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Appendix A
Setup Parameters
This appendix describes all the setup parameters included in a template.
A.1 Input
For outdoor measurements, it is often necessary to mount a windscreen on the microphone to
reduce the measured wind noise. This has, however, a small impact on the overall frequency
response of the analyzer.
Table A.1
Input parameter
Parameter Values Comment
Sound Field Correction Free-field
Diffuse-field
Select a correction matching the sound field of
your measurements. that is, you can make correct
measurements in a diffuse-field using a Type 4950
free-field microphone, by selecting Diffuse-field
correction. Even free-field correction of a free-field
microphone will enhance the overall frequency
response of the system. Generally, ISO requires
free-field conditions and ANSI requires diffuse-field
conditions. Check your local standards for the
setting you require.
No correction is made for unknown transducers
Loudness Free-field
Diffuse-field
Auto
Determines whether Loudness and Loudness
Level are calculated based on Free-field or
Diffuse-field conditions. Set to Auto to follow the
setting of Sound Field Correction. For an unknown
microphone type, you can set Loudness to the
condition matching your request.
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