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1、BRITISH STANDARD BS 9040:1978 Specification for Gas-filled microwave switching tubes of assessed quality: Generic data and methods of test UDC 621.372.837.2:621.387.362 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (
2、c) BSI BS 9040:1978 This British Standard, having been prepared under the direction of the Electronic Components Standards Committee, was published under the authority of the Executive Board on 31 May 1978 BSI 05-2000 First published December 1970 First revision May 1978 The following BSI references
3、 relate to the work on this standard: Committee reference ECL/5 Draft for comment 72/29217/DC ISBN 0 580 10248 3 Cooperating organizations The Electronic Components Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Governmen
4、t department and scientific and industrial organizations: British Electrical and Allied Manufacturers Association (BEAMA) Electricity Supply Industry in England and Wales Electronic Components Industry Federation* Electronic Engineering Association Institution of Electronic and Radio Engineers* Mini
5、stry of Defence* National Supervising Inspectorate* Post Office Society of British Aerospace Companies Limited* Telecommunication Engineering and Manufacturing Association (TEMA) Trades Union Congress The organizations marked with an asterisk in the above list, together with the following, were dire
6、ctly represented on the committee entrusted with the preparation of this British Standard: Scientific Instrument Manufacturers Association United Kingdom Atomic Energy Authority Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London Sout
7、h Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 BSI 05-2000i Contents Page Cooperating organizationsInside front cover Forewordii Section 1. General matters 1.1Scope1 1.2Related documents1 1.3Terminology1 1.4Letter symbols, signs and abbreviations3 1.5G
8、raphical symbols4 1.6Marking of the tube and packing4 1.7Eligibility for qualification approval4 1.8Structurally similar tubes4 1.9Delayed delivery5 1.10Supplementary procedure for qualification approval5 1.11Certified test records5 1.12Standard ratings and characteristics5 1.13Unchecked parameters6
9、 1.14Procedure to be followed in the event of failures at group C or D inspection6 1.15Ordering information6 1.16Release prior to completion of group B tests6 1.17Inspection procedures for low rates of production6 1.18Continuous production6 Section 2. Test procedures 2.1Test and measurement conditio
10、ns6 2.2Visual inspection6 2.3Dimensioning and gauging procedures7 2.4Electrical test procedures7 2.5Mechanical test procedures9 2.6Environmental test procedures10 2.7Endurance test procedures11 Figure 1012/135 Figure 1012/235 Figure 1015/141 Figure 1015/2 Oscilloscope display41 Figure 1019/145 Figur
11、e 1019/245 Figure 1021/149 Figure 1021/249 Figure 1024/153 Figure 1024/254 Figure 1025/155 Figure 1025/256 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 ii BSI 05-2000 Foreword This British Stand
12、ard, which supersedes BS 9040:1970, has been prepared under the direction of the Electronic Components Standards Committee and is the generic specification for gas-filled microwave switching tubes in the system of standards for electronic parts of assessed quality. A British Standard does not purpor
13、t 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 pages This document comprises a front cover, an inside front cov
14、er, pages i and ii, pages 1 to 67 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 the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri De
15、c 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 BSI 05-20001 Section 1. General matters 1.1 Scope This British Standard forms part of the system of common standard specifications for electronic parts of assessed quality and should be read in conjunction with the standards in th
16、e series BS 9000 to BS 9009 inclusive. It applies to t.r. tubes, t.r. limiters, a.t.r. tubes, pre-t.r. tubes, and passive protection tubes as defined in 1.3 and gives the terms, definitions, symbols, test methods and other material necessary to implement fully the detail specifications for these tub
17、es. The material herein shall be applicable only when called up by the detail specification, except for 1.6 to 1.18 inclusive which are mandatory requirements. 1.2 Related documents BS 448, Dimensions of electronic tubes and valves. BS 1991, Letter symbols, signs and abbreviations. BS 2011, Basic en
18、vironmental testing procedures. BS 3939, Graphical symbols for electrical power, telecommunications and electronics diagrams. BS 3966, Microwave measuring instruments. BS 4727, Glossary of electrotechnical, power, telecommunications, electronics, lighting and colour terms Part 1: Terms common to pow
