Iec 62153 4 7 2015

I EC 621 53-4-7 ® Ed i ti on 201 5-1 I N TERN ATI ON AL STAN DARD colour i n sid e M etal l i c com m u n i cati on cabl e test m eth ods – Part 4-7: El ectrom agn eti c com pati bil i ty (E M C) – Test m eth od for m easu ri n g of tran sfer i m pedan ce ZT an d screen i n g attenu ati on a s or cou pl i n g atten u ati on a C of n ectors an d assem bl i es u p to an d above G H z – Tri axi al tube i n tu be I E C 62 53-4-7: 01 5-1 2(en ) m eth od International Electrotechnical Commission T H I S P U B L I C AT I O N I S C O P YRI G H T P RO T E C T E D C o p yri g h t © I E C , G e n e v a , S wi tz e rl a n d Al l or ri g h ts by re s e rve d an y e i th e r m eans, IEC c o p y ri g h t yo u r IEC 3, or or l ocal I EC C e n t l ru e de CH -1 21 I E C's h a ve U n l es s o th e rwi s e e l e c t ro n i c or m em be r an N ati o n a l e n q u i ry m em be r s p e c i fi e d , m e ch a n i c a l , a bo u t N a ti o n a l no p a rt i n cl u d i n g C o m m i t te e o b ta i n i n g C o m m i tt e e th e p u b l i c a ti o n c o u n t ry a d d i ti o n a l fo r O ffi c e in of th i s p h o t o c o p yi n g fu rt h e r ri g h t s an d of th e to th i s re p ro d u c e d re q u e s t e r wi t h o u t If yo u h a ve pl eas e or u ti l i z e d p e rm i s s i o n an y c o n t a ct in in an y q u e s ti o n s th e fo rm wri t i n g fro m ab o u t a d d re s s I EC bel ow or i n fo rm a t i o n Tel : + 41 22 91 02 1 F a x: +41 22 91 03 00 G e n e va i n fo @ i e c c h 20 be p u b l i c a ti o n , V a re m b é S wi t ze rl a n d m ay m i c ro fi l m , www i e c c h Ab ou t th e I E C Th e I n t e rn a ti o n a l I n t e rn a t i o n a l E l e c t ro t e c h n i c a l S t a n d a rd s fo r al l Com m i ssi o n e l e c t ri c a l , (I E C ) e l e c t ro n i c and is th e re l a t e d l ea d i n g g l obal o rg a n i z a t i o n th a t p re p a re s an d pu bl i sh es tech n o l o g i es Ab o u t I E C p u b l i ca ti o n s Th e tech n i cal l ates t e d i ti o n , co n te n t a of IEC c o rri g e n d a p u b l i c a ti o n s or an is ke p t am en d m en t u n d er might c o n s ta n t h a ve been I E C C atal og u e - webs tore i ec ch /catal og u e Th e s ta n d - a l o n e b i b l i o g p h i ca l Te ch n i ca l a p p l i cati o n i n fo rm ati o n on S p eci fi cati o n s , d o cu m e n ts Ava i l a b l e fo r fo r I EC PC, M ac th e I n te rn a ti o n a l An d ro i d e n ti re S ta n d a rd s , Re p o rts OS, an d o th e r Ta b l ets an d i Pad a d va n ce d va ri e ty of s e a rch e n a b l es cri te ri a com m i tte e , … ) an d th e Th e wo rl d ' s e l e ctri ca l wi th d wn It to (re fe re n ce al so g i ve s fi n d I EC i n fo rm ati o n on P l e as e m a ke s u re th a t yo u h a ve th e d e fi n i ti o n s in a d d i ti o n a l on l i n e co n ta i n i n g Engl ish an d l an g u ag es d i cti o n a ry m o re F re n ch , Al s o Voca b u l a ry th a n wi th e l e ctro n i c 000 as th e an d te rm s e q u i va l e n t kn o wn (I E V) of 30 te rm s an d in I n te rn a ti o n a l on l i n e I E C G l os s ary - s td i ec ch /g l os s ary p u b l i ca ti o n s n u m b e r, I EC l ead i n g te rm s E l e ctro tech n i ca l I E C pu bl i cati on s s earch - www i ec ch /s earch pu b Th e by E l ectroped i a - www el ectroped i a org co n s u l ti n g Te ch n i ca l re vi e w pu bl i sh ed te xt, by a tech n i cal p ro j e cts , re p l a ce d M o re th a n En g l i sh cl a u s e h a ve p u b l i ca ti o n s 77, 60 an d of I EC been 86 an d 000 F re n ch e l ectrote ch n i ca l e xtra cte d p u b l i cati o n s co l l ecte d from from i ss u e d e a rl i e r te rm i n o l o g y th e Te rm s s i n ce an d 2002 p u b l i ca ti o n s e n tri e s S om e of in D e fi n i ti o n s I EC e n tri e s TC 37, CI S P R I E C J u s t Pu bl i s h ed - webs tore i ec ch /j u s tpu bl i s h ed S ta y up d e ta i l s al so to al l o n ce d ate n ew a on al l n ew p u b l i cati o n s m o n th b y em a i l I EC p u b l i ca ti o n s re l ea s e d J ust Ava i l a b l e P u bl i sh ed on l i n e an d I E C C u s tom er S ervi ce C en tre - webs tore i ec ch /cs c If yo u n eed wi s h C e n tre : International Electrotechnical Commission to g i ve us fu rth e r a ss i s ta n ce , csc@ i ec ch yo u r fe e d b a ck p l e as e ta ct on th e th i s p u b l i ca ti o n or C u s tom e r S e rvi ce I E C 62 53-4-7 ® Ed i ti on 201 5-1 I N TE RN ATI ON AL S TAN DARD colour i n sid e M etal l i c com m u n i cati on cabl e tes t m eth od s – P art 4-7: El ectrom ag n eti c com pati bi l i ty (E M C) – Tes t m eth od for m eas u ri n g of tran s fer i m ped an ce Z T an d s creen i n g atten u ati on a s or cou pl i n g atten u ati on a C of n ectors an d ass em bl i es u p to an d above G H z – Tri axi al tu be i n tu be m eth od I N TERN ATI ON AL ELECTROTECH N I CAL COM MI SSI ON I CS 33 00; 33 20 I SB N 978-2-8322-3054-1 Warn i n g ! M ake s u re th at you obtai n ed th i s pu bl i cati on from an au th ori zed d i stri bu tor ® Reg i stered trad emark of th e I n ternati on al El ectrotech ni cal Commi ssi on International Electrotechnical Commission – – I E C 21 53-4-7 : 20 © I E C 201 C O N TE N TS F O R E W O RD I N T RO D U C T I O N S cope N o rm a ti ve re fe re n ce s T e rm s a n d d e fi n i ti o n s P h ys i c a l b a ckg ro u n d P ri n ci p l e o f th e te s t m e th o d s G e n e l T n s fe r i m p e d a n c e S cre e n i n g a tte n u a ti o n C o u p l i n g a tte n u a ti o n T e s t p ro c e d u re T u b e i n tu b e p ro c e d u re Test eq u i pm en t C a l i b ti o n p ro c e d u re C o n n e c ti o n b e twe e n e x te n s i o n tu b e a n d d e vi c e u n d e r te s t 6 D yn a m i c n g e re s p e c ti ve l y n o i s e fl o o r I m p e d a n ce m a tch i n g 6 I n fl u e n ce o f Ad a p te rs S a m p l e p re p a ti o n 7 C o a x i a l co n n e c to r o r d e vi c e 7 B a l a n c e d o r m u l ti co n d u c to r d e vi c e 7 Cabl e assem bl y M e a s u re m e n t o f tra n s fe r i m p e d a n c e G e n e l P ri n ci p l e b l o ck d i a g m o f tra n s fe r i m p e d a n ce M e a s u ri n g p ro c e d u re – I n fl u e n c e o f c o n n e cti n g c a b l e s M e a s u ri n g E va l u a ti o n o f te s t re s u l ts T e s t re p o rt S cre e n i n g a tte n u a ti o n G e n e l I m p e d a n ce m a tch i n g G e n e l 2 E va l u a ti o n o f te s t re s u l ts wi th m a tc h e d c o n d i t i o n s 2 M e a s u ri n g wi th m i s m a tch 2 E va l u a ti o n o f te s t re s u l ts 2 10 G e n e l T e s t re p o rt C o u p l i n g a tte n u a ti o n 1 P ro ce d u re E x p re s s i o n o f