Chapter 7 — Low-frequency Pressure-field
1
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" Microphone Type 4193
Effect of Temperature
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Microphone Handbook
Brüel & Kjær
7
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26
7.11 Effect of Temperature
By careful selection of materials, optimization of the design and artificial ageing,
the effect of temperature has been made to be very low.
The microphone has been designed to operate at temperatures from –30 to 300°C.
When the microphone is subjected to temperatures above 200°C, it may be discol-
oured but its functionality will remain unaffected. See section 7.10.2 for permanent
changes in sensitivity at temperatures above 170°C.
The reversible changes are shown in Fig.7.23 as a change in sensitivity and in
Fig.7.26 to Fig.7.26 as changes in the frequency response normalized at 250Hz.
Temperature Coefficient (250Hz):
–0.002dB/°C, typical (for the range –10 to +50°C)
Fig.7.23 Typical variation in sensitivity (at 250Hz) as a function
of temperature, relative to the sensitivity at 20°C
940876e
– 2.0
– 1.5
– 1.0
– 0.5
0.0
0.5
– 50 0 50 100 150 200 250 300
Temperature (°C)
– 2.5
Response (dB)
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