FEATURES
    ¤ Fulfils Standard ：IEC 60318-1 (IEC 60318)
    ¤ Acoustical impedance similar to that of the human ear
USES
    ¤ Frequency response and sensitivity measurements
       on telephone receivers and earphones
    ¤ Calibration of audiometers
Speciations
PERFORMANCE SPECIFICATIONS
    Used with Microphone ：Model AWA14422 1/2 inch pressure field Microphone
    Used with Preamplifier：Model AWA14601 Preamplifier
POWER SUPPLY
    Operation Voltage Range for the Preamplifier：12V~36V
ENVIRONMENTAL
    Operating Temperature: -10°C ~ +50°C     Humidity: 25% ~ 90%(RH)
    Atmospheric Pressure: 65 kPa ~ 108 kPa
PHYSICAL
    Dimensions: Φ59 mm×75 mm (no include cable)    Weight: 0.5 kg (include cable)
    Coupler volumes: Connections between cavities
    Volume Acoustic Capacitance Acoustic Resistance Acoustic Inductance
     V1  2.5cm3±1% 17.6×10-12m5/N    Annular slit: 6.5×106Ns/m5 5×102Ns/m5
     V2  1.8cm3±1% 12.7×10-12m5/N    Four parallel holes 20×106Ns/m5 5×102Ns/m5
     V3  7.5cm3±1% 52.8×10-12m5/N
   Cable Length：2m ,
ACCESSORIES:
    Included: Model AWA14422 1/2" pressure field Microphone × 1
                 Model AWA14601 Preamplifier × 1          Instruction Manual x 1
                 Earphone adapter × 1                         Leather case × 1