re s u l ts T e s t re p o rt 4 B a l u n l e s s p ro c e d u re An n e x A ( n o rm a ti ve ) International Electrotechnical Commission D e te rm i n a ti o n o f th e i m p e d a n ce o f th e i n n e r c i rc u i t I EC 621 53-4-7: 201 © I EC 201 – – An n e x B ( i n fo rm a ti ve ) E xa m p l e o f a s e l f- m a d e i m p e d a n c e m a tch i n g a d a p te r An n e x C ( i n fo rm a ti ve ) M e a s u re m e n ts o f th e s cre e n i n g e ffe cti ve n e s s o f co n n e c to rs a n d ca b l e a s s e m b l i e s C G e n e l C P h ys i c a l b a s i cs C G e n e l c o u p l i n g e q u a ti o n C 2 C o u p l i n g tra n s fe r fu n cti o n C T ri a x i a l te s t s e t- u p 3 C G e n e l 3 C M e a s u re m e n t o f c a b l e a s s e m b l i e s C 3 C M e a s u re m e n t o f c o n n e c to rs Con cl u s i on 38 An n e x D ( i n fo rm a ti ve ) I n fl u e n c e o f c o n ta ct re s i s ta n ce s B i b l i o g p h y F i g u re – D e fi n i ti o n o f ZT F i g u re – P ri n ci p l e o f th e te s t s e t - u p to m e a s u re tra n s fe r i m p e d a n ce a n d s cre e n i n g o r co u p l i n g a tte n u a ti o n o f c o n n e cto rs wi th tu b e i n tu b e 1 F i g u re – P ri n ci p l e o f th e te s t s e t - u p to m e a s u re tra n s fe r i m p e d a n ce a n d s cre e n i n g a tte n u a ti o n o f a c a b l e a s s e m b l y F i g u re – P ri n ci p l e s e t- u p fo r ve ri fi c a ti o n te s t F i g u re – P re p a ti o n o f b a l a n c e d o r m u l ti co n d u c to r co n n e c to rs F i g u re – T e s t s e t- u p ( p ri n ci p l e ) fo r tra n s fe r i m p e d a n c e m e a s u re m e n t a cc o rd i n g to te s t m e th o d B o f I E C - - F i g u re – M e a s u ri n g th e s cre e n i n g a tte n u a ti o n wi th tu b e i n tu b e wi th i m p e d a n c e m a tch i n g d e vi ce F i g u re – M e a s u ri n g th e co u p l i n g a tte n u a ti o n wi th tu b e i n tu b e a n d b a l u n F i g u re – T yp i c a l m e a s u re m e n t o f a co n n e c to r o f , m l e n g th wi th m e xte n s i o n tu b e F i g u re – M e a s u ri n g th e c o u p l i n g a tte n u a ti o n wi th m u l ti p o rt VN A ( b a l u n l e s s p ro c e d u re i s u n d e r c o n s i d e ti o n ) F i g u re B – Atte n u a ti o n a n d re tu rn l o s s o f a Ω to Ω im ped an ce m atch in g a d a p te r, l o g s ca l e F i g u re B – Atte n u a ti o n a n d re tu rn l o s s o f a Ω to Ω im ped an ce m atc h i n g a d a p te r, l i n s c a l e F i g u re C – E q u i va l e n t c i rc u i t o f c o u p l e d tra n s m i s s i o n l i n e s F i g u re C – S u m m i n g fu n c ti o n S F i g u re C – C a l c u l a te d co u p l i n g tra n s fe r fu n c ti o n ( l = m; e r1 = 2, 3; e r2 = 1; ZF = 0) 32 th e s c re e n i n g a tte n u a ti o n a and S ZT 3 F i g u re C – T ri a x i a l s e t- u p fo r th e m e a s u re m e n t o f th e tra n s fe r i m p e d a n c e F i g u re C – S i m u l a ti o n o f a c a b l e a s s e m b l y ( l o g a ri th m i c s c a l e ) F i g u re C – S i m u l a ti o n o f a c a b l e a s s e m b l y ( l i n e a r s c a l e ) F i g u re C – T ri a x i a l s e t- u p wi th e xte n s i o n tu b e fo r s h o rt c a b l e a s s e m b l i e s F i g u re C – T ri a x i a l s e t- u p wi th e xte n s i o n tu b e fo r co n n e c to rs F i g u re C – S i m u l a t i o n , l o g a ri th m i c fre q u e n c y s c a l e F i g u re C – M e a s u re m e n t , F i g u re C 1 – S i m u l a t i o n , International Electrotechnical Commission l o g a ri th m i c fre q u e n c y s c a l e l i n e a r fre q u e n c y s c a l e – F i g u re C – M e a s u re m e n t , F i g u re C – Si m u l ati o n , F i g u re C – s i m u l a ti o n , F i g u re D.1 – C o n t a c t re s i s ta n c e s F i g u re D.2 – E q u i v a l e n t c i rc u i t o f t h e Tabl e wi t h – I EC t ri a x i a l International Electrotechnical Commission 621 53, – IEC 21 53-4-7 : 20 © I EC 201 l i n e a r fr e q u e n c y s c a l e l o g a ri t h m i c fre q u e n c y s ca l e 38 l i n e a r fr e q u e n c y s c a l e o f th e te s t s e t- u p te s t s e t- u p M e ta l l i c c o m m u n i c a t i o n ca b l e te s t m e th o d s – T e s t p ro c e d u re s te s t s e t- u p 1 I EC 621 53-4-7: 201 © I EC 201 – – I N TE RN ATI O N AL E L E C TRO TE C H N I C AL C O M M I S S I O N M E T AL L I C C O M M U N I C ATI O N C AB LE TE S T M E TH O D S – P a rt -7 : E l e c tro m a g n e ti c co m p a ti b i l i ty (E M C ) – Te s t m e th o d fo r m e a s u ri n g o f tra n s fe r i m p e d a n c e Z T a n d s c re e n i n g a tte n u a ti o n a s o r co u p l i n g a tte n u a ti o n a C o f c o n n e c to rs a n d a s s e m b l i e s u p to a n d a b o ve G H z – Tri a xi a l tu b e i n tu b e m e th o d F O RE W O RD 1) T h e I n te rn a ti o n a l E l e c t ro t e c h n i c a l C o m m i s s i o n ( I E C ) i s a wo rl d wi d e o rg a n i z a ti o n fo r s t a n d a rd i z a t i o n c o m p ri s i n g al l n a ti o n a l e l e c tro t e c h n i c a l c o m m i t te e s (I E C N ati o n a l C o m m i tt e e s ) Th e o bj ect of I EC is to p ro m o te i n te rn a ti o n a l c o - o p e t i o n o n a l l q u e s t i o n s c o n c e rn i n g s t a n d a rd i za t i o n i n t h e e l e c t ri c a l a n d e l e c tro n i c fi e l d s T o th i s en d and Te ch n i ca l in a d d i ti o n Re p o rts , to o t h e r a c ti vi ti e s , P u bl i cl y Ava i l a b l e IEC pu bl i sh es S p e c i fi c a t i o n s I n te rn a ti o n a l (P AS ) an d S ta n d a rd s , G u i d es T e ch n i ca l ( h e re a ft e r S p e c i fi c a t i o n s , re fe rre d to as “I EC P u b l i c a ti o n ( s ) ” ) T h e i r p re p a t i o n i s e n t ru s t e d t o t e c h n i c a l c o m m i tte e s ; a n y I E C N a ti o n a l C o m m i tte e i n t e re s t e d in th e s u bj ect d eal t wi t h m ay p a rt i c i p a t e in th i s p re p a t o ry wo rk I n t e rn a ti o n a l , g o ve rn m e n t a l an d n on - g o v e rn m e n t a l o rg a n i z a ti o n s l i a i s i n g wi th th e I E C a l s o p a rti c i p a te i n t h i s p re p a ti o n I E C c o l l a b o te s c l o s e l y wi t h th e I n te rn a t i o n a l O rg a n i z a ti o n fo r S t a n d a rd i z a ti o n (I S O) in a c c o rd a n c e wi t h d i ti on s d e te rm i n e d by a g re e m e n t b e t we e n th e t wo o rg a n i za ti o n s 2) T h e fo rm a l d e c i s i o n s o r a g re e m e n ts o f I E C o n t e c h n i c a l m a t te rs e xp re s s , a s n e a rl y a s p o s s i b l e , a n i n t e rn a ti o n a l s en s u s of opi n i on on th e re l e v a n t s u b j e cts s i n ce e a ch te ch n