SIST EN 50289-1-9:2017

SLOVENSKI STANDARD
oSIST prEN 50289-1-9:2016
01-oktober-2016
.RPXQLNDFLMVNLNDEOL6SHFLILNDFLMH]DSUHVNXVQHPHWRGHGHO(OHNWULþQH
SUHVNXVQHPHWRGH1HHQDNRPHUQRVODEOMHQMHSUHþQDL]JXEDSUHWYRUEH7&/
SUHþQDL]JXEDSUHWYRUEHSUHQRVD7&7/
Communication cables - Specifications for test methods - Part 1-9: Electrical test
methods - Unbalance attenuation (transverse conversion loss TCL transverse conversion
transfer loss TCTL)
Kommunikationskabel - Spezifikationen für Prüfverfahren Teil 1-9: Elektrische
Prüfverfahren - Unsymmetriedämpfung (Unsymmetriedämpfung am nahen und am
fernen Ende)
Câbles de communication - Spécifications des méthodes d'essai Partie 1-9: Méthodes
d'essais électriques - Affaiblissement de disymétrie (perte de conversion longitudinale,
perte de transfert de conversion longitudinale)
Ta slovenski standard je istoveten z: prEN 50289-1-9:2016
ICS:
33.120.20 äLFHLQVLPHWULþQLNDEOL Wires and symmetrical
cables
oSIST prEN 50289-1-9:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50289-1-9:2016

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oSIST prEN 50289-1-9:2016

EUROPEAN STANDARD DRAFT
prEN 50289-1-9
NORME EUROPÉENNE

EUROPÄISCHE NORM

August 2016
ICS 33.120.20 Will supersede EN 50289-1-9:2001
English Version
Communication cables - Specifications for test methods - Part 1-
9: Electrical test methods - Unbalance attenuation (transverse
conversion loss TCL transverse conversion transfer loss TCTL)
Câbles de communication - Spécifications des méthodes Kommunikationskabel - Spezifikationen für Prüfverfahren
d'essai Partie 1-9: Méthodes d'essais électriques - Teil 1-9: Elektrische Prüfverfahren - Unsymmetriedämpfung
Affaiblissement de disymétrie (perte de conversion (Unsymmetriedämpfung am nahen und am fernen Ende)
longitudinale, perte de transfert de conversion longitudinale)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2016-11-04.

It has been drawn up by CLC/TC 46X.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.



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.
Project: 61098 Ref. No. prEN 50289-1-9:2016 E

