A-48 Frequency Response Model 831 Manual
Noise Levels
The noise of the Model 831 includes contributions from the following components:
• Instrument and preamplifier
• Microphone
Noise Level as a Function of 1/3 Octave Frequency Bands
In the following sections, the noise levels for each component, and the total, are presented as a
function of 1/3 octave frequency bands.
.
FIGURE A-27 Noise of Model 831 with 377B02: 0 dB Gain, Low Range
Typical Noise of Model 831 with 377B02 Microphone, 0 dB Gain, Low Range
-10
-8
-6
-4
-2
0
2
4
6
8
10
8.0
10.0
12.5
16.0
20.0
25.0
31.5
40.0
50.0
63.0
80.0
100
125
160
200
250
315
400
500
630
800
1000
1250
1600
2000
2500
3150
4000
5000
6300
8000
10000
12500
16000
20000
Frequency (Hz)
Noise (dB SPL)
Electronic Noise
Total Noise
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