Svantek SVAN 979, Руководство пользователя

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260
SVAN 979 User Manual - Appendixes
Table C.1.2.
Linear operating range: „HIGH“ (primary level range) for the sinusoidal signal and
microphone sensitivity 50 mV/Pa
[dB]
L
AS/F
L
BS/F
L
CS/F
L
ZS/F
L
AeqT
L
BeqT
L
CeqT
L
AE
L
Cpeak
(t
int
= 2 s)
from to from to from to from to from to from to from to from to from to
31,5 Hz 30 97 30 120 30 134 40 137 30 97 30 120 30 134 33 100 70 137
500
Hz
30 133 30 136 30 137 40 137 30 133 30 136 30 137 33 136 70 140
1 kHz 30 137 30 137 30 137 40 137 30 137 30 137 30 137 33 140 70 140
4 kHz
30 138 30 136 30 136 40 137 30 138 30 136 30 136 33 141 70 139
8 kHz
30 136 30 134 30 134 40 137 30 136 30 134 30 134 33 139 70 137
12.5
kHz
30 132 30 131 30 131 40 137 30 132 30 131 30 131 33 135 70 134
Note: For the signals with the crest factor n > 1.41 upper measurement range of the RMS (LEQ and
SPL) is reduced. The valid upper limit can be calculated according to the below given formula:
, where A is the upper limit for the sinusoidal signal
Example: For the crest factor n = 10 the upper limit is A
10
= 120 dB
Measurement ranges
Reference measurement range of the acoustic pressure High
Measurement frequency range of the acoustic pressure (-3 dB) 3.15
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
•
G meeting requirements of the ISO 7196:1995 standard
Table C.1.3. Self-generated noise for different weighting filters
Electrical *) Acoustical compensated
Weighting filter
Range
A C Z A C Z
Low < 11 dB < 10 dB < 16 dB < 12 dB < 12 dB < 28 dB
High < 19 dB < 18 dB < 26 dB < 20 dB < 20 dB < 30 dB
*) measured with the ST 02 microphone equivalent impedance 18
pF ± 10%
( )
2 log 20 137 n A
n
− =