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.
Part No
1) ACO Model 6238 – Precision Sound Level Meter, Class 1
Specification
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 – 50 o C
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
ACO Precision Sound Level Meter TYPE 6238 datasheet
