Sound Level Meter Model 831 Larson Davis

Standard Features

IEC 61672-1:2013, ANSI S1.4, ANSI S1.43 Class 1 integrating sound level meter

Voice Annotation

ANY LEVEL Display

User programmable run modes

Six user selectable statistics ( Ln )

Threshold exceedance data

Community Noise Calculations ( Lden, CNEL )

GPS Global Positioning Support

Back Erase Functionality

Normalized Spectrum

User-selectable screen layout and lockable setup protection

Remote access and field upgradable

Wide variety of non-proprietary powering options including – 4XAA internal batteries, AC, USB and external batteries

Standards Met by Model 831

The Model 831 meets the specifications of the following standards :

Sound Level Meter Standards

IEC61672-1 Ed. 2.0 ( 2013-09 ) Class 1, Group X

IEC60651 Ed 1.2 ( 2001 ) plus Amendment 1 ( 1993-02 ) and Amendment 2 ( 2000-10 ) Type 1, Group X

IEC60804 ( 2000-10 ) Type 1, Group X

ANSI S1.4-2014 Type 1

Octave Filter Standards ( Option 831- OB3 )

IEC61260 Ed. 1.0 ( 1995-08 ) plus Amendment 1 ( 2001-09 ), 1/1 and 1/3 octave bands, Class 1, Group X, all filters

ANSI S1.11-2004 Class 1

Personal Noise Dosimeter Standards ( Option 831-IH )

IEC61252 Ed. 1.1 ( 2002-03 ) Type 1

ANSI S1.25-1991 Class 1

Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use

2006/95/EC Low Voltage Safety Directive

IEC 61010-1 Ed. 3.0 ( 2010-06 )

EMC Immunity and Emission

2004/08/EC EMC Directive

IEC 61326-1 Ed. 2.0 ( 2012-07 )

IEC 61672-1 Ed. 2.0 ( 2013-09 )

FCC Title 47 CRF Part 15, Class B

Model 831 General Features and Characteristics

Class 1 Precision Integrating Sound Level Meter with real-time 1/1 and 1/3 octave filters

Non-Volatile Memory

High contrast 1/8th VGA LCD display with white LED backlight; sunlight readable

Icon-driven graphic user interface

Soft rubber backlit keys

Large dynamic range

Time weightings : Slow, Fast, Impulse, Integration and Peak simultaneously ( AnyData )

Frequency weightings : A, C, Z simultaneously ( AnyData )

1/1 and 1/3 octave frequency analysis available

Voice message annotation and sound recording

Ln statistics ( L0.01 through L99.9 available )

SLM Utility-G3 software available for set-up, control and high speed data download with export to Excel®

Multi-tasking processor allows measuring while viewing data or transferring data

Data Secure feature saves data to permanent memory every minute

AC/DC outputs to recorder

Long battery life; > 16 hours continuous measurement

Multiple language support : English, German, Italian, Spanish, Portuguese, Swedish, French & Turkish

Field-upgradable firmware : keeps instrument current with the latest measurement features

Two-year limited warranty

Sound Level Meter Specifications

Averaging ( Integration method )

Linear or Exponential

RMS Time Weighting

Slow, Fast or Impulse

Frequency Weightings

A, C or Z

Peak Detector Frequency Weighting

A, C or Z

Gain

0 dB or +20 dB

Exchange Rates

3, 4, 5, or 6 dB with optional 831-IH

Sample Rate

51,200 Hz

Peak Rise Time

30 μμs

Physical Characteristics

Length with Microphone and Preamplifier

11.35 in

29.0 cm

Length, Instrument Body Only

8.8 in

22.4 cm

Width

2.8 in

7.1 cm

Depth

1.6 in

4.1 cm

Weight with Batteries, No Preamplifer or Microphone

13.6 oz

390 g

Weight with Batteries, Preamplifer and Microphone

1.2 lb

550 g

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

≤ ± 0.5 dB error between +14 to +122 °F ( -10 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 12 VDC

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