Sound Calibrator Type 4231

A handy, portable sound source for calibration of sound level meters and other sound measurement equipment. The calibrator is very robust and stable, and conforms to EN/IEC 60942 Class LS and Class 1, and ANSI S1.40-1984.

For maximum confidence in your measurement results you can quickly compensate for local measurement conditions by calibrating before every measurement. Twin sound pressure levels guarantee definitive checks even in noisy environments, and ensure linearity in your microphones.


  • Calibration of sound level meters and other sound measurement equipment


  • Conforms to EN/IEC 60942 (2003) Class LS and Class 1, and ANSI S1.40 – 1984
  • Robust, pocket-sized design with highly stable level and frequency
  • Calibration accuracy ± 0.2 dB
  • 94 dB SPL, or 114 dB SPL for calibration in noisy environments
  • Extremely small influence of static pressure and temperature
  • Sound pressure independent of microphone equivalent volume
  • 1 kHz calibration frequency for correct calibration level independent of weighting networks
  • Fits Brüel & Kjær 1" and 1/2" microphones (1/4" and 1/8" microphones with adaptor)
  • Switches off automatically when removed from the microphone
  • Sound calibrator Type 4231

    Quick and easy

    In five seconds you can have a definitive calibration check. There are few options – simply click a microphone into place, press the button and it is done.

    There is no need to remove the protective leather case to use it, and you don’t have to spend time ensuring the fit is exact. Because of the 1000 kHz calibration frequency, there is no need to use filters for different weighting networks.


    This compact unit gives you a battery-operated sound source wherever you need it.

  • Sound Calibrator - Type 4231

    One calibrator for all microphones

    It can be used with various microphones as adaptors easily click into place. It also automatically adjusts to give the same sound pressure level for each different type of microphone you use, ensuring easy operation.
  • Built for years to come

    Tough plastic encases the all-electronic components, which guarantee that long-term stability is not affected by external influences like barometric pressure.
  • Calibration centre

    Calibration is what we do

    Our dedicated calibration centres around the world directly trace their own calibration to all relevant national standards. As standards often change, we always follow them closely – in fact we have a long history of helping to create them.
We help our customers measure and manage the quality of sound and vibration in their products and in the environment

Brüel & Kjær Sound & Vibration Measurement A/S. P +45 77 41 20 00. F +45 45 80 14 05.
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