ࡱ> HGF(Root Entry) FPuݤ@WordDocument0& ?SWObjectPool  02YKݤKݤSummaryInformation( $D 9!,%&'()*+[-./012345678:;<=>?@VBCDEFGHIJKLMNOPQRSTUmXYZ[\]^_`abcdefghijklpqrstuvwxyz{|}~Equation Native <CompObjjOle10NativeoEquation Nativel    A !"#$%&'()+,-./0123456789:;<=>?@BCJKLMNOPQRTUVWXYZ\ FMicrosoft Word Document MSWordDocWord.Document.69qr - aluminium foil strips wrapped in the same direction over the conductor twisted pairs. The cable screen conductor (i.e. its outer part) formed the inner conductor of an energized coaxial system. The cable was put in a metal tube, a diameter of which depends on the cable outer diameter and the requirement to form the 50 W system with the cable screen as the inner conductor. Fig. 2 displays the respective measuring system in principle.   EMBED Word.Picture.6  Figure  SEQ Figure \* ARABIC 2. Arrangement for ZT measurement Two measuring methods generally applied, differ in the cable excitation mode. In one of them the signal is fed through the interconnected resistance to the cable inner conductors which are short circuited (ZG1). The resistance should be equal to about 1.4 times the value of the outer system characteristic impedance [1]. In the other measuring method all the inner conductors are short circuited to the cable screen conductor. This method was found suitable when the measuring system is of low sensitivity and it was selected for the experiment. The transfer impedance can be calculated from the following equation:  EMBED Equation.2  ZT transfer impedance [W], Z1 characteristic impedance of the outer system [W], l1 the electrical wavelength in the outer system [m], U1 the measured input voltage [V], U2 the voltage between the inner conductor and common ground (screen) [V], F" the factor depending on the cable length. The cable, which is used as the inner conductor, is not to be longer than 0.35 l. If the cable is shorter than 0.05 l, no terminating resistance (ZL) is needed for measurements. The factor F" value equals unity no matter which type of the voltmeter is used for voltage measurements. In the measuring sample design the triple coaxial system dimensions, which ensure the outer system characteristic impedance of 50 W, had to be found. The coaxial line characteristic impedance is calculated from:  EMBED Equation.2  where d is the inner conductor diameter, b the outer conductor diameter, e the permittivity and m permeability. The cable under test must be centred to obtain the uniform characteristic impedance. Teflon (PTFE) rings were mounted every 60 mm for that purpose. The coaxial structure dimensions were corrected on the basis of the average dielectric constant that follows from:  EMBED Equation.2  where er denotes the average permittivity, er1 the dielectric rings permittivity, er0 air (vacuum) permittivity, l the length between rings, l1 the ring width. The average permittivity of the experimental model was er=1,1833 and it was used for the electric wavelengths corrections. The characteristic impedance of 52.71 W was obtained by the test-setup dimensions b=13.0 mm and d=5mm (without outer PVC jacket). This impedance value produces the acceptable return loss of 31.57 dB (reflection coefficient: 0.026). The tested structure was made of brass rings of 0.64 m max. length (Fig.3). This test-setup can easily be adapted to different lengths of the cable under test.  