CISPR 16-1:1999/AMD2:2003

INTERNATIONAL
CISPR
ELECTROTECHNICAL
16-1
COMMISSION
AMENDMENT 2
2003-04
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Amendment 2
Specification for radio disturbance and
immunity measuring apparatus and methods –
Part 1:
Radio disturbance and immunity
measuring apparatus
Amendement 2
Spécifications des méthodes et des appareils
de mesure des perturbations radioélectriques et
de l'immunité aux perturbations radioélectriques –
Partie 1:
Appareils de mesure des perturbations
radioélectriques et de l'immunité aux
perturbations radioélectriques

 IEC 2003 Droits de reproduction réservés  Copyright - all rights reserved
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U
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Международная Электротехническая Комиссия
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For price, see current catalogue

– 2 – CISPR 16-1 Amend. 2  IEC:2003(E)

FOREWORD
This amendment has been prepared by CISPR subcommittee A: Radio-interference

measurements and statistical methods.

The text of this amendment is based on the following documents:

FDIS Report on voting
CISPR/A/434/FDIS CISPR/A/441/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 the base publication and its amendments will
remain unchanged until 2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

Page 3
CONTENTS
Replace, on page 5, the existing title of Annex Q by the following new title:
Annex Q (normative) Example and measurement of the parameters of an asymmetric artificial
network (AAN)
Add, on page 5, the titles of Annex Y and Annex Z as follows:
Annex Y (normative) Performance check of the exceptions from the definitions of a click
according to 4.2.3 of CISPR 14-1
Annex Z (normative) Example and measurement of the parameters of the AN for coaxial and
other screened cables
Page 15
2 Normative references
Insert, in the existing list, the title of the following standard:
CISPR 14-1:2000, Electromagnetic compatibility – Requirements for household appliances,
electric tools and similar apparatus – Part 1: Emission

CISPR 16-1 Amend. 2  IEC:2003(E) – 3 –

Page 17
3 Definitions
Add, on page 23, the following definitions:

3.20
asymmetric artificial network (AAN)
network used to measure (or inject) asymmetric (common mode) voltages on unshielded
symmetric signal (e.g. telecommunication) lines while rejecting the symmetric (differential

mode) signal
NOTE The term “Y-network” is a synonym for AAN.
3.21
impedance stabilization network (ISN)
generally an artificial network that provides a stabilized impedance to the EUT; often (e.g. in
CISPR 22) used as a synonym for AAN
3.22
coupling/decoupling network (CDN)
artificial network for the measurement or injection of signals on one circuit while preventing
signals from being measured or injected on another circuit
3.23
longitudinal conversion loss (LCL)
in a one- or two-port network, a measure (a ratio expressed in dB) of the degree of unwanted
transverse (symmetric mode) signal produced at the terminals of the network due to the
presence of a longitudinal (asymmetric mode) signal on the connecting leads
1)
(definition from ITU-T Recommendation O.9 )
Page 65
5.4 Disturbance analyzers
Replace the existing text of 5.4 and its subclauses by the following:
Disturbance analyzers are used for the automatic assessment of amplitude, rate and duration
of discontinuous disturbances (clicks).

A ‘click’ has the following characteristics:
a) the QP amplitude exceeds the quasi-peak limit of continuous disturbance,
b) the duration is not longer than 200 ms,
c) and the spacing from a preceding or subsequent disturbance is equal to or more than
200 ms.
A series of short pulses shall be treated as a click when its duration, measured from
the start of the first to the end of the last pulse, is not longer than 200 ms and conditions a)
and c) are fulfilled.
The time parameters are determined from the signal which exceeds the IF reference level of
the measuring receiver.
___________
)
ITU-T Recommendation O.9, Measuring arrangements to assess the degree of unbalance about earth.

– 4 – CISPR 16-1 Amend. 2  IEC:2003(E)

NOTE 1 Definition and assessment of clicks are in compliance with CISPR 14-1:2000.

NOTE 2 Current analyzers are designed to be used with a quasi-peak measuring receiver of the type which works

with a limited internal signal level. As a result, such analyzers may not interface correctly with all receivers.

5.4.1 Fundamental characteristics

a) The analyzer shall be equipped with a channel to measure the duration and spacing of

discontinuous disturbances; the input of this channel shall be connected to the IF output

of the measuring receiver. For these measurements, only the part of the disturbance has to
be considered which exceeds the IF reference level of the receiver. The accuracy of
duration measurements shall be not worse than ±5 %.

