3M SE Manuel D’Utilisation
Appendix B
147
Models SE and DL
Weighting (A, C, Z, F)
SPL measurements are commonly weighted (scaled) in relation to their frequency
components in order to provide a consistent basis for comparison to other measurements of
the same type. In addition to the standardized A, C and Z weighting curves, you can select F-
weighting (flat) which provides no weighting at all. The four SoundPro SE/DL weighting
curves are plotted together in Figure B-5, where the F-weighting curve has been shifted up by
5 dB for graphical clarity. The tolerance limits for F frequency weighting are the same as A,
C, and Z frequency weighting.
components in order to provide a consistent basis for comparison to other measurements of
the same type. In addition to the standardized A, C and Z weighting curves, you can select F-
weighting (flat) which provides no weighting at all. The four SoundPro SE/DL weighting
curves are plotted together in Figure B-5, where the F-weighting curve has been shifted up by
5 dB for graphical clarity. The tolerance limits for F frequency weighting are the same as A,
C, and Z frequency weighting.
Figure B-5: All frequency weightings plotted together
Windscreen
A covering for a microphone that reduces disturbances caused by wind and direct contact
with other surfaces.
with other surfaces.