{"id":415681,"date":"2024-10-20T06:06:34","date_gmt":"2024-10-20T06:06:34","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-60318-82022-2\/"},"modified":"2024-10-26T11:21:29","modified_gmt":"2024-10-26T11:21:29","slug":"bs-en-iec-60318-82022-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-60318-82022-2\/","title":{"rendered":"BS EN IEC 60318-8:2022"},"content":{"rendered":"

IEC 60318-8:2022 describes an acoustic coupler for loading a hearing aid or insert earphone with a specified acoustic impedance when testing its acoustic performance, in the frequency range up to 16 kHz. It is suitable for air-conduction hearing aids and earphones, coupled to the ear by means of ear inserts, earmoulds or similar devices. The acoustic coupler does not simulate the human ear. However, it has an effective volume of only 0,4 cm3<\/sup>, which is small enough not to produce significant resonances in the coupler in the frequency range below 16 kHz. Therefore, it will load the earphone with a known acoustic impedance, which allows repeatable measurements with low uncertainty to be obtained on earphones used in extended high-frequency audiometry.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nundefined <\/td>\n<\/tr>\n
4<\/td>\nEuropean foreword
Endorsement notice <\/td>\n<\/tr>\n
5<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
7<\/td>\nFOREWORD <\/td>\n<\/tr>\n
9<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
10<\/td>\n1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions <\/td>\n<\/tr>\n
11<\/td>\n3.2 Abbreviated terms
4 Mechanical design of the 0,4 cm3 coupler
4.1 General
4.1.1 Overall design guidelines <\/td>\n<\/tr>\n
12<\/td>\n4.1.2 Acceptance limits
4.2 Cavity dimensions
4.2.1 Critical dimensions
4.2.2 Effective coupler volume and cavity dimensions
4.3 Verification procedure of the effective coupler volume
4.4 Microphone
4.4.1 General
4.4.2 Microphone type <\/td>\n<\/tr>\n
13<\/td>\n4.5 Static pressure equalisation vent
4.6 Acoustic transfer impedance level
5 Calibration
5.1 Reference environmental conditions
5.2 Method of calibration
Tables
Table 1 \u2013 The acoustic transfer impedance level modulus and the associated acceptance intervals <\/td>\n<\/tr>\n
14<\/td>\n6 Coupling of receivers and hearing aids to the coupler
6.1 Coupling to a hearing aid receiver by means of tubing
6.2 Coupling to a hearing aid embedded in or connected to an earmould
Figures
Figure 1 \u2013 Coupling to a hearing aid receiver by means of coupling tubing <\/td>\n<\/tr>\n
15<\/td>\n6.3 Coupling to a receiver in the canal (RIC)
Figure 2 \u2013 Coupling to an ITE, ITC, or CIC <\/td>\n<\/tr>\n
16<\/td>\n6.4 Coupling to a BTE hearing aid with 2 mm continuous internal diameter tubing
Figure 3 \u2013 Coupling to a receiver in the canal (RIC) <\/td>\n<\/tr>\n
17<\/td>\n6.5 Coupling to a BTE hearing aid with earmould simulator
Figure 4 \u2013 Coupling to a BTE hearing aid with 2 mmcontinuous internal diameter coupling tubing <\/td>\n<\/tr>\n
18<\/td>\n6.6 Coupling to a BTE hearing aid with thin acoustic coupling tubing
Figure 5 \u2013 Coupling to a BTE hearing aid with earmould simulator <\/td>\n<\/tr>\n
19<\/td>\n7 Maximum permitted expanded uncertainty for coupler conformance testing
Figure 6 \u2013 Coupling to a BTE hearing aid with thin coupling tubing <\/td>\n<\/tr>\n
20<\/td>\nFigure 7 \u2013 Relationship between tolerance interval, corresponding acceptanceinterval and the maximum permitted uncertainty of measurement
Table 2 \u2013 Values of Umax for measurements <\/td>\n<\/tr>\n
21<\/td>\nAnnex A (informative)Example of a method for verification of the effective volume of the coupler
A.1 Method for verification of the effective volume of the coupler <\/td>\n<\/tr>\n
22<\/td>\nA.2 Measurement uncertainty
Figure A.1 \u2013 Measurement setup for coupler volume measurement
Table A.1 \u2013 Typical components of measurement uncertaintyin the measurement of effective volume <\/td>\n<\/tr>\n
23<\/td>\nAnnex B (informative)Example of a method for the measurement of the acoustictransfer impedance of the 0,4 cm3 coupler
B.1 Measurement procedure
B.1.1 Acoustic transfer impedance <\/td>\n<\/tr>\n
24<\/td>\nB.1.2 Setup for measuring the coupler acoustic transfer impedance <\/td>\n<\/tr>\n
25<\/td>\nB.2 Typical coupler acoustic transfer impedance
Figure B.1 \u2013 Test set-up for measuring the coupler acoustic transfer impedance
Figure B.2 \u2013 Typical coupler acoustic transfer impedance <\/td>\n<\/tr>\n
26<\/td>\nFigure B.3 \u2013 Typical acoustic transfer impedance times frequency
Table B.1 \u2013 Typical acoustic transfer impedance values <\/td>\n<\/tr>\n
27<\/td>\nB.3 Measurement uncertainty
Table B.2 \u2013 Typical components of measurement uncertaintyin the measurement of acoustic transfer impedance <\/td>\n<\/tr>\n
28<\/td>\nAnnex C (informative)Example of one specific design of the coupler
Figure C.1 \u2013 Example of a specific design of the 0,4 cm3 coupler, shown with removable coupling plate with a nipple for the attachment of coupling tubing <\/td>\n<\/tr>\n
29<\/td>\nAnnex D (informative)Electrical analogue representation of the coupler as a tube model
Figure D.1 \u2013 Electrical analogue of the coupler as a lossytransmission line tube with lossy terminations <\/td>\n<\/tr>\n
31<\/td>\nTable D.1 \u2013 List of constants <\/td>\n<\/tr>\n
32<\/td>\nFigure D.2 \u2013 Transfer impedance model vs. measurements
Figure D.3 \u2013 Equivalent volume calculated from the model vs. measurements <\/td>\n<\/tr>\n
33<\/td>\nFigure D.4 \u2013 Model predictions of coupler impedance <\/td>\n<\/tr>\n
34<\/td>\nAnnex E (informative)Example assessments of conformance to specifications of this document
E.1 General
E.2 Conformance criteria
E.3 Example test results <\/td>\n<\/tr>\n
35<\/td>\nTable E.1 \u2013 Examples of assessment of conformance <\/td>\n<\/tr>\n
36<\/td>\nFigure E.1 \u2013 Examples of assessment of conformance <\/td>\n<\/tr>\n
37<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Electroacoustics. Simulators of human head and ear – Acoustic coupler for high-frequency measurements of hearing aids and earphones coupled to the ear by means of ear inserts<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2022<\/td>\n38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":415689,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[270,2641],"product_tag":[],"class_list":{"0":"post-415681","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-140-50","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/415681","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/415689"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=415681"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=415681"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=415681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}