Larson Davis SoundAdvisor 831C Reference Manual page 162

Cont...Octave Band Analysis 1/3 Octave Linearity Range
0 dB
Gain (dB)
2500 ≥ 110
30 to 140
3150 ≥ 109
31 to 140
4000 ≥ 108
32 to 140
5000 ≥ 107
34 to 140
6300 ≥ 106
35 to 140
8000 ≥ 105
36 to 140
10000 ≥ 104
37 to 140
12500 ≥ 103
38 to 140
16000 ≥ 101
39 to 140
20000 ≥ 100
40 to 140
FIGURE A-2
Self-generated noise levels for 1/1 octave filters with PRM831
50.0
40.0
30.0
20.0
10.0
0.0
-10.0
-20.0
-30.0
1
SoundAdvisor Model 831C
+20 dB 0 dB +20 dB
Gain (dB) Gain (µdB) Gain (dB)
≥ 108 ≥ 100
12 to 120 10 to 110 6 to 90
≥ 107 ≥ 99
13 to 120 11 to 110 6 to 90
≥ 106 ≥ 98
14 to 120 12 to 110 7 to 90
≥ 105 ≥ 97
15 to 120 13 to 110 8 to 90
≥ 104 ≥ 96
16 to 120 14 to 110 9 to 90
≥ 103 ≥ 95
17 to 120 15 to 110 9 to 90
≥ 102 ≥ 94
18 to 120 16 to 110 10 to 90
≥ 101 ≥ 93
19 to 120 17 to 110 11 to 90
≥ 100 ≥ 92
20 to 120 18 to 110 12 to 90
≥ 99 ≥ 91
21 to 120 19 to 110 13 to 90
PRM831 1/1 OBA Noise Floor
10 100
Gain (dB)
≥ 84 2500
31 to 140
≥ 84 3150
32 to 140
≥ 83 4000
33 to 140
≥ 82 5000
34 to 140
≥ 82 6300
35 to 140
≥ 81 8000
36 to 140
≥ 80 10000
36 to 140
≥ 79 12500
37 to 140
≥ 78 16000
39 to 140
≥ 77 20000
40 to 140
1000
0 dB
0 dB +20 dB
Gain
Gain (µdB)
(µdB)
≥ 110 ≥ 109 ≥ 101
11 to 120 9 to 110
≥ 109 ≥ 108 ≥ 100
12 to 120 10 to 110
≥ 108 ≥ 107 ≥ 99
13 to 120 11 to 110
≥ 107 ≥ 106 ≥ 98
14 to 120 12 to 110
≥ 106 ≥ 105 ≥ 97
15 to 120 13 to 110
≥ 105 ≥ 104 ≥ 96
16 to 120 14 to 110
≥ 104 ≥ 103 ≥ 95
17 to 120 15 to 110
≥ 103 ≥ 102 ≥ 94
87 to 120 16 to 110
≥ 101 ≥ 101 ≥ 93
19 to 120 17 to 110
≥ 100 ≥ 100 ≥ 92
20 to 120 18 to 110
High +0dB
High +20dB
Normal +0dB
Normal +20dB
10000
+20 dB
Gain
(µdB)
≥ 89
1 to 90
≥ 89
2 to 90
≥ 88
3 to 90
≥ 87
4 to 90
≥ 86
5 to 90
≥ 85
5 to 90
≥ 84
6 to 90
≥ 83
7 to 90
≥ 82
9 to 90
≥ 81
10 to 90
A-16