NOTE 1 The IF reference level is the corresponding value in the IF output of the measuring receiver to an
unmodulated sinusoidal signal, which produces a quasi-peak indication equal to the limit for continuous
disturbances.
b) The analyzer shall be equipped with a channel to assess the quasi-peak amplitude of a
disturbance.
c) The amplitude in the quasi-peak channel shall be measured 250 ms after the last falling
edge in the IF channel.
d) The combination of both channels shall comply in all respects with the requirements of 4.1.
e) The analyzer shall be capable of indicating the following information:
– the number of clicks of duration equal to or less than 200 ms;
– the duration of the test in minutes;
– the click rate;
– the incidence of disturbances other than clicks which exceed the QP limit of continuous
disturbance.
NOTE 2 An example of a disturbance analyzer is shown in form of a block diagram in Figure 11.
f) For validation of the fundamental characteristics the analyzer has to pass the performance
check with all the wave forms (test pulses) in Table 13.
Figure 12 presents in a graphical form the waveforms listed in Table 13.
Figure Y.1 presents in a graphical form all the waveforms listed in Table Y.1 for the
performance check of the exceptions from the definitions of a click according to 4.2.3
of CISPR 14-1.
CISPR 16-1 Amend. 2  IEC:2003(E) – 5 –

Table 13 – Disturbance analyzer performance test –
Test signals used for the check against the definition of a click

Test signal parameters
12 3 4 5
QP amplitude of Duration
f
impulses adjusted of impulses
individually adjusted in the Graphical presentation of

Separation
relative to QP intermediate the test signal measured

of impulses
reference frequency output in the IF-output and
Evaluation by
or periodicity
the associated QP signal
indication of the of the
the analyzer
(IF-output)
measurement measurement relative to the reference

receiver receiver indication of the measurement
ms
receiver
dB ms
Pulse 1 Pulse 2 Pulse 1 Pulse 2
1 1 0,11 1 click
0 100 200 300 400 500 600 700 800 900 100
1 s
a
2 1 9,5 1 click
0 04 08 12 16 2 22
2,2 s
a
3 1 190 1 click
0 04 08 12 16 2 22
2,2 s
b
4 1 1 333 Other than click
0 02 04 06 08 1 12 14 16 18 2
2 s
Test No.
– 6 – CISPR 16-1 Amend. 2  IEC:2003(E)

Table 13 (continued)
Test signal parameters
12 3 4 5
QP amplitude of Duration
f
impulses adjusted of impulses
individually adjusted in the Graphical presentation of
Separation
the test signal measured
relative to QP intermediate
of impulses
reference frequency output in the IF-output and
Evaluation by
or periodicity
the associated QP signal
indication of the of the
the analyzer
(IF-output)
measurement measurement relative to the reference

receiver receiver indication of the measurement
ms
receiver
dB ms
Pulse 1 Pulse 2 Pulse 1 Pulse 2
5 1 210 Other than click
(210 ms)
0 100 200 300 400 500 600 700 800 900 1000
1 s
6 5 5 30 30 180 Other than click
(240 ms)
0 100 200 300 400 500 600 700 800 900 1000
1 s
7 5 5 30 30 130 1 click
0 100 200 300 400 500 600 700 800 900 10
1 s
8 5 5 30 30 210 2 clicks
0 100 200 300 400 500 600 700 800 900 1000
1 s
Test No.
CISPR 16-1 Amend. 2  IEC:2003(E) – 7 –

Table 13 (continued)
Test signal parameters
12 3 4 5
QP amplitude of Duration
f
impulses adjusted of impulses
individually adjusted in the Graphical presentation of

Separation
the test signal measured
relative to QP intermediate
of impulses
reference frequency output in the IF-output and
Evaluation by
or periodicity
indication of the of the the associated QP signal
the analyzer
(IF-output)
measurement measurement relative to the reference

receiver receiver indication of the measurement
ms
receiver
dB ms
Pulse 1 Pulse 2 Pulse 1 Pulse 2
9 1 0,11 Periodicity 10, Other than click
min. 21 pulses
0 100 200 300 400 500 600 700 800 900 100
1 s
10 –2,5 25 30 30 265 1 click
0 100 200 300 400 500 600 700 800 900 1000
1s
c e d
11 25 –2,5 190 30 1 034 2 clicks

0 02 04 06 08 1 12 14 16 18 2
2 s
c e
12 25 –2,5 190 30 1 166 1 click
0 02 04 06 08 1 12 14 16 18 2
2 s
Test No.
– 8 – CISPR 16-1 Amend. 2  IEC:2003(E)

Table 13 (continued)
a
To be performed with background noise consisting of 200 Hz CISPR pulses at a level 2,5 dB below the quasi-
peak threshold level. These pulses should be present commencing at least 1 s before the test pulse and lasting

until at least 1 s after the test pulse.

