Influence Of Ambient Temperature - HBK Sound Calibrator Type 4231 Bedienungsanleitung

3.2

Influence of Ambient Temperature

Under normal conditions, the influence of changes in ambient
temperature on the sound pressure level produced by the calibrator is
so small that you can ignore it.
You can see the effect of ambient temperature changes in Fig.3.2.
These are mainly caused by variations in the reference microphone's
sensitivity. The electronic compensation corrects for the main
influence of temperature on the microphone's nominal sensitivity, and
the deviation is caused by the variation from this nominal value.
Fig.3.2 Typical calibration uncertainty at 101.3 kPa due to variation in ambient
temperature
Calibra on
Devia on
in dB
0.05
0.045
0
– 10
– 0.045
– 0.05
12
Calibra on
point
0 10 20
IEC 60942
Specifica on range
Sound Calibrator Type 4231
User Manual
Influence of Ambient Temperature
temperature
30 40 50
Ambient
in °C
930278/5