EN 50289-1-11:2016
(Main)Communication cables - Specifications for test methods - Part 1-11: Electrical test methods - Characteristic impedance, input impedance, return loss
Communication cables - Specifications for test methods - Part 1-11: Electrical test methods - Characteristic impedance, input impedance, return loss
This Part of EN 50289 details the test methods to determine characteristic impedance, input impedance and return loss of cables used in analogue and digital communication systems. It is to be read in conjunction with EN 50289-1-1, which contains essential provisions for its application.
Kommunikationskabel - Spezifikationen für Prüfverfahren - Teil 1-11: Elektrische Prüfverfahren - Wellenwiderstand, Eingangsimpedanz, Rückflussdämpfung
Dieser Teil EN 50289 beschreibt die Prüfverfahren zur Bestimmung des Wellenwiderstandes, der Eingangsimpedanz und der Rückflussdämpfung von fertiggestellten Kabeln, welche in analogen und digitalen Kommunikationssystemen eingesetzt werden. Dieser Teil ist in Verbindung mit der EN 50289 1 1 zu lesen, in dem grundlegende Festlegungen zur Anwendung dieser Norm getroffen sind.
Câbles de communication - Spécifications des méthodes d'essai - Partie 1-11: Méthodes d'essais électriques - Impédance caractéristique, impédance d'entrée, affaiblissement de réflexion
Komunikacijski kabli - Specifikacije za preskusne metode - 1-11. del: Električne preskusne metode - Karakteristična impedanca, vhodna impedanca, povratne izgube
Ta del standarda EN 50289 podrobno navaja preskusne metode za ugotavljanje karakteristične impedance, vhodne impedance in povratne izgube kablov, ki se uporabljajo v analognih in digitalnih komunikacijskih sistemih.
Ta del standarda je treba brati v povezavi s standardom EN 50289-1-1, ki vključuje bistvene določbe za njegovo uporabo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2017
1DGRPHãþD
SIST EN 50289-1-11:2002
.RPXQLNDFLMVNLNDEOL6SHFLILNDFLMH]DSUHVNXVQHPHWRGHGHO (OHNWULþQH
SUHVNXVQHPHWRGH.DUDNWHULVWLþQDLPSHGDQFDYKRGQDLPSHGDQFDSRYUDWQH
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Communication cables - Specifications for test methods - Part 1-11: Electrical test
methods - Characteristic impedance, input impedance, return loss
Kommunikationskabel - Spezifikationen für Prüfverfahren - Teil 1-11: Elektrische
Prüfverfahren - Wellenwiderstand, Eingangsimpedanz, Rückflußdämpfung
Câbles de communication - Spécifications des méthodes d'essai - Partie 1-11: Méthodes
d'essais électriques - Impédance caractéristique, impédance d'entrée, affaiblissement de
réflexion
Ta slovenski standard je istoveten z: EN 50289-1-11:2016
ICS:
33.120.20 äLFHLQVLPHWULþQLNDEOL Wires and symmetrical
cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 50289-1-11
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2016
ICS 33.120.20 Supersedes EN 50289-1-11:2001
English Version
Communication cables - Specifications for test methods - Part
1-11: Electrical test methods - Characteristic impedance, input
impedance, return loss
Câbles de communication - Spécifications des méthodes Kommunikationskabel - Spezifikationen für Prüfverfahren -
d'essai - Partie 1-11: Méthodes d'essais électriques - Teil 1-11: Elektrische Prüfverfahren - Wellenwiderstand,
Impédance caractéristique, impédance d'entrée, Eingangsimpedanz, Rückflußdämpfung
affaiblissement de réflexion
This European Standard was approved by CENELEC on 2016-09-05. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any
alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50289-1-11:2016 E
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test method for mean characteristic impedance (S type measurement) . 10
4.1 Principle . 10
4.2 Expression of test results . 10
5 Test method for input impedance and return loss (S type measurement) . 10
5.1 Method A: measurement of balanced cables using balun setup . 10
5.1.1 Test Equipment . 10
5.1.2 Test sample . 11
5.1.3 Calibration procedure . 11
5.1.4 Measuring procedure . 12
5.2 Method B: measurement of balanced cables using balun-less setup . 12
5.2.1 Test Equipment . 12
5.2.2 Test sample . 13
5.2.3 Calibration procedure . 13
5.2.4 Measuring procedure . 13
5.3 Method C: measurement of coaxial cables . 14
5.3.1 Test Equipment . 14
5.3.2 Test sample . 14
5.3.3 Calibration procedure . 14
5.3.4 Measuring procedure . 15
5.4 Expression of test results . 15
6 Test report . 17
Annex A (normative) Function fitting of input impedance . 18
A.1 General . 18
A.2 Polynomial function for function fitting of input impedance . 18
A.3 Fewer terms . 19
Annex B (normative) Correction procedures for the measurement results of return loss and
input impedance . 21
B.1 General . 21
B.2 Parasitic inductance corrected return loss (PRL) . 21
B.3 Gated return loss (GRL) . 23
B.4 Fitted return loss (FRL) . 25
B.5 Comparison of gated return loss (GRL) with fitted return loss (FRL) . 31
B.6 Influence of the correction technique on return loss peaks . 32
Annex C (normative) Termination loads for termination of conductor pairs . 35
C.1 General . 35
C.2 Verification of termination loads. 36
Bibliography . 37
European foreword
This document [EN 50289-1-11:2016] has been prepared by CLC/TC 46X "Communication cables".
