Precision sound level meter LD-831

  • Integrating precision sound level meter,
  • LCD display with high contrast,
  • Time reviews: Slow, fast pulse, integration, and peak at the same time,
  • Frequency weighting: A, C, Z at the same time (AnyData),.
  • Octave and octave band frequency analysis,
  • Voice commentary & sound recording
  • standards IEC 60651, IEC 60804, IEC 61260, IEC 61672,
  • With METAS, PTB approval class 1

basic data
Averaging (integration method)Linear or exponential
RMS-term reviewSlow, fast or pulse
frequencyA, C or Z
Peak FrequencyA, C or Z
reinforcement0 dB or +20 dB
doubling rates3, 4, 5 or 6 dB with option 831-IH
sampling rate51,200 Hz
Rise time (peak value)30 microseconds
reference level114.0 dB re. 20 uPA
Reference level rangeSingle large range for SLM Normal Option OBA, Gain 0 dB
reference frequency1000 Hz
reference direction0 ° is perpendicular to the microphone diaphragm
temperature≤ ± 0.5 dB error between -10 ... 50 ° C
storage temperature-20 ... 70 ° C
humidity≤ ± 0.5 dB error of 30 ... 90% RH at 40 ° C
Equivalent impedance microphone12 pF for 1/2 "microphone Larson Davis
Field level error (option OBA)≤ ± 0.1 dB relative to the reference region
Refresh rate of the screenFour times per second (0.25 seconds between updates). 
The first display is 0.25 seconds after initialization of the meter is available.
Impact of an extension cordNo effect (up to 61 m with EXCxxx cable)
Electrostatic dischargesThe device is not adversely affected by electrostatic discharge.
Extended weather options-40 ... +70 ° C with CE-831-E
level0.1 dB
Elapsed time0.1 s
Real Time Clock1 s
calendarUntil December 31, 2100
integration time
Time-averaged values ​​and sound exposure level (s)
   minimum0.1 s
   Maximum active daily 
   Maximum daily with inactive 
> 23 days with <0.5 dB error
Dosimeter measurements: TWA, noise dose (s)
   minimum0.1 s
In statistics
Number of selectable parameters6 in the format xx, xx%, visible on the Model 831
Storing the complete table0.1 dB steps
Spectral statisticsRequires option octave (831-OB3)
Number of markers10
already numbered with names marker5: truck, passenger car, motorcycle, plane, exclusion (of the measurement)
Compound marker for automatic sound recordingYes, requires option sound recording (831-SR)
Backward-delete function
Backward erase time5 or 10 seconds
Supported modesManually
Control modes for the measurement
existing modesManual stop, timed stop, stop if stable, continuous, single-block timing, daily block timing
Timed stopTime in hh: mm: ss
Stop if stableLevel difference in xx.x dB and time in hh: mm: ss
Continuously with daily automatic storage1, 2, 4, 6, 12, 24, 48, 96 or 144 files per day, automated file number 'yymmddnn.LD0'
Continuous restart after power failureAutomatically at 12 V DC
Single block timingStart: date and time; End: date and time
Day Block TimingUp to 3 blocks with each start and end dates, blocks the dateline may exceed
term stability
stability<1 s in 24 hours at 24 ° C 
<10 s in 30 days (-40 ... 70 ° C)
Digital voice comment
comment recordsWith headset (ACC003) or measuring microphone
Sampling rate of the recording8 ksps
monitoring optionsModel 831 or processing software for .wav files
AC / DC output
Rifle2.5 mm, for cable CBL139
AC output - voltage range± 2.3 V pk  maximum 0.5 ... 1.6 V mV rms  sinusoidal
AC output - Recommended loadheadset; Speaker impedance> 16 Ω
DC output - voltage scale10 mV per dB, 100 dB for 1 V
DC output - frequency and timeCorrespond to the SLM settings: A, C or Z and S, F or I
Signal tap the preamplifierWith ADP015 and EXC006
power supply
batteries4 AA (LR6), NiMH, 1.5V 
lithium or alkaline cells 
(included NiMH, 2500 mAh)
External power supply (USB port)USB mini-B connector on
  • USB port of the computer
  • Power Supply PSA029 with AC voltage
  • USB hub
  • Voltage converter PSA031, 12 V DC  to 5 volts DC
external supplySupply via I / O port: 10.0 to 15.5 V DC
with cable CBL140, CBL154 or interface unit 831-INT
Operating time with 1.5 V lithium> 24 h with saving options (L eq Recording interval with 1 s)
Power consumption with PRM8311.1 W (without backlight, in the active mode of operation)
memory option
data storageNon-volatile flash memory, backup every minute
Real time clockStay min. 10 min obtained without batteries
Other features
Broadband noiseSee PDF data sheet
Specifications of the preamplifier (PRM831)See PDF data sheet
Specifications Model 831 with PRM831 and microphone 377B02See PDF data sheet

available options
(831-LOG) measured value over time of 20 ms ... 24 h
specificationsSee PDF data sheet
(831-ELA) Automatic Incident Detection and history (intermittently or daily history)
specificationsSee PDF data sheet
(831-OB3) octave and Terzbandanalysen in real time
specificationsSee PDF data sheet
(831-SR) sound recording, automatically triggered by events (requires 831-ELA)
specificationsSee PDF data sheet
(831-FST) Fast reading time course with intervals of 2.5 ms ... 24 h (LOG requires 831-and 831-OB3)
specificationsSee PDF data sheet
(831-IH) Occupational Safety measurements
specificationsSee PDF data sheet
(831-COMM) communication option for EDGE modem (MDMUSB-E)
specificationsSee PDF data sheet
(831-RT) reverberation time analysis
specificationsSee PDF data sheet
(831-FFT) FFT analysis
specificationsSee PDF data sheet
(831-MSR) measurement history and sound recording
specificationsSee PDF data sheet

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