TYPE 4964

TYPE 4964
Standard	IEC 61094
Sound field	Free field
Polarization voltage	0V
Sensitivity	50 mV/Pa
Lower limiting frequency	0.02 Hz
Higher limiting frequency	20 kHz
Inherent noise	14.2 dB(A)
Upper limiting of dynamic range	146 dB
Diameter	1/2 inch
Venting	Rear
Minimum Temperature	-30 °C
Maximum Temperature	150 °C
Minimum Temperature	-22 °F
Maximum Temperature	302 °F

At infrasound and frequencies below a few kHz, the pressure and free-field response are the same. At higher frequencies, reflections and diffractions cause pressure to increase in front of a microphone's diaphragm.

Type 4964 has been optimized for free-field, and designed for use with the protection grid in place. Type 4964 is also suited for use in class 1 sound level meters and for all high-precision acoustic measurements where a robust and stable free-field microphone with an upper frequency of 20 kHz is required.

A press-fitted, stainless-steel diaphragm ensures superior longterm stability and mechanical robustness – Type 4964 will withstand the 1 m drop test of IEC 60068–2–32.

As all Brüel & Kjær microphones, each Type 4964 is provided with an individual calibration chart including information about the open-circuit sensitivity, the frequency response in a free field as well as the electrostatic actuator response. Using the calibration data and the REq-X feature of LAN-XI, a real-time correction for different measurement situations can increase accuracy.

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TYPE 4964

INFRASOUND AND FREE-FIELD RESPONSE

BUILD AND STABILITY

INDIVIDUAL CALIBRATION

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