CISPR 16-1-1:2006/AMD2:2007

CISPR 16-1-1
Edition 2.0 2007-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
AMENDMENT 2
AMENDEMENT 2
Specification for radio disturbance and immunity measuring apparatus
and methods –
Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
Spécifications des méthodes et des appareils de mesure des perturbations
radioélectriques et de l’immunité aux perturbations radioélectriques –
Partie 1-1: Appareils de mesure des perturbations radioélectriques et de
l’immunité aux perturbations radioélectriques – Appareils de mesure

CISPR 16-1-1 A2:2007
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CISPR 16-1-1
Edition 2.0 2007-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
COMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES
AMENDMENT 2
AMENDEMENT 2
Specification for radio disturbance and immunity measuring apparatus
and methods –
Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
Spécifications des méthodes et des appareils de mesure des perturbations
radioélectriques et de l’immunité aux perturbations radioélectriques –
Partie 1-1: Appareils de mesure des perturbations radioélectriques et de
l’immunité aux perturbations radioélectriques – Appareils de mesure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
H
CODE PRIX
ICS 33.100.10 ISBN 2-8318-9219-8

– 2 – CISPR 16-1-1 Amend. 2 © IEC:2007

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/737/FDIS CISPR/A/751/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 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• withdrawn,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 3
Contents
Replace the title of Clause 7 with the following new title:
7 Measuring receivers with rms-average detector for the frequency range 9 kHz to 18 GHz
Replace the title of Annex A with the following new title:
Annex A (normative) Determination of response to repeated pulses of quasi-peak and rms-
average measuring receivers (Subclauses 3.2, 4.4.2, 7.3.2 and 7.5.2)
Add to the list of tables the titles of the new tables as follows:

Table 15 – VSWR requirements of input impedance
Table 16 – Bandwidth requirements
Table 17 – Minimum pulse repetition rate without overload
Table 18 – Relative pulse response of rms-average and quasi-peak measuring receivers
Table 19 – Pulse response of rms-average receiver
Table 20 – Maximum reading of rms-average measuring receivers for a pulse-modulated
sine-wave input in comparison with the response to a continuous sine-wave having the same
amplitude
CISPR 16-1-1 Amend. 2 © IEC:2007 – 3 –

Page 11
1 Scope
Replace, in existing item d), “r.m.s. measuring receiver” by “rms-average measuring receiver”.

Page 13
3 Terms and definitions
Add the following new definitions:
3.10
weighting (of e.g. impulsive disturbance)
the pulse-repetition-frequency (PRF) dependent conversion (mostly reduction) of a peak-
detected impulse voltage level to an indication that corresponds to the interference effect on
radio reception
– For the analogue receiver, the psychophysical annoyance of the interference is a
subjective quantity (audible or visual, usually not a certain number of misunderstandings
of a spoken text).
– For the digital receiver, the interference effect is an objective quantity that may be defined
by the critical bit error ratio (BER) (or bit error probability (BEP)) for which perfect error
correction can still occur or by another, objective and reproducible parameter.
3.10.1
weighting characteristic
the peak voltage level as a function of PRF for a constant effect on a specific
radiocommunication system, i.e., the disturbance is weighted by the radiocommunication
system itself
3.10.2
weighting function or weighting curve
the relationship between input peak voltage level and PRF for constant level indication of a
measuring receiver with a weighting detector, i.e. the curve of response of a measuring
receiver to repeated pulses
3.10.3
weighting factor
the value in dB of the weighting function relative to a reference PRF or relative to the peak
value
3.10.4
weighting detector
detector which provides an agreed weighting function
3.10.5
weighted disturbance measurement
measurement of disturbance using a weighting detector

