1、 . . . ._._. - . . -1- I f . . . . . . , . . 1 . . -, I I . I r* . . I . . 3.1.22.2 Toggle switches. The mounting of toggle switches shall be such . - I . . . . . . . . . . “. - _.“.“ that the handle of the switch operates in the length (vertical) direction of the panel. Any.flOFFft position shall b
2、e in the center or bottom position. When clarification of a control function or convenience of operation would result (for example; a “left- right“ function control), toggle switches may be so mounted that the handle. of the switch operates in the width direction of the control panel. _.“._ “. .- .
3、._“-.“I - . -.-II_- .“-“ .-* ._.“ .-.S. . . . . . -“.“ 3.1.23 Terminals. . Terminals shall be in accordance with . . . -. . “._ . -. -. . “ . I “ . . . .- “.l -.“- . - .- . .“I“ “- -. MIL-STD-454, Requirement 19. “ 3.1.24 Threaded partsi_ Threaded parts shall be in accordance-with . MIESTD-454, Requ
4、irement 12, except that threads shall be in accordance with MIL-S-7742 only, as amplified below: .“._ -.“. (a) Threads for screws, bolts; nuts, and similar devices . shall be chosen from the recommended selection * contained inparagraph titled “Recommended selection, “of MIL-S-7742, unless used for
5、adjustment, when they may be of fine or extra fine thread series. (b) When MIL, AN, or other specifications for components, such as variable resistors and switches, are in conflict . with the requirements of (a), .the requirements of the L“- -_ specification for the component shall apply. E .- “Z -
6、. - “ “ - “- . 2 . . . (c) Commercial threads in general use for mounting. . -, . . . standard components that are not covered by / :c . * 3.1.25 Tools (special). Special tools shall be in accordance with . - -_“ .c . -. . . _ specifications of the military establishment are acceptable. r “ . II “ .
7、-. “. “. I.“r“.- “ F“.“- - “_“ I * 43 . .“._ “- L .-. “ ir, . . -1“ - MIL-STD-454, Requirement 63. L .- -.- ._. - .I“ .“A“. 1. - -.e.- .“.“I. _“ _“.“If. - . - -.-. - 1 “ .“-“ r-.- . “ .- “.“ i“, - . . , . * 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
8、IHS-,-,-. M I L - T - 2 I2 O O L M I 7 7 7 7 7 O b O 3 B 2 7 4 O 3 .;:I-; .- . . -.“- - .“ - . -. - . . . . . . . “ _-_ _.- . , .1 . . . - . . . . . . - i e-.- . ., . . .“ -.- “._ _-._ . d . .- . “ . /:; h. . I . “._. - ._- . .-.a I “. , . ._ . . “. ._ “_. .- .“ . . .-. . . . . . . . 1.- . .-. “.“ -
9、 .- “- .-. U.“- . “ “_“._ . - . .“ . “ . . “ .“ . .“ . : . , . . . “.“-.I“.-.“. “ .-. ._.“. I .-._._. .-.-.- “ .-. . , , . “ . “ . . . . . ._ . r - . . . Electron tubes shall be in accordance with MIL-STD-454, Requirement 29. Metallic oxide recti- fiers shall not be used. . -. -. r _ . I. 3.1.27.1 H
10、eat dissipation. Heat-dissipating techniques shall be used with miniature and subminiature tubes and, when required, with semiconductor devices 3.1.28 Fastening of brittle materials. . Fastening of brittle materials shall be in accordance with MIL-STD-454, Requirement 12. 3.1.29 Structural welding.
