Description
Additional Features:
- Well defined sound source
- High calibration level: 124 dB SPL at microphone diaphragm
- Accurate calibration within +/- 0,2 dB
- Transistorized frequency control
- Individually calibrated
- Battery Operated
- Fits 1″, 1/2″, 1/4″ and 1/8″ microphones
The Bruel & Kjaer 4220 is a Pistonphone that is a compact battery operated precision sound source. It is designed to enable quick and accurate overall calibration of sound measuring equipment. It provides a sound pressure level of 124 dB at a frequency of 250 Hz.
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