SoundAdvisor Model 831C
A-9
A.3 Octave Band Analysis Software – Option 831C-OB3
Standards Met
Octave Filter Standards
: IEC 61260-1:2014/Part 1,
1/1 and 1/3-octave Bands, Class 1, Group X, all
filters
ANSI/ASA S1.11-2014/Part 1, 1/1 and 1/3-octave
Bands, Class 1, Group X, all filters
Bandwidth
1/1 Octave, 1/3 Octave, or simultaneous 1/1 and 1/
3 Octave
Filter Type and Sample Rate
Digital filters are sampled at a rate of 51,200
samples per second, with base 10 center
frequencies and have real-time performance for all
filters. The 0 dB gain setting and “high” OBA range
is the reference range and the reference input
signal is .5 Volt rms at 1 kHz.
1/1 Octave Center Frequencies
8 Hz to 16 kHz
1/3 Octave Center Frequencies
6.3 Hz to 20 kHz
Measurement Range
Normal (107 dB full scale) and High (140 dB full
scale). Note: These ranges assume a 50 mV/Pa
microphone is being used.
Filter Shape
1/3 octave band centered at 1 kHz. Overlaid with
the Class 1 limit curves.
FIGURE A-1
Filter Shape
-20.0
0.0
20.0
40.0
60.0
80.0
100.0
120.0
100.0
1000.0
10000.0
A
tt
enu
ation
Frequency Hz
1 kHz Filter
Lower Limit
Upper Limit
