Base Software; Standards Met; Correction Filters - Larson Davis SoundAdvisor 831C Reference Manual

A.3 Base Software
A.3.1 Standards Met
Sound Level Standards:
• IEC 61672-1:2013 Class 1, Group X
• IEC 60651 Ed 1.2 (2001) plus Amendment 1
(1993-02) and Amendment 2 (2000-10) Type
1, Group X
• IEC 60804 (2000-10) Type 1, Group X
• ANSI S1.4-2014 Class 1
• ANSI S1.4-1983 (R2006) plus Amendment
ANSI S1.4A-1985 (R2006) Type 1
• ANSI S1.43-1997 (R2007) Type 1
• DIN 45657 Sound level meters - Additional
requirements for special measuring tasks
Table A.7 SLM with PRM831 and 377B02 Microphone
Frequency
Hz
31.5
63
125
250
500
1000
2000
4000
8000
12500
16000
1.
1. Add numbers in this column to levels read on the SLM to correct to the 0° Free Field level at frequency.
2, From B&K 4226 Calibrator
3. From B&K UA033 EA
4. Corrections at 95% confidence
EA - Electrostatic Actuator
WS - windscreen
Note: Data was taken at reference conditions 23° C, 50% RH, 101.3 kPa
SoundAdvisor Model 831C
0° Free Field
0° Free Field
Corrections with
1,2
Corrections
WS
dB re 1 kHz dB re 1 kHz
0.23 0.12
0.18 0.07
0.09 -0.02
0.10 -0.01
0.25 0.17
0.00 0.00
0.43 0.69
0.97 0.94
2.60 2.25
5.65 5.33
7.69 6.92
A.3.2 Correction Filters
• Frequency response correction filters are
available for sound field/microphone type
and
accessories.
• Note: "RI" indicates "Random Incidence"
and "FF" indicates "Free-Field"
• For microphone 377B20: RI to FF
• For microphone 377B02: FF to RI
• For microphone 377B02 with EPS2106/8: FF
to RI, FF to FF, FF:90°
• For microphone 377B02 with EPS2116: FF
to RI, FF to FF, FF:90°
0° Free Field
1,3
Corrections
1,2
dB re 1 kHz
0.21
0.15
0.10
0.07
0.26
0.00
0.42
0.97
3.02
6.51
8.46
for environmental
0° Free Field Expanded
Corrections with uncertainty of
1,3
WS Corrections
dB re 1 kHz
0.10
0.04
-0.01
-0.03
0.18
0.00
0.69
0.95
2.67
6.19
7.68
protection
1,4
dB
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.35
0.50
0.50
A-10