Bruel & Kjaer 4227 FOR RENT

Bruel & Kjaer 4227 Highlights

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.

• Conforms to IEEE-269, IEEE-661 and ITU-T P.51
• Accurate level and frequency response calibration is easily done using a Bruel & Kjaer 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
• Low distortion
• Built-in overload protection circuit
• At 25mm from lip ring, 20mm diameter Mouth Opening, Low-distortion sound source used for testing acoustic transducers