1、f RECOMMENDED PRACTICE FOR PREPARATION OF OUTLINE DRAWINGS OF ELECTRON TUBES AND BASES ELECTRONIC INDUSTRIES ASSOCIATION (Revision of RS-202) STANDARD RS-202-A Formulated by IEDEC Electron Tube Council EIA 202-A 64 = 3234b00 00b2922 4 . NOTICE These standards, adopted and issued by the Electronic In
2、dustries Association, were formulated by the Electron Tube Council of the Joint Electron Device Engineering Councils. EIA engineering standards are designed to serve the public interest through eliminating mis- understandings between manufacturers and purchasers, facilitating interchangeability and
3、improve- ment of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such standards shall not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to such
4、 standards. Recommended standards adopted by EIA are without any regard to whether or not their adop- tion may in any way involve patents on articles, materials, or processes. By such action, EIA dqes not assume any liability to any patent owner, nor does it assume any obligation whatever to parties
5、 adopting the recommended standards. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 11 West 42nd Street, New York 36, N. Y. 0 Electronic Industries Association 1964 All rights reserved . I Price $i .86 Printedin U.S.A. EIA 202-A 64 W 3234600 0062923 6 W RS-202-A Page 1 RECOMME
6、NDED PRACTICE FOR PREPARATION OF OUTLINE DRAWINGS OF ELECTRON TUBES AND BASES (From EIA Standard RS-202 and Standards Proposals 776 and 809 formulated under the cognizance of JEDEC Committee JT-8 on Mechanical Standardization) TABLE OF CONTENTS Page 1 . Purpose 2 2 . Definitions . 2 2.1 Tube Outline
7、 Definitions 2 2.2 Base Outline Definitions 3 3 . General Rules for Preparation of Outline Drawings . 3 4 . Tubeoutlines . 4 4.1 General Rules 4 4.2 Dimensions to be Shown on Tube Outline Drawings . 4 4.2.1 Receiving Tubes and Similar Types 4 4.2.2 Power and Transmitting Tubes and Similar Types 5 4.
8、2.3 Phototubes . 5 4.2.4 4.2.5 4.2.6 4.2.7 5 . Base Outlines Non-Conventional Power and Transmitting Tubes 5 Microwave Tubes (Magnetrons. Klystrons. Ignitrons. andPencilTubes) . 6 Cathode Ray Tubes. Glass Types (Camera. Picture. Oscillograph and Similar Type Tubes) 7 Cathode Ray Tubes. Metal Shell (
9、Oscillograph and PictureTubes) . 8 9 5.1 General Rules 9 5.2 Numbering of Base Pins 9 6 . Format of Drawings . 10 Appendix A Tabular Forms and Reference Letters for Dimensions on Tube. Base. and Gauge Outline Drawings 16 Appendix B Table of Decimal Places to Retain 18 . EIA 202-A bY W 3234600 00b292
10、4 8 = RS-202-A Page 2 1. PURPOSE 1.1 The purpose of this recommended practice is to supply the essential information required for the preparation of satisfactory tube and base outline drawings (hereinafter referred to as “outlines”) on electron tubes and related vacuum sealed devices for JEDEC appli
11、cation where standard outlines do not exist. (See EIA Standard RS-209-A.) In addition to meeting EIA registration, this informa- tion should also be of equal value to the ultimate user of the device. 1.2 From a mechanical standpoint, tube data may be considered complete for type registration when th
12、ey include an outline drawing giving the essential dimensions of the tube with the base (s) and electrode connections properly identified. Whenever a tube requires a base or envelope not already standardized or registered, the base and envelope information should be submitted with the tube outline.
