Larson Davis 831 - Page 464

Model 831 Manual 1/1 and 1/3 Octave Filters A-27
1/3 Octave Filter Summation Error
The Octave Filter Summation Error shown in the following graphs is defined by IEC61260 4.9.
FIGURE A-8 Gain = 0 dB, Filter Range = Normal
FIGURE A-9 Gain = 0 dB, Filter Range = Low
1/3 Octave Filter Sum m ation
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
6.31 15.25 36.87 89.13 215.4 520.8 1259 3043 7356 17783
Frequency
Error (dB)
1/3 Octave Filter Sum m ation
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
6.31 15.11 36.17 86.6 207.3 496.4 1189 2846 6813 16312
Frequency
Error (dB)