The following dates are fixed:
• latest date by which this document has to be (dop) 2017-09-05
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2019-09-05
conflicting with this document have to
be withdrawn
This document supersedes EN 50289-1-11:2001.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
1 Scope
This part of EN 50289 details the test methods to determine characteristic impedance, input impedance and
return loss of cables used in analogue and digital communication systems.
It is to be read in conjunction with EN 50289-1-1, which contains essential provisions for its application.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 50289-1-1:2001, Communication cables - Specifications for test methods - Part 1-1: Electrical test
methods - General requirements
EN 50289-1-5:2001, Communication cables - Specifications for test methods - Part 1-5: Electrical test
methods - Capacitance
EN 50289-1-7:2001, Communication cables - Specifications for test methods - Part 1-7: Electrical test
methods - Velocity of propagation
EN 50290-1-2, Communication cables - Part 1-2: Definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50290-1-2 and the following apply.
3.1
characteristic impedance
Z
C
(wave) impedance at the input of a homogeneous line of infinite length. The characteristic impedance Z of a
c
cable is defined as the quotient of a voltage and current wave which are propagating in the same direction,
either forwards or backwards.
uu
fr
(1)
Z
C
ii
fr
where
Z is characteristic impedance;
c
u is voltage wave propagating in forward respectively reverse direction;
f,r
i is current wave propagating in forward respectively reverse direction.
f,r
= =
3.2
mean characteristic impedance
Z
cm
in practice for real cables which always have structural variations the characteristic impedance is described
by the mean characteristic impedance which is derived from the measurement of the velocity of propagation
(EN 50289-1-7) and the mutual capacitance (EN 50289-1-5). However, this method is only applicable for
frequencies above 1 MHz and non-polar insulation materials (i.e. materials having a dielectric permittivity
which doesn’t change over frequency). The mean characteristic impedance approaches at sufficiently high
frequencies (≈100 MHz) an asymptotic value Z
∞
The characteristic impedance may be expressed as the propagation coefficient divided by the shunt
admittance. This relationship holds at any frequency.
aβ+ j β a
(2)
Zj≈−
c
jCω 1− j tanδωC ωC
( )
where
is complex characteristic impedance (Ω);
Z
c
α is attenuation coefficient (Np/m) ;
β is phase constant (rad/m);
tanδ is loss factor;
ω -1
is circular frequency (s );
C is mutual capacitance (F/m).
At high frequencies, where the imaginary component of impedance is small, and the real component and
magnitude are substantially the same we get for the mean characteristic impedance
τ
β 1
p
(3)
Z ≈==
cm
ω ××C C vC
Where
Z is mean characteristic impedance (m);
cm
v is velocity of propagation (m/s);
τ is phase delay (s/m);
p
C is mutual capacitance (F/m).
3.3
terminated input impedance
Z
in
impedance measured at the near end (input) when the far end is terminated by a load resistance of value
equal to the system nominal impedance Z
R
=
3.4
open/short input impedance
Z
OS
impedance measured at the near end (input) when the far end is terminated with its own impedance. In
practice this is the case when the round trip attenuation is greater than 40 dB at any measured frequency.
This property takes into account structural variations in the cable. For samples with lower round trip loss it is
determined by the open/short circuit method:
Z ZZ× (4)
os open short
where
is input Impedance of the cable obtained from an open/short measurement;
Z
os
Z is impedance with an open circuit at the far end of the cable;
open
Z is impedance with a short circuit at the far end of the cable.
short
3.5
fitted characteristic impedance
Z
fit
is obtained from a least square error function fitting of the open/short input impedance. The fitting can be
applied on the magnitude, real and imaginary part of the input impedance. The fitted characteristic
impedance is an alternative to the mean characteristic impedance to describe the characteristic impedance. It
is only valid if the variations with frequency of the input impedance around its characteristic impedance are
balanced.
3.6
(operational) return loss
RL
(operational) return loss is measured at the near end (input) when the far end is terminated by a load
resistance
...
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