– 4 – CISPR 16-1-1 Amend. 2 © IEC:2007

Page 55
7 Measuring receivers with rms detector for the frequency range 9 kHz to

18 GHz
Replace the existing title and text of Clause 7 with the following:

7 Measuring receivers with rms-average detector for the frequency range

9 kHz to 18 GHz
7.1 General
RMS-average weighting receivers employ a weighting detector that is a combination of the
rms detector (for pulse repetition frequencies above a corner frequency f ) and the average
c
detector (for pulse repetition frequencies below the corner frequency f ), thus achieving a
c
pulse response curve with the following characteristics: 10 dB/decade above the corner
frequency and 20 dB/decade below the corner frequency.
Spectrum analyzers that meet the requirements of this clause can be used for compliance
measurements.
7.2 Input impedance
The input circuit of measuring receivers shall be unbalanced. For receiver control settings
within the CISPR indicating range, the input impedance shall be nominally 50 Ω with a VSWR
not to exceed the values in Table 15.
Table 15 – VSWR requirements of input impedance
Frequency range RF attenuation VSWR
dB
9 kHz to 1 GHz 0 2,0 to 1
9 kHz to 1 GHz 10 1,2 to 1
1 GHz to 18 GHz 0 3,0 to 1
1 GHz to 18 GHz 10 2,0 to 1
Symmetric input impedance in the frequency range 9 kHz to 30 MHz: to permit symmetrical
measurements, a balanced input transformer is used. The preferred input impedance for the
frequency range 9 kHz to 150 kHz is 600 Ω. This symmetric input impedance may be
incorporated either in the relevant symmetrical artificial network necessary to couple to the
receiver or optionally in the measuring receiver.

7.3 Fundamental characteristics
7.3.1 Bandwidth
The bandwidths shall lie within the values of Table 16.

CISPR 16-1-1 Amend. 2 © IEC:2007 – 5 –

Table 16 – Bandwidth requirements

Frequency range Bandwidth
9 kHz to 150 kHz (band A) 200 Hz (B )
150 kHz to 30 MHz (band B) 9 kHz (B )
30 MHz to 1 000 MHz (bands C and D) 120 kHz (B )
1 GHz to 18 GHz (band E) 1 MHz (B )
imp
NOTE The chosen value in band E is defined as the impulse
bandwidth of the measuring receiver with a tolerance of ± 10 %.

7.3.2 Overload factor
Above the corner frequency f , specified below, the overload factor for circuits preceding the
c
1/2
detector at a pulse repetition rate of n Hz shall be 1,27(B /n) , with B in Hz. Below the
corner frequency the overload factor at a pulse repetition rate of n Hz shall be above the
1/2
value 1,27(B /f ) (f /n).
3 c c
NOTE 1 “Corner frequency” is the pulse repetition frequency above which the rms-average detector behaves like
an rms detector and below which the rms-average detector has the slope of a linear average detector.
The minimum pulse repetition rate without overload shall conform to the values given in
Table 17.
Table 17 – Minimum pulse repetition rate without overload
Frequency range of Corner Minimum pulse Ratio peak/rms
measuring receiver frequency f repetition rate -average indications
c
kHz Hz dB
9 kHz to 150 kHz (band A) 0,01 5 19
0,15 MHz to 30 MHz (band B) 0,01 5 35,5
30 MHz to 1 000 MHz (bands C and D) 0,1 31,6 40,6
1 GHz to 18 GHz (band E) 1 316 40

NOTE 2 With this type of detector it will not, in general, be possible to provide sufficient overload factor to
prevent non-linear operation of the instrument at very low pulse repetition rates for short pulses in bands C/D and
E (the response to a short single pulse is only theoretically defined in these bands).
NOTE 3 Annex A describes the calculation for the overload factor for the rms detector. Annex B describes the
determination of the pulse generator spectrum. Annex C describes the accurate measurement of the output levels

of nanosecond pulse generators.
NOTE 4 For band E, the test may be made with a pulse-modulated sine-wave signal, with an occupied bandwidth
of e.g. 2 MHz. Clause E.6 gives the specification of an applicable test signal.
7.4 Sine-wave voltage accuracy
The accuracy of measurement of sine-wave voltages shall be better than ± 2 dB (± 2,5 dB
above 1 GHz) when supplied with a sine-wave signal at 50 Ω resistive source impedance.

– 6 – CISPR 16-1-1 Amend. 2 © IEC:2007

7.5 Response to pulses
7.5.1 Construction details
The detector function can be represented by an rms detector that continuously determines

rms values during periods of time equal to the reciprocal of the corner frequency f . These
c
rms values are then passed through a second order low-pass filter that corresponds to the

critically damped indication that is specified for the quasi-peak detector, the time constant of

which is defined up to 1 GHz. For band E, the time constant is 100 ms. In case of variation
with time, the maximum output of the low-pass filter is the measurement result.

