CISPR TR 16-4-4:2007/AMD1:2017

CISPR TR 16-4-4 ®
Edition 2.0 2017-06
TECHNICAL
REPORT
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

AMENDMENT 1
Specification for radio disturbance and immunity measuring apparatus and
methods –
Part 4-4: Uncertainties, statistics and limit modelling – Statistics of complaints
and a model for the calculation of limits for the protection of radio services

CISPR TR 16-4-4:2007-07/AMD1:2017-06(en)

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CISPR TR 16-4-4 ®
Edition 2.0 2017-06
TECHNICAL
REPORT
colour
inside
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

AMENDMENT 1
Specification for radio disturbance and immunity measuring apparatus and

methods –
Part 4-4: Uncertainties, statistics and limit modelling – Statistics of complaints

and a model for the calculation of limits for the protection of radio services

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.100.10; 33.100.20 ISBN 978-2-8322-4409-8

– 2 – CISPR TR 16-4-4:2007/AMD1:2017
 IEC 2017
FOREWORD
This amendment has been prepared by subcommittee CISPR H: Limits for the protection of
radio services, 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
CIS/H/313/DTR CIS/H/319/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 website 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• withdrawn,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.
_____________
5.6.2.3 Probability factors
Number the first equation of this subclause as follows:
P = P × P × P × P × P × P × P × P × P × P (35)
1 2 3 4 5 6 7 8 9 10
Add, at the end of 5.6.4.4, the following new subclauses:
5.6.5 Rationale for determination of CISPR limits in the frequency range below 30 MHz
5.6.5.1 General
With this subclause, a method for the estimation of disturbance limits for a given type of
equipment is described. This approach can be applied for the frequency range below 30 MHz.

 IEC 2017
For radiation coupling, dependence of the permissible disturbance field strength from the
wanted signal µ , the signal-to-disturbance ratio R , and other influence factors can be
w p
estimated based on Equations (21) and (22) found in 5.5.
This model should be used by Product Committees to determine the disturbance limits
measured on a EUT in standardized test sites. This model is considered suitable for point
source magnetic field devices and not for distributed or complex systems.
to P have to be considered according to 5.6.2.3.
Ten probability or influence factors P
1 10
However, for better alignment with terminology used for statistics the ten influence factors P
to P are further treated in their mean values as µ to µ . It shall be noted that the values
10 P1 P10
for µ to µ can be used in logarithmic terms (i.e. in dB) only.
P1 P10
Taking into account Equation (22) we can write
E = µ + t σ (36)
Limit i β i
Then taking equation (21) into account, noting that t = 0,84, and the limit becomes:
β
E = µ – R + µ + µ + µ + µ + µ + µ + µ + µ + µ + µ
Limit w p P1 P2 P3 P4 P5 P6 P7 P8 P9 P10
2 2 2 2 2 2 2 2 2 2 1/2
+ t σ – t (σ + σ + σ + σ + σ + σ + σ + σ + σ + σ ) (37)
β i α P1 P2 P3 P4 P5 P6 P7 P8 P9 P10
where
E is the mean value of the permissible disturbance field strength at a specified
Limit
distance d from the disturbance source;
µ is the minimum value of the wanted field strength at the edge of the service area of
w
the radio service concerned;
R is the minimum acceptable value of the signal-to-disturbance ratio (i.e. the protection
p
ratio) at the receiver's antenna port or feeding point;
µ is the mean value of the main lobes of the magnetic dipole radiation in the direction
P1
of the victim receiver;
σ is the standard deviation of P ;
P1 1
µ is the expected mean value when the directional receiving antenna has its maximum
P2
pick-up in direction of the disturbance source;
µ is the expected mean value when the victim receiver is stationary;
P3
µ is the expected mean value when there is equipment generating a disturbing signal
P4
on a critical frequency;
µ is the expected mean margin when the relevant harmonic is below the limit value;
P5
µ is the expected mean value when the type of disturbance signal generated will
P6
produce a significant effect in the receiving system;
µ is the expected mean value when the operation of the disturbance source is
P7
coincident with the receiving system;
µ is the expected mean value when the disturbance source is located in a distance to
P8
the receiving system within which interference is likely to occur;
µ is the expected mean value when the value of radiation at the edge of service area
P9
for the protected service just meets the limit for the RF disturbance;
µ is the expected mean value when buildings provide attenuation.
P10
Equation (37) is valid for mean values of influence factors (given in dB) assuming a log-
normal distribution of their figures. Notice that the latter may not be fulfilled for each factor in