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prEN 50289-1-9:2016
1 Contents Page
2 European foreword . 3
3 1 Scope . 5
4 2 Normative references . 5
5 3 Terms and definitions . 5
6 4 Test method . 6
7 4.1 Method A: measurement using balun setup . 6
8 4.1.1 Test equipment . 6
9 4.1.2 Test sample . 6
10 4.1.3 Calibration procedure . 7
11 4.1.4 Measuring procedure . 9
12 4.1.5 Expression of test results . 10
13 4.2 Method B: measurement using balun-less setup. 11
14 4.2.1 Test equipment . 11
15 4.2.2 Test sample . 12
16 4.2.3 Calibration procedure . 12
17 4.2.4 Measuring procedure . 12
18 4.2.5 Expression of test results . 13
19 5 Test report . 14
20 Annex A (informative) General background of unbalance attenuation . 15
21 A.1 General. 15
22 A.2 Unbalance attenuation near end and far end . 15
23 A.3 Theoretical background . 17
24 Bibliography . 21
25
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26 European foreword
27 This document [prEN 50289-1-9:2016] has been prepared by CLC/TC 46X "Communication cables".
28 This document is currently submitted to the Enquiry.
29 The following dates are proposed:
(doa) dor + 6 months
• latest date by which the existence of this document has to
be announced at national level
(dop) dor + 12 months
• latest date by which this document has to be implemented
at national level by publication of an identical national
standard or by endorsement
(dow) dor + 36 months
• latest date by which the national standards conflicting with
(to be confirmed or
this document have to be withdrawn
modified when voting)
30 This document will supersede EN 50289-1-9:2001.
31 EN 50289-1, Communication cables — Specifications for test methods, is currently composed with the
32 following parts:
33 — Part 1-1: Electrical test methods — General requirements;
34 — Part 1-2: Electrical test methods — DC resistance;
35 — Part 1-3: Electrical test methods — Dielectric strength;
36 — Part 1-4: Electrical test methods — Insulation resistance;
37 — Part 1-5: Electrical test methods — Capacitance;
38 — Part 1-6: Electrical test methods — Electromagnetic performance;
39 — Part 1-7: Electrical test methods — Velocity of propagation;
40 — Part 1-8: Electrical test methods — Attenuation;
41 — Part 1-9: Electrical test methods — Unbalance attenuation (transverse conversion loss TCL transverse
42 conversion transfer loss TCTL);
43 — Part 1-10: Electrical test methods — Crosstalk;
44 — Part 1-11: Electrical test methods — Characteristic impedance, input impedance, return loss;
45 — Part 1-12: Electrical test methods — Inductance;
46 — Part 1-13: Electrical test methods — Coupling attenuation or screening attenuation of patch cords /
47 coaxial cable assemblies / pre-connectorised cables;
48 — Part 1-14: Electrical test methods — Coupling attenuation or screening attenuation of connecting
49 hardware;
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50 — Part 1-15: Electromagnetic performance — Coupling attenuation of links and channels (Laboratory
51 conditions);
52 — Part 1-16: Electromagnetic performance — Coupling attenuation of cable assemblies (Field conditions);
53 — Part 1-17: Electrical test methods — Exogenous Crosstalk ExNEXT and ExFEXT.
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54 1 Scope
55 This draft European Standard details the test methods to determine the attenuation of converted differential-
56 mode signals into common-mode signals, and vice versa, due to balance characteristics of cables used in
57 analogue and digital communication systems by using the transmission measurement method. The
58 unbalance attenuation is measured in, respectively converted to, standard operational conditions. If not
59 otherwise specified, e.g. by product specifications, the standard operational conditions are a differential-mode
60 which is matched with its nominal characteristic impedance (e.g. 100 Ω) and a common-mode which is
61 loaded with 50 Ω. The difference between the (image) unbalance attenuation (matched conditions in the
62 differential and common-mode) to the Betriebs- (operational) unbalance attenuation (matched conditions in
63 differential-mode and 50 Ω reference load in the common-mode) is small provided the common-mode
64 impedance Z is in the range of 25 Ω to 75 Ω.
com
65 For cables having a nominal impedance of 100 Ω, the value of the common-mode impedance Z is about
com
66 75 Ω for up to 25 pair- count unscreened pair cables, 50 Ω for common screened pair cables and more than
67 25 pair- count unscreened pair cables, and 25 Ω for individually screened pair cables. The impedance of the
68 common-mode circuit Z can be measured more precisely either with a time domain reflectometer (TDR)
com
69 or a network analyser. The two conductors of the pair are connected together at both ends and the
70 impedance is measured between these conductors and the return path.
71 This draft European Standard is bound to be read in conjunction with prEN 50289-1-1, which contains
72 essential provisions for its application.
73 2 Normative references
74 The following documents, in whole or in part, are normatively referenced in this document and are
75 indispensable for its application. For dated references, only the edition cited applies. For undated references,
76 the latest edition of the referenced document (including any amendments) applies.
77 prEN 50289-1-1:2016, Communication cables — Specifications for test methods — Part 1-1: Electrical test
78 methods — General requirements
79 EN 50289-1-8, Communication cables — Specifications for test methods — Part 1-8: Electrical test
80 methods — Attenuation
81 EN 50290-1-2, Communication cables — Part 1-2: Definitions
82 3 Terms and definitions
83 For the purposes of this document, the terms and definitions given in EN 50290-1-2 and the following apply.
84 3.1
85 unbalance attenuation
86 logarithmic ratio of the differential-mode power (transmission signal of a balanced pair) to the common-mode
87 power (signal in the pair to ground/earth unbalanced circuit) measured at the near and at the far end
88 Note 1 to entry: The (operational) unbalance attenuation is described by the logarithmic ratio of the differential-mode
89 power to the common-mode power in standard operational conditions. If not otherwise specified, e.g. by product
90 specifications, the standard operational conditions are a differential-mode which is matched with its nominal
91 characteristic impedance (e.g. 100 Ω) and a common-mode which is loaded with 50 Ω:
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 
P U Z
diff diff com
 
