1、EIA STANDARD RECOMMENDED PRACTICE FOR PREPARATION OF BASING OR TERMINAL DIAGRAMS RSw206.C (Revision of RS-206-B) JUNE 1980 Engineerng Department ELECTRONIC INDUSTRIES ASSOCIATION NOTICE EIA Engineering Standards are designed to serve the public interest through eliminating misunderstandings between
2、manufacturers and purchasers, f aci- litating interchangeability and improvement 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 o
3、f EIA from manufacturing or selling products not conforming to such standards, nor shall the existence of such standards preclude their voluntary use by those other than EIA members, whether the standard is to be used either domestically or internationally. Recommended standards are adopted by IA ,w
4、ithout regard to whether or not their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the recommended standards. This EIA Recommended Standard is c
5、onsidered to have international stan- dardization implications, but the IEC (or ISO) activity has not progressed to the point where a valid comparison between the EIA Recommended Standard and the IEC (or ISO) Recommendation can be made. . ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001
6、 Eye Street, N.W., Washington, D.C. 20006 PRICE: $4.00 . . *. RECOMMENDED PRACTICE FOR PREPARATION OF BASING OR TERMINAL DIAGRAMS TABLE OF CONTENTS Paragraph 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13 Purpose General Graphic and Scope Symbols Terminal or Base-Pin Symbols Base-Pin Numbering Diagram De
7、signation Rules for Preparation of Diagrams-General Rules Applying to Multielectrode Types Rules Applying to Subminiature Types Rules Applying to Phototubes and Camera Tubes Rules Applying to Gas-Filled Tubes Rules Applying to Electrical Components Illustration of Application of Rules Page 1 1 1 2 2
8、 3 3 4 5 5 5 5 5 o EIA 206-C 80 3234600 0062944 3 RS-206-C Page 1 RECOMMENDED PRACTICE FOR PREPARATION OF BASING OR TERMINAL DIAGRAMS (From EIA Standards Proposal No. 1278, formulated under the cognizance of TEPAC Committee JT-6 on TV Picture Tubes.) 1. PURPOSE AND SCOPE It is the purpose of this St
9、andard to establish the basic rules, which shall be used as a guide in the preparation of basing and terminal diagrams for electron tubes and associated sealed devices. It is not intended to be applied to schematic or wiring diagrams although the depiction of the internal connections of the devices
10、may be applicable to such usage if desired. The rules herein promulgated have been specifically planned to cover low-power high- vacuum, gas and cathode ray tubes, klystrons, and photo-tubes. These rules do not cover other microwave, high-power vacuum, gas, storage, or x-ray tubes, as terminal infor
11、mation for those devices ordinarily is contained in the outline drawing. 2. GENERAL Basing or terminal diagrams shall indicate the essential electrical connections for electron tubes and associated sealed devices. The basing or terminal diagram shall consist of a tube graphic symbol, terminal or bas
12、e-pin symbols and base-pin numbers, and a diagram designation. These symbols shall be used to indicate the functional structure of a tube rather than its physical structure. No lettering shall be a portion of the diagram other than the diagram designation, the terminal or base-pin symbols, and requi
13、site notes as herein defined. 3. GRAPHIC SYMBOLS Graphic symbols as standardized by the American National Standards Institute (ANSI) in the latest issue of their standard ANSI/IEEE Std. 315-1975 (Y32.2) “Graphic Symbols for Electrical arid Eletronic Diagrams,“ shall be used in the preparation of TEP
14、AC (formerly JEDEC) basing and terminal diagrams. In the absence of suitable symbols as standardized by ANSI, symbols standardized by the Institute of Electrical and Electronic Engineers (IEEE), or symbols established by TEPAC (formerly JEDEC) may be used. . - EIA 20b-C 80 3234600 0062945 5 H RS-206
15、-C Page 2 4. TERMINAL OR BASE-PIN SYMBOLS 4.1 The following symbols shall be used with the, indicated significance on basing or terminal diagrams: A11 base pins present shall be labeled: IC- No external connection shall be made to any base pin marked fflCft. NOTE: Such a pin may have an internal con
16、nection to a tube element, or may be reserved for such connection as an option of the tube manufacturer, or, for other reasons, may cause trouble if .connected to any portion af an external circuit, IS- Any internal shield or other .element if not graphicaIy depicted which may require the establishm