– 4 – CISPR TR 16-4-4:2007/AMD1:2017
 IEC 2017
each individual case. By inserting appropriate practical figures, Equation (37) can be used to
estimate a limit E for the permissible disturbance field strength.
Limit
NOTE Within these calculations, 20 log has been utilized for distance elements and 10 log for the others,
assuming power and not voltage.
5.6.5.2 Consideration and estimated values of µ to µ
P1 P10
5.6.5.2.1 Radiation pattern of the disturbance source (µ )
P1
5.6.5.2.1.1 Consideration of µ
P1
The horizontal plane radiation pattern on a small purely magnetic antenna is described in dB
unit by
G(φ) = G + 20 log (sin(φ)) (38)
max
Gain in dB
0°
θ θ
45° 45°
–9 –6 –3
90° 90°
dB
135° 135°
180°
IEC
Figure 8 – horizontal plane radiation pattern on a small purely magnetic antenna
In the general case the victim may be in any possible direction with equal-probability. The
mean value and standard deviation of the gain can be calculated by the following averages
over half of the circle.
π
G = Avg(G(ϕ ))≡ × G(ϕ)dϕ (39)
avg
∫
π
2 2 2
σ = Avg(G(ϕ ) )−(Avg(G(ϕ ))
G
π
(40)
2 2
= (G(ϕ )) dϕ−G
avg
∫
π
 IEC 2017
Numerical calculation of Equations (39) and (40) gives the average gain G = G – 6,0 dB
avg max
and the standard deviation σ = 7,9 dB, which lead to µ = G – G = 6 dB and σ = 7,9
G P1 max avg G
dB
5.6.5.2.1.2 Estimation for the µ
P1
µ = 6 dB, σ = 8 dB
P1 P1
5.6.5.2.2 Antenna gain of the victim to the disturbance source (µ )
P2
(the directional receiving antenna have its maximum pick-up in direction of
the disturbance source)
5.6.5.2.2.1 Consideration of µ
P2
In the frequency range below 30 MHz, a typical receiving antenna used with broadcast
receivers is a rod antenna. Other antennas are also used. These antenna gains can vary to as
much as –10 dB to 10 dB, however it can be assumed that 67 % of all antennas show a gain
of within 3 dB of an isotropic antenna.
5.6.5.2.2.2 Estimation for the possible range of µ
P2
µ = –3 dB, σ = 3 dB
P2 P2
5.6.5.2.3 Stationary receiver (µ )
P3
5.6.5.2.3.1 Consideration of µ
P3
Below 30 MHz, it is likely that the victim receiver will be stationary; hence the value should be
0 dB.
5.6.5.2.3.2 Estimation for the possible range of µ
P3
µ = 0 dB, σ = 0 dB
P3 P3
5.6.5.2.4 Equipment generating a disturbing signal at a critical frequency and
relevant harmonics (µ )
P4
5.6.5.2.4.1 Consideration of µ
P4
For the source of the magnetic disturbance from monitors and plasma TVs, the issue will
appear for the fundamental frequency and the harmonics. Assuming the fundamental
emission from the disturbance source is at 250 kHz and its harmonics will occupy
approximately in the ratio of 5:1. Based upon a variation of ±25 kHz, giving a value of 50 kHz
(7 dB).
For the source of the magnetic disturbance from induction cooking equipment, the issue will
appear from the fundamental frequency and the harmonics. Assuming the fundamental
emission from the disturbance source is at 50 kHz and its harmonics will occupy
approximately in the ratio of 2:1. Based upon a variation of ±12,5 kHz, giving a value of
25 kHz (3 dB).
NOTE 1 The values below were derived from 10 log (1/5) = –7 dB and 10 log (1/2) = –3 dB hence the mean
values 5 dB and the range of 2 dB.
NOTE 2 Other sources of disturbance may be from electrical car charging stations, phone charging systems and
these are estimated to give similar values.
We have assumed no frequency dependency relevant to the limits.