13、(The tube manufacturer will not be required to furnish this information if the envelope is fabricated internally from composite segments of commercially available glass. The registration data of a tube so initially constructed shall mention this condition.) 1.3 Outlines may not be required for certa
14、in receiving and physically similar types comprising conventional envelope, base, and cap assemblies. Such tubes may be considered complete for registra- tion from a mechanical standpoint when the following physical specifications are in the form used on the JEDEC Electron Tube Data Sheets. a 1.3.1
15、Base and cap designations. 1.3.2 Envelope designation and diameter. 1.3.3 Overall length. 1.3.4 Seated height. 1.3.5 Pin, cap, and terminal connections. 1.3.6 JEDEC Basing or Terminal Diagram Number. 1.3.7 Specific shield connections not identified by 1.3.6. 1.3.8 Mounting position. a 2. DEFINITIONS
16、 The following definitions have been formulated to assist in the preparation of the outline drawings: 2.1 Tube Outline Definitions 2.1.1 Tube Outlines - A tube outline is a drawing of a tube which includes only the dimen- sional characteristics required for interchangeability. 2.1.2 Overall Length -
17、 is an overall clearance dimension of the tube including solder. (Flexi- ble leads shall not be included as a part of the overall length.) 2.1.3 Envelope Diameter - as referred to in tube outlines is the major or greater diameter of the envelope. Unless special requirements apply, the maximum envelo
18、pe diameter for glass envelopes shall be established as the maximum envelope ring-gauge diameter plus 1% of this value. (Maximum ring-gauge diameter includes out-of-round as well as maximum diameter.) 2.1.4 Base Diameter - refers to the major or greater diameter of the base. 2.1.5 Seated Height - re
19、fers to the distance from the bottom of base shell, wafer, button, etc., to top of any exposed tip, cap (with solder), or rigid terminal present, otherwise to top of envelope. Flexible leads shall not be included as a part of the seated height. 2.1.6 Dome Diameter - refers to the diameter of the par
20、allel-side portion of the envelope adjacent to its top or closed end such as that included in “ST” and some “T” type bulbs. 2.1.7 Base-Seat to Envelope-Top or Hold-Down Line - refer to the distance from the bottom of the base shell, wafer, button, etc., to the plane of a circle determined by a ring
21、gauge of specified diameter at right angles to the tube axis and generally concentric with it, 2.1.8 Basing Diagram (Terminal Diagram) - Basing diagrams are symbolic drawings show- ing the connections between the internal elements and the base contacts. 2.1.9 Tube Cap -A tube cap is a metal adjunct
22、which is essentially cylindrical and it is normally used for anode or grid connections on the tube envelope. The term “cap” does not apply to rigid leads which are used as anode or grid connectors, nor in cases where the electri- cal connections are made directly to a metal tube envelope. RS-202-A E
23、IA 202-A 64 = 3234600 0062925 T Page 3 2.2 Base Outline Definitions 2.2.1 Tube Base - A tube base is that part of an electron tube primarily used in making elec- trical connection or to support the connectors. 2.2.2 Contact Pins - The contact pins of the tube base are those portions of the base whic
24、h are ordinarily used for making electrical connections. 2.2.3 Base Outline - A base outline is a drawing of a base which includes the dimensional characteristics required for interchangeability of the tube of which it is a part. 2.2.4 Base Designation - The base designation shall be the JEDEC numbe
25、r and may include an identifying name when such has been standardized. Each base shall be identified on the individual tube outline by its base designation. 2.2.5 Locating Guide - A locating guide of a tube base is that portion of the base specifically designed to position the base in the socket. (I
26、llustrations of locating guides are: Bayonet pin, key or keyway, index guide, and similar devices.) 2.2.6 Datum Line - The datum line is a radial line used as a reference for numbering base contact pins. 2.2.7 Base Orientation Reference Mark- An orientation mark is (1) any bayonet pin, key or keyway
27、, or other index limiting the base-to-socket orientation to a single position, (2) any single base terminal readily distinguishable by eye as larger or smaller than the others, or (3) any distinctive boss, stippled pattern or color mark adjacent to a base terminal. 3. GENERAL RULES FOR PREPARATION O
28、F OUTLINE DRAWINGS 3.1 An outline drawing shall show all dimensions necessary to assure clearances and the mating with other auxiliary accessories. 3.1.1 Dimensional values shall not be shown directly on the outline drawing. They shall be shown in tabular form under the drawing through the use of re
29、ference letters on the outline. (For preferred tabular forms and references letters for dimensions on outlines see Appen- dix A.) 3.1.2 The tabular form should show dimensions in both inches and millimeters. A statement immediately above the tabular form shall indicate the original system of measure
30、ment. 3.1.3 The inter-conversion of inch and millimeter dimensions are based on 1 inch = 25.4 mm. It shall be the practice to use the option which provides for the use of the nearest rounded value within the tolerance zone. See Appendix B for number of decimal places to retain. 3.1.3.2 FOR UNTOLERAN
31、CED DIMENSIONS : 3.1.3.2.1 Inches to Millimeters The inch dimensions shall be convei3ed into millimeter values exactly. Then the following rule shall be applied : Established one decimal place less for conversion from inches to millimeters. 3.1.3.2.2 Millimeters to Inches The millimeter dimension sh