92 a = 10×lg = 20×lg +10×lg (1)
u
 
P U Z
com com  diff 
93 where
P is the power in the differential-mode (balanced) circuit;
diff
P is the power in the common-mode (unbalanced) circuit;
com
U is the voltage in the differential-mode (balanced) circuit;
diff
U is the voltage in the common-mode (unbalanced) circuit;
com
Z is the characteristic impedance of the differential-mode (balanced) circuit;
diff
Z is the characteristic impedance of the common-mode (unbalanced) circuit.
com
94 3.2
95 transverse conversion loss
96 TCL
97 logarithmic ratio of the differential-mode injected signal at the near end to the resultant common-mode signal
98 at the near end of a balanced pair, and which is equal to unbalance attenuation at near end when the CUT is
99 terminated with the same impedances as defined for unbalance attenuation measurement
100 Note 1 to entry: This definition stems from ITU-G.117.
101 3.3
102 transverse conversion transfer loss
103 TCTL
104 logarithmic ratio of the differential-mode injected signal at the near end to the resultant common-mode signal
105 at the far end of a balanced pair, and which is equal to unbalance attenuation at far end when the CUT is
106 terminated with the same impedances as defined for unbalance attenuation measurement
107 Note 1 to entry: This definition stems from ITU-G.117.
108 4 Test method
109 4.1 Method A: measurement using balun setup
110 4.1.1 Test equipment
111 a) It is mandatory to create a defined return (common-mode) path. This is achieved by grounding all other
112 pairs and screen(s) if present in common to the balun ground. However in addition in the case of
113 unscreened cables the cable under test shall be wound onto a grounded metal drum. The drum surface
114 may have a suitable groove, wide enough to contain the cable, and shall be adequate to hold 100 m of
115 cable in one layer. The pair under test shall be terminated with differential-mode and common-mode
116 terminations and grounded at near and far ends
117 b) A network analyser or generator/receiver combination suitable for the required frequency and dynamic
118 range.
119 c) The baluns shall have a common-mode port and the characteristics given in prEN 50289-1-1:2016,
120 Table 1.
121 d) Time domain reflectometer (optional).
122 4.1.2 Test sample
123 The ends of the cable under test (CUT) shall be prepared so that the twisting of the pairs/quads is maintained
124 up to the terminals of the test equipment. If not otherwise specified the CUT shall have a length of
125 100 m ± 1 m. For the measurement or evaluation of the equal level unbalance attenuation at the far end the
126 following applies: if the CUT length is not otherwise specified and the attenuation of the CUT at the highest
127 frequency to be measured is higher than or equal to 80 dB the length of the CUT may be reduced to limit the
128 attenuation to maximum 80 dB.
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129 All pairs not under test and all screens shall be connected in common to the same ground as the balun at
130 both ends of the CUT.
131 For unscreened cables the CUT shall be wound tightly around the metal drum in one layer. The distance
132 between the windings should be at least the diameter of the cable. The metal drum shall be connected to the
133 same ground as the balun, e.g. by fixing the baluns to the drum.
134 4.1.3 Calibration procedure
135 a) The reference line calibration (0 dB-line) shall be determined by connecting coaxial cables between the
136 analyser input and output. The same coaxial cables shall also be used for the balun loss and unbalance
137 attenuation measurements. The calibration shall be established over the whole frequency range specified
138 in the relevant cable specification. This calibration method is valid for closely matched baluns that satisfy
139 the characteristics of Table 1.
140 b) Figure 1 gives the schematic for the measurement of the differential-mode loss of the baluns. Two baluns
141 are connected back to back on the symmetrical output side and their attenuation measured over the
142 specified frequency range. The connection between the two baluns shall be made with negligible loss.

