Measurement microphone 4190

externally-polarizedfrequencyclass 1

Free-field microphone designed for high-precision measurements, requiring high sensitivity with a frequency response of 3 Hz to 20 kHz. Type 4190-L-001 is designed for high-precision free-field measurements where a microphone with high sensitivity is required. Precision sound measurement Premium class sound level meters Equipment complying with IEC 61672 class 1 USE OF FREE-FIELD MICROPHONES At 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. STABILITY A press-fitted, stainless-steel diaphragm ensures superior long-term stability and mechanical robustness – Type 4190 will withstand the 1 m drop test of IEC 60068-2-32. POLARIZATION VOLTAGE Type 4190 requires an external polarization voltage and must therefore be used with a classical preamplifier.