11、Structural welding shall be in accordance with MIL-STD-454, Requirement 13, 3.1.30 - Wire (hookup). Hookup wire shall be in accordance with MIL-STD-454, Requirement 20. The size of wire leads supplied integral with parts shall be controlled by the specification for these parts. * 3.1.31 Insulation o
12、n conductors. Sleeve insulation shall be in accord- ance with MIL-STD-454, Requirement 11. Under service conditions sleeving shall not slip to expose the conductor. . . - - “ t ;i. . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . - . “- .“ . I i
13、 NIL-T-21200L NI 774470b 0382743 5 M hCIL-TG.21200L . .:i 3.1.32 Wiring (internal). 3. 1.32.1 . Connections. Connections within the equipment shall be suit- ably supported in such manner as to prevent breakage and eliminate changes in characteristics or output as a result of vibration and accelerati
14、on or shock encoun- tered under the specified service conditions. An uninterrupted wire is preferable to a junction, The following descending order of preference exists when junctions are used, and the choice of the listed junctions shall be determined by consideration . of reliability factors, main
15、tenance factors, and manufacturing processes: . (a) Permanent splices (b) Bolted connections (c) Connectors - - : - - . . -. . . . - Solid wire may be used in the equipment, provided such wire is so insulated or held in place that it does not fail or show excessive motion when the equipment is sub-*
16、 jected to the vibration and shock encountered under the specified service conditions 3. 1.32.2 R.-F connection. Whenever bolts, screws, nuts, studs, or rivets are used in an r-f circuit, all connections thereto shall be securely soldered, except that soldered connections are not considered practica
17、ble at studs of molded phenolic capacitors, meter terminals, and other places where damage from over- heating may result. 3.1.32.3 Clamping. In no case shall electrical connections depend upon wires, lugs, terminals, and the like, clamped between a metallic member and an insulating material of other
18、 than a ceramic or vitric nature. Such connections shall be clamped between metal members, preferably such as an assembly of two nuts, two washers and a machine screw. If suchan assembly is not used, and mainte- nance of a tight connection depends upon the resistance of an insulating material of oth
19、er than a ceramic or vitric nature to compressive stress or shear, such connec- tions shall be securely soldered. 3.1.32.4 . Clearance. Whenever wires are run through holes in metal partttions, shields, and the like, less than 1/8 inch in thickness, the holes shall be . -. - . - . _ equipped with su
20、itable mechanical protection of insulation otherwise subject to abra- sion. Panels 1/8 inch or more in thickness either shall have grommets or shall have the hole edges rounded to a minimum radius of 1/16 inch. . -. . - - ._ i - ._.“ “1“ “ r2-L. - _ E . -.-.- . -.- 3.1.32.5 Cabling. Conductors inten
21、ded to carry pulse or other wave c .“ ._ _“.- _“. .“ t:.“:. p,. r . “2 “.“ .“I.“._ . forms, and which may undesirably couple such signals into other conductors, shall not be bound into a cable. The bending radius of polyethylene cable shall not be less than five times the cable diameter. “ -.- .“. F
22、.“ .“ “ ?r;“ . r . “ -. A- “ . . . .“_ . . . -. .“._ F .“. :- r. .- . “. .“_. “.“. “ “. .* . - . “ _.“. 2 . .“_ , - .- . -.- - . -_ 16 - “.*“ “ . , -. - ?. . . . . . “._ . . . “ “. i T: . .“ . . . :.-.:.:.:.:.: , . I.*-.-.-.*. . . . . 1.- r“ Provided by IHSNot for ResaleNo reproduction or networking
23、 permitted without license from IHS-,-,-. I R 1 L - T - 2 1 2 0 0 L fl 1 7 7 7 7 7 0 b O 3 B 2 7 4 2 7 W I:*.: . . “. .-._.- _ _.“_ _._I_ 1._.T .“ - ing cables, and patch cables which axe of molded construction or terminate in molded or potted electrical connectors shall have extra unused conductors
24、. The number of extra unused conductors shall be compaible with the extra unused con- tacts as specified for electrical connectors in MIL-STD-454, Requirement 10. . . - “ - . “. . “. . “.“_ .“ “.“ t:, U -.“_ . “.-“.-.-, . - .I_._ . “ - “. _“ .-.- *-.-.- .- “. U “ “. “ “- .“. .-“-.“._L . - . .“ “.“ .
