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SVAN 971 User Manual
– Appendixes
145
Weighting filters
(see part C.3)
•
Z
meeting requirements of the IEC 61672-1:2013 standard for the Class 1
“
Z
“ filter
•
A
meeting requirements of the IEC 651 and IEC 61672-1:2013 standard for the Class
1 “
A
” filter
•
B
meeting requirements of the IEC 651 and IEC 61672-1:2013 standard for the Class
1 “
B
” filter
•
C
meeting requirements of the IEC 651 and IEC 61672-1:2013 standard for the Class
1 “
C
” filter
Table C.1.3.
Table C.1.3. Self-generated noise for different weighting filters
Electrical *)
Acoustical compensated
Weighting filter
Range
A
C
Z
A
C
Z
Low
< 12 dB
< 12 dB
< 17 dB
< 15 dB
< 15 dB
< 20 dB
High
< 22 dB
< 22 dB
< 26 dB
< 25 dB
< 25 dB
< 30 dB
*) measured with the
ST 02
microphone equivalent impedance
18 pF
± 10%
Special filters
•
Diffuse field
– compensation filter
filter improving the complete instrument frequency response in
the diffuse acoustic field (see below)
•
Windscreen
– compensation filter
▪
filter improving the instrument frequency response in the free
acoustic field when windscreen SA22 is mounted on the
microphone (see C.1.2)
SVAN 971 diffuse field compensation filter
Note: Using special filters might change the frequency response and measuring ranges of the
971. Please check the below given specification.
Содержание SVAN 971
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