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ASA S12.42 2010

$79.63

ANSI/ASA S12.42-2010 American National Standard Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures

Published By Publication Date Number of Pages
ASA 2010 66
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PDF Catalog

PDF Pages PDF Title
13 1 Scope
2 Normative references
14 3 Terms and definitions
16 4 Applicability of the test methods
17 5 Requirements for product samples and band force
5.1 Required number of HPD samples
18 5.2 Measurement of band force
5.3 Devices with adjustable band force
6 Acoustic test fixture(s) – continuous and impulsive noise methods
6.1 Introduction
19 6.2 Critical dimensions
6.3 Self insertion loss
6.4 Microphone and preamplifier requirements
20 6.5 Earcanal couplers
6.6 Earcanal extension
6.7 Flesh simulation
7 Continuous noise methods – MIRE test subjects
7.1 Anatomical features
7.2 Otoscopic inspection
21 7.3 Measurement of head dimensions
7.4 Gender balance
7.5 Eyeglasses and jewelry
7.6 Number of subjects
7.7 Subjects for MIRE tests of ANR devices
8 Continuous noise methods – facilities and instrumentation (MIRE and ATF
8.1 Test signals
22 8.2 Sound field characteristics
23 8.3 Fitting noise
8.4 Head position reference device
8.5 Observation of subjects
24 8.6 Instrumentation
8.7 Microphones – MIRE method
25 9 Continuous noise methods – test procedures and data reduction (MIRE and ATF
9.1 Introduction
26 9.2 Verification of test spectrum and signal level
27 9.3 Fitting of HPDs
28 9.4 Measurement of insertion loss
30 9.5 Number and sequence of measurements
34 9.6 Data analysis
36 9.7 Uncertainty for continuous noise methods
9.8 Information to be included in the test report
37 9.9 Graphical presentation of the data
ii © 2010 Acoustical Society of America – All rights reserved
10 Impulsive noise methods – facilities and instrumentation (ATF
10.1 Impulse characteristics
38 10.2 Instrumentation
10.3 Free-field pressure probe / microphone
39 10.4 Positioning of the ATF and free-field pressure probe
40 11 Impulsive noise methods – test procedures and data reduction (ATF
11.1 Introduction
11.2 Measurement of time waveforms
41 11.3 Computation of the peak insertion loss
42 11.4 Uncertainty for impulsive noise method
43 11.5 Information to be included in the test report
44 Annex A (normative) Procedure for measurement of the band force of semi-insert devices
46 Annex B (informative) Acoustic Test Fixtures (ATF) – general information
48 Annex C (normative) Procedure for measuring head dimensions
49 Annex D (informative) Methods for mounting MIRE microphones in the ear
51 Annex E (normative) Procedure for MIRE AIL measurement of ANR deep-insert custom-molded
earplugs
52 Annex F (informative) Uncertainty for continuous noise methods
F.1 MIRE uncertainty
53 F.2 ATF uncertainty
55 Annex G (informative) Procedure for generation of impulsive noise
G.1 Introduction
G.2 Shock tube
56 G.3 Explosive discharge
58 Annex H (informative) Example MATLAB® code for computing impulsive peak insertion loss
62 Annex I (informative) Uncertainty for impulsive noise method
64 Bibliography
ASA S12.42 2010
$79.63