Svantek SVAN 977A - Page 202

202
SVAN 977A User Manual - Appendixes
Measuring ranges
Reference measuring range of the acoustic pressure Low
Measuring frequency range of the acoustic pressure (-3 dB) 10 Hz ÷ 20 000 Hz.
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).
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. 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 977A diffuse field compensation filter
Note: Using special filters might change the frequency response and measuring ranges of
SVAN 977A. Please check the below given specification.