Larson Davis SoundAdvisor 831C Reference Manual page 191

Table B.2 Directional Response of 3 ½-inch Windscreen
-0.37
9440.61
-0.13
10000.00
-0.20
10592.54
-0.47
11220.18
-0.67
11885.02
-0.57
12589.25
-0.70
13335.21
-0.40
14125.38
-0.70
14962.36
-0.90
15848.93
-0.90
16788.04
-0.87
17782.79
-0.90
18836.49
-1.27
19952.62
1. The corrections which should be subtracted from the measured data when using the Larson-Davis Model
½
WS001 3 -inch diameter windscreen with a
ing table
FIGURE B-1
Windscreen Direction
EPS2116 Corrections
The following table and graph display correction factors for effects of the EPS2116 on the response of the sound
level meter. These are corrections are intended for laboratory use when testing to IEC 61672-3 to account for effects
of the EPS2116. See Table B.3 for the appropriate filter selection in the sound level meter for a given test as well as
the associated correction factor to be applied. Note that the correction factors are tabulated in Table B.4.
Table B.3 Test, Filter, and Correction Correlation
Test
Free Field Response
90 Degree Response
SoundAdvisor Model 831C
-0.40 -0.37 -0.50 -0.67
-0.20 -0.27 -0.43 -0.57
-0.20 -0.17 -0.40 -0.47
-0.43 -0.37 -0.43 -0.53
-0.73 -0.63 -0.60 -0.73
-0.73 -0.83 -0.87 -0.97
-0.67 -0.63 -0.83 -1.00
-0.50 -0.57 -0.60 -0.90
-0.73 -0.53 -0.73 -0.97
-0.90 -0.97 -1.03 -1.27
-1.07 -1.00 -1.30 -1.33
-0.93 -0.93 -1.10 -1.33
-1.10 -0.90 -1.10 -1.43
-1.30 -1.13 -1.47 -1.73
Sound Level Meter Filter
FF:FF 2116
FF:90 2116
-0.70 -0.70 -0.83
-0.57 -0.77 -0.83
-0.47 -0.70 -0.83
-0.47 -0.70 -0.90
-0.57 -0.83 -0.90
-0.97 -1.00 -1.00
-1.17 -1.10 -1.07
-1.00 -1.00 -1.20
-0.90 -1.10 -1.33
-1.13 -1.30 -1.60
-1.47 -1.50 -1.53
-1.53 -1.70 -1.57
-1.43 -1.70 -1.83
-1.67 -2.07 -2.30
½
-inch Larson-Davis microphone are as indicated in the follow-
Free Field to Free Field EPS2116
Free Field to 90 Degree EPS2116
-0.77 -0.90 -0.93
-0.77 -0.90 -0.97
-0.83 -0.83 -0.97
-0.77 -0.80 -0.77
-0.83 -0.87 -0.73
-1.00 -1.17 -1.07
-1.07 -1.37 -1.53
-1.17 -1.37 -1.63
-1.23 -1.50 -1.53
-1.37 -1.57 -1.37
-1.40 -1.70 -1.77
-1.67 -1.73 -2.30
-1.80 -1.83 -2.13
-1.97 -2.23 -2.13
EPS 2116 Correction
(See Table A.2)
Correction Factor
Correction Factor
-0.77 -0.60
-0.90 -0.70
-0.87 -0.70
-0.90 -0.67
-0.70 -0.70
-0.90 -0.90
-1.20 -1.13
-1.47 -1.20
-1.43 -1.13
-1.40 -1.17
-1.43 -1.43
-2.00 -1.70
-2.27 -1.77
-1.97 -1.67
B-5