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Sound Level Meter Model 831C Larson Davis |
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Standards Met by Model 831C |
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The Model 831C meets the specifications of the following standards : |
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Sound Level Meter Standards |
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IEC61672-1 Ed. 2.0 ( 2013 ) Class 1, Group X |
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IEC60651 Ed 1.2 ( 2001 ) plus Amendment 1 (1993-02 ) and Amendment 2 ( 2000-10 ) Type 1, Group X |
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IEC60804 ( 2000-10 ) Type 1, Group X |
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ANSI S1.4-2014 Class 1 |
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ANSI S1.43-1997 Type 1 |
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DIN 45657 |
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Octave Filter Standards ( Option 831C- OB3 ) |
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IEC61260 Ed. 2.0 ( 2014 ) Class 1, all filters |
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ANSI S1.11-2014 Class 1, all filters |
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Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use |
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2006/95/EC Low Voltage Safety Directive |
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IEC 61010-1 Ed. 3.0 ( 2010-06 ) |
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EMC Immunity and Emission |
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2004/08/EC EMC Directive |
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IEC 61326-1 Ed. 2.0 ( 2012-07 ) |
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IEC 61672-1 Ed. 2.0 ( 2013-09 ) |
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FCC Title 47 CRF Part 15, Class B |
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Sound Level Meter Specifications |
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Averaging ( Integration Method ) |
Linear or Exponential |
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Time Weightings |
Slow, Fast,or Impulse |
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Frequency Weightings |
A, C, and 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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Sample Rate |
51,200 Hz |
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Peak Rise Time |
30 μs |
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Metrics Measured |
Leq, Lmax, Lmin, Lpeak, Ln ( 6 values ), LDN, LDEN,LCeq–LAeq |
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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 |
17.3 oz |
490 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 measurements |
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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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Operating Temperature |
≤ ± 0.5 dB error between -22 °F to +122 °F ( -30 °C to 50 °C ) |
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Storage Temperature |
-40 °F to 176 °F ( -40 °C to 80 °C ) |
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Humidity |
≤ ± 0.5 dB error from 30 % to 90 % RH at 104 °F( 40 °C ) |
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Equivalent Microphone Impedance |
12 pF |
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Effect of an Extension Cable |
None up to 200 ft ( 61 m ) with EXCxxx cable |
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Approvals |
CE, ROHS, WEEE |
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Extended Weather Options |
-40 °F to +158 ºF ( -40 °C 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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Elapsed Time |
0.1 s |
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Real Time Clock |
1 s |
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Integration Time |
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Time Averaged Levels and Sound Exposure Levels |
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Minimum |
0.1 s |
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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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Ln Statistics |
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Number of Selectable Parameters 6 in xx.xx% format |
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Distribution Resolution 0.1 dB |
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Spectral Statistics Requires Octave Analysis option ( 831C-OB3 ) |
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Markers |
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Number of Markers |
10 |
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Prenamed Markers |
Truck, Automobile, Motorcycle, Aircraft, Exclude |
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Back Erase |
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Back Erase Time |
5 or 10 s |
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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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Restart after Power Failure |
Automatic if powered by 12 VDC and continuous run mode |
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Single Block Timer |
Start date and time to end date and time |
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Daily Block Timer |
Up to 3 blocks between each start and end date |
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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 °F to +158 °F ( -40 °C to +70 °C ) |
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< 1 s when using NTP |