CISPR TR 16-4-3:2004/AMD1:2006

Amendment 1 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-3: Uncertainties, statistics and limit modelling - Statistical considerations in the determination of EMC compliance of mass-produced products

General Information

• Status: Published
• Publication Date: 16-Oct-2006
• 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: 31-Oct-2006
• Completion Date: 17-Oct-2006

Relations

• Amends: CISPR TR 16-4-3:2004 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-3: Uncertainties, statistics and limit modelling - Statistical considerations in the determination of EMC compliance of mass-produced products
• Effective Date: 05-Sep-2023

Standards Content (Sample)

TECHNICAL

CISPR

REPORT

16-4-3


  2004



AMENDMENT 1

2006-10

INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
Amendment 1
Specification for radio disturbance and
immunity measuring apparatus and methods –
Part 4-3:
Uncertainties, statistics and limit modelling –
Statistical considerations in the determination
of EMC compliance of mass-produced products

© IEC 2006 Droits de reproduction réservés ⎯ Copyright - all rights reserved
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale H

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

---------------------- Page: 1 ----------------------
– 2 – TR CISPR 16-4-3 Amend. 1 © IEC:2006(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:
DTR Report on voting
CISPR/A/666/DTR CISPR/A/691/RVC

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.
_____________
Page 2
CONTENTS
Add the title of new Annex D as follows:
Annex D (informative) Estimation of the acceptance probability of a sample
Page 7
5.1.1.2 Number of sub-ranges
Replace the formula in NOTE 4, on page 8, by the following:
⎛ f ⎞
i
upp
⎜ ⎟
log
⎜ ⎟
N f
⎝ low ⎠
f = f ×10
low
Page 8
5.1.1.3 Normalization of the measured disturbance levels
Replace the existing text of the subclause by the following:
The average value and the standard deviation of the measured values in a frequency sub-
range shall be compared to the limit. Because the limit may not be constant over the frequency
sub-range, it is necessary to normalize the measured values.

---------------------- Page: 2 ----------------------
TR CISPR 16-4-3 Amend. 1 © IEC:2006(E) – 3 –
For normalization, the difference, d , between the measured level, x , and the limit level, L ,
f f f
shall be determined at the specific frequency f that has the largest difference, using Equation
(3). The difference is negative as long as the measured value is below the limit.
d = x – L (3)
f f f
where
d = the gap to the limit at the specific frequency in dB;
f
x = the measured level in dB(μV or pW or μV/m);
f
L = the limit at the specific frequency in dB(μV or pW or μV/m).
f
5.1.1.4 Tests based on the non-central t-distribution with frequency sub-ranges
After Equation (4) replace the line beginning "n = ." by the following:
"n = the number of items in the sample"
Page 30
Add, after Annex C, the following new annex:
Annex D
(informative)

Estimation of the acceptance probability of a sample
D.1 Introduction
The following considerations are intended for use by manufacturers to estimate the real
acceptance probability of a sample, i.e. the manufacturers’ risk to fail a market surveillance
test. These considerations are based on the assumption that a realistic standard deviation for
the specific type of equipment under test can be estimated based on the experience of the
manufacturer with a specific class of products. The considerations in this annex can also be
used to estimate a margin to the limit, which is needed to achieve a desired acceptance
probability. It is emphasized that the purpose of this annex is to provide tools to manufacturers
for estimation of their own risk, but without introducing additional requirements.
For both the realistic standard deviation and the target acceptance probability, exact values
can be defined only by the manufacturer. Therefore, these methods cannot be used to add an
additional margin to the limit as a Pass/Fail criterion for tests performed by organizations other
than the manufacturers.
The acceptance probability relationships provided in this document do not include
consideration of measurement uncertainties, as described in CISPR 16-4-1 and CISPR 16-4-2.
In some cases, these uncertainties can dominate interlaboratory comparisons. As such, the
acceptance probability calculations below are valid only when results differing from each other
within the measurement uncertainty of the original test are considered to be equivalent.
Figure D.1 shows the normalized (standard deviation σ = 1,0) distribution of the amplitude
density of the disturbance values for a population exactly at the
...