Svantek SVAN 979 - Page 260

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%
( )
2log20137 nA
n
−=