CISPR 16-4-2:2011/AMD1:2014

Amendment 1 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-2: Uncertainties, statistics and limit modelling - Measurement instrumentation uncertainty

Amendement 1 - Spécifications des méthodes et des appareils de mesure des perturbations radioélectriques et de l'immunité aux perturbations radioélectriques - Partie 4-2: Incertitudes, statistiques et modélisation des limites - Incertitudes de mesure de l'instrumentation

General Information

• Status: Published
• Publication Date: 13-Feb-2014
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.100.10 - Emission
• ICS: 33.100.20 - Immunity
• Technical Committee: CIS/A - Radio-interference measurements and statistical methods
• Current Stage: PPUB - Publication issued
• Start Date: 15-Feb-2014
• Completion Date: 14-Feb-2014

Relations

• Amends: CISPR 16-4-2:2011 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-2: Uncertainties, statistics and limit modelling - Measurement instrumentation uncertainty
• Effective Date: 05-Sep-2023

Standards Content (Sample)

CISPR 16-4-2 ®
Edition 2.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM
AMENDMENT 1
AMENDEMENT 1
Specification for radio disturbance and immunity measuring apparatus and
methods –
Part 4-2: Uncertainties, statistics and limit modelling – Measurement
instrumentation uncertainty
Spécifications des méthodes et des appareils de mesure des perturbations
radioélectriques et de l'immunité aux perturbations radioélectriques –
Partie 4-2: Incertitudes, statistiques et modélisation des limites – Incertitudes de
mesure de l’instrumentation
CISPR 16-4-2:2011-06/AMD1:2014-02(EN-FR)

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CISPR 16-4-2 ®
Edition 2.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM

AMENDMENT 1
AMENDEMENT 1
Specification for radio disturbance and immunity measuring apparatus and

methods –
Part 4-2: Uncertainties, statistics and limit modelling – Measurement

instrumentation uncertainty
Spécifications des méthodes et des appareils de mesure des perturbations

radioélectriques et de l'immunité aux perturbations radioélectriques –

Partie 4-2: Incertitudes, statistiques et modélisation des limites – Incertitudes de

mesure de l’instrumentation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX E
ICS 33.100.10; 33.100.20 ISBN 978-2-8322-1382-7

– 2 – CISPR 16-4-2 Amend.1  IEC:2014
FOREWORD
This amendment has been prepared by subcommittee A of CISPR: Radio-interference
measurements and statistical methods.
The text of this amendment is based on the following documents:
FDIS Report on voting
CISPR/A/1049/FDIS CISPR/A/1058/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 stability 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.
_____________
3.3 Abbreviations
Add the following new abbreviation to the existing list:
CDNE coupling decoupling network for emission measurement

Table 1 – Values of U
cispr
Add, before the existing NOTE 1, the following new line:
Conducted disturbance at mains port using CDNE       (30 MHz to 300 MHz) 3,8 dB B.7

Add, after the existing 5.5.3, the following new subclause:
5.6 Conducted disturbance measurements using a CDNE (see also B.7)
5.6.1 Measurand for measurements using a CDNE
V
Asymmetric (common-mode) disturbance voltage, in dB(µV), measured on the
connection lead of the EUT through a CDNE referred to reference ground
5.6.2 Symbols of input quantities specific to CDNE measurements
Voltage division factor (VDF) of the CDNE, in dB
F
CDNE
Correction for VDF frequency interpolation error, in dB
δF
CDNE
Correction for the imperfect common mode impedance of the CDNE, in dB
δZ
CDNE
Correction for the effect of ambient disturbances, in dB
δD
amb
Correction for the effect of imperfect grounding, in dB
δV
grounding
CISPR 16-4-2 Amend.1  IEC:2014 – 3 –
Correction for the effect of the environment, in dB
δV
env
5.6.3 Input quantities to be considered for conducted disturbance measurements at a
mains port using a CDNE
– Receiver reading
– Cable attenuation between CDNE and receiver
– CDNE VDF
– CDNE VDF frequency interpolation
– CDNE impedance
– Receiver related input quantities
• Receiver sine wave voltage accuracy
• Receiver pulse amplitude response
• Receiver pulse repetition rate response
• Receiver noise floor proximity
– Mismatch effects between CDNE receiver port and receiver
– Effect of ambient disturbances
– Effect of the grounding
– Effect of the environment
A.1 General
Add, after the last paragraph of this subclause, the following new paragraph:
In the uncertainty budgets a normal distribution function is used, unless otherwise identified in
the tables.
A.2 Rationale for the estimates of input quantities common to all disturbance
measurements (“A” comments)
Replace the existing text of the item A2) by the following new text, keeping the original
NOTES 1, 2 and 3:
An estimate of the attenuation a of the connection between the receiver and the AMN, AAN,
c
CDNE, CP, CVP, VP, absorbing clamp or antenna is assumed to be available from a
calibration report, along with an expanded uncertainty and a coverage factor.
Add, after the existing B.6, the following new subclauses:
B.7 Uncertainty budget for conducted disturbance measurements at a mains
port using a CDNE
The measurand V is calculated using:
(B.6)
V =V +a +F + δZ + δV + δV + δV + δV + δF + δM + δD +
r c CDNE CDNE sw pa pr nf CDNE amb

