BS 4319-1-1968 Methods of measurement of the electrical properties of electronic tubes and valves (excluding microwave devices) - Essential conditions for measuring equivalent inpu.pdf

1、BRITISH STANDARD BS4319-1: 1968 Methods of Measurement of the electrical properties of electronic tubes and valves (Excluding microwave devices) Part1: Essential conditions for measuring equivalent input and output admittances UDC 621.385:621.317.3BS4319-1:1968 This BritishStandard, having been appr

2、oved by the Telecommunication Industry Standards Committee and endorsed by the Chairman of theEngineering Divisional Council, was published undertheauthority of the GeneralCouncil on 30April1968 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference TLE/5 an

3、dTLE/5/2 Announcement in BSI News February1966 ISBN 0 580 00196 2 Co-operating organizations The Telecommunication Industry Standards Committee, under whose supervision this BritishStandard was prepared, consists of representatives from the following Government departments and scientific and industr

4、ial organizations: British Broadcasting Corporation British Electrical and Allied Manufacturers Association British Radio Equipment Manufacturers Association British Radio Valve Manufacturers Association* British Railways Board Cable and Wireless Ltd. Crown Agents for Oversea Governments and Adminis

5、trations Electrical Contractors Association (Incorporated) Electrical Research Association Electricity Council, the Central Electricity Generating Board and theAreaBoards in England and Wales Electronic Engineering Association* Electronic Valve and Semi-Conductor Manufacturers Association* Instituti

6、on of Electrical Engineers Institution of Electronic and Radio Engineers* Institution of Production Engineers Ministry of Defence Ministry of Defence, Army Department Ministry of Defence, Navy Department* Ministry of Labour (H.M. Factory Inspectorate) Ministry of Technology* Post Office* Radio and E

7、lectronic Component Manufacturers Federation Relay Services Association of Great Britain Science Research Council-Radio Research Station Telecommunication Engineering and Manufacturing Association The Government departments and scientific and industrial organizations marked with an asterisk in the a

8、bove list, together with the following, were directly represented on the committee entrusted with the preparation of this BritishStandard: Scientific Instrument Manufacturers Association of Great Britain UnitedKingdom Atomic Energy Authority Amendments issued since publication Amd. No. Date Comments

9、BS4319-1:1968 BSI 01-2000 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Definitions of admittances 1 3 Measuring conditions 1 4 Details of standard adaptor and shielding 2 Figure 1 Dimensions associated with the measurement ofinputandoutputadmittances 1BS4319-

10、1:1968 ii BSI 01-2000 Foreword This standard makes reference to the following BritishStandard: BS 448, Dimensions of electronic tubes and valves. This BritishStandard has been prepared under the authority of the Telecommunication Industry Standards Committee and is one of a series dealing with measu

11、rements of the electrical properties of electronic tubes and valves (excluding microwave devices) A related series dealing with microwave electronic tubes and valves is also in course of preparation. The technical content of this standard is identical with IEC Publication151-3, “Measurement of equiv

12、alent input and output admittances”. 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. Summ

13、ary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and 2, an inside back cover 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 fron

14、t cover.BS4319-1:1968 BSI 01-2000 1 1 Scope This Part of BS4319 outlines conditions to be followed when measuring input and output admittances of electronic tubes and valves (excluding microwave devices). It does not include measuring methods. These conditions include: 1) Definitions of the admittan

15、ces to be measured. 2) Measuring conditions. 3) Details of a standard adaptor and shielding. At present these apply to tubes and valves having the following bases: 2 Definitions of input and output admittance For the purposes of this BritishStandard, the input admittance (or the output admittance) i

16、s defined as the admittance measured between the points P andQ as described below: P is a point of contact on the pin connected to the input (or output) electrode. It is at a distance between2.5mm and3.5mm (0.0990.137in) from the base seat of the tube or valve (seeA in Figure 1). Q is a point on the

17、 reference plane (see4.1) directly beneath the pin on which P is located (seeFigure 1). 3 Measuring conditions 3.1 Maximum measuring voltage. The measuring voltage shall be such that, when applied to the measuring circuit, it shall not cause an alteration of more than1% in the cathode current of the

