Sound level meter LD 831

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Model	LD 831
Manufacturer	Larson Davis
Power supply
Weight
Size
Condition	Còn hàng
Warranty	12 tháng

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Specifications
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I. Specifications of 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.

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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

***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).
Digital Display Update Rate	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