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Larson Davis SoundAdvisor 831C Reference Manual page 198

Sound level meter
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Table B.1 831C with PRM831 and 377B02 Microphone average frequency responses and
corrections Required by IEC 61672-1
9440.61
10000.00
10592.54
11220.18
11885.02
12589.25
13335.21
14125.38
14962.36
15848.93
16788.04
17782.79
18836.49
19952.62
1. Add numbers in this column to levels read on the 831 to correct the level at a specific frequency
Table B.2 Directional Response of 3 1/2" Windscreen
Frequency
(Hz)
0
0.00
251.19
0.00
266.07
0.00
281.84
0.07
298.54
0.00
316.23
0.00
334.97
0.03
354.81
0.03
375.84
0.00
398.11
0.00
421.70
0.00
446.68
0.03
473.15
0.10
501.19
0.03
530.88
0.10
562.34
0.07
595.66
0.03
630.96
SoundAdvisor Model 831C
0.01
-0.01
0.01
-0.01
0.07
-0.07
0.05
-0.05
-0.01
0.01
0.23
-0.23
0.24
-0.24
0.08
-0.08
0.05
-0.05
-0.23
0.23
-0.20
0.20
-0.15
0.15
-0.18
0.18
-0.13
0.13
Angle from Reference Direction (Degrees)
15
30
45
0.00
0.00
0.00
0.00
0.03
-0.03
0.10
0.07
-0.03
0.07
0.00
0.00
0.03
0.07
0.00
0.00
0.03
0.00
0.07
0.10
-0.03
0.07
0.03
0.00
0.00
0.10
-0.03
0.00
0.07
0.03
0.03
0.03
-0.03
0.03
0.03
0.00
0.10
0.13
0.07
0.10
0.13
0.07
0.10
0.13
0.07
0.10
0.13
0.07
0.00
0.07
-0.03
-0.03
-0.02
0.21
0.09
-0.05
-0.20
-0.21
-0.26
-0.03
-0.26
-0.02
-0.15
-0.07
-0.01
0.41
0.14
-0.06
-0.08
-0.23
-0.41
-0.59
-1.33
-1.46
60
75
90
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-0.03
-0.07
0.00
0.03
0.00
-0.03
0.00
0.03
-0.03
-0.07
-0.03
0.00
-0.03
-0.07
-0.03
0.07
-0.13
-0.07
0.00
0.00
-0.03
-0.03
-0.03
0.00
-0.03
-0.03
0.00
0.00
-0.03
-0.07
-0.03
0.00
-0.03
0.00
-0.03
0.10
0.03
0.03
-0.03
0.07
0.00
-0.03
0.07
0.00
0.00
-0.07
0.07
0.03
0.03
0.03
0.07
0.00
-0.03
-0.03
0.03
0.00
0.00
0.00
0.07
0.10
0.07
0.02
0.22
-0.22
0.16
-0.16
0.00
0.00
0.21
0.03
0.02
0.07
0.04
-0.04
0.18
-0.18
0.06
0.23
0.59
1.46
1
105
120
135
150
0.00
0.00
0.00
0.03
0.00
-0.03
0.07
0.00
-0.03
-0.03
0.03
-0.10
0.03
-0.03
-0.10
0.00
0.00
-0.07
0.03
0.03
-0.03
0.03
0.00
-0.10
0.07
-0.03
-0.07
0.03
0.00
-0.07
0.03
0.00
0.00
0.03
0.00
-0.07
0.13
0.10
-0.07
0.07
0.00
-0.03
0.13
0.10
-0.03
0.10
0.07
-0.03
0.13
0.10
0.03
0.55
0.55
0.55
0.55
0.55
0.55
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
165
180
0.00
0.00
-0.03
0.00
0.03
0.00
0.03
0.00
0.07
0.00
0.07
0.00
0.03
0.00
0.00
0.00
0.07
0.07
0.00
0.00
0.00
0.00
0.03
0.00
0.03
0.00
0.03
0.00
0.00
0.07
0.07
0.00
0.10
0.10
B-3

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