EMBED Word.Picture.6  Figure  SEQ Figure \* ARABIC 3. Testing arrangement  EMBED Word.Picture.6  Figure  SEQ Figure \* ARABIC 4. Transfer impedance setup blockdiagram  EMBED MSGraph  Figure  SEQ Figure \* ARABIC 5. Measurement data A vector voltmeter was used as measuring instrumentation (Fig.4). Transmission line input voltage was measured by the probe A. The sample under test represented the inductive transmission line with short circuit termination. To avoid the reactive load (short circuit) impact on the generator, a 10 dB attenuator was interconnected between the generator and the probe A. The quality of the connections in the tested sample and the cable screen connection to the outer tube was tested by a network analyzer. When good enough the short circuit stub characteristics will be displayed on the network analyzer. The 0.64 m sample fulfilled the requirement of homogeneous field distribution in the constructed structure. Transfer impedance for each inner conductor (marked with different colour) of the cable is presented in the logarithmic scale (Fig.5). Note that the transfer impedance function slope changes above 30 MHz due to the measuring system resonant behaviour at 60 MHz caused by the probe B capacitance and shorted stub inductance. 4. CONCLUSIONS The accuracy of the symmetrical cable parameters measurements depends on the design of the coupling network used for impedance transformation. By accurate transformer scattering parameter determination, the factor for the corrections can be found using the error matrix method. At 30 MHz the tested sample was 0.069 l long. Although this dimension exceed the limits, the correction function value did not much differ from unity. Fig.5 depicts transfer impedance increase of approximately 10 dB/dec. and the strong frequency dependence of ZT near the resonance frequency of 60 MHz Root Entry)6tݤ@WordDocument0& ?SWObjectPool  02KݤKݤSummaryInformation( $D 9!,%&'()*+[-./012345678:;<=>?@VBCDEFGHIJKLMNOPQRSTUmXYZ[\]^_`abcdefghijklpqrstuvwxyz{|}~23;<=de^aijl r t + , / 0 G H I J Q R h i j k '(?Ŀ}tuDp]`c ]acuD]c]cuDUN}5U]`cKuDUN}5]acvK U]`cuDU]`c U]`c ]`c ]`c U]`c ]`c]c]c[]cuD1CU[]cG CU[]cuDCU[]c U[]c*?@ABCJKabcdwxyXYZ[    '(+-.^_bcde  V]`c ]`cuD!5V]`ceKuD!5]acvKuDV]`c ]`ch V]`ch V]`c ]`c V]chV]c ]acuD]c]cuDp]`cuD<|5]`cKuD<|5]acvK2/0CDEFHIOPqs   /012NOjkl  ]`c U]`c ]`chuD!5]`ceKuD!5]acvK V]`c \]`cuDC!5]`ceKuDC!5]acvKuD]`c ]`c V]`ch V]`c ]`c7FGHILM]^_`hi񨟚 U]`c]` uDܵ5KuDܵ5]acvKuDuD]ac ]`cuD5]`cKuD5]acvKuD^]`c ]acuD]c]cuD5]`cKuD5]acvK ]`cuD]`c0 !9!!!"X""""#v###$A$B$M$N$U$W$X$Y$[$]$^$a$d$e$2Ⱦĺظu]c V]ch]cV]cuD V]`c ]`c ]`c U]`c V]`ch V]`c ]`c ]`c$?ef3^_`ajkl  . $&'C&r&&&&&&&&&&)2 ))) )))))H ))))/ &&& ),,77,, ,$ +b <=./GHIFGHI)))))))))))"))))))p)&&O &&&&-&& 7 ,0 ,0x0,0 ,0 ,00,0 I &!!;")P)=)))))))w))o))* , 4[]0( , 4[]0% , 4[]0 ,0 ,0Root Entry)``ݤ@WordDocument0& ?2ObjectPool  02KݤKݤSummaryInformation( $ 9!,#%&'()*+"-./012345678:;<=>?@VBCDEFGHIJKLMNOPQRSTUmXYZ[\]^_`abcdefghijklpqrstuvwxyz{|}~DocumentSummaryInformation8_897404501= FKݤ0Uݤ_8973344156 F0UݤpXݤ_898245011 /FpXݤFZݤ  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEHJMNOPQRSTUVY[]^_`abcdefikmnpqtvwxyz{|}~՜.