CISPR TR 16-4-6:2024

CISPR TR 16-4-6 ®
Edition 1.0 2024-10
TECHNICAL
REPORT
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

Specification for radio disturbance and immunity measuring apparatus and
methods –
Part 4-6: Uncertainties, statistics and limit modelling – Statistics on radio
frequency interference (RFI) and verification by measurements in the field
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CISPR TR 16-4-6 ®
Edition 1.0 2024-10
TECHNICAL
REPORT
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

Specification for radio disturbance and immunity measuring apparatus and

methods –
Part 4-6: Uncertainties, statistics and limit modelling – Statistics on radio

frequency interference (RFI) and verification by measurements in the field

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10; 33.100.20 ISBN 978-2-8322-9798-8

– 2 – CISPR TR 16-4-6:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 10
4 Acquisition and organization of data on RFI incidences . 10
4.1 Basic interference model and conditions for undisturbed radio reception . 10
4.2 Occurrence of interference . 11
4.3 Accumulation of statistical data on interference and preparation for reporting
to CISPR. 12
4.3.1 General . 12
4.3.2 First data set – RFI incidences not necessarily indicating insufficiencies
in CISPR standards . 12
4.3.3 Second data set – RFI incidences possibly indicating insufficiencies in
CISPR standards . 12
4.4 Accumulation of data on interference and preparation for reporting to CISPR . 13
4.4.1 General . 13
4.4.2 Data to be collected . 13
5 Root-cause-analysis of the reported RFI incidences . 14
6 Reporting. 15
6.1 General . 15
6.2 Indications on the reporting format for traditional statistics of complaints . 15
Annex A (informative) Guidance for collation of statistical data on interference
complaints and classification of interference sources . 16
A.1 General . 16
A.2 Example of how to use the XML input form . 16
Annex B (informative) Value of statistics on radio frequency interference observed in
the electromagnetic environment . 20
B.1 Background and history . 20
B.2 Towards the loss of a precious indicator: interference complaints . 20
Annex C (informative) Field strength measurements in the electromagnetic
environment . 21
C.1 General . 21
C.2 Use of measurement frequencies . 21
C.3 Measurement arrangement for field strength measurements in the local
electromagnetic environment . 21
C.4 Target levels for in-situ field strength measurements – Analysis of root
causes (a) and (c) in D.2.2 . 23
C.5 Target levels for the field strength of the wanted radio signal – Analysis of
root cause (c) in D.2.2 . 24
C.5.1 Use of national reference levels of the wanted signal field strength . 24
C.5.2 Use of target levels for the wanted signal field strength recommended
by CISPR. 24
Annex D (informative) Root-cause-analysis of the reported RFI incidences . 25
D.1 General . 25
D.2 Matrix of root causes and identification procedure . 25

D.2.1 General . 25
D.2.2 Root causes of interest in maintenance of CISPR standards and limits . 26
D.3 Accumulation of statistical data on root causes . 28
D.4 Instructions for normalization of the absolute number/frequency of observed
interference incidences/scenarios into representative relative figures . 28
Annex E (informative) Cross-reference list of CISPR TR 16-4-4 [1] and this document . 31
Bibliography . 32

Figure 1 – Basic RFI model for source without radio module . 10
Figure 2 – Basic RFI model for source with radio module . 10
Figure C.1 – Conditions for coverage planning for different modes of radio reception . 22

Table A.1 – Information on reporting party . 16
Table A.2 – Data fields of one occurrence . 16
Table C.1 – Generic target levels for evaluation/analysis of the residual risk of
occurrence of individual interference incidences . 23
Table D.1 – Matrix for root cause analysis of a detected interference scenario . 26
Table E.1 – Cross-reference list of CISPR TR 16-4-4 [1] and this document . 31

– 4 – CISPR TR 16-4-6:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATION FOR RADIO DISTURBANCE AND IMMUNITY
MEASURING APPARATUS AND METHODS –

Part 4-6: Uncertainties, statistics and limit modelling –
Statistics on radio frequency interference (RFI) and
verification by measurements in the field

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