i ca l c o m m i tte e has re p re s e n ta ti o n fro m al l i n te re s te d I E C N a ti o n a l C o m m i t te e s 3) I E C P u b l i c a t i o n s h a ve th e fo rm o f re c o m m e n d a t i o n s fo r i n t e rn a ti o n a l u s e a n d a re a c c e p t e d by I E C N ati o n a l C o m m i tt e e s i n th a t s e n s e W h i l e a l l re a s o n a b l e e ffo rt s a re m a d e t o e n s u re th a t t h e t e c h n i c a l c o n t e n t o f I E C P u b l i c a ti o n s is a c c u te , IEC can n ot be h el d re s p o n s i b l e fo r th e wa y in wh i c h th ey a re u sed or fo r an y m i s i n t e rp re t a t i o n b y a n y e n d u s e r 4) In o rd e r t o p ro m o te t n s p a re n t l y to i n te rn a t i o n a l th e m a xi m u m u n i fo rm i ty, e xt e n t I EC possi bl e N a ti o n a l in th e i r C o m m i tt e e s n a ti on al an d u n d e rta ke re g i o n a l to appl y I EC p u b l i c a ti o n s P u b l i ca ti o n s An y d i v e rg e n c e b e t we e n a n y I E C P u b l i c a ti o n a n d t h e c o rre s p o n d i n g n a ti o n a l o r re g i o n a l p u b l i c a t i o n s h a l l b e c l e a rl y i n d i c a te d i n t h e l a tt e r 5) I E C i t s e l f d o e s n o t p ro vi d e a n y a tt e s ta ti o n o f c o n fo rm i ty a s s e s s m e n t s e rvi c e s a n d , i n s o m e a re a s , I n d e p e n d e n t c e rti fi c a t i o n b o d i e s p ro vi d e c o n fo rm i t y a c c e s s t o I E C m a rk s o f c o n fo rm i ty I E C i s n o t re s p o n s i b l e fo r a n y s e rvi c e s c a rri e d o u t b y i n d e p e n d e n t c e rt i fi c a t i o n b o d i e s 6) 7) Al l u s e rs s h o u l d e n s u re th a t t h e y h a v e t h e l a t e s t e d i ti o n o f th i s p u b l i c a ti o n N o l i a b i l i t y s h a l l a t t a c h to I E C o r i ts d i re c to rs , e m p l o y e e s , s e rva n t s o r a g e n ts i n c l u d i n g i n d i vi d u a l e xp e rts a n d m e m b e rs o f i t s t e c h n i c a l c o m m i tt e e s a n d I E C N a ti o n a l C o m m i t te e s fo r a n y p e rs o n a l i n j u ry, p ro p e rty d a m a g e o r oth e r d am ag e e xp e n s e s of a n y a ri s i n g ou t n a tu re wh a t s o e v e r, wh e th e r d i re c t of p u b l i c a ti o n , u se th e o f, or o r i n d i re c t , re l i a n c e u pon, o r fo r c o s t s th i s I EC (i n cl u d i n g P u b l i c a ti o n or l eg al fe e s ) and any o th e r I EC P u b l i ca ti o n s 8) Atte n ti o n i s d wn t o th e N o rm a t i ve re fe re n c e s c i t e d i n t h i s p u b l i c a t i o n U s e o f t h e re fe re n c e d p u b l i c a ti o n s i s i n d i s p e n s a b l e fo r th e c o rre c t a p p l i c a ti o n o f th i s p u b l i c a t i o n 9) Atte n ti o n i s d wn to th e p o s s i b i l i t y th a t s o m e o f th e e l e m e n ts o f th i s I E C P u b l i c a ti o n m a y b e t h e s u b j e c t o f p a te n t ri g h t s I E C s h a l l n o t b e h e l d re s p o n s i b l e fo r i d e n t i fyi n g a n y o r a l l s u c h p a t e n t ri g h ts I n te rn a ti o n a l Cabl es, S ta n d a rd wi re s , I EC 621 53-4-7 wa ve g u i d e s , R F h as been co n n e c to rs , p re p a re d R F and by I EC te ch n i c a l co m m i tte e 46: m i cro wa ve p a s s i ve co m p o n e n ts a n d a cce s s o ri e s Th i s s e co n d e d i ti o n ca n ce l s an d re p l a ce s th e fi rs t e d i ti o n pu bl i sh ed in 2006 Th i s e d i ti o n co n s ti tu te s a te c h n i c a l re vi s i o n T h i s e d i ti o n i n c l u d e s th e fo l l o wi n g s i g n i fi c a n t te c h n i c a l c h a n g e s wi th re s p e ct to th e p re vi o u s e d i ti o n : T h e d o cu m e n t i s re vi s e d a n d u p d a te d T h e c h a n g e s o f th e re vi s e d I E C - - : , a n d I E C - - : , a re i n cl u d e d International Electrotechnical Commission – – M e a s u re m e n ts ca n be a ch i e ve d n ow wi th I E C 21 53-4-7 : 20 © I E C 201 m i s m a tch at th e g e n e to r s i te , i m pe d an ce m a tch i n g d e vi ce s a re n o t n e ce s s a ry T h e te xt o f th i s s ta n d a rd i s b a s e d o n th e fo l l o wi n g d o cu m e n ts : FDI S Re p o rt o n v o t i n g /5 /F D I S /5 /RV D F u l l i n fo rm a ti o n o n th e vo ti n g fo r th e a p p ro va l o f th i s s ta n d a rd c a n b e fo u n d i n th e re p o rt o n vo ti n g i n d i c a te d i n th e a b o ve ta b l e T h i s p u b l i c a ti o n h a s b e e n d fte d i n a cc o rd a n c e wi th th e I S O /I E C D i re cti ve s , P a rt A l i s t of al l p a rts o f th e I E C s e ri e s , cable test methods u n d e r th e g e n e l ti tl e : , c a n b e fo u n d o n th e I E C we b s i te Metallic communication T h e co m m i tte e h a s d e ci d e d th a t th e c o n te n ts o f th i s p u b l i ca ti o n wi l l re m a i n u n c h a n g e d u n ti l th e s ta b i l i t y d a te i n d i ca te d on th e I EC we b s i te u n d er " h ttp : //we b s to re i e c c h " in th e d a ta re l a te d to th e s p e c i fi c p u b l i ca ti o n At th i s d a te , th e p u b l i c a ti o n wi l l b e • re co n fi rm e d , • wi th d wn , • re p l a c e d b y a re vi s e d e d i ti o n , o r • am en d ed A b i l i n g u a l ve rs i o n o f th i s p u b l i c a ti o n m a y b e i s s u e d a t a l a te r d a te I M P O RT AN T th at it – u n d e rs t a n d i n g c o l o u r p ri n t e r International Electrotechnical Commission Th e co n ta i n s of ' co l ou r c o l o u rs i ts in si d e' wh i ch c o n te n ts l og o a re U s e rs on th e cover c o n s i d e re d sh ou l d p ag e to t h e re fo re of th i s be p ri n t p u b l i cati on u s e fu l th i s fo r i n d i c a te s th e d o cu m e n t c o rre c t u sing a I EC 621 53-4-7: 201 © I EC 201 – – I N TRO D U C TI O N Th e shi el ded s cre e n i n g a tte n u a ti o n te s t s e t- u p a cco rd i n g to I EC 62 53-4-3 an d I E C - - h a ve b e e n e xte n d e d to ta ke i n to a cco u n t th e p a rti c u l a ri ti e s o f e l e c tri c a l l y s h o rt e l e m e n ts l i ke co n n e c to rs an d ca b l e assem bl i es Du e to th e c o n c e n tri c o u te r tu b e of th e tri a x i a l s e t- u p , m e a s u re m e n ts a re i n d e p e n d e n t o f i rre g u l a ri ti e s o n th e c i rc u m fe re n c e a n d o u te r e l e c tro m a g n e ti c fi e l d s W i th th e u s e o f a n a d d i ti o n a l re s o n a to r tu b e ( i n n e r tu b e re s p e c ti ve l y tu b e i n tu b e ) , a s ys te m i s cre a te d wh e re th e s cre e n i n g e ffe cti ve n e s s of an e l e ctri c a l l y s h o rt d e vi ce is m e a s u re d in re a l i s ti c a n d c o n tro l l e d c o n d i ti o n s