+,0HP\dl t| FER: 4Transfer Impedance Measurement of UTP or STP Cable Oh+'00 DP x   4Transfer Impedance Measurement of UTP or STP Cable ZAVOD ZA VF TEHNIKU Normal.dotT Nagy Robert17Microsoft Word for Windows 95@} @n@)n@ݤk@ 6B&'()@3BZ3&1 Arial2 "General00.00#,#_898244931)FFZݤFZݤ_898245054 "FFZݤFZݤ_898244350  FFZݤ[ݤ_898244348 F[ݤPS]ݤ_898545116FPS]ݤ^ݤOle KPIC  ILMETA A(.A55 ....()()))()()Z:.6"e phoenix n 20(\ :tv}20(: v}20(<v} (approximately 20 dB/dec.). For transfer impedance measurements above 30 MHz a cable sample must be shortened to avoid resonance problems. The sensitivity decreases at lower frequencies. REFERENCES International Standards, 47250, DIN 89159, ISO/IEC 8802-3; 1993, CEI/IEC 1196-1-1, 1994. EIA/TIA Bulletin, Technical Systems Bulletin, Additional Cable Specifications for Unshielded Twisted Pair Cables, TSB-36, Nov.1991. Breitenbach, O. and T.Hhner; Kabelschirmung im bergang von MHz- zu GHz-Frequenzen, Nachrichten Tech. Z., Bd.46, Heft 8, pp. 602-608, 1993. Hoeft, L.O. and J.S.Hofstra,Measured Electro-magnetic Shielding Performance of Commonly Used Cables and Connectors, IEEE Trans. Electromagn. Compat., Vol.30, No.3, Aug., pp.260-275.,1988. Hoeft, L.O. and J.S.Hofstra,Measurement of Surface Transfer Impedance of Multi-Wire Cables, Connectors and Cable Assemblies, IEEE International EMC Symposium, Anaheim, 1992. Koren Z.,Transfer Impedance Measurement of Ship Telecommunications Cable FMGCG 7 X 2 X 0,75 According to DIN 47250 (in Croatian), Research Report  f [MHz] ZT [mW/m] .A55 ....()()))()().A55 ....()()))()().A55 ....()()))()().A55 ....()()))()().A55 ....()()))()().A55 ....()()))()())=`)  I.@`) h l./CompObjGLObjInfoFOle10Native DPIC ZLMETA o+CompObjXbObjInfoWObjectPoolC[ݤPS]ݤWordDocumentWB+SummaryInformation(LPIC jLMETA hCompObjhbObjInfogObjectPool[ݤ[ݤWordDocument !SummaryInformation(\Ole PIC !$LMETA uCompObj#&sZObjInforOle10Native%'oEquation Native lOle PIC (+LMETA CompObj*,WObjInfo-Ole10NativesOle PIC .1LMETA HCompObj03ZObjInfoOle10Native24Equation Native PIC LMETA 58CompObjbObjInfo7:ObjectPoolD8WݤpXݤWordDocument9;SummaryInformation(PIC LMETA <?*HCompObjbObjInfo>AObjectPoolpLݤpLݤWordDocument@B>SummaryInformation(_897171981G F[ݤPS]ݤ#0 #,##0.00#,##0" HRD";\-#,##0" HRD"#,##0" HRD";[Red]\-#,##0" HRD" #,##0.00" HRD";\-#,##0.00" HRD"%$#,##0.00" HRD";[Red]\-#,##0.00" HRD"0%0.00% 0.00E+00 d\.m\.yy d\.mmm\.yyd\.mmmmmm\.yy h\:mm\ AM/PMh\:mm\:ss\ AM/PMh\:mm h\:mm\:ssd\.m\.yy\ h\:mm @ @@@@C:\RADOVI\IMEKO\ZTZEL.DAT@C:\RADOVI\IMEKO\ZTSME.DAT@C:\RADOVI\IMEKO\ZTNAR.DAT@C:\RADOVI\IMEKO\ZTNAR.DAT@C:\RADOVI\IMEKO\ZTPLA.DAT xorang. green blue brown?33333T@33333T@fffffQ@fffffW@@fffff6g@f@fffffFf@fffff&j@$@p@n@n@33333p@0@fffff^w@ u@1u@33333w@4@z@Aw@y@33333Kz@>@@1~@33333π@fffffn@I@l@@fffff@33333G@N@ Q@ fffffl@ 33333@ fffff^@ 33333@ T@ 33333߄@ fffff@ 33333@ fffff@ V@ w@ t@ }@ @~~HPPCL5EHP LaserJet 4LLPT1:HP LaserJet 4L  D  ɓL3, ,l|-lD*XiUZUw~ w401 Arial1Times New Roman323   4 3  orang.4 3 green4 3 blue4 3 brown43" 23   4Mr3%3&423  47(43*?&! ! 43*?@<&! ! 