18、 tube or valve to be measured and shall not exceed100mV. 3.2 Electrode supply voltages. The operating conditions of the tube or valve shall be stated. 3.3 Measuring frequency. The measuring frequency shall be maintained within1% and shall be chosen from the following nominal values: 50MHz(Mc/s),100M

19、Hz(Mc/s),200MHz(Mc/s) If higher frequencies are required, it is recommended that the nominal values chosen be either500MHz(Mc/s) or1GHz(Gc/s). 3.4 Adaptors. The measurement shall be made with adaptors whose essential features are given in Clause4. These adaptors link the terminals of the tube or val

20、ve with the measuring terminals and with the various electrode supply voltages. Small button7-pin miniature base BS448-2.B7G a Small button noval9-pin base BS448-B9A a B8A/Rimlock base BS448-2.B8A a a BS448, “Dimensions of electronic tubes and valves”. Figure 1 Dimensions associated with the measure

21、ment of input and output admittancesBS4319-1:1968 2 BSI 01-2000 4 Details of standard adaptor and shielding 4.1 Reference plane. The reference plane of the adaptor is the surface of a metal plate mounted within the adaptor and perpendicular to the tube axis. It provides a conductive path between cir

22、cuit elements which connect the “other pins” to this reference plane. The reference plane shall be between7.2mm and7.8mm (0.2840.307in) from the tube or valve base seat (seeB in Figure 1). 4.2 By-pass impedance. No metallic contact may be made between the pins and the reference plane as the supply v

23、oltages to the tube or valve must be separated from the high-frequency measuring circuit. A radio-frequency by-pass shall be placed between each of the “other pins” and the reference plane to provide a high-frequency connection without metallic contact. NOTEThe impedance of this by-pass is called th

24、e “by-pass impedance”. The resistance and the reactive part of the by-pass impedance for the measuring frequency concerned shall be: R 0.3 X 1 NOTEThese values are limited in order to avoid feedback due to the external leads, especially the cathode lead. 4.3 Transfer-admittance of the adaptor. This

25、is the transfer-admittance of the four-pole between: 1) the measuring terminals available on the outside of the adaptor, and 2) the points P and Q mentioned in Clause2. The use of an adaptor inevitably results in an error due to its transfer-admittance which is usually inductive. In order to ensure

26、that the error is negligible, the inductance causing the transfer-admittance should be kept below1nH. 4.4 Shielding. The shield around the tube or valve influences the results of the measurements. Therefore the dimensions of such shields are standardized in accordance with the following table. The s

27、hielding around the space between the bottom of the tube or valve and the reference plane shall have the same internal diameter as the shielding around the tube or valve. Outline according to BS448-2 a Inner diameter of shield Height of shield Section B7G/2.1 all sizes Section B9A/2.1 sizes1,2 and3

28、Section B9A/2.1 size4 Section B8A/2.1 all sizes 3 / 4 + 1 / 64in (19.05+0.40mm) 7 / 8 + 1 / 64in (22.22+0.40mm) 7 / 8 + 1 / 64in (22.22+0.40mm) 22.5+0.5mm (0.886+0.019in) 2 1 / 4 1 / 64in (56.7657.1557.54mm) 2 1 / 4 1 / 64in (56.7657.1557.54mm) 3 1 / 64in (75.8176.2076.59mm) 78 0.5mm (3.0525.0713.09

29、0in) NOTEThe above-mentioned sections of BS448 give details of the following outlines: Section B7G/2.1, “Tube and valve outlines used with small button miniature7-pin base”. Section B9A/2.1, “Tube and valve outlines used with small button noval9-pin base”. Section B8A/2.1, “Tube and valve outline us

30、ed with B8A/Rimlock base”. a BS448, “Dimensions of electronic tubes and valves”, Part2, “Data sheets”.BS4319-1:1968 BSI 01-2000 BritishStandards The following are available on application: YEARBOOK Including subject index and numerical list of BritishStandards15s. SECTIONAL LISTS. Gratis Acoustics (

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