½-INCH FREE-FIELD MICROPHONE, 6.3 HZ TO 20 KHZ, 200V POLARIZATION
Designed for high-precision free-field measurements where a 20 kHz microphone with high sensitivity is required.
Type 4190 is designed for high-precision free-field measurements where a microphone with high sensitivity is required. Being external polarized type 4190 must be used with classical preamplifier.
Precision sound measurement
Premium class sound level meters
Equipment complying with IEC 61672 class 1
USE OF FREE-FIELD MICROPHONESAt higher frequencies, reflections and diffractions cause a pressure increase in front of the diaphragm of a microphone. If not corrected for this would result in an increased output voltage. A free-field optimisation means that the frequency response of the microphone has been designed in such a way that the free-field response at 0 degrees incidence is flat. This microphone is optimised for use with the protection grid in place.
Free-field microphones are commonly used for sound measurement in an anechoic chamber or far away from reflecting buildings, etc. Another area for free-field microphones is for general electroacoustic measurements like loudspeaker and microphone measurements.
Type 4190 is not only suited for use in class 1 Sound Level Meters but also for all high-precision acoustic measurements where a robust and stable, externally polarized free-field microphone with an upper frequency of 20 kHz is required.