Svantek SVAN 977A - Page 203

203
SVAN 977A User Manual - Appendixes
Linear operating ranges for LEQ measurements with Diffuse Filter
Table C.1.4. Linear operating range for the “Diffuse” filter: “LOW” for the sinusoidal signal and microphone
sensitivity 35 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
26
80
26
103
26
117
32
120
26
80
26
103
26
117
29
83
50
120
500 Hz
26
116
26
119
26
120
32
120
26
116
26
119
26
120
29
119
50
123
1 kHz
26
120
26
120
26
120
32
120
26
120
26
120
26
120
29
123
50
123
4 kHz
26
121
26
119
26
119
32
120
26
121
26
119
26
119
29
124
50
123
8 kHz
26
119
26
117
26
117
32
120
26
119
26
117
26
117
29
123
50
120
12.5
kHz
26
115
26
114
26
114
32
120
26
115
26
114
26
114
29
118
50
117
Table C.1.5. Linear operating range for the “Diffuse” filter: „HIGH“ (primary level range) for the sinusoidal
signal and microphone sensitivity 35 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
36
97
36
120
36
134
42
137
36
97
36
120
36
134
39
100
60
137
500 Hz
36
133
36
136
36
137
42
137
36
133
36
136
36
137
39
136
60
140
1 kHz
36
137
36
137
36
137
42
137
36
137
36
137
36
137
39
140
60
140
4 kHz
36
138
36
136
36
136
42
137
36
138
36
136
36
136
39
141
60
139
8 kHz
36
136
36
134
36
134
42
137
36
136
36
134
36
134
39
139
60
137
12.5
kHz
36
132
36
131
36
131
42
137
36
132
36
131
36
131
39
136
60
134
Linear operating ranges with the SA 22 windscreen
See Chapter C.1.2.
RMS detector
• Digital “True RMS“ with Peak detection,
• Resolution 0.1 dB
• Range 327.7 dB
• Crest Factor unlimited (for signals in 20 kHz band).
Overload detector
The instrument has the built-in overload detectors. The overload in the measurement channel (in its analogue
part) and the overload of the analogue / digital converter are both detected. The “overload” indication is when
the input signal amplitude is 0.5 dB above the declared “Peak measurement range”.
Underrange detector
The instrument has the built-in underrange detector. The “underrange” indication appears when the minimum
value of the RMS detector output goes below the specified lower linear operating range.