4523   43      44%b 63&23   4'44 =  .6"  FMicrosoft GraphMSGraphMSGraphL.6"e Oh+'0  $ H l   DhC:\WINWORD\TEMPLATE\NORMAL.DOT.6"     '  ' " a"Arial-6Times New Roman-"System-'- X")--  ,---'--- )--  $----'--- MP m m\\MM  L L   ; ;     ) )   ++qq---'--- ---'--- MP  g g ---'--- ---'--- %kMP  d d v v V V     H H ooaaSS---'--- ---'--- %kMP    ---'--- )-- g g   ---'--- ---'--- }3g-v \ % v  ; T z / SU v /  "      SNrv /  L  /  a  S@ v f - j  7  B " SM )-- $TuTv $w B w / w B\ $  ] ]  % $ P' o '  v $, bt  t ,  $  U Z   ; $ :  ::  T $ gR  R  z $4 |  z| 4 / S$R 0 Rx 0 R U $ T  T  )--guv = / / u   P0 "  bj  t U   5 :  g   L z S " - N)-- $urv $w  */ *w / $ u   u   $5 P  5 L  $ b     $ B U  B /  $x  : x   $e g  e a  $  z   S $R o o R @  $  )-->l- 5uu5v - w # & -w   / w  w / w  f -  # w -g   g  g  g  - -  c} -,  t ,  P,  , t Pj -  u -j   j " bj " j  b -  hc -  Z   U   Z U7 -   1-5  } :5  5  :5 }  -  ze -  \   g   \ gB -   q-B   zB  B  zB  " S-  s -" R j " R " R " Rj M - . -O   O  O  O  ---'--- ---'--- ---'--- X"---'--- X"---'--- ]'   2 HL10ee 2 100eee 2 1000eeee2 10000eeeee---'--- X"---'--- ]'  2 1e 2 d 10ee 2 >100eee---'--- X")-- HP ---'--- TG---'--- %-Y?YY~)-- $W8W.2 orang.`[ene5.---'--- TG---'--- -3?33~)-- z8.2 greene[[[n.---'--- TG---'--- j- ?  ~)--  $U8U. 2 bluen:j[.---'--- TG---'--- p/x-?~)-- 9/- 0880 .2 brownn[`n.---'--- TG---'--- X"--'Mr3%ZAVOD ZA VF TEHNIKUZAVOD ZA VF TEHNIKU@g@@g@Microsoft Word 6.02ܥe- eB+n"l"ll"l"""""""""" " "s*A"""""''''((((9)U**T+:s*"'",'''s*'l"l"""''''l"$"""'""l"l"l"l"'''' SCREEN UNDER TEST 10 dB PAD CHANNEL A CHANNEL B RF GENERATOR HP 8640B VECTOR VOLTMETER HP 8405 A $ pn.A9192 00&&*0y0& &EDL00&C ? > P00&J<P20(& n{00& a`P00& <P00&9!P00&9!%$P0x0&!&L2}0(l#2|0((#82{0(=#w 2~0(%52X0(5#J2[0(> 00&%*00&f% *00&q&*00&>=.0$ 0z0&p ~&L0w0&'L.v0$O' 0u0&a&*0t0&w&L0o0&l#n 0n0&s%*0m0&k"&*0l0&_ "&*0k0&f%*0j0&q"&*0i0&q"&*.f0$0 P.e0$P0d0&Ol#n 0c0&%*0b0&"&*0a0&"&*0`0&%*0_0&"&*0^0&"&*0]0&) %>*Fv}rZ0hNNs&r*&u*0W0&@*0V0&7  *0U0&7*0T0&/  *0S0&/ *0R0&&&  *0Q0&&7 *0P0&? *0O0&G *0N0&P*0M0& ` *0L0& i *0K0&q *0J0&q *0I0&y *0H0& *0G0& *0F0& *0E0&  *0D0& *0C0& *0B0& *0A0&  *0@0& *0?0&  *0>0& *0=0& *0<0& *0;0&  *0:0& *090&y  *080&q *070&i *060&` *050&P  *040&G *030&? *020&7 *010&&  *000& *0/0&~  *0.0&~*0-0&~ *0,0&u  *0+0&u*0*0&m *0)0&m *0(0&e *0'0&e *0&0&\  *0%0&\ *0$0&T *0#0&Tn*0"0&Ke *0!0&K] *0 0&CU *00&CL *00&:D *00&2< *00&23 *00&*3 *00&*+ *00&!+  *00&"  *00&"  *00&" *00&" *00&" *00&+  *00&+ *00&3 *00&3 *00&<  *00&D *0 0&L *0 0&U  *0 0&] *0 0&e *0 0&n*00& *00& *00&*00&  *00&*00& *00&*00&*r0hxt&s*&m*5ࡱ; au ]abcuDac&@{KK&K@Normala c"A@"Default Paragraph Font"-9=Qmp!a  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~Gw 9i+]%UCs 1 a ! 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A J a c  /CEL]_he!: : :::: : : IJKe!}111ZAVOD ZA VF TEHNIKUC:\ROBERT\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\ROBERT\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\ROBERT\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\ROBERT\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\ROBERT\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\RADOVI\IMEKO\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\RADOVI\IMEKO\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\RADOVI\IMEKO\IMEKOFK.DOCZAVOD ZA VF TEHNIKUC:\RADOVI\IMEKO\IMEKOFK.DOC Nagy RobertD:\radovi\imeco96\IMEKOFK.DOC@Hewlett Packard LaserJet 6LLPT1:winspoolHewlett Packard LaserJet 6LHewlett Packard LaserJet 6LpcXXLetter8  O4''''Hewlett Packard LaserJet 6LpcXXLetter8T O4''''ssNTimes New Roman Symbol &ArialCG Times "Univers 9)Qf 'f6Zk:!)e3Transfer Impedance Measurement of UTP or STP Cable ZAVOD ZA VF TEHNIKU Nagy RobertܥhW ee$WA! HHOOOOOtQQQQQ0Q"RQ"QVNtQbRbRbRbRRRRBTDTDTDTGT U VWXgWeVORbR"RRRVROObRtQRRRRObRObRBT6tݤnPPOOOORBTRRTransfer Impedance Measurement of UTP