U U U
0 diff 1
50 Ω
50 Ω
IEC  654/07
143
144 Key
145 U voltage at network analyser port or signal generator
0
146 U voltage at network analyser port or receiver
1
147 U voltage at symmetrical port of baluns
diff
148 Figure 1 — Test set-up for the measurement of the differential-mode loss of the baluns
149 The differential-mode loss of the baluns is given by:
 
U
0
 
( )
α = 0,5× 20×lg =−0,5× 20×lg S (2)
diff 21
 
U
1
 
150 where:
is the differential-mode loss of the balun (dB);
α
diff
S is the scattering parameter S (forward transmission coefficient) where port 1 is the primary
21 21
(unbalanced side) side of the near end balun and port 2 is the primary side (unbalanced port) of
the far end balun.
151 c) Figure 2 gives the schematic for the measurement of the common-mode loss of the baluns. The baluns
152 used in b) are connected together; the unbalanced balun ports are terminated with the nominal test
153 equipment impedance, the test equipment is connected to the common-mode port (centre tap) of the
154 baluns.
155
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U U
0
1
50 Ω 50 Ω
50 Ω
50 Ω
IEC  655/07
156
157 Key
158 U voltage at network analyser port or signal generator
0
159 U voltage at network analyser port or receiver
1
160 Figure 2 — Test set-up for the measurement of the common-mode loss of the baluns
161 The common-mode loss of the baluns is given by
 
U
0
 
α = 0,5× 20×lg =−0,5×(20×lg S )
(3)
com 21
 
U
1
 
162 where:
α is the common-mode loss of the balun (dB);
com
S is the scattering parameter S (forward transmission coefficient) where port 1 is the common-
21 21
mode port of the near end balun and port 2 is the common-mode port of the far end balun.
163 d) The operational attenuation of the balun α takes into account the common-mode and differential-
balun
164 mode losses of the balun:
α =α +α
(1)
balun diff com
165 where
166 α is the operational attenuation or intrinsic loss of the balun (dB).
balun
167 NOTE More precise results can be obtained using either poling of the baluns for α and α and averaging the results or using
diff com
168 three baluns. In the latter case, the assumption of identical baluns is not required.
169 e) The voltage ratio of the balun can be expressed by the turns ratio of the balun and the operational
170 attenuation of the balun:
U Z
diff diff
20×lg = 10×lg −α
balun
U Z
0 0

(4)
U Z
diff diff
20×lg = 10×lg −α
balun
U Z
1 1
171 where
172 U is the differential-mode voltage at the input of the cable under test (V);
diff
173 U is the voltage at the network analyser port or signal generator (V);
0
174 Z is the characteristic impedance of the differential-mode circuit (Ω);
diff
175 Z is the output impedance of the network analyser or signal generator (Ω);
0
176 U is the voltage at the input of the load (V);
1
177 Z is the input impedance of the load (Ω).
1
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178 4.1.4 Measuring procedure
179 All pairs/quads of the cable shall be measured at both ends of the CUT. The unbalance attenuation shall be
180 measured over the whole-specified frequency range and at the same frequency points as for the calibration
181 procedure.
182 The measurement is done under standard operational conditions, i.e. one is measuring the Betriebs-
183 (operational) unbalance attenuation. If not otherwise specified, e.g. by product specifications, the standard
184 operational conditions are a differential-mode which is matched with its nominal characteristic impedance
185 (e.g. 100 Ω) and a common-mode which is loaded with 50 Ω.
186 Figure 3 gives a schematic of the measurement for unbalance attenuation at the near end.

