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 |
None
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 |