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6
Sound Intensity Calibrator Type 4297 – User Manual
Fig.1.5
Typical intensity and sound pressure levels measured without spacer
90
SPL in Coupler
80
70
60
Intensity Level in Coupler
50
40
30
20
Pressure-Residual Intensity Index
10
0
10
1.2.2
Calibration Chart
A calibration chart is supplied with each instrument in the lid of the protective case. This confirms
that the specification of the calibrator is within the stated limits. The following information is
provided:
•
Product serial number
•
Sound pressure level
•
Frequency
•
Reference conditions
•
Pink noise sound pressure level
The date of issue of the calibration chart and the signature of the test engineer who performed
the tests are shown. An example of a calibration chart is shown in Fig. 1.6.
100
Frequency (Hz)
1000
10000
010246
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