Svantek SV 977D - Page 333

333
SV 977D User Manual - Appendixes
The starting point at which tests of level linearity shall begin is 94.0 dB for the frequencies specifies below. For
the Low measurement range and A weighting linearity test at 31.5 Hz, the starting point is 74 dB.
Table C.7.8. Linear operating ranges for the Low measurement range and the Outdoor Airport filter (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
25
80
27
103
27
117
32
120
25
80
27
103
27
117
28
83
52
120
500 Hz
25
116
27
119
27
120
32
120
25
116
27
119
27
120
28
119
52
123
1 kHz
25
120
27
120
27
120
32
120
25
120
27
120
27
120
28
123
52
123
4 kHz
25
121
27
119
27
119
32
120
25
121
27
119
27
119
28
124
52
123
8 kHz
25
119
27
117
27
117
32
120
25
119
27
117
27
117
28
122
52
120
12.5
kHz
25
115
27
114
27
114
32
120
25
115
27
114
27
114
28
118
52
117
Table C.7.9. Linear operating ranges for the High measurement range and the Outdoor Airport filter (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
37
97
37
120
37
134
42
137
37
97
37
120
37
134
40
100
72
137
500 Hz
37
133
37
136
37
137
42
137
37
133
37
136
37
137
40
136
72
140
1 kHz
37
137
37
137
37
137
42
137
37
137
37
137
37
137
40
140
72
140
4 kHz
37
138
37
136
37
136
42
137
37
138
37
136
37
136
40
141
72
139
8 kHz
37
136
37
134
37
134
42
137
37
136
37
134
37
134
40
139
72
137
12.5
kHz
37
132
37
131
37
131
42
137
37
132
37
131
37
131
40
135
72
134
Table C.7.10. Self-generated noise for different weighting filters
Electrical *)
Acoustical compensated
Weighting filter
Range
A
C
Z
A
C
Z
Low
< 15 dB
< 14 dB
< 20 dB
< 17 dB
< 19 dB
< 24 dB
High
< 25 dB
< 25 dB
< 32 dB
< 30 dB
< 30 dB
< 34 dB
*) measured with the ST 02 microphone equivalent impedance 18 pF +/-10%, averaging time – 30 s