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Type 1021B
1/2'' Free-Field Microphone, Externally Polarized
Type ZX1021B is a low-sensitivity free-field microphone designed for specific Class 2 measurement applications.
Dyn. range : 30 – 150 dB
Freq. range : 20 – 12500 Hz
Polarization : 0 V (Prepolarized)
Sensitivity : 6.7 mV/Pa
Standards : PM2F
Type 1003 is designed for high-precision measurement where a microphone with high sensitivity is required.
Typical Use Cases
Precision sound measurement
Premium class ANSI sound level meters
Compliance with IEC 61672 Class 1
Use of Free-Field Microphones
Type 1003 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 40 kHz is required.
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 optimized 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.