Amendment 1 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-5: Uncertainties, statistics and limit modelling - Conditions for the use of alternative test methods

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Publication Date
20-Jul-2014
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PPUB - Publication issued
Start Date
21-Jul-2014
Completion Date
21-Jul-2014
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CISPR TR 16-4-5:2006/AMD1:2014 - Amendment 1 - Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-5: Uncertainties, statistics and limit modelling - Conditions for the use of alternative test methods
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CISPR TR 16-4-5
Edition 1.0 2014-07
TECHNICAL
REPORT
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
AMENDMENT 1
Specification for radio disturbance and immunity measuring apparatus and
methods –
Part 4-5: Uncertainties, statistics and limit modelling – Conditions for the use
of alternative test methods
CISPR TR 16-4-5:2006-10/AMD1:2014-07(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
CISPR TR 16-4-5
Edition 1.0 2014-07
TECHNICAL
REPORT
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
AMENDMENT 1
Specification for radio disturbance and immunity measuring apparatus and
methods –
Part 4-5: Uncertainties, statistics and limit modelling – Conditions for the use
of alternative test methods
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
ICS 33.100.10; 33.100.20 ISBN 978-2-8322-1753-5

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – CISPR TR 16-4-5:2006/AMD1:2014
© IEC 2014
FOREWORD
This amendment has been prepared by subcommittee CISPR A: Radio-interference

measurements and statistical methods, of IEC technical committee CISPR: International

special committee on radio interference.
The text of this amendment is based on the following documents:
DTR Report on voting
CISPR/A/1050/DTR CISPR/A/1069/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 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.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
_____________
2 Normative references

Replace, in the existing reference to IEC 60050-161, "IEC 60050-161" by "IEC 60050-

161:1990".
Delete the existing publication date from reference CISPR 16-4-1.
3.1
established test method
Replace the existing note in this definition by the following new note:

NOTE The following test methods have been considered to be established test methods in CISPR:

---------------------- Page: 4 ----------------------
CISPR TR 16-4-5:2006/AMD1:2014 – 3 –
© IEC 2014

– conducted disturbance measurements at mains ports using an AMN in the frequency range 9 kHz to 30 MHz;

this method is defined in CISPR 16-2-1;

– radiated disturbance measurements in the frequency range 30 MHz to 1 GHz at 10 m distance on an OATS or

in a SAC; this method is defined in CISPR 16-2-3;

– radiated disturbance measurements in the frequency range 1 GHz to 18 GHz at 3 m distance on an FSOATS;

this method is defined in CISPR 16-2-3.
3.8
intrinsic uncertainty of the measurand
Delete, in the existing source of this definition, the words “, definition 3.6”.

Add, after the existing definition 3.9, the following new term and definition as follows:

3.10
standards compliance uncertainty
SCU

parameter, associated with the result of a compliance measurement as described in a

standard, that characterizes the dispersion of the values that could reasonably be attributed

to the measurand
[IEC 60050-161:1990, 311-01-02, modified, deletion of the notes]
4 Symbols and abbreviated terms

Replace, in the existing symbol “i”, the text by “index number of an individual EUT”.

Add, to the existing list, the following new symbols and abbreviated terms:
j index number of an individual test lab
f index number of an individual measured frequency
T number of test labs
F number of measured frequencies in the considered frequency range
RRT round robin test
OATS open-area test site
SAC semi-anechoic chamber
---------------------- Page: 5 ----------------------
– 4 – CISPR TR 16-4-5:2006/AMD1:2014
© IEC 2014
Table 2 – Overview of quantities and defining equations for conversion process
Add, at the bottom of the existing table, the following new lines.

U standards compliance uncertainty for the test method X, where X is either “E” for (26)

SC,XTM
established test method or “A” for alternative test method
D (20), (21)
deviation of the single calculated conversion factor K (f, j ) from the average
conversion factor K( f )
D (24), (25)
deviation of the single measured value from the average for the
M (f, j )
XTM
XTM,i
measured values M
XTM,i
M measured value depending on EUT, lab, and frequency (18), (23)
XTM,i(f,j)
Add, after the existing 6.10, the following new clause:
7 Measurement-based procedure to derive limits for an alternative test method
based on measurement results
7.1 General

As presented in Clause 6, the conversion factor K of alternative disturbance measurement

methods is based on the concept of the availability of models of the measurement methods

under consideration, the considered EUTs, and the application of an independent reference

quantity X. In this way, the inherent uncertainties of the two methods under comparison are

determined, and these uncertainties plus the intrinsic uncertainties of the measurand and the

measurement instrumentation uncertainties (MIUs) are taken into account in determining the

limit for the ATM [see Equations (7), (9) and (16)].

Because the independent reference quantity is not always available, the conversion factor

K can be estimated by direct comparison of the measurement results [see Equation (14)].

The uncertainty of each measurement procedures is estimated by the standards compliance

uncertainty (SCU). The uncertainty of the conversion factor is determined by the SCUs of the

ETM and ATM, as well as by the different characteristics of the EUTs. The limit L is

ATM

determined according to Equation (15) using the conversion factorK . The limit L takes

ATM,U

into account the difference between the SCUs of the ATM and ETM, as well as the uncertainty

caused by the different characteristics of the EUTs.

The condition for the estimation of the conversion factor by measurements is that at least five

independent sets of data for each EUT are obtained through a round robin test (RRT), and N

representative EUTs are used for the RRT. To assure statistical independence of the sets of

data, the RRT involves at least five test houses. For simplicity, it is assumed here that each

set of data is provided by a different test house. Outliers are identified and removed from the

sets of data if no correction is possible.

