Soft dB Opus Suite Data Logger Module User Manual
Page 59
58
1/3 Octave Filter Linearity
The linearity of the 1/3-octave filter has been measured for both ranges (low and high). The
experimentation is done with an adaptor (ADP092) and an electric signal. The results in dB are for an
input sensitivity of 50 mV/Pa. The maximum and the minimum linear levels are measured for each
1/3 octave band along with the noise floor.
Filter Linearity (Low Range)
Frequency (Hz)
Saturation Level
(dB)
Minimum Linear
Level (dB)
Linear Dynamic
Range (dB)
Noise Floor (dB)
20
120.5
39.5
81.0
1.3
25
120.5
34.2
86.3
0.7
31.5
120.5
33.2
87.3
2.0
40
120.5
30.6
89.9
1.2
50
120.5
30.0
90.5
1.1
63
120.5
28.1
92.4
3.2
80
120.5
27.8
92.7
0.4
100
120.5
27.4
93.1
-0.4
125
120.5
27.2
93.3
1.4
160
120.5
27.0
93.5
0.0
200
120.5
26.7
93.8
0.4
250
120.5
23.4
97.1
0.7
315
120.5
24.1
96.4
1.3
400
120.5
23.5
97.0
1.8
500
120.5
23.5
97.0
2.3
630
120.5
24.0
96.5
3.2
800
120.5
24.1
96.4
3.4
1000
120.5
24.1
96.4
4.3
1250
120.5
24.5
96.0
5.2
1600
120.5
24.5
96.0
6.1
2000
120.5
24.2
96.3
7.1
2500
120.5
24.5
96.0
8.2
3150
120.5
24.6
95.9
9.2
4000
120.5
24.7
95.8
10.1
5000
120.5
25.1
95.4
11.3
6300
120.5
25.2
95.3
12.6
8000
120.5
25.8
94.7
14.0
10000
120.5
26.3
94.2
16.9