NAVY MIL-E-81512-1968 ENCODERS SHAFT POSITION TO DIGITAL CONTACT TYPE ALTITUDE REPORTING GENERAL SPECIFICATION FOR《一般规格数字轴转移接触式编码器海拔报告》.pdf

1、MIL-E-LSL2 57 m 7977706 0077350 T Rotation Capacity Logic Resolution 1.2.1.3 1.2.1.4 1.2.1.5 1.2.1.6 M I L - E-81512 18 December 96 Modification 1.2.1.7 NIIIJTARY SPECIFICATION ENCODER, SHAFT POSITION TO DIGITAL, CONTACT TYPE, ALTITUDE REPORTING; GENERAL SPECIFICATION FOR This specification is manda

2、tory for use by all Depart- ments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification covers the requirements for a contact type altitude reporting encoder. 1.2 Classification - 1.2.1 Nomenclature - The nomenclature shall consist of the item name, followed by a type designatio

3、n (see Table I). TABLE I NOMENCLATURE ITEMNAME I i Encoder, Shaft Position-to- Dig- ital, Contact Typet Size Altitude Report- ing j 1.2.1.2 I 1.2.1.1 1.2.1.1 Item name - In ail cases the item shall be “Encoder, Shaft Posi- -. tion to Digital, Contact Type, Altitude Reporting. 11 i- ; I I Provided by

4、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E- 81512 1.2.1.2 - Size - The first two digits of the type designation shall indicate the maximum diameter of the encoder in tenths of an inch. is not a whole nuder of tenths, the next higher tenth shall be us

5、ed. the maximum diameter 1.2.1.3 Rotation - The direction of shaft rotation for increasing count, as viewed from the shaft end of the encoder, is denoted by the following symbols : Clockwise rotation - CW Counterclockwise rotation - CC 1.2.1.4 four digit number, following the size, indicating the ma

6、ximum design altitude of the encoder in hundreds of feet. Capacity - The capacity of the encoder shall be designated by a 1.2.1.5 Logic - Whether the contact selection is accomplished internally or externally shall be designated by one letter as follows: Internai Logic - I External Logic - E 1.2.1.6

7、 Resolution - The resolution of the encoder shall be designated by a two digit number to indicate the number of discrete counts in hundreds per 360“ of the input shaft. L2.1.7 Modification - The lower case letter !aTr following the resolution desig2ation indicates the original or basic issue of an e

8、ncoder type. Subsequent mod- ifications which affect interchangeability are designated by succeeding letters in the lower case alphabet except that Itill, “I“, and “0“ shall not be used. 1.2.2 Illustration - An encoder bearing the type designation llCC1267180a. is one with the following characterist

9、ics: Size - More than 1.00 inches but not more than 1.10 inches. (11) Rotation - Counterclockwise as viewed from the shaft extension Capacity - 126,700 feet (1267) Logic - internal (I) Resolution - 8000 feet per turn (80) Modification - original issue (a) end for increasing count (CC) 2. APPLICABLE

10、DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent speci- fied herein. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MPL-E-BL5L2 59 m 9

11、999906 0077352 3 m MIL-E- 8 1512 SPECIFICATIONS Military MIL-D-1000 IL1ITL- E - 54 O O MIL-6- 7742 MIL- P- 7936 NIILW-16878/4 MIL- N- 18 30 7 MILS- 19 500 MILB-22205 STANDARDS Military MI LSTD- 10 5 MILSTD- 143 MIL-STD-454 MIL- STD-46 1 MIL ST -46 2 MIL- STD-46 3 I MIL-STD- 810 Drawings, Engineering

12、 and Associated Lists Electronic Equipment, Aircraft, General Speci- fication for screw Threads, Standard, Optimum Selected Series, General Specification for Parts and Equipment, Aeronautical; Preparation for Delivery Wire, Electrical, Type E, 200 and 260“ Cy 600 Volts, (Insulated, High Temperature)

13、 Nomenclature and Nameplates for Aeronautical Elec- tronic and Associated Equipment Semiconductor Devices, General Specification for Bags, Transparent, Flexible, Heat-Sealable, for Packaging Applications I Sampling Procedures and Tables for Inspection by Attributes Specifications and Standards, Orde

14、r of Precedence for the Selection of Standard General Requirements for Electronic Equipment Electromagnetic Interference Characteristics Require- ments for Equipment Electro magnetic Interference Characte ris tics , Meas- urement of Definitions and System of Units, Electromagnetic Interference Techn

15、ology Environmental Test Methods for Aerospace and Ground Equipment (Cc?ie,c of F w:ifications, stmclardF, drawirigs, a id publications required 5: 1. . - - *- 3 , #- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-E-81512 - 57 9777706 0077353 5

