measurement microphone / prepolarized / free-field / 1/2"
Bruel and Kjaer
free-field, 1/2", outdoor
Suitable for both outdoor and industrial environment measurements and for IEC 60651 Type 1 measurements and frequency analysis measurements
Prepolarized Free-field ½-inch Microphone Type 4940 offers significant benefits when used with portable instruments. It is particularly suitable for both outdoor and industrial environment measurements. It is also suitable for IEC 60651 Type 1 measurements and frequency analysis measurements.
Sound level meters
Noise measurements according to IEC and ANSI standards
Transport noise measurements
Wide dynamic range from 14.6 dB(A) – 146 dB (3% distortion limit)
Low ambient temperature coefficient
IEC 60651 Type 1 approved with Modular Precision Sound Level Meter Type 2231
The microphone is capable of withstanding the IEC 68 232 1 metre drop test.
CALIBRATION OF SENSITIVITY AND FREQUENCY RESPONDS
The sensitivity can be calibrated at 250 Hz using Pistonphone Type 4228 with ½-inch Adaptor DP 0776. The actuator response can be measured using Actuator UA 0033. The free-field response can be obtained by adding the type-specific, free-field corrections to the actuator response.