δV + δV
grounding env
– 4 – CISPR 16-4-2 Amend.1  IEC:2014
Table B.7 − Uncertainty budget for conducted disturbance measurements
from 30 MHz to 300 MHz
b
Uncertainty of x
c u(x )
i
i i
Probability
a
Input quantity X distribution
i
dB function dB
A1)
V k = 1
Receiver reading ± 0,1 0,10
r
A2)
Attenuation: CDNE-receiver a k = 2 0,05
± 0,1
c
B20)
CDNE VDF F k = 2 0,20
± 0,4
CDNE
B21)
CDNE impedance tolerances δZ Triangular 1,01
+2,69/–2,25
CDNE
Receiver corrections:
A3)
Sine wave voltage δV ± 1,0 0,50
sw k = 2
A4)
Rectangular 0,87
δV ± 1,5
Pulse amplitude response
pa
A4)
Pulse repetition rate response δV ± 1,5 Rectangular 0,87
pr
A5)
Noise floor proximity Rectangular 0,00
δV ± 0,0
nf
A6)
CDNE VDF frequency interpolation Rectangular 0,06
δF ± 0,1
CDNE
A7)
Mismatch: CDNE-receiver δM U-shaped 0,14
+0,19/–0,20
B22)
Effect of ambient disturbances δD ± 0,0 − 0,00
amb
B23)
Grounding related factors δV ± 1,5 Triangular 0,61
groundin
g
B24)
Triangular 0,61
δV ± 1,5
Effect of the environment
env
a A1)
Superscripts (e.g. ) correspond to comments in A.2 and B.8.
b
All c = 1 (see A.1).
i
NOTE The influence of differential-mode emission from the EUT is negligible under the conditions specified in
CISPR 16-1-2 and/or CISPR 16-2-1.
Hence, expanded uncertainty U(V) = 2u (V) = 3,79 dB
c
B.8 Rationale for the estimates of input quantities specific to the
measurement method using a CDNE
B20) The uncertainty associated with the calibration of the CDNE voltage division factor.
This quantity includes the uncertainty of the internal attenuator of the CDNE.
B21)
CISPR 16-1-2 defines the common-mode impedance of the CDNE as 150 Ω with a
magnitude tolerance of +10 Ω/-20 Ω and a phase tolerance of 0° ± 25°. Taking the
extremes of all combinations of the constrained CDNE common-mode impedance and
the unconstrained EUT impedance, the estimate of the correction δZ is zero with a
CDNE
deviation of +2,69/-2,25 dB. A triangular probability distribution is assumed, because
there is only a small chance of encountering the particular combinations of CDNE
impedance and EUT impedance needed to produce those extremes.
The estimation of the uncertainty is caused by the tolerance of the common-mode (CM)
impedance. The tolerances of the differential-mode impedance and phase of the
CDNE-M2 and CDNE-M3 are not taken into account.
B22) This factor includes the uncertainty from all radiated and conducted disturbances from
the ambient and can be neglected. This can be guaranteed only if the measurement
takes place in a shielded room. Therefore the estimate of the correction δD is zero
amb
with an uncertainty of zero. If conducted disturbances are not negligible, and their
effect on the receiver reading has not been reduced adequately by appropriate

CISPR 16-4-2 Amend.1  IEC:2014 – 5 –
suppression measures, a non-zero estimate of the correction and its uncertainty should
be included.
B23) The uncertainty associated with imperfect grounding related factors is generalized with
δV . The influence is due mainly to the variation of the capacitive coupling
grounding
between the EUT and the reference ground. The influence of imperfect grounding
related factors has been estimated as a correction δV of zero and a deviation
grounding
of 1,5 dB. A triangular probability distribution is assumed, because there is only a
small chance of reaching maximum deviation.
NOTE 1 The conductive floor of a shielded room is an adequate way of implementing the reference
ground plane.
NOTE 2
...