Al s o a l o we r cu t o ff fre q u e n c y fo r th e tra n s i ti o n b e twe e n e l e c tri ca l l y s h o rt ( tra n s fe r i m p e d a n c e Z T ) a n d e l e ctri c a l l y l o n g ( s cre e n i n g a tte n u a ti o n aS) can b e a ch i e ve d A wi d e d yn a m i c a n d fre q u e n c y n g e ca n b e a p p l i e d to te s t e ve n s u p e r s c re e n e d c o n n e cto rs a n d a s s e m b l i e s wi th n o rm a l i n s tru m e n ta ti o n fro m l o w fre q u e n c i e s u p to th e l i m i t o f d e fi n e d tra n s ve rs a l wa ve s i n th e o u te r c i rc u i t a t a p p ro x i m a te l y G H z International Electrotechnical Commission – – I E C 21 53-4-7 : 20 © I E C 201 M E T AL L I C C O M M U N I C ATI O N C AB LE TE S T M E TH O D S – P a rt -7 : E l e c tro m a g n e ti c co m p a ti b i l i ty (E M C ) – Te s t m e th o d fo r m e a s u ri n g o f tra n s fe r i m p e d a n c e Z T a n d s c re e n i n g a tte n u a ti o n a s o r co u p l i n g a tte n u a ti o n a C o f c o n n e c to rs a n d a s s e m b l i e s u p to a n d a b o ve G H z – Tri a xi a l tu b e i n tu b e m e th o d S co p e T h i s tri a x i a l m e th o d i s s u i ta b l e to d e te rm i n e th e s u rfa c e tra n s fe r i m p e d a n c e a n d /o r s cre e n i n g a tte n u a ti o n a n d c o u p l i n g a tte n u a ti o n o f m a te d s cre e n e d c o n n e c to rs ( i n c l u d i n g th e co n n e cti o n b e twe e n c a b l e a n d co n n e cto r) a n d ca b l e a s s e m b l i e s T h i s m e th o d co u l d a l s o b e e xte n d e d to d e te rm i n e th e tra n s fe r i m p e d a n c e , c o u p l i n g o r s cre e n i n g a tte n u a ti o n o f b a l a n ce d o r m u l ti p i n co n n e cto rs a n d m u l ti c o re ca b l e a s s e m b l i e s F o r th e m e a s u re m e n t o f tra n s fe r i m p e d a n c e a n d s cre e n i n g - o r c o u p l i n g a tte n u a ti o n , o n l y o n e te s t s e t- u p i s n e e d e d N o rm a ti ve re fe re n ce s T h e fo l l o wi n g d o c u m e n ts , i n wh o l e o r i n p a rt, a re n o rm a ti ve l y re fe re n ce d i n th i s d o c u m e n t a n d a re i n d i s p e n s a b l e fo r i ts a p p l i ca ti o n F o r d a te d re fe re n ce s , o n l y th e e d i ti o n c i te d a p p l i e s F o r u n d a te d re fe re n ce s , th e l a te s t e d i ti o n of th e re fe re n ce d d ocu m en t (i n cl u d i n g an y a m e n d m e n ts ) a p p l i e s I E C T S - - , Metallic communication cable test methods – Part 4-1 : Electromagnetic compatibility (EMC) – Introduction to electromagnetic screening measurements Metallic communication cable test methods – Part 4-3: Electromagnetic Compatibility (EMC) − Surface transfer impedance − Triaxial method I EC 621 53-4-3, I E C - - , Metallic communication cable test methods – Part 4-4: Electromagnetic compatibility (EMC) – Shielded screening attenuation, test method for measuring of the screening attenuation as up to and above GHz Metallic communication cable test methods – Part 4-1 5: Electromagnetic compatibility (EMC) – Test method for measuring transfer impedance and screening attenuation – or coupling attenuation with Triaxial Cell I E C 21 53-4-1 5, Te rm s a n d d e fi n i ti o n s F o r th e p u rp o s e s o f th i s d o c u m e n t, th e fo l l o wi n g te rm s a n d d e fi n i ti o n s a p p l y s u rfa c e t n s fe r i m p e d a n c e Z T fo r a n e l e ctri c a l l y s h o rt s cre e n , ci rc u i t b y th e c u rre n t N o te t o e n t ry: N o te to e n t ry: Ω I2 U1 i n d u c e d to th e i n n e r T h e s u rfa c e t n s fe r i m p e d a n c e i s e xp re s s e d i n o h m s Th e va l u e ZT N o te t o e n t ry: S e e F i g u re International Electrotechnical Commission q u o ti e n t o f th e l o n g i tu d i n a l vo l ta g e fe d i n to th e o u te r c i rc u i t o r vi c e ve rs a , s e e fi g u re o f a n e l e c t ri c a l l y s h o rt s c re e n i s e xp re s s e d i n o h m s [ Ω] o r d e c i b e l s i n re l a ti o n t o – 30 – I E C 621 53-4-7 : 20 © I E C 20 P P 2n Z 2n 2f U Z; ε r2 ; V U Z U1 Z; ε r1 ; V U Z 2 2f 2f Z 1n 1f 1f P IEC Ke y P0 s q u a re ro o t o f t h e fe e d i n g p o w e r P2 n P2 f s q u a re ro o t o f th e c o u p l e d p o we r, n e a r e n d s q u a re ro o t o f t h e c o u p l e d p o we r, fa r e n d Zn m m a tc h i n g re s i s to rs , = p ri m a ry c i rc u i t, = s e c o n d a ry c i rc u i t , n = n e a r e n d , f = fa r e n d Zn c h a c te ri s t i c i m p e d a n c e , = p ri m a ry c i rc u i t , = s e c o n d a ry c i rc u i t ε d i e l e c tri c c o n s ta n t , = p ri m a ry c i rc u i t , = s e c o n d a ry c i rc u i t rn ve l o c i t y o f p ro p a g a ti o n , = p ri m a ry c i rc u i t , = s e c o n d a ry c i rc u i t F i g u re C – E q u i v a l e n t c i rc u i t o f c o u p l e d F i g u re C s h o ws th e s u m m i n g fu n cti o n wh i c h is in t n s m i s s i o n p ri n c i p l e a s i n li nes ( x) /x fu n c ti o n F or h i g h fre q u e n c i e s , th e a s ym p to ti c va l u e b e co m e s : S n → (β f ) ± β2 ⋅ l (C 3) An d fo r l o w fre q u e n c i e s th e s u m m i n g fu n cti o n b e - co m e s : S n f International Electrotechnical Commission →1 (C 4) I EC 621 53-4-7: 201 © I EC 201 – 31 – S l og scal e S S n l f) cn ( × f ( l × f) cf l f) l og ( × F i g u re C – S u m m i n g fu n c t i o n IEC S T h e p o i n t o f i n te rs e c ti o n b e twe e n th e a s ym p to ti c va l u e s fo r l o w a n d h i g h fre q u e n c i e s i s th e s o ca l l e d c u t- o ff fre q u e n c y fc T h i s fre q u e n c y g i ve s th e c o n d i ti o n fo r e l e c tri ca l l o n g s a m p l e s : f c, n ⋅ c0 l≥ e1 π⋅ f r ± (C 5) e2 r wh e re e r1 i s th e re l a ti ve d i e l e c tri c p e rm i tti vi t y o f th e i n n e r s ys te m ; e r2 i s th e re l a ti ve d i e l e c tri c p e rm i tti vi t y o f th e o u te r s ys te m ; l s th e c a b l e l e n g th C 2 C o u p l i n g t n s fe r fu n c t i o n C 2 H o m o g e n o u s s c re e n s T h e p ri m a ry s cre e n i n g q u a n ti ti e s o f a s cre e n a re th e s u rfa c e tra n s fe r i m p e d a n ce ca p a c i ti ve c o u p l i n g i m p e d a n c e s cre e n s s u c h ZF o r th e e ffe cti ve tra n s fe r i m p e d a n c e a s fo r co n n e c to rs o r ca b l e s , th e y ca n be assu m ed ZT E ZT a n d th e For h om og en e ou s to b e co n s ta n t a l o n g th e l e n g th T h e i n te g ti o n c o u l d th e n b e e a s i l y s o l ve d T h e co u p l i n g b e twe e n th e s a m p l e a n d th e s u rro u n d i n g c o u l d b e e x p re s s e d b y th e fo l l o wi n g c o u p l