CUT
U
U diff 50 Ω
0
50 Ω
50 Ω
U
n, com
50 Ω
IEC  656/07
187
188 Figure 3 — Test set-up for unbalance attenuation at near end (TCL)
U
0
α = 20×lg =−20×lg S
(5)
meas 21
U
n, com
189 where
is the measured attenuation (dB);
α
meas
S is the scattering parameter S (forward transmission coefficient) where port 1 is the primary
21 21
(unbalanced) side of the near end balun and port 2 is the common-mode port of the near end
balun
U voltage in the primary (unbalanced) circuit at the near end balun
0
U voltage in the common-mode circuit (V) at the near end balun
n,com
190 Figure 4 gives a schematic of the measurement for unbalance attenuation at far end.
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CUT
U
U 50 Ω
0 diff
50 Ω
50 Ω
U
f, com
50 Ω
IEC  657/07
191
192 Figure 4 — Test set-up for unbalance attenuation at far end (TCTL)
U
0
α = 20×lg =−20×lg S
(7)
meas 21
U
f, com
193 where
is the measured attenuation (dB);
α
meas
S is the scattering parameter S (forward transmission coefficient) where port 1 is the primary
21 21
(unbalanced) side of the near end balun and port 2 is the common-mode port of the far end
balun;
U voltage in the primary (unbalanced) circuit at the near end balun;
0
U voltage in the common-mode circuit (V) at the far end balun.
n,com
194 4.1.5 Expression of test results
195 The unbalance attenuation is defined as the logarithmic ratio of the differential-mode power to the common-
196 mode power:
P
U Z
diff
diff com
α = 20×lg = 20×lg +10×lg
(8)
u,n
U Z
P
u, f diff
n,com
n,com
f,com
f,com

197 where
is the unbalance attenuation (dB) at the near end (subscript n) respectively far end (subscript
α
u
f);
P is the common-mode power (W) at the near end (subscript n) respectively far end (subscript
com
f);
P is the differential-mode power (W);
diff
Z is the nominal characteristic impedance of the differential-mode of the CUT;
diff
Z is the standardized operational impedance of the common-mode, 50 Ω.
com
198 When measuring with S-parameter test-sets, the output voltage of the generator is measured instead of the
199 differential-mode voltage in the cable under test. Taking the operational attenuation of the balun into account,
200 the formula for the unbalance attenuation near or far end is:
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P P
diff 0
α = 10×lg = 10×lg −α
u, n balun
P P
u, f n,com n,com
f, com f, com

