The Bruel and Kjaer 4227 is an accurate reference sound source developed for near field testing of telephone transmitters and microphones. It provides a standardised and realistic simulation of the human voice field.
Bruel and Kjaer 4227 Features:
Conforms to IEEE-269, IEEE-661 and ITU-T P.51.
Accurate level and frequency response calibration is easily done using a Brüel & Kjær ½" microphone placed in the supplied calibration jig
Accurate simulation of human voice field
Quality control testing of frequency response and distortion of telephone transmitters and close-talking microphones
Continuous SPL of 100dB 25mm from lip ring
Built-in overload protection circuit
Get email updates for Bruel and Kjaer 4227