25、 “ I . 31.34 Wood Wood shall not be used as an electrical insulator, and . “ the use of wood for other purposes shall be restricted as much as practicable to those parts for which a superior substitute is not known. When employed, it shall be pressure treated and impregnated to resist moisture, - in
26、sects, and decay with a water-borne preservative conforming to TT-W-571, and shall be made fire retard- ant by treatment in accordance with MIL-F-19140. . .- .- - . *.“. “. . . - . I . . . . . * . 3.1.34.1 Sandwich panels. When aluminum-wood sandwich panels are required.by the individual test equipm
27、ent specification, the wood shall not be treated as specified in 3.1.34. The wood used shall conform o NN-P-530 and the adhesive bonding of the aluminum shall conform to “M-A-138. “ . ;: “. ; 3.1.35 Microelectronic devices. Microelectronic devices shall be in E- . .-.- . .“.-. “ _“_ . * -. - - t“ “.
28、_ _. t: S. “. .-.-.- L a.-.-. “*. i-. .: L;rL7.z.,y :.y.:. k“ y: :,7 : “I“ L- . 1 . . : 2:.=z:.7:.:.:.-.:.-.: I. .-. “ . accordance with MIL-STD-454, Requirement 64. Devices selected shall be soldered or welded into the circuit. . . If “* ,- . “._ . .“. . “. “._ 1 . - . . . -“ “_ _ 3.1.36 Parts to m
29、eet reliability requirements. When the contract or L -. “. ., _ .: . b.“ .“ equipment specification includes a reliability requirement that is based on a previ- ous calculation and demonstration of the equipment reliability, the parts used must be equal to or more reliable than those used in the dem
30、onstration equipment. “. . . I r. .r“ . . . * .- -.+. “ . A.- . .“ _.-_ .-. “. - . -.-“- .- “._ .- , .-. 3.1.37 Bearings. Bearings shall be in accordance with MIL-STD-454, ,. ,“._ i “.“ .- . k:.- - .“ . 3.1.38 Flammable materials. Flammable materials shall be in ). . _._. _. 3.1.39 Derating. Deratin
31、g of electronic parts and materials shall be . L*.“L . Requirement 6.- .- . .-. . “ . . . - .“. “ . I ,. . . ,.*. i p. _. . . . . .- “_ L “-.I “_. L . ,“ “ : r “ accordance with MIL-STD-454, Requirement 3. - ._. 1 in accordance with MIL-STD-454, Requirement 18. _I I -_. . _ _ _.“ . * _I.“ -“. 3.1.40
32、 Adhesives. Adhesivesshall be in accordance with MIL-STD-454, kzG;*:.G“z-.:.:.? i“ Requirement 23. The use of adhesives in electrical appIications requires approval of the procuring activity. + :.:z:.-.-y.: I:.:.: r: I“:“: . . . . . 3.1.41 Batteries. Batteries shall be in accordance with MIL-STD-454
33、, I . - .,-“ - -. c- _._._“ “. I.“ - .- .“.* I .- - -._ - “. “.“ I“ - * I . .“._. , . “ -“ Requirement 27. i-.* _ _.,- - Y., 3.1.42 Quartz crystal units. Quartz crystal units shall be in accord- “.“_ ance with MIL-STD-454, Requirement 38. r:“:. “ -. , . . . _* “ . “. . “ . -. *.“ _. I- -_I-_ “.I I.
34、W“_ “. _.“ . YI . “ 3.1.43 Motors, dynamotors, rotary power converters and motor . . generators, Motors, dynamotors, rotary power converters, and motor generators shall be in accordance with MIL-STD-454, Requirement 46. i . 2 -i i 2 “.“._ . c . -a-“ . “ .- . .“._.“ -_._ . . . . / -L “ 2. . . . - 1.
