1、BRITISH STANDARD BS EN 61580-8:1997 IEC1580-8: 1996 Methods of measurement for waveguides Part8: Waveguide power holding capability The European Standard EN61580-8:1996 has the status of a British Standard ICS33.120.10BSEN 61580-8:1997 This British Standard, having been prepared under the directiono
2、f the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes into effect on 15 March1997 BSI12-1998 The following BSI references relate to the work on this standard: Committee reference EPL/46/2 Draft for comment96/203428 DC ISBN058026940 X Committees respon
3、sible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPL/46, Cables, wires and waveguides, RF connectors and accessories for communication and signalling, to Subcommittee EPL/46/2, RF connectors and waveguides, upon which the following bodies
4、were represented: AEA Technology BEAMA Electrical Cable and Conductor Accessory Manufacturers British Non-Ferrous Metals Federation British Telecommunications plc Federation of the Electronics Industry Ministry of Defence National Supervisory Inspectorate Society of Cable Television Engineers Amendm
5、ents issued since publication Amd. No. Date CommentsBSEN 61580-8:1997 BSI 12-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN61580-8 3BSEN 61580-8:1997 ii BSI 12-1998 National foreword This British Standard has been prepared by Subcommittee EP
6、L/46/2 and is the English language version of EN61580-8:1996 Methods of measurement for waveguides Part8: Waveguide power holding capability published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC1580-8:1996 published by the International Electrot
7、echnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pag
8、es This document comprises a front cover, an inside front cover, pages i and ii, theENtitle page, pages2 to6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN
9、 STANDARD NORME EUROPENNE EUROPISCHE NORM EN61580-8 August1996 ICS33.120.10 Descriptors: Waveguides, power holding capability English version Methods of measurement for waveguides Part8: Waveguide power holding capability (IEC1580-8:1996) Mthodes de mesure appliques aux guides dondes Partie8: Aptitu
10、de dun guide dondes la tenue en puissance (CEI1580-8:1996) Meverfahren fr Hohlleiter Teil8: bertragbare Leistung eines Hohlleiters (IEC1580-8:1996) This European Standard was approved by CENELEC on1996-07-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipula
11、te the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard
12、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 Central Secretariat has the same status as the official versions. CENELEC members are the national e
13、lectrotechnical 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 Europen de Normalisation
14、 Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1996 Copyright reserved to CENELEC members Ref. No. EN61580-8:1996 EEN61580-8:1996 2 BSI 12-1998 Foreword The text of document46B/209/FDIS, future edition1 of IEC1580-8, prepar
15、ed by SC46B, Waveguides and their accessories, of IECTC46, Cables, wires, waveguides, R.F. connectors, and accessories for communication and signalling, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61580-8 on1996-07-02. The following dates were fixed: Contents Page
16、 1 Scope 3 2 Test equipment 3 3 Principle of operation 3 4 Procedure 3 5 Reference document 3 Figure1 Multiplying loop 4 Figure2 5 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1997-04-01 latest date by whi
17、ch the national standards conflicting with the EN have to be withdrawn (dow)1997-04-01EN61580-8:1996 BSI 12-1998 3 1 Scope This part of IEC1580 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 t
18、o 12 dB) than when the WUT is directly connected to a high power source. 2 Test equipment The test set-up shown inFigure 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 A portion of
19、the input power (P 0 ) from the source is coupled into the loop via the variable coupler. 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 P 0 . The gai
20、n in the loop is given by: The curves ofFigure 2 give loop gain variation as a function of loop attenuation and coupling factor. Loop power is measured via coupler PS, and reverse power via PR. A slide screw tuner may be included in the loop to minimise the reflected wave. It is important to minimiz
21、e 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 the loop until limited by the factors discussed in clause3. Power in the WUT is
22、 then measured via coupler PS. If required the temperature attained by the WUT can be measured. NOTEThe water load should be capable of handling the full input power P 0when the loop is off resonance, or when power breakdown occurs in the loop. 5 Reference document 1 K. Tomiyasu: Attenuation in reso
23、nant ring circuit, IRE Trans MTT8, pp253-254. where A is the attenuation in the loop, in dB; C is the input coupling factor. Gain P P 0 - C 110 A 20 - 1 C 2 - 2 =EN61580-8:1996 4 BSI 12-1998 Figure 1 Multiplying loopEN61580-8:1996 BSI 12-1998 5 Figure 2BSI 389 Chiswick High Road London W4 4AL | | |
24、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the indepen
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