or STP CablePRIVATE  for 100 Mbit/s Data Transmission Rate Robert Nagy, Zlatko Koren, Borivoj Modlic University of Zagreb, Faculty of Electrical Engineering and Computing Department of Radiocommunications and Microwave Engineering Unska 3, 10000 Zagreb, Croatia Tel. (+385 1)612 97 30, robert.nadj@fer.hr ABSTRACT Measurement of electrical performance of multi-wire shielded structure twisted pair (STP) and unshielded twisted pair (UTP) cables is more difficult than measurement of simple coaxial cable. Characteristic impedance of twisted - pair cable which is usually symmetrical, has values higher than 50 W, therefore impedance transformers were necessary. For accurate measurements using impedance matching transformers, deembeding technique is recommended. The transfer impedance of multi-wire shielded twisted pair (STP) cable was measured using IEC 96-1 triaxial method by a modified test-setup. 1. INTRODUCTION The paper depicts some experiences gained in UTP and STP 4x2x0.6 cables characteristics measurements. The STP cable was intended for 100 Mbit/s data transmission rates. The measurements were based on the standards IEC 96-1 (1986) and IEC 1196-1-1 (1994-05) [1] referring to cable category 5 (for STP). Cable attenuation and near-end crosstalk attenuation were measured in frequency range 10 to 100 MHz for STP and UTP samples. Discrete frequencies of 1; 5; 10; 16; 20 and 30 MHz were used for cable transfer resistance measurements. 2. MEASUREMENTS - GENERAL DESCRIPTION The inspected STP and UTP cables were of a symmetrical structure and characteristic impedance 100 W. Therefore a broadband transformer was needed for 1:2 impedance transformation and non-symmetrical to symmetrical system coupling. Two transformers were designed: for 10-50 MHz and for 50-100 MHz in order to minimize the return loss impact on the measurements results. Fig.1 depicts the reflection at the transformers Tr.1 and Tr.2 input port in the 10 - 50 MHz frequency range. Both transformers were symmetrically loaded with 2 X 50 W.  EMBED Word.Picture.6 Figure  SEQ Figure \* ARABIC 1. Reflection coefficient of transformers input port 3. CABLE TRANSFER IMPEDANCE MEASUREMENT This report presents the triple coaxial setup used for the cable transfer impedance measurement. The screen (shield) of the STP cable is made of two polyester - aluminium foil strips wrapped in the same direction over the conductor twisted pairs. The cable screen conductor (i.e. its outer part) formed the inner conductor of an energized coaxial system. The cable was put in a metal tube, a diameter of which depends on the cable outer diameter and the requirement to form the 50 W system with the cable screen as the inner conductor. Fig. 2 displays the respective measuring system in principle.   EMBED Word.Picture.6  Figure  SEQ Figure \* ARABIC 2. Arrangement for ZT measurement Two measuring methods generally applied, differ in the cable excitation mode. In one of them the signal is fed through the interconnected resistance to the cable inner conductors which are short circuited (ZG1). The resistance should be equal to about 1.4 times the value of the outer system characteristic impedance [1]. In the other measuring method all the inner conducto.A55 ....()()))()()Z:.6"e phoenix n 20(\ :tv}20(: v}20(<v}formation(OlearyInformation PIC MPLMETA