Svantek SVAN 958A - Page 262

262
SVAN 958A User Manual
• SA277D Environment compensation filter that improves the complete instrument
frequency response in the free field for the reference acoustic
wave incidence angle 90 deg
• SA277D Airport compensation filter that improves the complete instrument
frequency response in the free field for the reference acoustic
wave incidence angle 0 deg
Note: For the conformance of acoustical tests with SA 277D, the Environment or Airport
compensation must be switched on.
Statement of performance
SVAN 958A working as the SLM with SA 277D meets requirements of IEC 61672:2013 for the Class 1
Group X instruments.
Linear operating ranges with the SA277D Environment filter
The starting point at which tests of level linearity shall begin is 94.0 dB for the frequencies specifies below. For
A weighting linearity test at 31.5 Hz and 12.5 kHz, the starting point is 69 dB.
Table C.8.1. Linear operating ranges for the Low measurement range and the SA277D Environment filter
(for the sinusoidal signal and microphone sensitivity 50 mV/Pa)
[dB]
L
AS/F
L
CS/F
L
LINS/F
L
AeqT
L
CeqT
L
AE
L
Cpeak
(t
int
= 2 s)
from
to
from
to
from
to
from
to
from
to
from
to
from
to
31.5 Hz
26
75
26
112
32
115
26
75
26
112
29
78
52
115
500 Hz
26
115
26
115
32
115
26
115
26
115
29
118
52
118
1 kHz
26
116
26
114
32
115
26
116
26
114
29
119
52
117
4 kHz
26
114
26
112
32
115
26
114
26
112
29
117
52
115
8 kHz
26
110
26
109
32
115
26
110
26
109
29
113
52
112
12.5 kHz
26
75
26
112
32
115
26
75
26
112
29
78
52
115
Table C.8.2. Linear operating ranges for the High measurement range and the SA277D Environment filter
(for the sinusoidal signal and microphone sensitivity 50 mV/Pa)
[dB]
L
AS/F
L
CS/F
L
LINS/F
L
AeqT
L
CeqT
L
AE
L
Cpeak
(t
int
= 2 s)
from
to
from
to
from
to
from
to
from
to
from
to
from
to
31.5 Hz
46
97
46
134
48
137
46
97
46
134
49
100
72
137
500 Hz
46
137
46
137
48
137
46
137
46
137
49
140
72
140
1 kHz
46
138
46
136
48
137
46
138
46
136
49
141
72
139
4 kHz
46
136
46
134
48
137
46
136
46
134
49
139
72
137
8 kHz
46
132
46
131
48
137
46
132
46
131
49
135
72
134
12.5 kHz
46
97
46
134
48
137
46
97
46
134
49
100
72
137