IEC 63034:2020

IEC 63034 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Microspeakers
Micro-haut-parleurs
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IEC 63034 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Microspeakers
Micro-haut-parleurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.50 ISBN 978-2-8322-8312-7

– 2 – IEC 63034:2020  IEC 2020
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 8
4 Conditions of measurement . 9
4.1 Rated measuring conditions . 9
4.2 Climatic conditions . 9
4.3 Normal measuring conditions . 9
5 Acoustical environment . 10
5.1 General . 10
5.2 Free-field conditions . 10
5.3 Half-space free-field conditions . 10
5.4 Simulated free-field conditions . 10
5.5 Half-space simulated free-field conditions . 10
6 Mounting of the microspeaker . 10
6.1 Mounting and acoustic loading of microspeaker units . 10
6.2 Mounting and acoustic loading of microspeaker systems . 11
6.3 Standard micro-baffle . 11
6.4 Measuring plane wave tube. 12
7 Positioning of microspeaker and measuring microphone . 13
7.1 Positioning of the microspeaker . 13
7.1.1 Rated geometrical condition . 13
7.1.2 Reference plane . 13
7.1.3 Reference point . 13
7.1.4 Normal vector . 13
7.1.5 Polar vector . 14
7.2 Measuring distance under free-field and half-space free-field conditions . 14
7.2.1 Far-field condition . 14
7.2.2 Single microspeaker unit (transducer) . 14
7.2.3 Multi-unit microspeaker systems . 14
7.3 Positioning of microspeaker and microphone in simulated free-field and half-
space free-field conditions . 14
8 Measuring equipment . 15
9 Accuracy of the measurement. 15
9.1 General . 15
9.2 Unwanted acoustic and electrical noise . 15
9.3 Accuracy of the mounting . 15
9.4 Accuracy of the measuring equipment . 15
9.5 Accuracy of acoustic environment . 15
10 Marking of terminals and controls . 15
10.1 General . 15
10.2 Positive terminal . 16
10.2.1 Characteristic to be specified . 16
10.2.2 Marking . 16

10.2.3 Method of testing . 16
11 Test signals . 16
11.1 General . 16
11.2 Steady-state sinusoidal signal . 16
11.3 Sinusoidal chirp signal . 16
11.4 Discrete multi-tone sinusoidal signal . 17
11.5 Broadband noise signal . 18
11.6 Narrow-band noise signal . 18
12 Preconditioning . 18
12.1 Acclimatization . 18
12.2 Pre-loading . 18
13 Electrical input impedance . 19
13.1 Electrical input impedance curve . 19
13.1.1 Characteristics to be specified . 19
13.1.2 Method of measurement . 19
13.2 Rated impedance . 19
14 Small signal parameters of the microspeaker . 19
14.1 General . 19
14.2 Characteristics to be specified . 20
14.2.1 Resonance frequency f . 20
s
14.2.2 DC resistance of driver voice coil R . 20
dc
14.2.3 Voice coil inductance L . 20
e
14.2.4 Total Q-factor Q . 20
ts
14.2.5 Electrical Q-factor Q . 20
es
14.2.6 Mechanical Q-factor Q . 20
ms
14.2.7 Mechanical compliance C . 20
ms
14.2.8 Moving mass M . 21
ms
14.2.9 Mechanical resistance R . 21
ms
14.2.10 Force factor Bl .
...