16、 I MIL- E- 81 O 12 suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications - The following documents form a part of this specification. Unless otherwise indicated, the issue in effec

17、t on date of invitation for bids shal: apply. U. S. National Standard for Common System Component Characteristics for the IFF Mark X(SIF)/Air Traffic Control Radar Beacon Systems SIF/ATCRBS. (Copies of the FAA document may be obtained from the Federal Aviation Agency, Washington, D. C. 20553. ) 3. R

18、EQUIREMENTS 3.1 Specification sheets - The individual item requirements shall be as specified herein and in accordance with the applicable specification sheets. In the event of a conflict between this specification and the specification sheet, the specifi- catioil sheet shall prevail. 3.2 Qualificat

19、ion - The encoders furnished under this specification shall be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids. 3.3 Quality conformance - Each encoder furnished under this speci- fication shall have demonstrated that it fulfills

20、all of the requirements of this speci- fication by sztisfactorily performing all of the acceptance tests specified herein and Seing one of a lot from which representative units have passed the specified sampling tests. . 3.4 Materials - Materials used in the manufacture of encoders shall be suitable

21、 for the purpose, and shall conform to the applicable Government specifi- cation. Materials conforming to contractors specifications may be used provided that the specifications are approved by the Government and contain provisions for adequate tests. The use of contractors specifications will not c

22、onstitute a waiver of Government inspection. 3.4.1 Metals - 3.4. l. l Metals shall be of a corrosion resistant type or suitably pro- cessed to resist corrosion. Cissmilar met:ls - Dissimilar meta-s ac defined in MIL-STD- 45 L s ia11 lot be uwc in intimate ccntact w:th each other un.-?ss suitab!? pro

23、tected - - 3. 4 1. 1 :ignin.;t -.lvcLrolytt: xmosion. .Fey- L - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- flIL-E-L5L2 57 m 7977706 0077354 7 m MIL-E-81512 3.4.1.3 Non-magnetic materials - Non-magnetic materials shall be used for ail parts exce

24、pt where magnetic properties are essential, 3.4.1.4 Magnesium - Magnesium or magnesium alloys in any form shall not be used. 3.4.1. .5 Aluminum - Aluminum alloy parts shall be in accordance with MJL-E- 5400 3.4.1.6 Nonferrous materials - Nonferrous materials shall be used for all parts, except where

25、 ferrous materials are essential. 3.4.1.7 Housings - Encoder housings shall be fabricated from uncoated, corrosion-resistant aluminum alloy or corrosion-resistant steel to insure maximum electrical bonding between housing and mating surfaces. This shall be required of encoders to insure compatibilit

26、y with the electromagnetic interference require- ments of 3.5.8. 3.4.1.8 Rotor shaft - Rotor shafts shall be fabricated from corrosion resisting steel, having a hardness equivalent to Rockwell (220-32. 3.4.1.9 Bearings - Corrosion-resisting ball bearings ABEC Class 5 or better of the radial-thrust t

27、ype shall be used on the encoder input shaft. Higher precision bearings shall be used in applications where bearing runout will cause a shift of one-half count or greater on the least significant digit. This latter require- ment shall be observed as the maximum permissible bearing error. 3.4.1.10 El

28、ectrical contact- - Under storage and use environments, elec- trical contact surfaces shall not form chemical combinations resulting in films of higher electrical resistivities than the parent metal, - 3.4.1.11 Semiconductors - Silicon semiconductors conforming to MIL-S- 19500 shall be used througho

29、ut in encoders requiring semiconductor devices. The reverse bias impedance of isolating diodes when used shall be not less than one megohm throughout the range of operating temperatures. 3.4.2 Non-metallic materials - 3.4.2.1 Fungus resistance - Materials which are nutrients for fungi shall not be u

30、sed. 3.4.2.2 not liberate corrosive or toxic fumes or vapors in the rmge of operating tem- peratncs spccified. Fumes - Materials used in the construct?on of encoders shall 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I flIL-E-BL5L2 57 m 7977706

31、0077355 7 MIL-E-81.512 3.4.2.3 Combustion - Materials used in the construction of encoders shall not produce or liberate toxic fumes when burned. Materials shall not sustain combustion. 3.4.2.4 Plastics - Plastics shall be of such composition and workmanship to conform with all aspects of this speci

32、fication in the manufacture of the er_d item. 3.4.2.4.1 impregnating and potting compounc!s - If impregnating compounds, potting compounds, or both are used, then tiley shall not at any time, either during application or during service life, hsve any injurious effect upon zny of the other materials

33、used in the encoder. Such compounds shall neither crack nor flow throughout the range of operating and storage temperatures specified in the applicable specification sheet. 3.4.2.4.2 Cast or moulded thermosetting materials - When used for insulation, parts fabricated from cast or moulded thermosetti

