Larson Davis 831 - Page 460

Model 831 Manual 1/1 and 1/3 Octave Filters A-23
1/1 Octave Filter Linearity
The filter linearity range depends upon both the Input Gain, which is set as described in the section "20
dB Gain" on page 4-5, and the Filter Range, which is set as described in the section "OBA Range
Setting" on page 4-7.The data, which were measured using an electrical input, are in dB re. 1 V,
which is equivalent to dBSPL when a 50 mV/Pa microphone is used
Table A-20 1/1 Octave Linearity Range
1/1 Octave Filter Summation Error
The Octave Filter Summation Error shown in the following graphs is defined by IEC61260 4.9.
FIGURE A-4 Gain = 0 dB, Filter Range = Normal
Gain 0 dB 0 dB 20 dB 20 dB
Range Normal Low Normal Low
Frequency Overload
Linearity
Range
Lower
Linearity
Limit
Noise
Floor Overload
Linearity
Range
Lower
Linearity
Limit
Noise
Floor Overload
Linearity
Range
Lower
Linearity
Limit
Noise
Floor Overload
Linearity
Range
Lower
Linearity
Limit
Noise
Floor
8.0
140.8 78.9 61.9 31.9 107.5 75.5 32.0 14.1 120.7 83.7 37.0 16.2 87.4 52.4 35.0 13.7
16.0
140.8 85.8 55.0 31.9 107.5 78.7 28.8 12.8 120.7 88.7 32.0 14.7 87.4 59.4 28.0 10.0
31.5
140.8 87.8 53.0 30.4 107.5 80.5 27.0 8.8 120.7 89.7 31.0 14.3 87.4 58.4 29.0 9.0
63.0
140.8 92.8 48.0 29.5 107.5 81.5 26.0 6.2 120.7 90.7 30.0 12.9 87.4 60.4 27.0 5.8
125.0
140.8 95.8 45.0 31.1 107.5 84.5 23.0 4.4 120.7 89.7 31.0 12.6 87.4 65.4 22.0 4.1
250.0
140.8 94.8 46.0 31.1 107.5 90.5 17.0 2.2 120.7 92.7 28.0 11.2 87.4 70.4 17.0 2.8
500.0
140.8 90.8 50.0 33.5 107.5 92.5 15.0 2.1 120.7 91.7 29.0 12.1 87.4 69.4 18.0 2.0
1000.0
140.8 95.7 45.1 31.7 107.5 88.5 19.0 2.0 120.7 95.7 25.0 12.0 87.4 70.4 17.0 0.2
2000.0
140.8 92.7 48.1 33.6 107.5 92.5 15.0 2.5 120.7 95.6 25.1 13.8 87.4 75.4 12.0 -2.9
4000.0
140.8 90.8 50.0 36.7 107.5 90.5 17.0 5.1 120.7 92.6 28.1 16.7 87.4 77.4 10.0 -2.3
8000.0
140.8 88.8 52.0 40.3 107.5 87.5 20.0 8.3 120.7 87.7 33.0 20.2 87.4 75.4 12.0 -0.4
16000.0
140.8 85.8 55.0 43.6 107.5 84.5 23.0 11.5 120.7 85.7 35.0 23.5 87.4 73.4 14.0 2.0
1/1 Octave Summ ation(UURU
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
8.058 18.84 44.03 102.9 240.6 562.3 1314 3073 7182
Frequency
Summation(UURU (dB)