35、18 . -. . . . .“.L . -. . L . “ d ._ . i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_._ .: . MIL-T-21200L NI 7799906 038274i O 9 I . . MIL-T-2120OL 3.1.44 Wavwuides and related equipment. Waveguides and related equipment shall be in accordance w
36、ith MIL-STD-454, Requirement 53, 3.1.45 Glass. All glass used in equipment for protection of instru- merits, meters, cathode ray tube faces, and for viewing dials and indicators shall be clear, presenting no evidence of distortion when viewed from any angle. Con- sideration shall be given to the use
37、 of glareproof glass when the equipment to be viewed will be illuminated from the outside light sources. Where extreme tempera- ture differential may exist between the two faces of viewing glasses or windows with the possibility of moisture condensation resulting therefrom, provisions for the absorp
38、tion of this condensation shall be made. Unless otherwise approved by the procuring activity for each specific application, all glass shall be of the shatter- proof type in accordance with Class 1, Grade C of MIL-G-3787. 3.1.46 Circuit breakers. Circuit breakers shall be in accordance with MIL-STD-4
39、54, Requirement 37, 3.1.47 Gears and cams. Gears and cams shall be in accordance with MILSTD-454, Requirement 48. 3.1.48 Indicator lights. Indicatorlights shall be in accordance with MIL-STD-454, Requirement 50. 3.1.49 Hydraulics. Hydraulics shall be in accordance with MIL-STD- 454, Requirement 49.
40、3.1.50 Rotary servo devices. Rotary servo devices shall be in accord- ance with MIL-STD-454, Requirement 56. 3.1.51 Sockets, shields and clamps. Sockets, shields, and clamps shall be i accordance with MIL-STD-454, Requirement 60. 3.1.52 Brazinff. Brazing shall be in accordance with MIL-STD-454, Requ
41、irement 59. 3.1.53 Organic fibrus material. Organic fibrous material shall be in accordance with MIL-STD-454, Requirement 44. 3.1.54 Coaxial cable (RF. “ Coaxial cable (RF) shall be in accordance with MIL-STD-454, Requirement 65. 3.1.55 Multiconductor cable. Multiconductor cable shall be in accord-
42、ance with MIL.-STD-454, Requirement 66. 3.1.56 . Readouts. Readouts shall be in accordance with MIL-STD-454, Requirement 68. 3.1.57 Electrical Filters. Electrical filters shall be in accordance with MIL-Sm-454, Requirement 70. 19 Provided by IHSNot for ResaleNo reproduction or networking permitted w
43、ithout license from IHS-,-,-. . . “ . - - - MIL-T-EWOCIL mI m wvqob 03az7 2 m MIL-T-21200L . 3.2 Design and construction. i - t . . . L.- -. - “ -. _ . . .- B- “_.-. “ .“ .- . . . 3.2.1 Detailed mechanical and electrical design. The detailed . -. . - - . . “._ . . - “- .U .- .“ - _.“.“ . .- . . ._.“
44、W *.-.-., . -*.- .“.“ “_._. “. - - . . -. .“ .“. “.“ .I .- .-_ .“_. “. “.-“ .-. .“ -.“- . .W _I.“_ .-.“ .“I.“.“.“- . .- - _“. “_“, e.“-. . - . . . mechanical and electrical design of the equipment shall be accomplished by the contractor, subject to the requirements of this specification and any spec
45、ification to which it is subsidiary. The requirements of this specification are detailed only to the extent considered necessary to obtain the desired mechanical and electrical characteristics, performance, and permanence of the same. (See 6.2.) The design layout and assembly of the units and their
46、component parts shall be such as to facilitate quantity production and.to result in minimum size and weight. - . . -, . ._ 3.2.1.1 Mechanized production (including, printed circuits). When designing new equipments, contractors shall include, when possible, circuits that ,. informed of the types of c
47、ircuits selected and the type of facility required to ities consistent with the state of the art. The procuring activity shall be kept . have been or can be reproduced by mechanized or semimechanized production facil- shall govern. produce such circuits. The following factors applicable to this type of constructio
