Reference calibrator

Reference calibrator

  1. 42AA Pistonphone
    Sound pressure level: 114 dB
    Freq range: 250 Hz
    IEC: 60942

    G.R.A.S. 42AA Pistonphone, Class 1

    The G.R.A.S. Pistonphone 42AA is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters, and other sound measuring equipment.

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  2. 42AP Intelligent Pistonphone
    Sound pressure level: 114 dB
    Freq range: 250 or 251.2 Hz
    ANSI: S1.40
    IEC:60942

    G.R.A.S. 42AP Intelligent Pistonphone, Class 0

    The G.R.A.S. 42AP Pistonphone is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters and other sound measuring equipment.

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  3. 42AC High Pressure Pistonphone
    Sound pressure level: 134 dB
    Freq range: 250 Hz
    ANSI: S1.40
    IEC: 60942

    G.R.A.S. 42AC Pistonphone, high pressure, Class 1

    The G.R.A.S. 42AC Pistonphone, high pressure is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 134 dB re. 20µPa (equivalent to 100 Pa) at 250 Hz, or 125.4 dBA re. 20µPa. 

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