– 6 – CISPR TR 16-4-4:2007/AMD1:2017
 IEC 2017
A typical response of a source of magnetic field disturbance is present in Figure 9.
–20
–40
150 300 400 600 1 000 2 000 4 000 10 000 30 000
3 000 5 000 7 000 20 000
Frequency (kHz)
IEC
Figure 9 – typical source of magnetic field disturbance
5.6.5.2.4.2 Estimation for the possible range of µ
P4
µ = 5 dB, Range σ = 2 dB
P4 P4
5.6.5.2.5 Margin that the relevant harmonics are below the limit value (µ )
P5
5.6.5.2.5.1 Consideration of µ
P5
This value has been covered in µ .
P4
5.6.5.2.5.2 Estimation for the possible range of µ
P5
This value has been covered in µ .
P4
5.6.5.2.6 Expected mean value that the type of disturbance signal generated will
produce a significant effect in the receiving system (µ )
P6
5.6.5.2.6.1 Consideration of µ
P6
In the frequency range below 30 MHz, since the bandwidth of the unwanted signal and
bandwidth of the receiver are of similar values, µ should be set to 0 dB.
P6
For the example of plasma TVs and induction cookers in the frequency range below 30 MHz,
typically since the bandwidth of the disturbance source is greater than the bandwidth of the
receiver, µ should be set to 0 dB.
P6
NOTE AC mains cable is not an issue of interference to radio receivers at the frequency below 30 MHz because
this aspect is already covered by the conducted emission requirement defined in the standard.
5.6.5.2.6.2 Estimation for the possible range of µ
P6
µ = 0 dB, Range σ = 0 dB
P6 P6
Level (dBµA/m)
 IEC 2017
5.6.5.2.7 Expected mean value that the operation of the disturbance source is
coincident with the receiving system operation of the disturbance source
(µ )
P7
5.6.5.2.7.1 Consideration of µ
P7
In the case that a receiver is operated for 24 hours, from the typical sources in 24 hours per
day, plasma TV is 8 hours, PV Inverter 8 hours and induction cookers 2 hours operated.
NOTE The estimated values given in 5.6.6.2.7.2 were derived by 10 log (time of operation (hours) /24).
5.6.5.2.7.2 Estimation for the possible range of µ
P7
µ = 6,5 dB, Range σ = 3,5 dB
P7 P7
5.6.5.2.8 The disturbance source is located in a distance to the receiving system
within which interference is likely to occur (µ )
P8
5.6.5.2.8.1 Consideration of µ
P8
The limit of the disturbance is specified for the test site with a normative fixed measurement
distance d. In practice, the actual distance r between the disturbance source and the victim is
usually quite different when the victim is used as intended.
The normative measurement distance d is 3 m. The ratio of the two distances r and d
determines the additional attenuation.
The estimated value µ usually increases the permissible limit and has to be added on the
P8
right hand side of Equation (37).
5.6.5.2.8.2 Estimation for the possible range of µ
P8
The value of µ is calculated by:
P8
µ = x × 20 log (r / d) (41)
P8
where
r is the actual distance between source and victim;
d is the measurement distance;
x is the wave propagation coefficient, typical value to be determined based upon Annex
B.
The estimated distance has to take into account the average distance for the intended use of
the radio equipment. Inserting practical distances into Equation (41) will provide the possible
µ .
range of
P8
5.6.5.2.9 The value of radiation at the edge of service area for the protected service
(µ )
P9
5.6.5.2.9.1 Consideration of µ
P9
Due to propagation complexities related to the transmission
...