| General Specifications |
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Reference Level
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114.0 dB re. 20 µPa
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Reference Level Range
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Single large range for SLM measurements
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Reference Frequency
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1000 Hz
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Reference Direction
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0° is perpendicular to the microphone diaphragm
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Operating Temperature
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≤ ± 0.5 dB error between -22 °F to +122 °F (-30 °C to 50 °C)
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Storage Temperature
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-40 °F to 176 °F (-40 °C to 80 °C)
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Humidity
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≤ ± 0.5 dB error from 30% to 90% relative humidity at 104 °F (40 °C)
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Equivalent Microphone Impedance
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12 pF
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Digital Display Update Rate
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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
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None up to 200 ft (61 m) with EXCxxx cable
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Approvals
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CE, ROHS, WEEE
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Extended Weather Options
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-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
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0.1 dB
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Elapsed Time
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0.1 s
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Real Time Clock
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1 s
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Calendar
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Through January 1, 2038
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| Integration Time |
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Time Averaged Levels and Sound Exposure Levels
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Minimum
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0.1 s
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Maximum with Daily Autostore Enabled
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Unlimited
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Maximum with Daily Autostore Disabled
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> 23 days with error < 0.5 dB
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| Ln Statistics |
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Number of Selectable Parameters
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6 in xx.xx% format
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Distribution Resolution
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0.1 dB
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Spectral Statistics
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Requires Octave Analysis option (831C-OB3)
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| Markers |
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Number of Markers
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10
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Prenamed Markers
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Truck, Automobile, Motorcycle, Aircraft, Exclude
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Back Erase
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Back Erase Time
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5 or 10 s
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| Measurement Control Modes |
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Available Modes
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Manual Stop, Timed Stop, Stop when Stable, Continuous, Single Block Timer, Daily Block Timer
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Timed Stop
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Time in hh:mm:ss
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Stop When Stable
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Delta level in xx.x dB and time in hh:mm:ss
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Continuous with Daily Auto-Store
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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
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Automatic if powered by 12 VDC and continuous run mode
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Single Block Timer
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Start date and time to end date and time
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Daily Block Timer
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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
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| Microphone Input |
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Connector
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Latching 5-pin connector
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Input Impedance
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100 kΩ and 300 pF
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Full Scale Input (0 dB gain)
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14 Vpeak
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ICP Current (requires ADP074)
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4 mA
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| AC/DC Output |
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Jack
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2.5 mm (3/32 in) female
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AC Output Voltage Range
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± 14 Vpeak (preamplifier output)
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± 2.1 Vpeak with 0, 20 or 40 dB gain (for LINE inputs)
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AC Output Recommended Load
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10 kΩ or greater
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DC Output Voltage Scale
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10 mV per dB, 0 V for 0 dB, 1 V = 100 dB
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DC Output Frequency & Time Weighting
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Follows SLM Settings: A, C, or Z and S, F, or I
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| Power Supply |
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Batteries
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4-AA (LR6) NiMH, 1.5 V Lithium or Alkaline cells
(supplied with 2500 mAh NiMH)
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External Power (5 V from USB)
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USB Mini-B connector to
* USB interface from computer
* PSA029 AC to DC power adaptor
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External Power
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I/O connector: 10 to 25 VDC (Use cable CBL140)
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Operating Time (with power save options)
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> 18 hours (1.5 V Lithium batteries)
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> 8 hours (Alkaline or NiMH batteries)
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Power Consumption with PRM831
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1.1 W (backlight off, running)
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≤ 2 W (with DVX012)
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5 W (maximum)
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| Memory Retention |
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Data Memory
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Non-volatile flash memory, backup performed every minute
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Real-time Clock
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≥ 1 year with batteries removed
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