19、er, telecommunications and electronics. BS 6001, Sampling procedures and tables for inspection by attributes. BS 9000, General requirements for electronic components of assessed quality Part 1: General description and basic rules. BS 9240, Flanges, fastenings and accessories of assessed quality for
20、waveguide tubing and components: generic data and methods of test. PD 9002, BS 9000 Component selection guide Part 1: Qualified products list Part 2: Miscellaneous. IEC 134, Rating systems for electronic tubes and valves and analogous semiconductor devices. 1.3 Terminology For the purposes of this B
21、ritish Standard the following terms and definitions, in addition to those from BS 4727, apply. 1.3.1 t.r. tube a gas-filled transmission line cavity which acts as a short-circuit when ionized but transmits low power signals from the aerial to the receiver when not ionized 1.3.2 t.r. limiter a device
22、 incorporating a t.r. tube and a semiconductor limiting diode the purpose of which is to reduce the amplitude of the leakage which would have passed through the t.r. tube if used alone 1.3.3 a.t.r. tube a gas-filled transmission line cavity which acts as a short-circuit when ionized but is an open-c
23、ircuit when un-ionized. It is used in a t.r. switch for directing the energy received from the aerial to the receiver to an extent independent of the transmitter impedance 1.3.4 pre-t.r. tube a gas-filled microwave switch tube used in duplexing systems to reduce the incident power on a t.r. tube 1.3
24、.5 passive protection tube a gas-filled microwave switch tube used in front of a mixer or detector diode to prevent r.f. electrical overload Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 2 BSI 05
25、-2000 1.3.6 primer ignition the process of creating local ionization by means of an applied d.c. or pulsed voltage for the purpose of increasing the electron density in the breakdown gap of the tube in order to facilitate the ionization of the tube on the application of high r.f. power 1.3.7 primer
26、ignition period the period of time taken for the completion of primer ignition after the application of primer voltage 1.3.8 primer current the current which flows when a voltage is applied to the primer terminal 1.3.9 primer interaction the change in insertion loss resulting from energizing the pri
27、mer 1.3.10 primer voltage drop the voltage drop between the body of the tube and the primer terminal when primer current flows 1.3.11 primer noise temperature increase in noise temperature at the output terminal due to an energized primer 1.3.12 firing the ionization of the gas within the tube which
28、 occurs due to r.f. energy 1.3.13 firing period the period of time taken for the tube to fire after the application of the r.f. energy 1.3.14 firing power the minimum incident r.f. power that causes the tube to fire 1.3.15 cold or unprimed insertion loss the loss of power at low level, due to the in
29、sertion of the tube in a transmission line, with the primer unenergized 1.3.16 primed or total insertion loss the loss of power at low level, due to the insertion of the tube in a transmission with the primer energized 1.3.17 arc loss the loss of transmitted high power after the reference short circ
30、uit has been replaced by the tube 1.3.18 low-power leakage the maximum power leakage, through the tube, which occurs when the incident power on the tube is gradually increased from a level below to a level above the firing power 1.3.19 total leakage power the power transmitted through the tube avera
31、ged over the period of the incident r.f. pulse Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 BSI 05-20003 1.3.20 spike leakage energy the initial transient pulse of energy which is transmitted th
32、rough the tube prior to its firing 1.3.21 flat leakage power the leakage power through the tube during the period when the tube is fully fired 1.3.22 amplitude recovery period that period of time between the instant at which the r.f. ionizing pulse ceases and that instant at which the low-power atte
33、nuation caused by the tube is 3 dB below fully recovered value 1.3.23 phase recovery period the period of time between the instant at which the r.f. ionizing pulse ceases and that instant at which the phase shift of the low power signal reduces to a specified value 1.3.24 electrical length the equiv
34、alent length of a specified transmission line that produces the same phase shift as the tube 1.3.25 short-circuit position the position, relative to a specified reference plane on the tube, at which an effective short-circuit occurs when the tube is fired 1.3.26 reference frequency the r.f. frequenc