17、ent of a definite potential to secure satisfactory operation. If internal shiefdng is graphieally depicted the designation “ICf1 shall not be used. An external connection may be made to any terminal designated lfLCtl only under the li ted conditions appearing on the data sheet. LC- NC- NOTE: Omitted
18、 base pins and pins marked “NCf are considered equivalent in the assignment of basing designationc- Pin present, but not internally connected. S- Any connection of an external shield integral with a tube. “External Shields“ are here considered to include the shell of a metal sleeve of a GT-tube base
19、, a lock-in base shell and an external conductive coating or casing. NOTE: The letter symbol iiS1i identifies. an external electronic shield connected to a. distinctive terminal which may or may nat require grounding according to circuit requirements. Where an external con- ductive coating serves as
20、 one side of a capacitor (as in cathode ray tubes) and is not designed to function as an electrostatic shield, the letter IrSt should not appear. S/NC-Metal envelope shell or no internal connection (not recommended for new types), NOTE: This letter combination, has been used on terminal dlagFarns wh
21、ich cover the case where a single diagram is used to give terminal connection information for similar glass and metal tubes. 5, BASE-PIN NUMBERING Base pins on basing or terminal diagrams shall be numbered in accordance with the latest issue of EL4 RS-202, shall be the highest pin number present in
22、the hase. The basing designation number EIA 20b-C 80 3234600 00b294b 7 a RS-206-C Page 3 6. DIAGRAM DESIGNATION A diagram designation may be assigned by the EIA Engineering Department when a type designation is assigned to the device. Previsouly assigned EIA basing designations not in conflict with
23、this system shall be retained as TEPAC designation numbers. Any obsolete or voided previously assigned EIA basing designation shall not be reassigned for TEPAC. Diagrams that differ only in supplemental internal connections (for example, internal shields) to pins already used shall be assigned the s
24、ame basing diagram number. 7. RULES FOR PREPARATION OF DIAGRAMS-GENERAL 7.1 In line with standard drafting practice, straight-line crossover shall If conditions demand them, loop crossovers may be normally be used. used. 7.2 The basing diagram shall show only those pins present in the base; space sh
25、all be allowed for missing pins on the diagram. Pins that have been clipped off at the base and are inaccessible shall be treated as missing. 7.3 The diagram shall show that reference characteristic used to establish the datum line for pin numbering. shall intersect the 6 oclock position of the diag
26、ram except for subminiature type with an “in-line“ lead arrangement. On the diagram for subminiature types with “in-line“ lead arrangement, the base reference characteristic shall be at the 3 oclock position. The datum line 7.4 An appropriate note shall be used on diagrams when required to identify
27、unequivocally the location of a terminal. 7.5 When it, is impractical to show all external-connection symbols on the circle representing the tube envelope, the remaining symbols may be shown on an additional broken-line circle or circles drawn externally concentric with the first circle. Symbols ass
28、ociated with a concentric- pin circle, a second base or other electrical connections to the tube may also be shown on a broken-line circle. When determining which external connection symbols shall be shown on the circles, consideration should be given to Rule 7.4. 7.6 Shielding, internal or external
29、, with connection to a separate terminal, shall be graphically depicted. Shielding or other metal parts electrically connected to other elements may be depicted graphically if necessary to adequately describe the tube. - EIA 20b-C 0 m 323qbOO 00629L17 9 m RS-206-C Page 4 7.7 A connection to the anod
30、e, collector, dynode, photocathode, deflecting electrode, composite anode-photo-cathode, and composite anode-cold cathode shall be at the center of that symbol. Connection to any other electrode may be shown at either end or both ends of the electrode symbol, 7.8 A type having a grid adjacent to a p
31、late, but internally connected to the plate to form a portion of it shall be shown as having a plate only. A type having a grid adjacent to the cathode, but internally connected to the cathode to form a portion of it, such as in indicator tubes, shall be shown as having a cathode only. 7.9 0. RULES
