Chapter 3 — Prepolarized Free-field
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" Microphone Type 4189
Effect of Temperature
Falcon™ Range of Microphone Products
Microphone Handbook
BE1375– 12
3
−
23
The reversible changes are shown in Fig.3.20 as a change in sensitivity and in
Fig.3.21 and Fig.3.22 as changes in the frequency response normalized at 250Hz.
Temperature Coefficient (250Hz):
–0.001dB/°C, typical (for the range –10 to +50°C)
The effect of temperature on the free-field response (see Fig.3.22) of the microphone
is the sum of the following effects:
●
the calculated effect of the change in the speed of sound due to temperature on
the 0°-incidence free-field correction
●
the measured change in the actuator response due to temperature (see Fig.3.21).
Fig.3.20 Typical variation in sensitivity (at 250Hz) as a function
of temperature, relative to the sensitivity at 20°C
940874e
– 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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