IEC 61000-3-2:2005/AMD2:2009

IEC 61000-3-2
®
Edition 3.0 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Electromagnetic compatibility (EMC) –
Part 3-2: Limits – Limits for harmonic current emissions (equipment input
current ≤16 A per phase)

Compatibilité électromagnétique (CEM) –
Partie 3-2: Limites – Limites pour les émissions de courant harmonique
(courant appelé par les appareils ≤16 A par phase)

IEC 61000-3-2:2005/A2:2009

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IEC 61000-3-2
®
Edition 3.0 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Electromagnetic compatibility (EMC) –
Part 3-2: Limits – Limits for harmonic current emissions (equipment input
current ≤16 A per phase)

Compatibilité électromagnétique (CEM) –
Partie 3-2: Limites – Limites pour les émissions de courant harmonique
(courant appelé par les appareils ≤16 A par phase)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
F
CODE PRIX
ICS 33.100.10 ISBN 978-2-88910-369-0
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 61000-3-2 Amend.2 © IEC:2009
FOREWORD
This amendment has been prepared by subcommittee 77A: Low-frequency phenomena, of
IEC technical committee 77: Electromagnetic compatibility.
The text of this amendment is based on the following documents:
FDIS Report on voting
77A/674/FDIS 77A/677/RVD

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________

2 Normative references
Delete from the existing list the following standard:
IEC 60065, Audio, video and similar electronic apparatus – Safety requirements
Add in the existing list the following new references:
IEC 60268-1:1985, Sound system equipment – Part 1: General
IEC 60268-3, Sound system equipment – Part 3: Amplifiers
3 Definitions
Delete definitions 3.5 and 3.8.
Renumber the existing definition 3.16, as follows:
3.16
total harmonic

3.16.1
total harmonic current

Add the following new term and definition:

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61000-3-2 Amend.2 © IEC:2009 – 3 –
3.16.2
total harmonic distortion
THD
ratio of the r.m.s. value of the sum of the harmonic components (in this context harmonic
current components I of orders 2 to 40) to the r.m.s. value of the fundamental component
h
2
40
⎛ I ⎞
h
THD = ⎜ ⎟

∑
⎜ ⎟
I
⎝ 1⎠
h=2

6 General requirements
Add the following text after the second paragraph, just before subclause 6.1:
A simplified test method is permitted for equipment that undergoes minor changes or updates,
provided that, in previous full compliance tests, it has been shown to have current emissions
below 60 % of the applicable limits and the THD of the supply current is less than 15 %. The
simplified test method consists of verifying that the updated equipment has an active input
power within ±20 % of that of the originally tested product, and that the THD of the supply
current is less than 15 %. Products that fulfill these requirements are deemed to comply with
the applicable limits, but in case of doubt the result of a full compliance test according to
Clauses 6 and 7 takes precedence over this simplified method.
6.2.2 Measurement procedure
Replace the whole existing text of the fifth paragraph (the ante-penultimate paragraph) by the
following new text:
In order not to use a value of power at which limits change abruptly, thus giving rise to doubt
as to which limits apply, the manufacturer may specify any value which is within ±10 % of the
actual measured value and use it for determining the limits for the original manufacturer's
conformity assessment test. The measured and specified values of power, as defined in this
clause, shall be documented in the test report.
Replace the whole existing text of the sixth paragraph (the penultimate paragraph) by the
following new text:
If the value of the power found by measurement during emission tests other than the original
manufacturer’s conformity assessment test, measured according to the terms of this clause, is
not less than 90 % nor greater than 110 % of the value for power specified by the
manufacturer in the test report (see 6.2.3.5), the specified value shall be used to establish the
limits. If the measured value is outside of this tolerance band around the specified value, the
measured power shall be used to establish the limits.
7.3 Limits for Class C equipment
a) Active input power >25 W
Add, at the end of the third dashed item:
(see the last paragraph of C.5.3).
b) Active input power ≤25 W
Replace the whole existing text of the second dashed item by the following new text:

