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BS EN IEC 60268-3:2018 – TC:2020 Edition

BS EN IEC 60268-3:2018 – TC:2020 Edition

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Tracked Changes. Sound system equipment – Amplifiers

Published By Publication Date Number of Pages
BSI 2020 144
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IEC 60268-3:2018 is available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60268-3:2018 applies to analogue amplifiers, and the analogue parts of analogue/digital amplifiers, which form part of a sound system for professional or household applications. It specifies the characteristics that should be included in specifications of amplifiers and the corresponding methods of measurement. This part of IEC 60268 shall be used in conjunction with IEC 60268-1:1985 and IEC 60268 2:1987. This fifth edition cancels and replaces the fourth edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) rated condition of digital input is newly specified; b) tolerance of rated power supply is changed; c) maximum effective output power is appended to output characteristics list; d) ‘Terms, definitions and rated values’ clause is complemented.

PDF Catalog

PDF Pages PDF Title
78 undefined
82 CONTENTS
85 FOREWORD
87 1 Scope
2 Normative references
88 3 Terms, definitions and rated values
3.1 Terms and definitions
89 3.2 Rated values
4 Conditions
4.1 Rated conditions and standard measuring conditions
4.1.1 Overview
90 4.1.2 Rated conditions
91 4.1.3 Standard measuring conditions
4.2 Other conditions
5 Classes of operation
6 Interchangeable parts
7 Automatic controls
92 8 Power supply
9 Position of the volume controls
10 Pre-conditioning for measurements
11 Series of measurements
93 12 Variable consumption apparatus
13 Marking
14 Operating environment
94 15 Characteristics to be specified, and their methods of measurement
15.1 Power supply characteristics
15.1.1 Characteristics to be specified
15.1.2 Method of measurement
15.2 Tolerance of (long-term) power supply voltage variations
15.2.1 Characteristic to be specified
95 15.2.2 Methods of measurement
96 15.3 Tolerance of power supply frequency variations
15.3.1 Characteristics to be specified
15.3.2 Methods of measurement
15.4 Tolerance of power supply harmonics and ripple
15.4.1 Characteristics to be specified
97 15.4.2 Methods of measurement
15.5 Input characteristics
15.5.1 Rated source impedance, characteristic to be specified
15.5.2 Input impedance
99 15.5.3 Rated source e.m.f., characteristic to be specified
15.5.4 Minimum source e.m.f. for rated distortion-limited output voltage
15.6 Output characteristics
15.6.1 Rated load impedance, characteristic to be specified
100 15.6.2 Output source impedance
101 15.6.3 Output voltage and power (distortion-limited)
102 15.6.4 Maximum effective output power (distortion-limited at 10 %)
103 15.6.5 Regulation
104 15.6.6 Overload restoring time
15.7 Limiting characteristics
15.7.1 Overload source e.m.f.
105 15.7.2 Short-term maximum output voltage and power
15.7.3 Long-term maximum output voltage and power
106 15.7.4 Temperature-limited output power
107 15.8 Characteristics of protection circuits
15.8.1 General
108 15.8.2 Protection against potentially damaging combinations of output voltageand current
109 15.8.3 Characteristics of d.c. offset protection circuits
110 15.9 Sustaining-time for rated (distortion-limited) output voltage or power
15.9.1 General
Tables
Table 1 – Different rated total harmonic distortion and rated distortion-limitedoutput power specifications for the same amplifier
111 15.9.2 Characteristic to be specified
15.9.3 Method of measurement
15.10 Gain
15.10.1 Voltage gain and e.m.f. gain
112 15.10.2 Maximum e.m.f. gain
15.10.3 Attenuation characteristic of the volume control
113 15.10.4 Attenuation characteristic of balance controls for multi-channel equipment
15.11 Response
15.11.1 Gain-frequency response
114 15.11.2 Gain-limited effective frequency range
15.11.3 Distortion-limited effective frequency range
15.11.4 Phase-frequency response
115 15.12 Amplitude non-linearity
15.12.1 General
15.12.2 Rated total harmonic distortion, characteristic to be specified
15.12.3 Total harmonic distortion under standard measuring conditions
116 15.12.4 Total harmonic distortion as a function of amplitude and frequency
15.12.5 Harmonic distortion of the nth order under standard measuring conditions
117 15.12.6 Harmonic distortion of the nth order as a function of amplitude and frequency
118 15.12.7 Modulation distortion of the nth order (where n = 2 or n = 3)
120 15.12.8 Difference-frequency distortion of the nth order (where n = 2 or n = 3)
121 15.12.9 Dynamic intermodulation distortion (DIM)
Table 2 – Distortion components due to dynamic intermodulation distortion fallingin the frequency range up to 20 kHz
123 15.12.10 Total difference frequency distortion
124 15.12.11 Weighted total harmonic distortion
125 15.13 Noise
15.13.1 Characteristic to be specified
15.13.2 Method of measurement
126 15.14 Hum
15.14.1 General
15.14.2 Characteristics to be specified
15.14.3 Method of measurement
127 15.15 Balanced inputs and outputs
15.15.1 Balance of the input
128 15.15.2 Overload (distortion-limited) peak-to-peak common-mode input voltage
129 15.15.3 Balance of the output
130 15.16 Cross-talk and separation in multi-channel amplifiers
15.16.1 Characteristics to be specified
15.16.2 Method of measurement
131 15.17 Gain and phase differences between channels in multi-channel amplifiers
15.17.1 Gain difference
132 15.17.2 Phase difference
15.18 Dimensions and mass, characteristics to be specified
133 Figures
Figure 1 – Example block diagram for multi-channel amplifier
Figure 2 – Connection diagram of equipment for digital input
134 Figure 3 – Arrangements for the Class D amplifier
Figure 4 – Arrangements for measuring input impedance
135 Figure 5 – Oscillogram when measuring overload restoring time
136 Figure 6 – Protection against potentially damaging combinationsof output voltage and current
137 Figure 7 – Arrangement for combining two input signals
Figure 8 – Frequency spectrum below 30 kHz of the signal formeasuring dynamic intermodulation distortion
138 Figure 9 – Arrangement for measuring the balance of a balanced input
Figure 10 – Arrangement for measuring the internalimpedance balance of a balanced output
Figure 11 – Arrangement for measuring the voltage symmetry of a balanced output
139 Annex A (informative)Balanced interfaces
140 Annex B (informative)Specification of a multi-channel amplifier
B.1 General
B.2 Example specification of a 5.1 channel amplifier
B.3 Example specification of a 5 channel amplifier
Figure B.1 – Block diagram for a 5.1 channel surround amplifier
141 Figure B.2 – Block diagram for a 5 channel surround amplifier
142 Bibliography

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BS EN IEC 60268-3:2018 - TC
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