In accordance with growing environment conservation, the evaluation of environmental noise such as traffic noise or industrial equipment noise, or better understanding of the labour health environment at offices, factories, etc. are getting more important than ever before. On-site measurement of environmental noise is strongly expected to have high resolution and real-time analysing function on the spot.

Low frequency sound pressure level meter, Precision sound level meter TYPE 6238L displays its greatest force in these cases.

In Low frequency sound pressure level meter TYPE 6238L, replacing the card with G-card enables to measure G-weighted sound pressure level and 1/3-octave real-time analysis. This equipment is symbolizing the next-generation sound level meter with extremely high resolution and reliability.

In Precision sound level meter TYPE 6238L, the function can be extended quite easily to those such as measurement of various parameters, only by inserting option FFT Analysis Card into the card slot.

• ACO_Low_Frequency_Sound_Pressure_level_Meter,_Model_6238L_datasheet

Specification

• Applicable Standards  :  JIS C 1514:2002 Class I; ISO　7196:1995
• Frequency Range  :  FLAT(FLAT: 1 - 100Hz); G-weighted sound pressure level: LG(G ISO 7196 Reference); 1/3-octave (FLAT:1 - 80Hz)
• Microphone Type  :  (Sensitivity) TYPE 7146NL(-28dB, Stand-alone -26dB)
• Frequency analysis band  :  1/3-octave (1Hz, 1.25Hz, 1.6Hz, 2Hz, 2.5Hz, 3.15Hz, 4Hz, 5Hz, 6.3Hz, 8Hz, 10Hz, 12.5Hz, 16Hz, 20Hz, 25Hz, 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, OA, AP, G)
• Measurement Level  :  G:40dB - 130dB; FLAT : 50dB - 130dB; 1/3-octave : 30dB - 130dB
• Overload characteristic  :  +3dB from upper limited scale
• Time weighting  :  Fast, Slow, 10sec  
• Measurement items  :  LP, LG, Leq, Lmax
• Measurement time  :  1s, 3s ,5s, 10s, 1min, 5min, 10min, 15min, 30min, 1h, 8h, 12h, 24h ; Manual(Max. 199h59m59s)
• Sampling Time  :  20.8μs(Leq, Lmax, Lmin, Lpeq, Lpmax); 666μs(LGeq,LGmax),64ms(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); Display range : 4digit display
• Date　 :　 Year/month/day/hour：minute：second
• 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.
• Battery life (continuous time)  :  Alkaline dry cell ; Approx.9hours when Switch on a back light ; Approx.1/3 Consumption ampere:150mA (6V input) when processing function is OFF When AC adaptor is used ; Approx.2.7VA
• Operating temperature  :  Temperature：-10 – 50^oC
• Humidity  :  30%～90%RH(no condensation)
• Size  :  85(W) x 328(H) x 48(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