7.2 Application of practical measurement results to determine the conversion factors

7.2.1 The conversion factor

The conversion factor K in the considered frequency range can be calculated for each of the

F measured frequencies, for each of the N EUTs and for each of T labs.
(18)
K ( f ,j )=M ( f ,j )−M ( f ,j ) in dB
i ATM,i ETM,i
The average conversion factor K (f ) is calculated using Equation (19).
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CISPR TR 16-4-5:2006/AMD1:2014 – 5 –
© IEC 2014
N T
in dB
K (f )= K (f ,j ) (19)
i=1j=1

The uncertainty of the average conversion factor K (f )can be estimated by the deviation

of each calculated conversion factor from the average conversion
D (f ,j ) K( f ,j )
K,i i
factorK (f ) and the standard deviation s of D (f ,j ).
K K,i
in dB (20)
D (f ,j )=K (f )−K (f ,j )
K,i i
The experimental standard deviation can be calculated by
N T F
s = [D −D (f ,j )] in dB
(21)
K K K,i
∑∑∑
(NTF )−1
i=1j=1f=1
where D is the average of all D (f ,j ) .
K K,i
The resulting expanded uncertainty U of the conversion factor is
in dB
U = 2s (22)
K K
7.2.2 Estimation of SCU by measurement

For the estimation of the SCU, the average for the measured values of all T test labs for each

EUT i is calculated using Equation (23).
M (f )= M (f ,j ) in dB
(23)
XTM,i ∑ XTM,i
j=1
where XTM is either ETM or ATM.
For each frequency f and for each EUT i, the deviation between the measured
D (f ,j )
XTM,i
values’ average and each measured value is calculated using
M (f ) M (f ,j )
XTM,i XTM,i
Equation (24).
D (f ,j )=M (f )−M (f ,j ) in dB (24)
XTM,i XTM,i XTM,i

The experimental standard deviation of all these deviations D (f ,j ) can be calculated by

XTM,i
N T F
s= [D (f )−D (f ,j )] in dB
(25)
XTM XTM,i
∑∑∑
(NTF )−1
i=1j=1f=1
where D (f ) is the average of all D (f ,j ) .
XTM XTM,i

The uncertainty that causes this deviation depends on the measurement equipment and the

measurement procedure. This uncertainty is the SCU, and it is estimated by
---------------------- Page: 7 ----------------------
– 6 – CISPR TR 16-4-5:2006/AMD1:2014
© IEC 2014
U = 2s in dB
(26)
SC,XTM
7.2.3 Applying the conversion factor

The limit of an established test method can be converted into limit conditions for an

alternative test method using the average conversion factor [see Equation (15)] and the

measurement uncertainties of ETM and ATM [see Equations (16) and (17)].

Equations (16) and (17) take into account the instrumentation uncertainty. The inherent and

intrinsic uncertainty of the measurand is considered by using a reference quantity X in

estimating the conversion factorK (f ). If K (f ) is estimated by measuring the influence of all

uncertainties, then the instrumentation uncertainty, the uncertainty of the measurement

procedure, and the uncertainty caused by the different radiation characteristics of the EUTs

are all taken into account. Therefore the difference Δ of the uncertainties of the ATM and

meas
ETM is:
Δ =U −U in dB
(27)
meas ATM SC,ETM

For the estimation of the uncertainty U [see Equation (32)], the uncertainty of the

ATM

conversion factor U is investigated. The amount of the uncertainty of the conversion

factor can be estimated by:
2 2 2 2
U =U +U +U
(28)
K SC,ETM SC,ATM EUT
where
is the SCU of the ETM,
SC,ETM
is the SCU of the ATM, and
SC,ATM
is the uncertainty that is caused by the different radiation characteristics of
EUT
the EUTs, which is estimated by Equations (29) to (31).

The different characteristics cause a unique conversion factor for each EUT. The difference

between the conversion factors is estimated by the deviation D between the average

K,EUT
conversion factor K (f ) and the average conversion factor for each EUTK (f ) .
D (f )=K (f )−K (f ) (29)
K,EUT i
D has standard deviation
K,EUT
N F
(30)
s = [D −D (f )]
EUT ∑∑ K,i K,EUT
(NF )−1
i=1f=1
where D is the average of all D (f ) .
K,i K,EUT
The uncertainty U is estimated by
EUT
U = 2s in dB.
(31)
EUT EUT
---------------------- Page: 8 ----------------------
CISPR TR 16-4-5:2006/AMD1:2014 – 7 –
© IEC 2014
The uncertainty U is determined by the uncertainty U of the ATM and the
ATM SC,ATM
uncertainty U caused by the EUTs. Therefore U can be estimated by
EUT ATM
2 2
(32)
U = U +U .
ATM EUT SC,ATM
Therefore, using Equation (27) the application of Equation (17) becomes
L =L −Δ if Δ > 0, and
ATM,U ATM meas meas
(33)
(34)
L =L if Δ ≤ 0
ATM,U ATM meas
It should be considered that U in Equation (27) is estimated in accordance with
SC,ETM

CISPR 16-4-1, which estimates generally the U for 3 m test site results in the frequency

range 30 MHz to 300 MHz to be 15,5 dB; for the conditions of the RRT and the terminated

cables, U may be reduced to 11 dB. CISPR 16-4-1 gives no value for the U of the 10

SC SC,ETM

m test site results, but the value can be expected to be in the order of about 10 dB.

B.1.1.5 Estimate the standard uncertainties of the test methods (see 6.6)

Replace, in the existing text for intrinsic uncertainty, "CISPR 16-4-1:2003" by "CISPR 16-4-1".

B.2.1.5 Estimate the standard uncertainties of the test methods (see 6.6)

Replace, in the existing text for intrinsic uncertainty, "CISPR 16-4-1 ed.1.1" by

"CISPR 16-4-1".
Add, at the end of the existing B.3, the fol
...

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