32、APPLYING TO MULTIELECTRODE TYPES 8.1 A type having two or more electrodes tied internally shall be shown with symools for each electrode, except when the electrodes are adjacent in the tube structure and perform the same function. Thus the diagram for a twin pentode having a common screen grid and c
33、onnection for each section, and for a converter tube having the Na 3 and No. 5 grids connected internally, shall show separate symbols for each grid. However, a triode where the control grid is physically in the form of two grid windings shall show only.one grid. Also for cathode ray tubes, limiting
34、 apertures shall not be separately depicted, 8.2 The diagram for a tube having more than one heater, shall show only one heater (inverted V) unless the heaters have separate connections. If a tap is made, one heater symbol shall still be shown and the tap shall be shown at the vertex of the heater s
35、ymbol regardless of the actual division of voltage across the heater. 8.3 Paragraph 8.2 shall apply also to filaments. In case of a tap, either brought out to a pin connection or internally connected as to a suppressor grid, the tap shall be shown at the vertex of the filament A type having more tha
36、n one cathode shall be shown as having a single cathode unless separate cathode connections are made, In multi-section. types having filamentary cathodes, the relative position of the sections along the filament shall be shown (disregarding voltage division between the sections). symbol regardless o
37、f the actual division of voltage across the filament, 8.4 8.5 RS-206-C Page 5 8.6 In multi-section types having equipotential cathodes, it shall be permissible to show the sections at any convenient position with respect to the cathode symbol. When cathodes are brought out to separate terminals, the
38、 electrodes wiI1 be associated with their respective cathodes. 9. RULES APPLYING TO SUBMINIATURE TYPES 9.1 For subminiature types the terminals shall be indicated by small circles tangent to the envelope symbol regardless of terminal length or relative rigidity. 9.2 For butt.on-base subminiature tub
39、es, when the terminals are in circular array, the terminals shall be oriented in accordance with approximate angualr location. 9.3 For subminiature tubes in which the base terminals emerge from the base in essentially a linear arrangement,” the terminals will be graphi- cally depicted within a maxim
40、um angle of 150 degrees around the circular envelope symbol. (See Figure 2). An alternative, the envelope may be shown with straight sides and semi-circular ends, with the terminals along the bottom straight side. (See Figure 2A). 10. RULES APPLYING TO PHOTOTUBES AND CAMERA TUBES On phototube and ca
41、mera tube diagrams, an arrow or note, or both shall be shown to state the direction of incident radiation (visible light, etc.) into the tube. 11. RULES APPLYING TO GAS-FILLED TUBES A dot to indicate a gas-filled tube may be used where desired without changing the diagram designation. It is not, how
42、ever, to be considered a portion of the TEPAC basing or terminal diagram. 12. RULES APPLYING TO ELECTRICAL COMPONENTS Electrical components (such as: resistors, capacitors, inductors, etc.,) that are integral parts of the tube and are important to its functional operation shall be shown in the stand
43、ard manner. 13. ILLUSTRATION OF APPLICATION OF RULES See following pages. EIA 206-C 80 = 3234600 0062749 2 W RS-206-C Page 6 ILLUSTRATIONS OF APPLICATION OF RULES FOR PEEPARATION OF BASING AND TERMINAL DIAGRAMS Recommended Practice Rule Recommended Practice Rule SUBMINIATURE EIGHT LEAD BUTTON TYPE 4
44、R S/NC 6AD 6W 7.3 9.1 9.2 4.1, S/NC 7.2 7.3 7.7 11. 4.1, S/NC 7.1 7.2 7.3 7.7 8.2 7.1 7.3 7.7 8.5 FIG. 2 FIG. 2A SUBMINIATURE “IN-LINE” TYPES 7AJ 7.2 7.3 9.1 9.3 7.2 7.3 9.1 9.3 4.1, IS 7.2 7.3 7.7 8.2 8.3 8.4 8.6 4.1, S/NC 7.1 7.2 7.3 7.7 EIA 206-C 80 m 3234600 0062950 9 m RS-206-C Page 7 RW - 4c m
45、 5BN DIRECTION OF LIGHT PERPENDICULAR TO LARGE END OF BULB 8BL Recommended Practice Rule 4.1, S 4.1, IC 7.1 7.3 7.7 8.6 7.3 7.7 8.3 4.1, IC 7.1 7.3 7.4 7.7 10. 4.1, S 7.1 7.3 7.7 8.1 8.2 8.4 Recommended Practice Rule t.1, S/NC 5L S/NC ($g$p 1 5BE ON LONG PARTOF BULB ON SHORT PART OF BULB - - w VIEWE
46、D FROM SHXT END 6R 4BG DIRECTION OF LIGHT 7.2 7.3 7.7 8.2 8.4 7.3 7.4 7.7 7.1 7.3 7.7 7.9 7.2 7.3 7.7 10. RS-206-C Page 8 EIA 206-C 80 3234b00 00b295L Om Recommended Practice Rule Recommended Practice Rule - 12AQ INDEX = LARGE LUG o = PIN CUT OFF 7.2 7.3 7,7 8.1 12. 4.1, IC 7.1 7.2 7.3 7.6 7.7 8.1 4.1 7.1 7.2 7.3 7,5 7.7 9AJ 9PB rn ,7,1 7.2 7.3 7.6 7.7 8.2 4.1, PIC 7,1 7.2 7.3 7.7 8.3
