SoundAdvisor Model 831C
A-17
A.4 Octave Band Analysis Software – Option 831C-OB3
Complies with the following 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
OBA Specifications
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 Specifications
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 as shown
.
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
Summary of Contents for 831C-FFT
Page 1: ...Larson Davis SoundAdvisor Model 831C Sound Level Meter Reference Manual...
Page 214: ...SoundAdvisor Model 831C A 50 FIGURE A 47 Model 831C with 377C20 Microphone...
Page 215: ...SoundAdvisor Model 831C A 51 FIGURE A 48 Model 831C with 377C20 Microphone...
Page 216: ...SoundAdvisor Model 831C A 52 FIGURE A 49 Model 831C with 377C20 Microphone...
Page 223: ...SoundAdvisor Model 831C A 59 A 10 Declaration of Conformity...