(8)
U Z
0 com
= 20×lg +10×lg −α
balun
U Z
0
n, com
f, com
Z
com
α =α +10×lg −α
(9)
u, n meas balun
Z
f, n 0
201 The equal level unbalance attenuation at the far end is then:
Z
com
ELα =α +10×lg −α −α
(10)
u, f meas balun cable
Z
0
202 where
EL α is the equal level unbalance attenuation at far end (EL TCTL) (dB);
u,f
α is the unbalance attenuation (dB) at the near end (subscript n) respectively far end
u
(subscript f);
is the operational attenuation or intrinsic loss of the balun (dB);
α
balun
is the attenuation of the pair under test (dB) and is measured according to EN 50289-1-8;
α
cable
P is the common-mode power (W) at the near end (subscript n) respectively far end
com
(subscript f);
P is the differential-mode power (W);
diff
Z is the impedance of the generator (Ω);
0
Z is the standardized operational impedance of the common-mode, 50 Ω.
com
203 4.2 Method B: measurement using balun-less setup
204 4.2.1 Test equipment
205 Method B is the preferred one for balanced cables for frequencies above 1 000 MHz as it avoids the use of
206 baluns which are often limited to 1 000 MHz. With this configuration it is possible to change the operational
207 conditions for unbalance attenuation to any desired value of the differential-mode and common-mode
208 reference impedance.
209 It is mandatory to create a defined return (common-mode) path. This is achieved by grounding all other pairs
210 and screen(s) if present in common to the test system ground. However in addition in the case of unscreened
211 cables the cable under test shall be wound onto a grounded metal drum. The drum surface may have a
212 suitable groove, wide enough to contain the cable, and shall be adequate to hold 100 m of cable in one layer.
213 The pair under test shall be terminated with differential-mode and common-mode terminations and grounded
214 at near and far ends.
215 Multiport vector network analyser VNA (having at least 4 ports) with:
216 – S-parameter set-up;
217 – A mathematical conversion from unbalanced to balanced, i.e. the mixed mode set-up which is often
218 referred to as an unbalanced, modal decomposition or balun-less setup. This allows measurements of
219 balanced devices without use of an RF balun in the signal path. With such a test set-up, all balanced
220 and unbalanced parameters can be measured over the full frequency range;
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221 – Coaxial cables – where the characteristic impedance shall be the same as the nominal impedance of
222 the VNA – are needed to interconnect the network analyser, switching matrix and the test fixture. The
223 screen of the coaxial cables shall have a low transfer impedance, i.e. double screen or more with a
224 transfer impedance less than 100 mΩ/m at 100MHz. The screens of each cable shall be electrically
225 bonded to a common ground plane, with the screens of the cable bonded to each other at multiple
226 points along their length. To optimize the dynamic range, the total interconnecting cable attenuation
227 shall not exceed 3 dB at 1 000 MHz;
228 – To perform a calibration at the end of the coaxial interconnection cable coaxial reference standards,
229 so called calibration standards, i.e. a short circuit, an open circuit and a reference load, are required.
230 An alternative to the before mentioned open, short and load references is the use of an electronic
231 multiport calibration kit (E-cal module) which is supplied by the supplier of the VNA.
232 – If the calibration is performed at the test interface calibration reference artefact, i.e. a short circuit, an
233 open circuit and a reference load, are required. For further details refer to prEN 50289-1-1.
234 4.2.2 Test sample
235 The ends of the cable under test (CUT) shall be prepared so that the twisting of the pairs/quads is maintained
236 up to the terminals of the test equipment. If not otherwise specified the CUT shall have a length of
237 100 m ± 1 m. For the measurement or evaluation of the equal level unbalance attenuation at the far end the
238 following applies: if the CUT length is not otherwise specified and the attenuation of the CUT at the highest
239 frequency to be measured is higher than or equal to 80 dB the length of the CUT may be reduced to limit the
240 attenuation to maximum 80 dB.
241 All pairs not under test and all screens shall be connected in common to the test system ground at both ends
242 of the CUT.
243 For unscreened cables the CUT shall be wound tightly around the metal drum in one layer. The distance
244 between the windings should be at least the diameter of the cable. The metal drum shall be connected to the
245 test system ground.
246 4.2.3 Calibration procedure
247 It is not the intent of the standard to detail the algorithms applied by a VNA to correct the measured results
248 based on a calibration procedure but to detail the calibration procedure. Further information may be obtained
249 in the manuals of the VNA supplier.
250 A full 4-port single ended (SE) calibration shall be performed. The calibration shall be either performed at the
251 ends of the coaxial interconnection cables or on the test interface.
252 In the first case open, short and load measurements (using coaxial reference standards, so called calibration
253 standards) shall be taken at the ends of the coaxial interconnection cables of each port concerned, and
254 through and isolation measurements shall be taken on every pair combination of those ports. One may also
255 use an electronic multiport calibration kit (E-cal module) which reduces significantly the calibration time. As
256 the calibration plane is the end of the coaxial interconnection cables the ef
...