EN - 20
5.2. A, C, Z WEIGHTING INSTRUCTION:
1. : The A weighting curve is based on 40 Phon Fletcher-Munson Equal Loudness
Contour, Noise assessment in human, suggest to use the A weighting.
2. The C weighting in essentially is approximate smooth. With labor safety concern,
suggest using the C weighting.
3. The Z weighting for the electric instrument interior not the linear signal which
processes after the filter, suits in wants to output AC or the DC signal does other
research to use.
The Z weighting is a linear signal which is not processed through the filter.
It’s suitable to output AC or DC signal for research.
4.
Sound Level Meter Class Description:
Class 0: use in the laboratory reference standard.
Class
1:
laboratory or field use.
Class
2:
laboratory or field use.
Class 3: general field use.
