Chapter 7 — Low-frequency Pressure-field
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" Microphone Type 4193
Introduction
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
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7.1 Introduction
7.1.1 Description
Low-frequency Pressure-field
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" Microphone Type 4193 is an externally-polarized
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" pressure-field microphone. With its low inherent noise and frequency range
extending all the way from 70mHz to 20kHz, it is very well suited for measuring
infrasound, for example in ships engine rooms, in helicopters and in wind-buffeted
buildings. Furthermore, it satisfies the requirements of ANSI S1.4 Type 1 and
ANSI S 1.12 Type M.
This microphone is supplied with a special Low-frequency Adaptor UC0211 which,
because of the extra capacitance it introduces, has the effect of reducing the lower
cut-off frequency of the preamplifier — in the case of
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" Microphone Preamplifier
Type 2669, down to 0.1Hz.
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
Fig.7.1 Low-frequency Pressure-field
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" Microphone Type 4193 with Protection Grid DB3421
and Adaptor UC0211 (included)
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