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– 4 – 61000-3-2 Amend.2 © IEC:2009
– the third harmonic current, expressed as a percentage of the fundamental current,
shall not exceed 86 % and the fifth harmonic current shall not exceed 61 %. Also, the
waveform of the input current shall be such that it reaches the 5 % current threshold
before or at 60º, has its peak value before or at 65º and does not fall below the 5 %
current threshold before 90º, referenced to any zero crossing of the fundamental
supply voltage. The current threshold is 5 % of the highest absolute peak value that
occurs in the measurement window, and the phase angle measurements are made on
the cycle that includes this absolute peak value. See Figure 2.
Add the following new Figure 2 after Figure 1:
V
A
400 0,4
≤65°
0,3
300
I
p+
≥90°
0,2
200
≤60°
0,1
100
+0,05I
p(abs)
0
0
–0,05I
p(abs)
–100
–0,1
≤60°
–0,2
–200
≥90°
I
p–
–0,3
–300
≤65°
–400 –0,4
V A
IEC  230/09

NOTE I is the higher absolute value of I and I
p(abs) p+ p-
Figure 2 – Illustration of the relative phase angle
and current parameters described in 7.3 b)
Annex B – Requirements for measurement equipment
Delete the Note.
Annex C – Type test conditions
C.1 General
Add, at the end of the existing paragraph, the following new Note:
NOTE Product committees are invited to submit proposals for defined test conditions for specific products to IEC
SC 77A, for inclusion in this Annex.

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61000-3-2 Amend.2 © IEC:2009 – 5 –
C.3 Test conditions for audio amplifiers
Replace the whole existing clause by the following new text:
C.3.1 Conditions
Audio amplifiers which draw a supply current which varies less than 15 % of the maximum
current with input signal voltages between zero and rated source e.m.f. (as defined in
IEC 60268-3) shall be tested with no input signal.
Other audio amplifiers shall be tested under the following conditions:
• rated supply voltage;
• normal position of user controls. In particular, any controls affecting the frequency
response set to give the widest flat response achievable;
• input signals and loads as given in C.3.2.
C.3.2 Input signals and loads
The following test procedure applies.
a) Connect suitable resistors, equal to the rated load impedance(s), to each amplifier output
for supplying loudspeakers. To monitor the output voltage waveform of the audio amplifier
of a powered loudspeaker, the audio analyzer/oscilloscope is connected to internal wiring
at a point representing the electrical output of the amplifier.
NOTE 1 In the case of powered loudspeakers with internal audio amplifiers, the load is the loudspeaker and
associated crossover network.
b) Apply a sinusoidal signal at 1 kHz (see Note 2) to a suitable input. For multi-channel
amplifiers in which the surround sound channel amplifiers cannot be alternatively used as
a second set of left and right channel amplifiers, set the controls so that the surround
sound channel amplifiers are supplied with signal at a level 3 dB lower than the signal
applied to the left and right channels.
NOTE 2 For products not intended to reproduce 1 kHz signals, a frequency geometrically centred within the
reproducing bandwidth of the amplifier is applied.
c) Adjust the input signal and/or amplifier gain control(s) so as to obtain an output signal for
the left and right channels having 1 % total harmonic distortion, simultaneously. If 1 %
total harmonic distortion cannot be obtained, adjust the signal voltage and/or gain controls
to obtain the highest achievable power output at each output simultaneously. Confirm that
the output signals of the surround sound channel amplifiers are 3 dB lower than the output
signal at the outputs of the left and right channels.
d) Measure the output voltages of all channels and then readjust the input signal voltage
and/or controls to obtain voltages of 0,354 (1/√8) times the voltages obtained at the end of
step c) above.
e) In the case of products with provision for connection to external loudspeakers, proceed as
specified in 6.2.
f) For products with internal loudspeakers and without provision for connection to external
loudspeakers, note the r.m.s. output voltage of the sinusoidal signal at the output of each
amplifier. Substitute the sinusoidal signal by a pink noise signal, bandwidth-limited as
specified in 6.1 of IEC 60268-1. Confirm the r.m.s. value of the pink noise signal as it
appears at the output of each amplifier output is equal to the r.m.s. value of the sinusoidal
waveform for that channe
...