrum
  • User-selectable screen layouts and lockable protection settings
  • Remote access and flexible upgradeability
  • Multiple non-proprietary power supply options including internal batteries –4XAA, AC, USB and external batteries.

LD 831 Sound level meter LD 831

Supported PC software:

  • G4 LD Utility – PC software supplied with the 831 meter supports full sound level meter control, optional upgrades and field firmware, data export to Excel® and includes an integrated “Screen Grabber” to display the SLM screen directly on the PC
  • DNA – analysis, post-processing and reporting tool for sound and vibration measurements. DNA offers advanced analysis, audio playback, and graphical reporting. Graphs can be annotated and shared between multiple users using DNA reading software.
  • Software Development Kit (SDK) – a toolkit for developing custom applications in MS Windows® or Linux for Model 831
  • 3rd Party – The 831 Sound Meter has been integrated into various 3rd party software packages including airport noise management software
  • Model 831 offers a complete solution for noise measurement. Whether in the office or in the field, the Model 831 can meet your acoustic measurement needs.

Sound level meter LD 831 Sound level meter LD 831

 

***Discover more sound level meters at: https://gmga.vn/en/danh-muc/measuring-device/sound-level-meter/

II. Specifications of Larson Davis LD831 sound level meter

GENERAL SPECIFICATIONS

Reference level

114.0 dB re. 20 μPa

Reference level range

Single large range for SLM Normal for OBA option, Gain 0 dB
Reference frequency

1000 Hz

Reference direction

0° is perpendicular to the microphone diaphragm
Temperature Effects

 ≤ ± 0.5 dB error between +14 to +122 °F (-10 to 50 °C)

Operating Temperature

 -13 °F  to +122 °F (-25 °C to +50 °C)
Storage temperature

-13 to +158 °F (-25 to +70 °C)

Humidity

≤ ± 0.5 dB error from 30% to 90% relative humidity  at 104 °F  (40 °C)
Equivalent Microphone Impedance

12 pF for Larson Davis 1/2 in microphone

Range Level Error (OBA option)

≤ ± 0.1 dB relative to the reference range
Digital Display Update Rate

Four times per second (0.25 sec between updates). 

First display indication is available 0.25 seconds  after initiation of a measurement.

Effect of an Extension Cable

None (up to 200 ft or 61 m with EXCxxx cable)

Electrostatic Discharges

The instrument is not adversely affected  by electrostatic discharges
Extended Weather Options

-40 to +158 ºF (-40 to +70 ºC) operation with CER-831-E

Resolution Specifications

Levels

0.1 dB

Dose

0.1%
Elapsed time

0.1 second

Real time clock

1 second
Calendar

Through 31 Dec 2100

Integration Time

Time Averaged Levels and Sound Exposure Levels (s)

Minimum

0.1 second
Maximum with Daily Autostore Enabled

Unlimited

Maximum with Daily Autostore Disabled

> 23 days with error < 0.5 dB

Dosimeter Metrics: TWA, Dose (s)

Minimum

0.1 second
Maximum

Unlimited

Ln Statistics

Number of selectable parameters

6 in xx.xx% format, visible on the Model 831

Storage of Complete Table

0.1 dB Steps
Spectral Statistics

Requires Octave Analysis option (831-OB3)

Markers

Number of Markers

10

Prenamed Markers

5: Truck, Automobile, Motorcycle, Aircraft, Exclude
Link Marker to Automatic Sound Recording

Yes, requires Sound Recording option (831-SR)

Back Erase

Back Ease Time

5 or 10 seconds

Supported Modes

Manual

Measurement Control Modes

Available Modes

Manual Stop, Timed Stop, Stop when Stable, Continuous, Single Block Timer, Daily Block Timer
Timed Stop

Time in hh:mm:ss

Stop When Stable

Delta level in xx.x dB and time in hh:mm:ss
Continuous with Daily Auto-Store

1, 2, 4, 6, 12, 24, 48, 96 or 144 files per day, automated file numbering “yymmddnn.LD0”

Continuous Restart on Power Failure

Automatic if powered by 12VDC
Single Block Timer

Start date and time to End data and time

Daily Block Timer

Up to 3 blocks with each start and end date, blocks can cross date line

Clock Stability

< 1 sec in 24 hours, at 75 ºF (+24 ºC)

< 10 sec in 30 days, at -40 to +158 ºF (-40 to +70 ºC)

Digital Voice Annotation

Annotate Recordings

Use headset (ACC003) or measurement microphone

Recording Sample Rate

8 ksps
Listening Options

On the Model 831 or using processing software for .wav files

 

III. Video

 

***See more product videos at: Gmga Measuring Youtube

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