BS EN 61094-5:2016 – TC:2020 Edition
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Tracked Changes. Electroacoustics. Measurement microphones – Methods for pressure calibration of working standard microphones by comparison
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 60 |
IEC 61094-5:2016 is applicable to working standard microphones with removable protection grids meeting the requirements of IEC 61094-4 and to laboratory standard microphones meeting the requirements of IEC 61094-1. This part of IEC 61094 describes methods of determining the pressure sensitivity by comparison with either a laboratory standard microphone or another working standard microphone with known sensitivity in the respective frequency range. This edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 38 | English CONTENTS |
| 40 | FOREWORD |
| 42 | 1 Scope 2 Normative references 3 Terms and definitions |
| 43 | 4 Reference environmental conditions 5 Principles of pressure calibration by comparison 5.1 Principles 5.1.1 General principle 5.1.2 General principles using simultaneous excitation |
| 44 | 5.1.3 General principles using sequential excitation 5.2 Measuring the output voltages of the microphones 6 Factors influencing the pressure sensitivity 6.1 General 6.2 Microphone pressure equalization mechanism |
| 45 | 6.3 Polarising voltage 6.4 Reference shield configuration 6.5 Pressure distribution over the diaphragms |
| 46 | 6.6 Dependence on environmental conditions 6.7 Validation 7 Calibration uncertainty components 7.1 General 7.2 Sensitivity of the reference microphone |
| 47 | 7.3 Measurements of microphone output 7.4 Differences between the sound pressure at the test microphone and that at the reference microphone 7.5 Acoustic impedances of the microphones 7.6 Microphone separation distance 7.7 Microphone capacitance 7.8 Microphone configuration during calibration |
| 48 | 7.9 Uncertainty on pressure sensitivity level |
| 49 | Annex A (informative) Examples of couplers and jigs for simultaneous excitation A.1 A coupler for use with WS2 microphones at frequencies up to 10 kHz Figures Figure A.1 – A coupler for use with WS2 microphones |
| 50 | A.2 A jig for use with WS2 or WS3 microphones at frequencies up to 20 kHz Figure A.2 – A jig fitted with an LS2 and WS2 microphone Figure A.4 – Example arrangement of LS2 and WS3 microphones in a jig Figure A.3 – Example arrangement of LS2 and WS2 microphones in a jig |
| 51 | Tables Table A.1 – Calculated corrections to be added to the sensitivity level of the WS3 microphone when using the arrangement in Figure A.4 |
| 52 | Annex B (informative) Examples of couplers for sequential excitation B.1 A coupler for use with LS1 microphones at frequencies up to 8 kHz B.2 A coupler for use with WS2 microphones at frequencies up to 16 kHz Figure B.1 – A coupler for use with LS1 microphones |
| 53 | Figure B.2 – A coupler for use with WS2 microphones |
| 54 | Annex C (informative) Determining the open-circuit sensitivity of a measurement microphone without using the insert-voltage method |
| 55 | Annex D (informative) Typical uncertainty analysis D.1 Introduction D.2 Analysis |
| 56 | Table D.1 – Example uncertainty budget |
| 57 | D.3 Combined and expanded uncertainties |
| 58 | Bibliography |