32、all be converted into inch values exactly. Then the following rule shall be applied : Establish one decimal place more for conversion from millimeters to inches. 3.1.3.1 FOR TOLERANCED DIMENSIONS : Example : 2.20 inches = 55.880 mm. rounded to 56.9. Example: 22.40 mm. = 0.8818897 inches rounded to 0
33、.882 inches. 3.2 Dimensions shall be as follows: 3.2.1 Where basic dimensions require tolerances to insure mechanical interchangeability, the dimension shall be shown as limits of size (maximum and/or minimum), except that the design center with plus and minus tolerances may be used if the tolerance
34、s are unequal or if the dimension is an angular one. NOTES : Tolerances used shall be normally greater than the actual manufacturing tolerances. 3.2.2 Basic dimensions without tolerances may be used where the dimension is for information only and does not affect mechanical interchangeability. These
35、dimensions shall not be used for inspection purposes. The limits shown shall be considered absolute values. EIA 202-A 64 m 3234600 0062926 L m RS-202-A Page 4 3.2.3 All linear dimensions and tolerances shall be expressed in inches and decimal parts, preferably to three places. The basic dimension an
36、d its tolerances shall show the same number of decimal places. NOTE : Decimal dimensions shall be established according to American Standard Rules for 3.2.4 All angular dimensions shall be expressed in degrees and decimal parts, preferably to one place. 3.3.1 At least one principal view. 3.3.2 Such
37、additional views and details as are required to show special configurations or appendages. Rounding Off Numerical Values (See ASA Standard 225.1). 3.3 The outline drawing shall include : 4.1 General Rules 4. TUBE OUTLINES 4.1.1 Where tube terminals, such as flexible leads, rigid leads, etc., are use
38、d for electrical connections in lieu of bases and caps, their essential dimensions and tolerances shall be shown on tube outline. Such flexible leads are not to be included in the overall length dimensions of the tube. 4.1.2 Reference letters shall be used in place of numerical dimensions on the out
39、line. The dimensional values of the reference letters shall be shown in tabular form under the drawings. (See Appendix A.) 4.1.3 On outlines showing tubes fitted with bases having four or fewer pins, the pin connec- tions may be indicated on the end view. A tabular form may also be used. 4.1.4 Indiv
40、idual tube outlines shall be supplemented by a basing diagram when the base with which it is fitted has more than 4 pins. Such basing diagrams shall replace the end view of terminal connections except where the end view is necessary to show the plane of electrodes or assist in labeling the connectio
41、ns. Basing diagrams shall be prepared in accordance with recognized conventions. 4.1.5 Base dimensions specified on base outline drawings should not be repeated on the tube outline using the base. 4.1.6 Where the base has a diameter greater than the envelope, both the envelope and base maximum diame
42、ters shall be specified. 9.P.7 When base connections are labeled, either the term “plate” or “anode” may be used. Pins which are not connected to any element shall be designated on the outline by “NC,” i.e., no connection. . 4.2 Dimensions to Be Shown on Tube Outline Drawings 4.2.1 Receiving Tubes a
43、nd Similar Types a Dome Base Semt Side cap Ttbbe Classijcathlz Length Helght (Largest) mluded) Line included) a Envelope Diam. to OveTa11 Seated Dam. (when Hold-down (when a. Glass and Metal - single ended Max. max. max. inax. - .- b. Metal - single ended (tubular en- max. max. max. max, - - c. Glas
44、s and Metal-single ended Max. max. max. max. - - d. Glass - double ended (excluding max. max. m?x. max. - - e. Glass and Metal-double ended max. m?x. max. max. I - f. Miniature and Subminiature sin- max. max. max. - max. - (tubular envelope) (excludingmin- min. iature and subminiature) velopes) (oth
45、er than tubular envelopes) min. miniature and subminiature) min. min. (other than tubular envelope) (ex- cluding miniature and subminia- ture) gle and double ended - for socket min. min. use. Subminiature single ended - with top tips for soldered-in use min. g. Non Conventional Tubes which do not fo
46、llow conventional designs or are of irregular configurations, should follow, as far as possible, the above general pat- tern with such other dimensions and tolerances as will establish space and fit limitations. (Also see 4.2.4.) a EIA 202-A 64 m 3234600 0062927 3 m RS-202-A Page 5 4.2.2 Power and T
47、rammittirtg Tubes and Similar Types See Section 4.2.4 for irregular types. Dome Base Seat Envelope Dhm. to Side cap Tube Classification Length Heght (Largest) included) fine incbded) Overall Seated Diarn. (when Hold-down (when a. Glass and Metal-single ended max. max.9 max. none - max. no contact sh
48、ould be made to surfaces controlled only by maximum dimensions.) 4.2.41.3 Dimensions which control only the size of interior volumes available to the user should be shown only as minimums. (The outline drawing, rather than the device itself, must be used to determine the maximum size of internal con
49、tact devices or appur- tenances introduced into the basic total volume. Contact must be made only to the controlled surface of these interior volumes.) 4.2.4.4 Contact surface length should be shown only as minimums, especially where edges of these surfaces terminate in undefinable lines such as tangents to radii. (The outline drawing, rather than the device itself, must be used to determine the surface area available for contact ; clearance for possible extensions of these contact areas must be provided, where permissible, within the defined outline dimensions of the device.) 4.2.41
