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164/PB/2011/NA dated 20.05.2011 and 202/CR/2012/NA dated 26.04.2012
Passive Attenuation
Frequency (Hz)
Mean Attenuation (dB)
Standard Deviation (dB)
APV (dB)
H = 26 dB M = 21 dB L = 20 dB SNR = 25 dB
Active Attenuation – Criterion Levels
Switch position
LO (-15)
HI (-9)
H: Average attenuation characteristics in the high frequency spectrum (>2 kHz)
M: Average attenuation characteristics in the mid frequency spectrum (0.5-2 kHz)
L: Average attenuation characteristics in the low frequency spectrum (<0.5 kHz)
SNR (Single Number Rating): Average attenuation characteristics in the standard
frequency spectrum
The European Union testing was conducted by:
Central Institute for Labour Protection—National Research Institute (CIOP-PIB)
ul Czerniakowska 16, 00-701 Warsaw, Poland. Notified Body No. 1437.
This product is in compliance with EN 352-2:2002 and EN 352-7:2002.
125
250
500
25.3 24.0 24.3 25.6
5.9
4.6
5.6
19.4 19.5 18.8 20.9
H-noise
104
99
1000
2000
4000 8000
29.6 32.5 34.8
4.8
3.3
26.3 28.7 30.8
M-noise
96
93
3.8
4.0
L-noise
86
85
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