Chapter 6 — Pressure-field
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" Microphone Type 4192
Introduction
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
6
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6.1 Introduction
6.1.1 Description
Pressure-field
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" Microphone Type 4192 is an externally-polarized
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" pressure-
field microphone for sound measurements requiring random-incidence response in
accordance with the requirements of ANSI S1.4 Type 1 or for coupler measure-
ments, for example, in connection with telephone and hearing aid testing. Further-
more, it also satisfies the requirements of ANSI S 1.12 Type M. With its low
inherent noise and frequency range from 3.15Hz to 20kHz, it is very well suited for
a wide range of precision audio-frequency sound measurements.
The microphone requires a polarization voltage of 200V, provided by the instrument
or analyzer powering the associated preamplifier.
This rugged microphone is built to ensure high stability under a variety of condi-
tions. For example, the stainless steel alloy diaphragm withstands polluted industri-
al environments. The diaphragm clamping ring is firmly secured to ensure the
microphone’s reliability, even when the microphone is used without its protection
grid. When the microphone is used without its protection grid, it can be easily
flush-mounted or inserted into closed volumes as it can be supported by the dia-
phragm clamping ring, provided that a force of less than 5Newtons is applied.
The microphone is supplied with individual calibration data on a calibration chart
and on a 3
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" data disk in a case. This case can also contain a
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" Microphone
Preamplifier Type 2669.
Fig.6.1 Pressure-field
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" Microphone Type 4192 with Protection Grid DB3421 (included)
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