Precision sound level meter LD-831 C.

      • Class 1 precision sound level meters (IEC 61672-1: 2013, ANSI S1. 4-2014),
      • High resolution LCD colour display,
      • Real time-frequency analysis in 1/1 and 1/3 octave bands IEC 61260:2014 and ANSI S1. 11-2014 class 1,
      • Frequency weighting: A, C, Z at the same time,
      • Voice & sound recording
      • 2 GB of internal memory, expandable via USB,
      • Data sharing and remote control via 4 G, WiFi or LAN
      • 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)<span≤30 µs
      reference level114.0 dB re. 20 uPA
      Reference level rangeOne big area 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 831c
      Storing the complete table0.1 dB steps
      Spectral statisticsRequires octave analysis option (831c-OB3)
      Number of markers10
      already numbered with names marker5: truck, passenger car, motorcycle, plane, exclusion (of the measurement)
      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 831c 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 ?
      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


      Specific References


      831C manual

      831C manual (PDF)

      Download (6.2M)

      831C brochure (German

      831C brochure (German

      Download (1.15M)

      831C brochure (PDF)

      831C brochure (PDF)

      Download (1.66M)