i n g tra n s fe r fu n c ti o n F o r m a tc h e d l i n e s i t i s [3 ] [ ] : T s, n = (ZF ± Z T )⋅ f F o r l o w fre q u e n c i e s , wh e n S ⋅ l Z1 ⋅ Z2 ⋅ S (C 6) n f = , th e co u p l i n g tra n s fe r fu n c ti o n co rre s p o n d s to th e fre q u e n c y b e h a vi o u r o f th e s u rfa ce tra n s fe r i m p e d a n c e a n d ca p a c i ti ve co u p l i n g i m p e d a n ce Afte r a ri s e wi th d B p e r d e c a d e , th e c o u p l i n g tra n s fe r fu n c ti o n s h o ws d i ffe re n t c u t- o ff fre q u e n c i e s fo r th e n e a r a n d fa r e n d Ab o ve th e s e cu t- o ff fre q u e n ci e s , th e s a m p l e s fc n , f a re c o n s i d e re d as e l e c tri ca l l y l o n g Th e ca l c u l a te d cou p l i n g tra n s fe r fu n cti o n of a co a x i a l ca b l e is p ri n c i p l e s e t- u p o f th e tri a x i a l te s t p ro c e d u re i s g i ve n i n F i g u re C International Electrotechnical Commission g i ve n in F i g u re C Th e – 32 – I E C 621 53-4-7 : 20 © I E C 20 Tf Tn kH z 00 kH z MHz MHz fcf fcn F i g u re C – C a l cu l a t e d co u p l i n g t n s fe r fu n ct i o n ( B el ow th e cu t- o ff fre q u e n c i e s , th e s u rfa c e tra n s fe r GH z GH z IEC l=1 e m; = 2, 3; ZT i m p e d a n ce ZT s cre e n i n g e ffe cti ve n e s s T h e va l u e o f th e tra n s fe r i m p e d a n c e r1 is e th e r2 Z = 1; F m e a s u re = 0) of th e i n cre a s e s wi th th e s a m p l e l e n g th Ab o ve th e cu t- o ff fre q u e n c i e s in th e n g e o f wa ve p ro p a g a ti o n , wh e re th e s a m p l e s a re e l e ctri c a l l y l o n g , th e s cre e n i n g a tte n u a ti o n re s p e c ti ve l y i n aS th e n g e i s th e p a m e te r fo r th e s cre e n i n g e ffe cti ve n e s s T h e s cre e n i n g a tte n u a ti o n i s a l e n g th - i n d e p e n d e n t q u a n ti t y C 2 C a b l e a s s e m b l y s cre e n s C a b l e a s s e m b l i e s a re co m p o s e d b y th e c a b l e i ts e l f a n d a c o n n e cto r a t e a ch e n d I n a d d i ti o n to th e c o u p l i n g o f th e c o m p o n e n ts i ts e l f, th e c o u p l i n g o f th e tra n s i ti o n b e twe e n cab l e and co n n e cto r a l s o s h o u l d b e ta ke n i n to a cc o u n t M o u n ti n g a g o o d co n n e c to r to a g o o d c a b l e wi l l n o t a u to m a ti c a l l y l e a d to a g o o d a s s e m b l y b e c a u s e th e c o n n e cti o n b e twe e n th e c a b l e a n d th e co n n e cto r m a y b e wo rs e E a ch p a rt sam pl e, of i t i e h as on e a d i ffe re n t s e cti o n fo r cou p l i n g , e ach th u s one com pon e n t h as to ( co n n e cto r i n te g te A, in s e cti o n s tra n s i ti o n , ca b l e , alon g th e tra n s i ti o n , co n n e cto r B ) I n a fi rs t a p p ro a c h , th e ve l o ci t y i n e a c h s e c ti o n c o u l d b e a s s u m e d to b e e q u a l T h e c o u p l i n g tra n s fe r fu n cti o n fo r m a tc h e d l i n e s i s th e n e x p re s s e d b y: T n T f = = γ1 + γ e −γ  n Lc γ1 − γ  ⋅ ∑ i=    n ⋅ ∑  i=   Z F, Z Z i ⋅e Z ⋅Z i + 1 i−  ∑ Li k= ⋅ ( ⋅ ( − e − (γ + γ )⋅ T, − (γ − γ i− − e − (γ − γ )⋅ 1 Li  )    wh e re γ1 , i s th e co m p l e x wa ve p ro p a g a ti o n c o n s ta n t o f i n n e r, re s p e cti ve l y o u te r c i rc u i t; Lc i s th e wh o l e co u p l i n g l e n g th ( s u m o f th e s e g m e n t l e n g th s ) ; Li i s th e l e n g th o f s e g m e n t n i s th e n u m b e r o f s e g m e n ts ( fo r c a b l e a s s e m b l i e s , ) ; Tn , f i s th e co u p l i n g tra n s fe r fu n cti o n a t th e n e a r re s p e c ti ve l y fa r e n d ; International Electrotechnical Commission (C 7)  ) ⋅ ∑ Li k= Li  )    Z i ⋅e Z ⋅Z − F,i T, − (γ + γ )⋅ i; (C 8) I EC 621 53-4-7: 201 © I EC 201 – 33 – Z1 , i s th e ch a cte ri s ti c i m p e d a n c e o f i n n e r, re s p e cti ve l y o u te r c i rc u i t; ZF i s th e ca p a c i ti ve c o u p l i n g i m p e d a n ce ; ZT i s th e s u rfa ce tra n s fe r i m p e d a n c e ; γ i s th e p ro p a g a ti o n c o n s ta n t = ( α + j β ) , wh e re α i s th e a tte n u a ti o n co n s ta n t a n d β i s th e p h a s e c o n s ta n t C 2 C o u p l i n g i n t h e t ri a xi a l s e t -u p T h e a b o ve - m e n ti o n e d co u p l i n g tra n s fe r fu n cti o n s a re va l i d i f th e p ri m a ry a n d s e c o n d a ry c i rc u i t a re m a tch e d m i s m a tch e d H o we ve r, (see also in th e th e tri a x i a l fo l l o wi n g s e t- u p , s e cti o n ) th e At s e c o n d a ry s ys te m n ear on e th e en d , ( o u te r has th e c i rc u i t) s h o rt is c i rc u i t b e twe e n th e s a m p l e s cre e n At th e fa r e n d , o n e h a s th e m i s m a tc h b e twe e n th e i m p e d a n c e o f th e o u te r c i rc u i t a n d th e re ce i ve r i n p u t i m p e d a n c e re s u l ti n g i n th e re fl e cti o n c o e ffi c i e n t r , f In th i s ca s e , th e re s u l ti n g c o u p l i n g tra n s fe r fu n c ti o n ( a t th e re c e i ve r e n d ) i s o b ta i n e d b y: T* = (T − T ⋅ e f −γ LC n )⋅ + r2 , f − 2γ L + r2 , f ⋅ e (C 9) C wh e re γ2 i s th e co m p l e x wa ve p ro p a g a ti o n c o n s ta n t o f o u te r ci rc u i t; Lc i s th e wh o l e co u p l i n g l e n g th ( s u m o f th e s e g m e n t l e n g th s ) ; r2 , f i s th e re fl e c ti o n co e ffi c i e n t; Tn , f i s th e co u p l i n g tra n s fe r fu n cti o n a t th e n e a r re s p e c ti ve l y fa r e n d C Tri a xi a l te s t s e t-u p C G e n e l T h e tri a x i a l te s t s e t- u p i s o n e o f th e c l a s s i c a l m e th o d s to m e a s u re th e tra n s fe r i m p e d a n ce a n d h as been re ce n tl y e x te n d e d fo r th e m e a s u re m e n t of th e s cre e n i n g a tte n u a ti o n of ca b l e s cre e n s [1 ] T h e tri a x i a l s e t- u p i s d e s cri b e d i n I E C - - a n d I E C - - a n d c o n s i s ts o f a tu b e o f b s s o r a l u m i n i u m wi th a n i n n e r d i a m e te r o f a b o u t m m S creen Gen erator Tu be u n d er test M atch i n g resi stor R1 = Z1 Recei ver Screen i n g case F i g u re C – T ri a xi a l s e t -u p fo r th e m e a s u re m e n t o f th e s c re e n i n g a tte n u a t i o n a S a n d th e tra n s fe r i m p e d a n c e IEC Z T F o r th e m e a s u re m e n t o f th e tra n s fe r i m p e d a n c e ( e l e c tri ca l l y s h o rt c o u p l i n g l e n g th ) , th e tu b e l e n g th i s , m to co u p l i n g l e n g th ) , m F o r th e m e a s u re m e n t o f th e s cre e n i n g a tte n u a ti o n ( e l e c tri ca l l y l o n g th e m e a s u ri n g tu b e i s e xte n d e d to a l e n g th o f m to m ( S e e a l s o