34、ng plastic materials having a moisture absorption of 1.04 percent or greater, shall be dried and impregnated with a suitable material after all machining and punching operations have been completed. c - - _. 3.4.2.5 Protective coatings - All encoder parts shall be suitably protected so as to be resi

35、stant to destructive deterioration cansed by the corrosive conditions experienced in service, Destructive deterioration shall be construed as being any type of corrosion which could in any manner prevent the encoders from meeting performance requirements of this specification during service life. Wh

36、ere cleaning operations on metal parts are not specified in detail, they shall be in accord- ance with approved government specifications or commercial practices which will not cause any subsequent corrosion, Any procedure which would cause maloperation or unreliabilty shall not be used, - - 3.4.3 S

37、election of Government documents - Specification 3 and Standards for necessary commodities and processes not specified herein shall be selected in accordance with MIL-STD-143 except as specified in 3.4.3.1 and 3.4.3.2. 3.4.3.1 Standard parts - Military standard parts shall be used wherever they are

38、suitable for the purpose and shall be identified on the drawings by their Military Standard part numbers. 3.4.3.2 - Commercial parts - Commercial parts having suitable properties shall be used when on the date of invitation for bids there are no suitable Military Standard parts. In any case, commerc

39、ial hardware such as nuts, bolts, washers, etc. , having suitable properties niay be used; providing that: (al T3ey can be rep:.aced by Milit; ry F.tandard parts wvithou-: alteraticr t3 pazts or ILqui 2ment. Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from

40、IHS-,-,-MIL-E-L512 57 H 7777906 0077356 O MIL-E-81512 (b) The corresponding Military Standard part numbers are referenced in the parts list and if practicable on the contractors drawings. 3.4.4 Lubricants - AI1 vendors shall use lubricants consistent with all requirements of the applicable specifica

41、tion sheet (e. g. temperature, life, speed, and environmental conditions). 3.4.5 Soldering - Soldering shall be in accordance with MIL- STD-454. 3.4.6 Terminal lead wire - Electrical wire used for terminal leads shall conform to MIL-W-16878/4. 3.4.7 Internal wiring - Internal wiring shall be in acco

42、rdance with MIL-E-5400. 3.4.8 Electronic components - Electronic components shall be in accordance with MILE- 5400. 3.5 Design and construction - 3.5.1 Threaded parts - Screw threads shall conform to MIL-S-7742. 3.5.2 Physical characteristics - The following physical characteristics shall be as spec

43、ified in the applicable specification sheet. (a) Overall dimensions (b) Mounting dimensions (c) Shaft dimensions (d) Weight (e) Code range (f) Scan (logic) (g) Function (h) Capacity (i) Resolution (j ) Full count revolutions (k) Starting torque (i) Running torque (m) Operating speed (n) Slew speed (

44、o) Radial play (P) Encl Play (4) Shaft rcn-out (r) Shaft perpendicularity (s) perati:ig temperature range (i) Lez,d wire size Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-L5L2 57 9979706 0077357 2 3.5.3 Direction of shaft rotation - Direct

45、ion of the shaft rotation (as noted in accordance with 1.2.1.3) shall be as viewed from the shaft extension ekd of the encoder, The shaft shall be capable of continu- ously rotating freely in the clockwise and in the counterciockwise direction. 3.5.4 Interchangeability - All encoders .having the sam

46、e nomencla- ture shall be mechanically and electrically interchangeable without change to the encoder, existing parts, or associated circuitry. 3.5.5 Code range - 3.5.5.1 Multi-turn encoders - Multi-turn encoders shall consist of 80 discrete counts for 360“ rotation of the input shaft. Each count sh

47、all be equivalent to 100 feet of altitude change with the code starting at -1200 feet of altitude with a maximum design altitude of 126,700 feet. equivalent altitude, The code shall be capable of an altitude range up to the design ;- 3.5.5.2 Single-turn encoders - Single-turn encoders shall be capab

48、le of digitizing altitude from -1200 feet to the design altitude. 3.5.6 in conformance with Table II. The minimum lead length shall be as specified in the specification sheet. Each lead shall be capable of undergoing the test in accord- ance with 4.4.4 without insulation damage, breakage of strands,

49、 or lead pullout. Wire lead identification - Wire leads shall be color coded TABLE II IDENTIFICATION OF LEAD WIRES ENCODER LEAD Common =2 =4 A2 A4 COLOR White-blue tracer White-yellow tracer White-brown tracer White Grey Blue ;- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_I_ - ._ -. -_ - - - . .- MIL-E-81512 57 = 779970b 0077358 Y MIL