Observations:
1) The graphical representation is done with peak measurements of a very short hold time (<1 ms) of the test

receiver which show the 200-Hz pulse. When the pulse-modulated sine wave arrives, the 200-Hz-pulse is no
longer visible (as seen in the graph for test no. 3) but still present during the event of the click disturbance

2) The very narrow responses at the origin in the graphs are due to a firmware imperfection.

b
The 1,333 s impulse checks the threshold of the analyzer for impulses, which are only 1 dB above the quasi-

peak threshold level.
c
These lower levels shall be set such that the intermediate frequency threshold is exceeded but the quasi-peak
threshold is not exceeded
d
If these two pulses were to be measured as separate disturbances, only one click would be registered.
e
The correspondent values for the frequency range above 30 MHz are under consideration and will be revised
after further investigations.
f
The rise times of the pulses shall not be longer than 40 μs.

CISPR 16-1 Amend. 2  IEC:2003(E) – 9 –

Evaluation by
Test
Test signal
the analyzer
No.
0,11ms/1 dB 1 click
9,5 ms/1 dB
+1 s
−1 s
1 click
Background: noise or CISPR pulses, 200 Hz: −2,5 dB (QP)

190 ms/1 dB
−1 s +1 s
1 click
Background: noise or CISPR pulses, 200 Hz: –2,5 dB (QP)
Other than click
1 333 ms/1 dB
210 ms/1 dB
Other than click
30 ms/5 dB      30 ms/5 dB
Other than click
6 180 ms
30 ms/5 dB     30 ms/5 dB
130 ms
1 click
30 ms/5 dB        30 ms/5 dB
210 ms
8 2 clicks
Other than click
Min. 21 pulses/0,11 ms/periodicity 10 ms/1 dB
30 ms/25 dB
1 click
265 ms
30 ms/−2,5 dB
190 ms/25 dB
Band B: 1034 ms/Band C: under consideration
2 clicks
190 ms/25 dB
30 ms/−2,5 dB/2 dB IF
Band B: 1 166 ms/Band C: under consideration
1 click
30 ms/–2,5 dB/2 dB IF
IEC  1115/03
Figure 12 – A graphical presentation of test signals used in the test of the analyzer for
the performance check against the definition of a click according to Table 13

– 10 – CISPR 16-1 Amend. 2  IEC:2003(E)

5.4.2 Test method for the validation of the performance check for the click analyzer

5.4.2.1 Basic requirements
The disturbance analyzer is connected to the quasi-peak measuring receiver and tuned to a

convenient frequency.
A CW signal and a pulsed CW signal both at the tuned frequency of the receiver are required.

A signal generated by CISPR pulse generator, as defined in Annex B, with a 200 Hz PRF

covering the receiver bandwidth at the tuned frequency is also required for tests No. 2 and 3.

The pulsed CW signal source shall provide two independently variable pulses. The rise time of
the pulses shall be not longer than 40 μs. The pulse duration shall be variable between 110 μs
and 1,3 s and the amplitudes variable over a 44 dB range. Any background noise of the pulsed
CW signal source shall be at least 20 dB below the reference level used in step a) in the test
measured on the receiver’s quasi-peak meter.
The test procedure is as follows:
a) The CW signal is connected to the input of the measuring receiver used in conjunction
with the disturbance analyzer. The amplitude of the CW signal is adjusted to bring the
meter indication to the reference (zero) point on the meter scale of the measuring receiver
equal to a value identical to the QP-limit for continuous disturbance. The receiver RF
sensitivity (attenuator) control is adjusted to a level above the receiver noise but below the
limit for continuous disturbance used as threshold in the IF channel. The corresponding
level of the CW signal at the IF output of the receiver constitutes the IF reference level.
b) The pulsed CW signal is connected to the input of the measuring receiver. For test number
2 and 3 the signal from the CISPR pulse generator is added to the pulsed CW signal. The
parameters of the signal are given in Table 13. The amplitudes of the pulses shown in
column 1 of Table 13 are adjusted individually relative to the indication of the limit (QP) for
continuous disturbance used as threshold in the IF channel. The levels shall be relative
to the respective RF and IF reference levels established in the previous paragraph.
5.4.2.2 Additional requirements
The test method is identical to the one described in 5.4.2.1.
The parameters of the signal are given in Table Y.1.
Page 73
5.5.3.2 Magnetic antenna
Add, after the existing paragraph, the following new paragraph:
Tuned electrically balanced loop antennas may be used to make measurements at lower field
strengths than untuned electrically-screened loop an
...