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Sound Level Meter Model 831 Larson Davis |
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Sound Level Meter Specifications |
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Averaging ( Integration method ) |
Linear or Exponential |
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RMS Time Weighting |
Slow, Fast or Impulse |
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Frequency Weightings |
A, C or Z |
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Peak Detector Frequency Weighting |
A, C or Z |
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Gain |
0 dB or +20 dB |
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Exchange Rates |
3, 4, 5, or 6 dB with optional 831-IH |
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Sample Rate |
51,200 Hz |
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Peak Rise Time |
30 μμs |
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Physical Characteristics |
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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 |
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Reference level |
114.0 dB re. 20 μPa |
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Reference level range |
Single large range for SLM Normal for OBA option, Gain 0 dB |
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Reference frequency |
1000 Hz |
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Reference direction |
0° is perpendicular to the microphone diaphragm |
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Temperature |
≤ ± 0.5 dB error between +14 to +122 °F ( -10 to 50 °C ) |
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Storage temperature |
-13 to +158 °F ( -25 to +70 °C ) |
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Humidity |
≤ ± 0.5 dB error from 30% to 90% relative humidity at 104°F (40 °C) |
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Equivalent Microphone Impedance |
12 pF for Larson Davis 1/2 in microphone |
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Range Level Error ( OBA option ) |
≤ ± 0.1 dB relative to the reference range |
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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. |
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Effect of an Extension Cable |
None ( up to 200 ft or 61 m with EXCxxx cable ) |
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Electrostatic Discharges |
The instrument is not adversely affected by electrostatic discharges |
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Extended Weather Options |
-40 to +158 ºF ( -40 to +70 ºC ) operation with CER-831-E |
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Resolution Specifications |
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Levels |
0.1 dB |
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Dose |
0.1 % |
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Elapsed time |
0.1 second |
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Real time clock |
1 second |
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Calendar Through |
31 Dec 2100 |
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Integration Time |
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Time Averaged Levels and Sound Exposure Levels ( s ) |
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Minimum |
0.1 second |
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Maximum with Daily Autostore Enabled |
Unlimited |
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Maximum with Daily Autostore Disabled |
> 23 days with error < 0.5 dB |
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Dosimeter Metrics : TWA, Dose ( s ) |
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Minimum |
0.1 second |
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Maximum |
Unlimited |
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Ln Statistics |
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Number of selectable parameters |
6 in xx.xx% format, visible on the Model 831 |
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Storage of Complete Table |
0.1 dB Steps |
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Spectral Statistics |
Requires Octave Analysis option ( 831-OB3 ) |
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Markers |
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Number of Markers |
10 |
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Prenamed Markers |
5 : Truck, Automobile, Motorcycle, Aircraft, Exclude |
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Link Marker to Automatic Sound Recording |
Yes, requires Sound Recording option ( 831-SR ) |
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Back Erase |
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Back Ease Time |
5 or 10 seconds |
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Supported Modes |
Manual |
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Measurement Control Modes |
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Available Modes |
Manual Stop, Timed Stop, Stop when Stable, Continuous, Single Block Timer, Daily Block Timer |
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Timed Stop Time in |
hh:mm:ss |
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Stop When Stable |
Delta level in xx.x dB and time in hh:mm:ss |
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Continuous with Daily Auto-Store |
1, 2, 4, 6, 12, 24, 48, 96 or 144 files per day, automated file numbering “yymmddnn.LD0” |
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Continuous Restart on Power Failure |
Automatic if powered by 12VDC |
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Single Block Timer |
Start date and time to End data and time |
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Daily Block Timer |
Up to 3 blocks with each start and end date, blocks can cross date line |
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Clock Stability |
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< 1 sec in 24 hours, at 75 ºF ( +24 ºC ) |
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< 10 sec in 30 days, at -40 to +158 ºF ( -40 to +70 ºC ) |
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Digital Voice Annotation |
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Annotate Recordings |
Use headset ( ACC003 ) or measurement microphone |
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Recording Sample Rate |
8 ksps |
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Listening Options |
On the Model 831 or using processing software for .wav files |