35、y at which measurements are made 1.4 Letter symbols, signs and abbreviations For the purposes of this British Standard, the following letter symbols apply. bnormalized susceptance Dduty factor dscshort circuit position fofrequency of resonance frreference frequency gnormalized conductance Iprprimer
36、current Linsertion loss cold Lprinsertion loss primed Laarc loss Llattenuation Lrrejection loss L%famplitude tracking L%Tamplitude tracking with temperature Nnoise Pambient pressure Pavmean power Pffiring power Pflflat leakage power Plplow power leakage Pppulse power Licensed Copy: London South Bank
37、 University, London South Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 4 BSI 05-2000 1.5 Graphical symbols For the purposes of this British Standard graphical symbols shall be in accordance with BS 3939 (IEC 117). 1.6 Marking of the tube and packing Th
38、e following symbols or codes shall be clearly and durably marked on the tube in the following order of preference as space permits. All symbols and codes except terminal marking and operating conditions shall also appear on the primary pack, e.g. carton, box, plastics envelope etc., used as initial
39、protection or wrapping for delivery. a) Manufacturers part designation number and special marking relating to hazard and special operating conditions. b) Manufacturers factory identification code. c) Date code. d) BS number of the detail specification. 1.7 Eligibility for qualification approval The
40、first stage of processing in accordance with 2.3.2 3) of BS 9000-1 is a) construction of the frequency determining elements and the joining together of all piece parts; b) the use of the procedure specified in 2.3.2 3) ii) of BS 9000-1 is excluded. 1.8 Structurally similar tubes When simultaneous or
41、 successive production is proceeding on several types of tube having common features, those common features may be sampled from the complete range of types instead of from each lot of each type. Some examples of admissible common features and associated tests are: Ptottotal leakage power QLloaded Q
42、Rprprimer resistor rvoltage standing wave ratio rovoltage standing wave ratio at fo tffiring period tiprimer ignition period tptf pulse duration tplduration of leakage pulse tramplitude recovery period trphase recovery period Topoperating temperature range Tptprimer noise temperature Tstgstorage tem
43、perature range Wsspike leakage energy Wspspike leakage amplitude Vprprimer voltage phase %fphase tracking %Tphase tracking with temperature electrical length Common method of mounting Visual inspection Terminal inspection Dimensions Temperature cycling and moisture resistance and/or fixed lug torque
44、 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 9040:1978 BSI 05-20005 Claims for structural similarity shall be made in accordance with the requirements of 2.4.6 of BS 9000-1. 1.9 Delayed delivery Tubes he
45、ld by the manufacturer for a period exceeding one year following acceptance inspection shall be re-inspected before release for all subgroup A2 requirements. 1.10 Supplementary procedure for qualification approval The above table supersedes the sample size requirements of 2.3.1 of BS 9000-1, for pro
46、duction lot sizes below 280 specimens. The samples may be drawn from one production lot. When using the table a second sample, as shown, shall be taken when the quantity of defectives exceeds the acceptance quantity but is less than the reject quantity. Where production rates are 12 tubes per month
47、or less, permission to release prior to approval may be granted on successful completion of the specified tests on two specimens for groups A and B and one specimen for groups C and D. On receipt of such permission the manufacturer may commence to release components meeting the specification. Qualif
48、ication approval will be granted when the number of specimens quoted in the above table have satisfied the specified requirements, provided that during this period no inspection lots have been rejected. Permission to release tubes will be withdrawn a) in the event of the rejection of an inspection l
49、ot prior to the granting of qualification approval; b) in the event of qualification approval not being granted within 18 months of the date of permission to release. When permission to release is granted, the specification number will be shown in Part 4 of PD 9002 but there will be no entry in Part 1 of PD 9002 until qualification approval is granted. All release documentation including the certificate of conformity shall be prominently marked “This tube is released in advance of qualification approval” and the reference of the document grantin
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