th e a b o ve th e o re ti c a l e xp l a n a ti o n ) I n th e o u te r c i rc u i t, a t t h e n e a r e n d , th e s cre e n u n d e r te s t i s s h o rt ci rc u i te d wi th th e m e a s u ri n g tu b e Th e International Electrotechnical Commission e l e ctri c a l wa ve s , wh i c h a re c o u p l e d o ve r th e wh o l e cab l e l e n g th fro m th e in ner – 34 – I E C 621 53-4-7 : 20 © I E C 20 s ys te m i n to th e o u te r s ys te m , p ro p a g a te i n b o th d i re c ti o n s , to th e n e a r a n d to th e fa r e n d At th e s h o rt c i rc u i te d end, th e y a re to ta l l y re fl e cte d , so th a t at th e m e a s u ri n g re c e i ve r, th e s u p e rp o s i ti o n o f n e a r a n d fa r e n d c o u p l i n g ca n b e m e a s u re d a s th e d i s tu rb a n c e vo l ta g e ti o U U / Th e s cre e n i n g a tte n u a ti o n as a p o we r Z ch a c te ri s ti c i m p e d a n c e o f th e o u te r s ys te m a s U = 20 log   U1 s ti o = 50 is th e n   + log  ⋅ Z  Z   max  C a s ta n d a rd i s e d (C 0) Z i s th e ch a cte ri s ti c i m p e d a n c e o f th e s a m p l e u n d e r te s t a n d to    s wh e re Z re l a te d Ω s is 50 Ω M e a s u re m e n t o f c a b l e a s s e m b l i e s C G e n e l W h e n m e a s u ri n g ca b l e a s s e m b l i e s i n th e tri a x i a l te s t s e t- u p , th e re i s th e p ro b l e m i n th a t th e i r l e n g th s d i ffe r wi d e l y a n d a re e i th e r s h o rte r o r l o n g e r th a n th e c o m m o n l y u s e d m e a s u ri n g tu b e o f m o r m H o we ve r, th e i n ve s ti g a ti o n s o f th e a b o ve - g i ve n co u p l i n g fu n c ti o n s s h o w th a t: a) fo r a s s e m b l i e s l o n g e r th a n th e m e a s u ri n g tu b e , i t i s s u ffi ci e n t e n o u g h to m e a s u re j u s t b o th a cce s s i b l e a s s e m b l y e n d s ; b) fo r a s s e m b l i e s s h o rte r th a n th e m e a s u ri n g tu b e , o n e c a n e x te n d th e a s s e m b l y b y a we l l s cre e n e d c a b l e i n s i d e a cl o s e d c o p p e r tu b e T h i s i s th e s o c a l l e d tu b e i n tu b e m e th o d C 2 In As s e m b l y l o n g e r t h a n s cre e n i n g a tte n u a ti o n t h e m e a s u ri n g t u b e m e a s u re m e n ts o f ca b l e a s s e m b l i e s , i t i s e vi d e n t th a t th e re s u l t i s ch a c te ri s e d b y th e we a ke s t p a rt E i th e r th e c a b l e o r th e c o n n e cto r o r th e tra n s i ti o n b e twe e n ca b l e a n d co n n e cto r T h u s , fo r c a b l e a s s e m b l i e s wh i c h a re l o n g e r th a n th e m e a s u ri n g tu b e , i t i s s u ffi ci e n t e n o u g h to m e a s u re th e a s s e m b l y fro m b o th e n d s ( p ro vi d e d th a t th e c a b l e s cre e n i s h o m o g e n o u s ) T h e wo rs t ca s e o f b o th m e a s u re m e n ts i s th e n th e s cre e n i n g a tte n u a ti o n o f th e wh o l e a s s e m b l y Th e s i m u l a te d g p h s g i ve n in F i g u re s e vi d e n ce T h e s i m u l a ti o n p a m e te rs a re : a) b) c) d) ca b l e s cre e n l e n g th : 0 cm d c re s i s ta n ce : 13 m m a g n e ti c c o u p l i n g : , m H /m ca p a c i ti ve c o u p l i n g : , p F /m Ω /m co n n e cto r s c re e n i n cl u d i n g tra n s i ti o n fro m ca b l e to c o n n e cto r l e n g th : cm d c re s i s ta n ce : m m a g n e ti c c o u p l i n g : 0, 002 m H ca p a c i ti ve c o u p l i n g : p F /m Ω /m o u te r c i rc u i t ( s e c o n d a ry s ys te m ) i m pe d a n ce: 50 d i e l e ctri c p e rm i tti vi t y: ,1 Ω i n n e r c i rc u i t ( p ri m a ry s ys te m ) i m pe d a n ce: International Electrotechnical Commission 50 Ω C an d C u n d e rl i n e th a t I EC 621 53-4-7: 201 © I EC 201 – 35 – d i e l e ctri c p e rm i tti vi t y: 2, 0 assy cm pl assy cm pl 1 assy part 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 00 00 0, 1 47 47 000 00 assy part mi n 20 000 500 500 000 500 000 IEC IEC F i g u re C – S i m u l a ti o n o f a c a b l e a s s e m b l y F i g u re C – S i m u l a ti o n o f a c a b l e a s s e m b l y ( l o g a ri th m i c s ca l e ) (l i n ear scal e) T h e b l u e l i n e s h o ws th e re s u l t o f th e co m p l e te c a b l e a s s e m b l y, i e 0 cm ca b l e a n d b o th co n n e cto rs T h e re d l i n e s h o ws th e re s u l t fo r j u s t o n e p a rt o f th e a s s e m b l y, i e cm o f th e ca b l e a n d o n e c o n n e cto r I n th e l o we r fre q u e n c y n g e , wh e re th e s a m p l e s a re e l e ctri c a l l y s h o rt, o n e g e ts a l e n g th d e p e n d e n t re s u l t H o we ve r i n th e h i g h e r fre q u e n c y n g e , wh e re th e sam pl es a re e l e c tri ca l l y l o n g , on e g e ts th e sam e minimum va l u e , i e th e s a m e s cre e n i n g a tte n u a ti o n o f d B C 3 As s e m b l y s h o rt e r th a n th e m e a s u ri n g tu b e W h e n th e a s s e m b l y i s s h o rte r th a n th e m e a s u ri n g tu b e , th e a s s e m b l y c a n b e e xte n d e d b y a we l l s cre e n e d co n n e cti n g ca b l e i n si d e a cl os e d co p p e r tu b e Th e so ca l l e d tu b e in tu b e m e th o d ( s e e a l s o F i g u re s C a n d C ) Th e e xte n s i o n tu b e th e n a cts as a re s o n a to r Th e sam e p ri n c i p l e is also used fo r th e m e a s u re m e n t o f co n n e cto rs F u rth e r d e ta i l s ca n b e o b ta i n e d fro m th e fo l l o wi n g e x p l a n a ti o n o f th e m e a s u re m e n t o f co n n e cto rs C 3 M e a s u re m e n t o f co n n e cto rs C 3 U su al G e n e l RF c o n n e cto rs h a ve m e ch a n i c a l d i m en si on s in th e l o n g i tu d i n a l axi s in th e n g e of m m to m m W i th th e d e fi n i ti o n o f e l e ctri c a l l o n g e l e m e n ts , we g e t cu t - o ff fre q u e n c i e s o f a b o u t G H z o r h i g h e r fo r s ta n d a rd RF - c o n n e cto rs Ab o ve th a t fre q u e n c y, th e y a re c o n s i d e re d to b e e l e ctri c a l l y l o n g T h e s cre e n i n g a tte n u a ti o n i s b y d e fi n i ti o n o n l y va l i d i n th e fre q u e n c y n g e a b o ve th e c u t - o ff fre q u e n c y, wh e re th e e l e m e n ts a re e l e ctri c a l l y l o n g T h u s th e s cre e n i n g a tte n u a ti o n o f a RF co n n e cto r i ts e l f c a n o n l y b e m e a s u re d a t fre q u e n c i e s a b o ve G H z H o we ve r, b y e xte n d i n g th e RF - c o n n e cto r b y a RF - ti g h t c l o s e d m e ta l l i c tu b e , a ca b l e a s s e m b l y wh i c h i s e l e c tri c a l l y l o n g i s b u i l t T h u s , th e c u t- o ff fre q u e n c y, re s p e c ti ve l y th e l o we r fre q u e n c y l i m i t, to co n n e cts m e a s u re th i s th e s cre e n i n g e xte n s i o n tu b e a tte n u a ti o n d i re ctl y to is th e e xte n d e d co n n e c to r to wa rd s u n d er l o we r fre q u e n ci e s te s t, on e is I f on e m e a s u ri n g th e s cre e n i n g a tte n u a ti o n o f th e co n n e c to r ( a n d i t’ s m a te d a d a p te r) I f o n e c o n n e c ts th e e xte n s i o n tu b e to th e c o n n e c ti n g c a b l e c l o s e to th e c o n n e c to r, o n e m e a s u re s th e s c re e n i n g a tte n u a ti o n o f th e c o m b i n a ti o n o f th e co n n e cto r ( a n d i ts m a te d a d a p te r) a n d th e tra n s i ti o n b e twe e n c a b l e a n d co n n e c to r ( s e e a l s o fi g u re s b e l o w) N O TE Al th o u g h th e c o n n e c to r i t s e l f s ta ys e l e c t ri c a l l y s h o rt, t h e c o m b i n a ti o n o f t h e c o n n e c to r a n d t h e e xt e n s i o n tu b e s h o ws th e b e h a vi o u r ( t h e s c re e n i n g a t te n u a t i o n ) o f t h e c o n n e c to r wh e n c o n n e c t e d t o a we l l s c re e n e d c a b l e , International Electrotechnical Commission – 36 – wh i c h h a s a s c re e n i n g e ffe c ti ve n e s s b e t t e r th a n I E C 621 53-4-7 : 20 © I E C 20 t h e o n e o f t h e c o n n e c t o r ( o r t h e t n s i t i o n b e t we e n ca b l e a n d c o n n e c t o r) S e e a l s o t h e e xp l a n a t i o n i n C Tu be Con n ector i n terface Assem bl y u n d er test Gen erator Recei ver Screen i n g cap Con n ecti n g cabl e E xten si on tu be IEC F i g u re C – T ri a xi a l s e t -u p wi th e xt e n s i o n tu b e fo r s h o rt c a b l e a s s e m b l i e s Con n ector u n d er test M ated ad apter Gen erator Recei ver S creen i n g cap E xten si on tu be M easu ri n g tu be IEC Con n ecti n g cabl e F i g u re C – T ri a xi a l s e t-u p wi th e xte n s i o n tu b e fo r co n n e cto rs C 3 M e a s u re m e n t s e t-u p F o r th e m e a s u re m e n t o f RF co n n e c to rs , re s p e c ti ve l y I EC 621 53-4-4 h as been th e tri a xi a l s e t - u p a cc o rd i n g to I E C I E C - - e xte n d e d by a RF - ti g h t cl o s e d m e ta l l i c tu b e ( s e e F i g u re ) T h e e xte n s i o n tu b e i s e i th e r c o n n e c te d to th e c o n n e c to r u n d e r te s t o r to th e s cre e n o f th e co n n e c ti n g ca b l e o f th e co n n e c to r u n d e r te s t At th e fa r e n d , th e co n n e c to r u n d e r te s t i s co n n e cte d to th e s cre e n i n g c a p o f th e tri a x i a l te s t s e t - u p vi a i ts m a te d a d a p te r T h e m e a s u re m e n t o f th e s cre e n i n g a tte n u a ti o n i ts e l f i s th e s a m e a s th e m e a s u re m e n t o f c a b l e s cre e n s a cc o rd i n g to I E C - - C 3 In a fi rs t M e a s u re m e n t re s u l ts a n d s i m u l a ti o n s a p p ro a ch , on e h as m e a s u re d s h o rt ca b l e pi eces i n s te a d of a co n n e c to r Th e a d va n ta g e i s th a t th e re s u l ts a re n o t i n fl u e n c e d b y a m a ti n g a d a p te r o r th e tra n s i ti o n b e twe e n ca b l e an d c o n n e c to r Th e ca b l e is a co a xi a l cab l e wi th an i m p e d a n ce of 75 Ω, fo a m PE d i e l e ctri c a n d a s i n g l e b i d s cre e n ( n o t o p ti m i s e d , i e u n d e r- b i d e d ) T h e s i m u l a ti o n s h a ve b e e n d o n e wi th th e e q u a ti o n s ( C ) , ( C ) a n d ( C ) wh e re th e n u m b e r o f s e cti o n s i s T h e fi rs t s e c ti o n i s th e c o n n e cti n g c a b l e wi th th e R F - ti g h t e xte n s i o n tu b e T h u s , th e tra n s fe r i m p e d a n c e a n d ca p a c i ti ve co u p l i n g i m p e d a n c e o f th a t s e cti o n i s n e g l e cte d T h e s e co n d s e cti o n i s th e c a b l e u n d e r te s t wi th fo l l o wi n g p a m e te r: Ω /m d c re s i s ta n ce : m m a g n e ti c c o u p l i n g : , m H /m ca p a c i ti ve c o u p l i n g : , p F /m i m pe d a n ce : 75 International Electrotechnical Commission Ω I EC 621 53-4-7: 201 © I EC 201 d i e l e ctri c p e rm i tti vi t y: Th e c o m p a ri s o n of – 37 – , 35 th e s i m u l a ti o n ( F i g u re s C 9, C 1 ) wi th th e m e a s u re m e n t re s u l ts ( F i g u re s C , C ) s h o w a g o o d c o rre s p o n d e n c e I n th e l o we r fre q u e n c y n g e , wh e n th e s a m p l e s a re e l e ctri c a l l y s h o rt, o n e g e ts th e s a m e re s u l ts H o we ve r i n th e h i g h e r fre q u e n c y n g e , o n e c a n s e e th e i n fl u e n c e o f th e e xte n s i o n tu b e T h e cm s a m p l e i s e l e c tri ca l l y s h o rt o ve r th e wh o l e fre q u e n c y n g e , a s th e c u t- o ff fre q u e n c y i s , G H z T h u s , th e co u p l e d p o we r i n cre a s e s wi th i n cre a s i n g co n n e cto r and th e fre q u e n c y e xte n s i o n tu b e is H o we ve r, th e e l e ctri c a l l y q u asi lon g ca b l e a b o ve a s s e m b l y co m p o s e d M H z, wh i ch o f th e re s u l ts in a co n s ta n t m a xi m u m co u p l e d p o we r O n e c h a c te ri s ti c o f a n e l e c tri ca l l y l o n g o b j e c t i s a l s o th a t th e m a xi m u m co u p l e d p o we r is in d epen d en t of th e sam pl e l e n g th (see C ) Th i s is u n d e rl i n e d i n F i g u re s C a n d C , wh e re th e s i m u l a te d re s u l ts o f a cm s a m p l e i n a m re s p e c ti ve l y m tu b e , i e wi th a cm , re s p e c ti ve l y cm e xte n s i o n tu b e , a re s h o wn T h e e n ve l o p e o f b o th c u rve s i s i d e n ti ca l 0 SB cm i n cm tu be SB cm i n m tu be 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 00 1 00 000 000 IEC 0, 10 00 000 F i g u re C – S i m u l a t i o n , F i g u re C – M e a s u r e m e n t , l o g a ri t h m i c fre q u e n c y s c a l e 000 IEC SB cm i n cm tube SB cm i n m tu be 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 00 00 500 000 F i g u re C 1 500 000 500 – S i m u l ati o n , l i n e a r fr e q u e n c y s c a l e 000 IEC SB cm i n cm tu be 10 20 International Electrotechnical Commission l o g a ri t h m i c fre q u e n c y s c a l e 10 0, SB cm i n m tu be 90 00 0, SB cm i n cm tu be 10 0, SB cm i n m tu be 500 000 500 000 500 F i g u re C – M e a s u re m e n t , l i n e a r fr e q u e n c y s c a l e 000 IEC – 38 – I E C 621 53-4-7 : 20 © I E C 20 SB cm i n m tube 10 20 20 30 30 40 40 50 50 60 60 70 70 80 80 90 90 00 00 0, 1 C 10 00 000 SB cm i n m tu be 10 SB cm i n m tu be 000 IEC 0, SB cm i n m tu be 500 000 500 000 500 F i g u re C – S i m u l a t i o n , F i g u re C – s i m u l a t i o n , l o g a ri t h m i c fre q u e n c y s