Multifunction acoustic calibrator Type 4226

Multifunction Acoustic Calibrator Type 4226 enables simulated free-field calibration of microphones, sound level meters and other related instruments. Type 4226 generates accurate and stable sound pressure with a frequency varying from 31.5 Hz to 16 kHz in octave steps, plus a signal at 12.5 kHz.

Using the coupler provided, the test signal can be applied to either ½-inch or ¼-inch microphones, or picked up from an electrical output. For ease of use, Type 4226 can also apply a very accurate inverse A-weighting correction.

An external generator can be connected to Type 4226 if a frequency sweep or semi-automatic test is desired.


  • Simulated free- and diffuse-field calibration of microphones
  • Verification of ½" and ¼" microphone setups and acoustic instruments conforming to IEC 60651 and ANSI S 1.4-1983
  • Verification of instruments according to parts of IEC 61672


  • Conforms to EN/IEC 942 1988 Class I and ANSI S 1.40 – 1984
  • Wide frequency range: 31.5 Hz to 16 kHz in octave steps, plus 12.5 kHz signal
  • Calibration levels of 94 dB, 104 dB and 114 dB
  • Free-field simulation for most ½" Brüel & Kjær microphones
  • Inverse A-weighting
  • Recurrent pulses for time-weighting and burst signal checks
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.
Copyright © Brüel & Kjær. All Rights Reserved. Corporate Information Privacy Policy Legal Notices