B&K 2250 Light Bedienungsanleitung PDF herunterladen (Seite 147)

139

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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B&K 2250 Light Bedienungsanleitung Seite 147