NOTE Annexes B, C and E (currently included in CISPR 16-1-1) describe methods for determining the output

characteristics of pulse generators for use in testing the requirements of this clause.
7.5.2 Amplitude relationship
–1/2
The response of the measuring receiver for band A to pulses of impulse area [278 (B ) ] μVs emf.
at a 50 Ω source impedance which have a uniform spectrum up to at least the highest
tuneable frequency of band A, and repeated at a frequency of 25 Hz, shall for all frequencies
of tuning, be equal to the response to an unmodulated sine-wave signal at the tuned
frequency having an emf of 2 mV (66 dB(μV)) rms. For the measuring receivers for bands B,
–1/2
C, D and E, the corresponding values are [44 (B )] μVs and 1 000 Hz. The source
impedances of the pulse generator and the signal generator shall both be the same. A
tolerance of ±1,5 dB is permitted in the sine-wave voltage levels prescribed above.
NOTE Annex A describes the calculation for the pulse response of the rms detector. At a repetition frequency of
25 Hz and 100 Hz (i.e. the quasi-peak detector reference pulse repetition frequency), respectively, the relationship
between the indications of an rms-average and a quasi-peak measuring receiver of the same bandwidth is given in
Table 18.
Table 18 – Relative pulse response of rms-average and
quasi-peak measuring receivers
Frequency range of Pulse repetition rate Ratio quasi-peak/rms
measuring receiver -average indications
Hz dB
9 kHz to 150 kHz (band A) 25 4,2
0,15 MHz to 30 MHz (band B) 100 14,3
30 MHz to 1 000 MHz (bands C and D) 100 20,1

7.5.3 Variation with repetition frequency
The response of the measuring receiver to repeated pulses shall be such that, for a constant

indication on the measuring receiver, the relationship between amplitude and repetition
frequency above the corner frequency f shall be in accordance with the following rule:
c
–1/2
– amplitude proportional to (repetition frequency) .
Below the corner frequency f the relationship shall be in accordance with the following rule:
c
–1
– amplitude proportional to (repetition frequency) .
The response curve for a particular receiver shall lie between the limits in Table 19.

CISPR 16-1-1 Amend. 2 © IEC:2007 – 7 –

Table 19 – Pulse response of rms-average receiver

Repetition Relative equivalent level of pulse in dB

frequency
Band A Band B Bands C and Band E
Hz
D
100 000 – –
(–20 ± 2,0) –20 ± 2,0
10 000 – – –10 ± 1,0 –10 ± 1,0

1 000 – 0 (ref.) 0 (ref.) 0 (ref.)

316 –
+5 ± 0,5 +5 ± 0,5 +10 ± 1,0
100 –6 ± 0,6 +10 ± 1,0 +10 ± 1,0 (+20 ± 2,0)
31,6 – +15 ± 1,5 +20 ± 2,0
25 0 (ref.) +16 ± 1,6
10 +4 ± 0,4 +20 ± 2,0
5 +9 ± 0,7 +25 ± 2,3
1 – –
NOTE 1 Values in brackets are for information only.
NOTE 2 The values at 5 Hz for bands A and B take into account the
effect of the meter time constant.

7.5.4 Response to intermittent, unsteady and drifting narrowband disturbances
The response to intermittent, unsteady and drifting narrowband disturbances shall be such
that the measurement result is equivalent to the peak reading of a meter with a time constant
of 160 ms for bands A and B and of 100 ms for bands C, D and E. This can be accomplished
by the meter simulating network (analog or digital) to which the rms values described in 7.5.1
are used as input.
It is deduced from the above requirement that an rms-average measuring receiver shall yield
the maximum reading listed in Table 9 for a radiofrequency sine-wave input signal modulated
with repeated rectangular pulses having the duration and period indicated in Table 20. A
tolerance of ± 1,0 dB is allowed for this requirement.
Table 20 – Maximum reading of rms-average measuring receivers for a
pulse-modulated sine-wave input in comparison with the response to
a continuous sine-wave having the same amplitude
Repeated rectangular Band A/B receiver Band C/D/E receiver

pulses for modulation T = 0,16 s T = 0,1 s
M M
Duration = T 0,398 (= –7,9 dB) 0,353 ( = –9,0 dB)
M
Period = 1,6 s
NOTE The value for the band A/B receiver can vary by about ± 0,5 dB
due to varying overlapping of the 160 ms pulse duration with the 100 ms
rms integration time duration.

7.6 Selectivity
The selectivity curves for the rms-average weighting receiver shall be equal to those of
Figures 2a,
...