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Home Products Sound Sound Level / Dosimeter ACO Precision Sound Level Meter TYPE 6238, Class 1

ACO Precision Sound Level Meter TYPE 6238, Class 1

ACO Precision Sound Level Meter TYPE 6238, Class 1

On-site measurement of environmental noise is strongly expected to have high resolution and real-time analysing function on the spot. Moreover, in the field of product development such as car parts electric appliances, etc., it is required to measure and analyse the sound of ultra-low level more accurately, corresponding to the rise of consciousness that the acoustic characteristics such as silence, tone quality, etc., should be the part of the product, which is deeply related to our human hearing sensation.

 The function of TYPE 6238 can be extended quite easily to those such as measurement of various parameters for environmental noise, only by inserting option FFT Analysis Card into the card slot. Also, this equipment is provided with newly developed “0-dB function” for measuring ultra-low sound pressure level, symbolizing the next-generation sound level meter with extremely high resolution and reliability.


  • Type  :  TYPE 6238
  • Applicable Standards  :  JIS C1509-1:2005 class I; IEC 61672-1:2002 Class I
  • Frequency Range  :  5Hz - 20kHz (Conforms with measurement law 20Hz - 12.5kHz)
  • Microphone Type  :  TYPE 7146NR (-29dB,Stand-alone -27dB)
  • Measurement Level  :  A : 28 - 130dB (0 - 80dB/0-dB function in ON); C : 37 - 130dB; Z(FLAT) : 39 - 130dB; C peak : 55 - 135dB; Z(FLAT)peak : 60 - 135dB
  • Self-noise level  :  The lower limit of the measurement range in dB lies 8dB higher than self-noise level.
  • Linearity Range  :  100dB
  • Time weighting  :  Fast, Slow, Impulse
  • Frequency weighting  :  A, C, Z(FLAT)
  • Measurement items  :  Lp, LA, LC, LAeq, LAE, LAmax, LAmin, LAN, Lpeak, LCpeak, LAtm5, LAI, LAIeq
  • Measurement time  :  1s/3s/5s/10s/1min/5min/10min/15min/30min/1h/8h/12h/24h;         Manual(Max. 199h59m59s)
  • Sampling Time  :  20.8Us(Leq、Lmax、Lmin)、100ms(LN)
  • Data clear Function  :  Pause, and a function that deletes preceding 3 or 5 sec.; Memory start; Selectable Auto or Manual
  • Timer function  :  A marker can be set to start and stop the measurement at any specified moments.
  • Display  :  Liquid crystal and Backlight (128×64 points)
  • Digital display  :  Display range: 4 digit display
  • Date  :  Year/month/day/hour:minute:second
  • Pause  :  Normal pause function, as well as the function of cancelling the data before pausing the measurement, are available.
  • Data Storage Functions  :  Sound pressure level or Processed values stored in built-in Memory or Memory card
  • Manual Storage  :  Sound level, Calculation value, Memory time, Store the Sampling to Built-in memory or on Memory card,
  • Auto Storage  :  Sampling interval 100ms, 200ms, Sound level,Leq etc.
  • Processing Card  : Storage of calculation results
  • Operating temperature  :  Temperature:-10 – 50oC
  • Humidity  :  30%~90%RH(no condensation)
  • Size  :  86(W) x 285(H) x 46(D)
  • Weight  :  :Less than Approx. 450g (including Batteries)

1/1 and 1/3-octave Real-time Analysis Card

  • Applicable Standards  :  JIS C 1514 (IEC61260) : class I
  • Measurement mode  :  Lp, Leq, LE, Lmax (One of the measurement modes selected as above is displayed.)
  • Frequency analysis band  :
    • 1/1-octave filter: 16Hz, 31.5Hz, 63Hz, 125Hz, 250 Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, AP, OA
    • 1/3-octave filter: 12.5Hz, 16Hz, 20Hz, 25Hz, 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kHz, AP, OA
  • Part Number: