1、STD.BSI BS EN bL580-8-ENGL 1977 Lb2qbbS 0577b05 752 BRITISH STANDARD Methods of measurement for waveguides Part 8. Waveguide power holding capability * * v, The European Stanad EN 61580-8 : 1996 has the status of a British Standard ICs 33.120.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED
2、BY COPYRIGHT LAW BS EN 61580-8 : 1997 1996 IEC 1580-8 STD-BSI BS EN bL580-8-ENGL 1777 Lb24bb7 I1577bOb 877 AmdNo. BS EN 61580-8 : 1997 Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPIJ46, Cables, wir
3、es and waveguides, RF connectors and accessories for communication and signalling, to Subcommittee EPU46E, U? connectors and waveguides, upon which the following bodies were represented: AEA Technology BFXMA Electncal Cable and Conductor Accessory Manufacturers British Non-Ferrous Metais Federation
4、British Telecommunications plc Federation of the Electronics Industry Ministry of Defence National Supervisory Inspectorate Sociem of Cable Television Engineers This British Standard, having been prepared under the ciireciion of the Eiectrotechnicai Sector Board, was published under the authority of
5、 the Standards Board and comes into effect on 15 March 1997 O BSI 1997 Amendments issued since publication The following ES1 references relate to the work on this standard Committee reference EWW2 Draft for comment 96/203428 DC I l ISBN O 680 26940 X I STD-BSI BS EN bL580-8-ENGL 1777 Lb24bb7 0577b07
6、 725 BS EN 61680-8 : 1997 - Contents Committees responsible National foreword page Inside front cover ii Foreword Text of EN 61580-8 2 3 O BSI 1997 i STD-BSI BS EN bL580-8-ENGL 1777 M LbZLibb7 0577b08 bbL M BS EN 61580-8 : 1997 National foreword This British Standard has been prepared by Subcommitte
7、e EPIJ462 and is the English language version of EN 61580-8 : 1996 MeUz0d.s of measurement for waveguides Part 8: Waveguide power holing capability published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 1580-8 : 1996 .published by the Internation
8、al Electrotechnid Commission (IEC). Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, inside front cover, pages i to ii, the EN title page, pages 2 to 6, an inside back cover and back cover. ii O BSI
9、1997 EUROPEAN STANDARD NORME EUR0PEE”E EUROP- NORM EN 6158M August 1996 ICs 33.120.10 Descriptors: Waveguides, power holding capability English version Methods of measurement for waveguides Part 8: Waveguide power holding capability (IEC 1580-8 : 1996) Mthodes de mesure appliques aux guides dondes P
10、artie 8: Aptitude dun guide dondes la tenue en puissance (CE1 1580-8 : 1996) Mefiverfahen fur Hohlleiter Teil 8 bertragbare Leistung eines Hohiieiters (IEC 1580-8 : 1996) This European Standard was approved by CENELEC on 199607-02. CENELEC members are bound to comply with the CENKENELEC Internal Reg
11、ulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Upto-date lists and bibliographical references concerning such national standards may be obtwied on application to the Central Secretariat or to any CENELEC member. Thi
12、s European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Centsal Secretariat has the same stab as the official versions. CENELEC members
13、are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. -CENELEC European Committee for Electrotechnical Standardization Comit Europ
14、en de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1996 Copyright reserved to CENELEC members Ref. No. EN 61580-8 : 1996 E STD*BSI BS EN blI580-8-ENGL 1777 Lb24bb7 0577bLO ZIT W Page 2 EN 61580-8 : 1996 For
15、eword Contents The text of document 46B/209/FDIS, future edition 1 of IEC 15808, prepared by SC 46B, Waveguides and their accessories, of IEC TC 46, Cables, wires, waveguides, 1 Scope R.F! connectors, and accessories for communication and signalluig, was submitted to the IEGCENELEC parallel vote and
16、 was approved by CENELEC as EN 61580-8 on 19960742. 4 Procedure The following dates were fixed 2 Testequipment 3 principle of operation 6 Reference document - latest date by which the Figures EN has to be implemented at national level by publication of an identical national standard or by endorsemen
17、t (dop) 1997-04-01 latest date by which the national standasds conflicting with the EN have to be withdrawn - (dow) 1997-04-01 Page 3 3 3 4 4 5 O BSI 1997 STD.BS1 BS EN bL580-8-ENGL 1997 LbZLibbS 0599bLL 15b Page 3 EN 61580-8 : 1996 METHODS OF MEASUREMENT FOR WAVEGUIDES - Part 8: Waveguide power hol
18、ding capability 1 Scope This part of IEC 1580 describes the measurement of the power holding of a waveguide by the use of a multiplying loop. In this case, the input power required is much less (-10 dB to -12 dB) than when the WUT is directly connected to a high power source. 2 lest equipment The te
19、st Set-up shown in figure 1 includes: a) water load; b) variable coupler; c) monitoring couplers (PE, PS, PR); d) phase shifter; e) attenuators; f) slide screw tuner. 3 Principle of operation * * VI A portion of the input power (Po) from the source is coupled into the loop via the variable coupler.
20、By adjusting the phase shifter to give a resonance length of loop, the power circulating in the loop (P) can be maximized. At resonance, depending upon loop attenuation, P can be much greater than Po. The gain in the loop is given by: Gai“ p)= C where A is the attenuation in the loop, in dB; C is th
21、e input coupling factor. The curves of figure 2 give loop gain variation as a function of loop attenuation and coupling factor. STD-BSI BS EN bL580-8-ENGL 1777 m 1b29bb7 0577bL2 O72 m Page 4 EN 61580-8 : 1996 Loop power is measured via coupler PS, and reverse power via PR. A slide screw tuner may be
22、 included in the loop to minimise the reflected wave. It is important to minimize loop loss in order to maximize loop power. 4 Procedure By adjusting the phase length in the loop, circulating energy combines in phase with coupled energy from the source to give a cumulative effect. Power builds up in
23、 the loop until limited by the factors discussed in clause 3. Power in the WUT is then measured via coupler PS. If required the temperature attained by the WUT can be measured. NOTE - The water toad should be capable of handling :he full input power Po .when :he loop is off resonance, or when power
24、breakdown occurs In the loop. 5 Reference document l K. Tomiyasu: Attenuation in resonant ring circuit, IRE Trans MTT8, pp 253-254. Page 5 EN 61580-8 1996 Coupleur Coupler Q charge Gnrateur RF Load RF generator -El DbDhaseur Frquencemtre Frequency meter o PhaSe shier Puissance rflchie Reflected powe
25、r Figure i - Boucle rsonante Multiplying loop Page 6 EN 61580-8 : 1996 10 1 2 1 S 8 IO 12 14 1s 10 P Figure 2 STD.BS1 BS EN bL580-8-ENGL 1997 m LbZVbbS 0599bL5 BTL m BS EN 61580-8 : 1997 IEC 1580-8 1996 BSI 389 Chiswick High Road London w4 4AL . . . . _ . . . . BSI - British Standards Institution 3S
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