c a l e l i n e a r fr e q u e n c y s c a l e 000 IEC C on cl u s i on C u s to m e rs and u s e rs o f RF ca bl es , cab l e assem bl i es an d c o n n e c to rs ask m o re o fte n fo r s cre e n i n g e ffe cti ve n e s s va l u e s i n d e c i b e l s ( d B ) i n s t e a d o f tra n s fe r i m p e d a n c e va l u e s i n m W re s p e c ti ve l y m W /m T h e tu b e i n tu b e m e th o d re p l y to th a t n e e d s i n c e i t o ffe rs a s i m p l e a n d re l i a b l e m e th o d to m e a s u re th e s cre e n i n g a tte n u a ti o n in dB of c o n n e c to rs an d ca b l e a s s e m b l i e s T h a t m e th o d i s a n e xte n s i o n o f th e s h i e l d e d s cre e n i n g a tte n u a ti o n ( l o n g tri a x i a l ) te s t s e t- u p a cc o rd i n g to I E C - - T h e c o m p a ri s o n o f th e m e a s u re d a n d th e c a l c u l a te d c u rve s s h o w g o o d c o n co rd a n c e T h e a d va n ta g e s o f th e tu b e i n tu b e m e th o d fo r c o n n e cto rs a n d a s s e m b l i e s a re th e s a m e a s fo r th e m e a s u re m e n t o f th e s cre e n i n g a tte n u a ti o n o f ca b l e s cre e n s i n th e tu b e : • s i m p l e a n d e a s y te s t s e t- u p ; • i n s e n s i ti ve a g a i n s t e l e c tro m a g n e ti c d i s tu rb a n c e s fro m o u ts i d e ; • h i g h d yn a m i c n g e • g o o d re p ro d u c i b i l i t y International Electrotechnical Commission >1 30 dB; I EC 621 53-4-7: 201 © I EC 201 – 39 – An n e x D ( i n fo rm a ti ve ) I n fl u e n ce of c o n ta ct re s i s ta n ce s C o n ta c t re s i s ta n ce s b e twe e n th e fe e d i n g ca b l e a n d th e e x te n s i o n tu b e o r th e s cre e n i n g c a s e i n th e te s t h e a d m a y i n fl u e n c e th e te s t re s u l t C o n ta c ts s h a l l b e p re p a re d ca re fu l l y wi th l o w re s i s ta n c e or wi th low i m pe d an ce C o n ta c ts sh al l be a ch i e ve d o ve r th e c o m p l e te ci rc u m fe re n c e o f th e s cre e n C ri ti c a l c o n ta c ts a re s h o wn i n F i g u re D Con n ector Tu be u n d er test G en erator Con tact R Recei ver S creen i n g case Con tact R Con tact Con n ecti n g cabl e Exten si on tu be R IEC F i g u re D – C o n ta ct re s i s ta n ce s o f t h e te s t s e t-u p T h e e q u i va l e n t ci rc u i t o f th e co m p l e te te s t s e t- u p i n cl u d i n g th e co n ta ct re s i s ta n c e s i s g i ve n i n F i g u re D T h e te s t s e t- u p s h a l l b e d e s i g n e d s u ch th a t co n ta ct re s i s ta n c e s o f th e e xte n s i o n tu b e a re i n s e ri e s wi th th e i n p u t i m p e d a n c e o f th e re c e i ve r a n d th e co n ta c t re s i s ta n ce o f th e s cre e n i n g c a s e i n c l u d i n g th e m a tc h i n g l o a d o f th e D U T i s i n s e ri e s wi th th e g e n e to r U meas R 50 R Ω exten si on tu be R 50 Ω R Z U ZT cabl e Z T DU T U R match IEC Ke y R , R an d R c o n t a c t re s i s ta n c e s d e p i c te d i n F i g u re D Z c h a c te ri s t i c i m p e d a n c e o f th e c o n n e c t i n g c a b l e ( s e e F i g u re B ) Z tra n s fe r i m p e d a n c e o f th e D U T câ b l e DU T F i g u re D – E q u i v a l e n t c i rcu i t o f th e te s t s e t-u p I n th i s c a s e , co n ta c t re s i s ta n c e s o f a fe w m g e n e to r o r th e re ce i ve r a re n e g l i g i b l e International Electrotechnical Commission Ω i n s e ri e s wi th th e Ω i n p u t re s i s ta n c e o f th e – 40 Th e te s t tra n s fe r s e t- u p i m pe d a n ce International Electrotechnical Commission sh ou l d i m pe d a n ce o f th e of D U T, be d esi g n ed th e D U T t h e y wi l l su ch If th a t co n ta c t i n fl u e n c e th e – co n ta ct IEC 621 53-4-7 : 20 re s i s ta n c e s re s i s t a n c e s a re re s u l t c o n s i d e b l y in a re n ot s e ri e s in © I EC s e ri e s wi t h th e 201 wi t h th e t r a n s fe r I EC 621 53-4-7: 201 © I EC 201 – 41 – B i b l i o g p h y Metallic communication cable test methods – Part 4-8: Electromagnetic compatibility (EMC) – Capacitive coupling admittance [1 ] I E C 621 53-4-8 , [2 ] I E C - - , Metallic communication cable test methods – Part 4-8: Electromagnetic compatibility (EMC) - Co u p lin g a tte n ua tio n o f s c re e n e d b a la n c e d c a b le s , tria xia l m e th o d [3 ] I E C 621 53-4-1 0, Metallic communication cable test methods – Part 4-1 0: S h ie lde d te s t m e th o d fo r m e a s urin g th e Scre e n in g Effe c tive n e s s of Feedtroughs and Electromagnetic Gaskets s cre e n in g [4 ] a tte n ua tio n I E C TR 62 53 -4-1 6, re p o rt on th e Metallic communication cable test methods – Part 4-1 6: re la tio n s h ip b e twe e n tra n s fe r im p e da n c e and s cre e n in g Te c h n ica l a tte n ua tio n ( u n d e r c o n s i d e ti o n ) [5 ] B R E I T E N B AC H O , H ÄH N E R T , fre q ue n cy n g e e xte n de d M U N D B , " Sc re e n in g a p p lica tio n of a s im p le of c a b le s m e a s urin g in m e th o d th e MHz to GHz ", Col l oq u i u m on s cre e n i n g e ffe cti ve - n e s s m e a s u re m e n ts , S a vo y P l a ce L o n d o n , M a y 9 , Re fe re n ce N o : 9 /4 [6 ] H ÄH N E R T , M U N D B , " Te s t cables " , [7 ] m e th o ds fo r s cre e n in g and b a la n c e of co m m un ica tio n th i n te rn a ti o n a l Z u ri c h E M C S ym p o s i u m , F e b ru a ry - 9 H AL M E L , KYT Ö N E N R , " Background b e h a vio urs and m e a s ure m e n ts and connectors " , of and introduction to EM screening (shielding) co a xia l and s ym m e trica l ca b le s , c a b le a s s e m b lie s C o l l o q u i u m o n s cre e n i n g e ffe cti ve n e s s m e a s u re m e n ts , S a vo y P l a c e L o n d o n , M a y 9 , R e fe re n c e N o : 9 /4 [8 ] H AL M E L , S Z E N T KU T I , m e a s ure m e n ts [9 ] KL E I N W., B, " Th e o f cylin drica l s cre e n s " D ie Th e o rie de s b a c kgro u n d fo r e le c tro m a gn e tic s cre e n in g " , T e c h R e p P T T ( 8 ) N r Ne b e n s p re ch e n s a uf L e itun ge n ", ( G e rm a n ) , S p ri n g e r Ve rl a g 5 [1 ] M U N D B , “ Measuring the EMC on RF- c o n n e c to rs a n d c o n n e ctin g h a rdwa re , tube test procedure ” , P ro ce e d i n g s o f th e rd I W C S /F o c u s 0 , P h i l a d e l p h i a , _ International Electrotechnical Commission Tu b e U SA in International Electrotechnical Commission International Electrotechnical Commission INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varembé PO Box 31 CH-1 21 Geneva 20 Switzerland Tel: + 41 22 91 02 1 Fax: + 41 22 91 03 00 info@iec.ch www.iec.ch International Electrotechnical Commission