| 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 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 |
