1、“Tbie material containe information af- C-MIL-T-21671 (NOrd) fecting the national defenae of the United StaMe within the meening of the espionage laws, title 18, U. S. c, BCCS 793 and 794, the transmission or revelation of which in any manner to an unauthorim pereon ia pro- hibited by law.” 18 Novem
2、ber 1958 SUPERSEDING NAVORD OS 5869B 9 March 1955 9- ;Ir MILITARY SPECIFICATION i c i I!- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 C-MIL-T-21671 (!Ti)rd 1 MIL-D -3464 MIL-S -6872 STANDARDS MILITARY- MIL-STD-105 MIL-STD-129 DRAWINGS BUREAU OF
3、 ORDNAACE LD 274820 LD 284866 1476194 Desiccants, Activated, Bagged, Packaging Use and Static De- humidification. Soldering Processes, General Specifications for. Sampling Procedures and Tebles for Inspection by Attributes. Marking for Shipment and Storage, Test Set Mark 126 Mod O, Preparation for D
4、elivery for Test Set Cable Assemblies, Marking Instructions for Storage and Shipping Containers, And all documents listed in the above LDs and drawing. PUBLICATIONS BUREAU OF ORDNANCE OP 400 General Instructions for the Design, Manufacture and In- spection of Naval Ordnance Equipment (Copies of spec
5、ifications, standards, drawings, and publica- tions required by contractors in connection with specific procurement functions should be obtained from the rocuring activity or as directed by the contracting officer P . 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
6、ense from IHS-,-,-MIL-T-2167L 66 m 7777706 0130b 3 = , C41L-T-21671 (Kord) 30 REQUIREMENTS 3 .I General reauirements. 3.1.1 The Test Set Mark 126 Mod O shall be manufactured in accordance with LD 274820 and all documents listed there- on. 3.1.2 The requirements and procedures established in OP 400sh
7、all be complied with as applicable. 3.1.3 PreDroduction samle. - Unless otherwise speci- fled in the contract or order, a preproduction sample shall be manufactured by the same procedures and processes and at the same location as proposed for full production. This sample will be tested for the purpo
8、se of determining com- plicance with the requirements of this specification, the drawings, and the contract. See 4.1.2. 3.1.4 Interchanaeability. - Component parts of assembled units (unless otherwise specified on the applicable drawings) fabricated in strict agreement with their applicable drawings
9、 shall be interchangeable and shall assemble with mating com- ponents of the unit without selection or fitting. If during assembly of the fabricated parts of a unit, selection or fitting is required and changes in dimensions are necessary, no changes in the parts as delineated on applicable draw- in
10、gs shall be made without prior approval of the Bureau of Ordnance. 3 .2 Moisture-and fungus-resistant treatment. - Mater- ials and parts of this test set which are not moisture and fungus resistant shall be treated, before assembly, with a varnish conforming to Military Specification MIL-V-173. from
11、 this specification, applicable drawings, specifications, publications, materials and processes specified herein, shall be as set forth in OP 400. ments arising between this specification or any specifica- tions, publications, or drawings listed herein shall be referred in writing to the procuring a
12、gency or appointed agent for interpretation and clarification. 3.3 Reauests for deviation. - Requests for deviation 3.4 Conflictinn reauirements. - Conflicting reqnire- 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-C-MIL-T-21671 (Nord) 3.5 Solder
13、inq. - Unless otherwise specified, solder- ing processes-shall conform to the requirements specified in Military Specification MIL*-6872. Only non-corrosive and non-volatile fluxes shall be used. Rosin shall be used when soldering wires to contacts and terminals. The use of rosin core solder is perm
14、itted. Electrical connections shall be mechanically secure and electrically continuous before soldering. Sufficient heat shall be applied during the solder- ing process to avoid cold“ solder joints. wherever possible. 3 .6 Wirinq. - All Internal wiring shall be cabled 3.7 Perf ormanc e reouirements
15、an d Drodnct character- istics. - The test set covered by this specification shall tneet the following performance requirements and product characteristics. 3 07.1 Insulation resistance, - The insulation resist- ance between electrical circuits and between each circuit and the chassis shall be not l
16、ess than 50 megohms when tested as specified in 4.5.3. bration and percentage controls shall adjust the inagic eye“ tub to within the specified limits, when tested as speci- fied in 4.5.4. 3.7.2 Calibration and B ercentane control. - The Cali- 3.7.3 that are supplied with the test set connected betw
17、een ADAPTER CABLE pins and binding posts indicated, the percentage con- trol shall indicate O t2 percent when tested as specified in 4.5.5. 3.7.4 SELECTOR switch, - An external ohmmeter shall read as specified when the SELECTOR switch circuitry is tested as specified in 4.5.6, ADAPTER CABLE connecto
18、r. -With the components 3.7.5 SENS. SW. CAP. connector. - An external ohmmeter shall read as Specified when the SENS. SW. CAP. circuitry is tested as specified in 4.5.7. be free from dust, dirt, metal filings, moisture, solder splashes, chips, and other foreign matter. Necessary pre- cautions shall
19、be taken during manufacture and assembly to Insure these conditions. 3.8 Workmanshlb and cleanliness. - The test set shall . 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2L672 66 7797706 0330470 L = -. C-MIL-T-21671 ()Tord) 4. 4 .I QUALITY
20、 ASSURANCE PROVISIONS AND TEST REQUIFEMENTS . Samlinq. - Unless otherwise specified, and when applicable, the sampling plans and procedures used by the Government inspector in the determination of the acceptability of products submitted by a supplier for Government inspection will be in accordance w
21、ith the provisions of MIL-STD-105. - Lot. - As applied to the Government inspection of units of product, the term lotff shall mean “inspection lot“, i.e. a collection of units of the product used as a basis for Government inspection. the number of units of product in “inspection lots“ shall be as de
22、termined by the Government Inspector, and may differ from the quantity designated in the contract or order as a lot for production, shipment or other purpose. PreDroduction samDle, - Unless otherwise speci- fled for each contract or order, a representative sample of one test set shall be manufacture
23、d using the methods and pro- cedures proposed for full production. The Government in- spector shall perform, witness, or participate in such inspections and tests on the sample as are required for full production. Upon conditional acceptance by the inspector, the preproduction sample shall be forwar
24、ded, together with a report of Inspection, to an activity designated in the contract or by the procuring agency, for the purpose of determining compliance with the requirements of the contract, specifications and drawings. Further production of the item by the contractor prior to approval of the con
25、tracting activity or the completion of the tests on preproduction samples shall be at the contractors risk. samples accepted will be applied as part of the quantity speci- fied by the contract or order. 4.1.1 Unless otherwise specified, 4.1.2 Preproduction 4.1.2.1 eDroduction samle for a subseauent
26、contract. - The necessity for a preproduction sample will be determined by the procuring agency when production under a new contract by the same contractor at the same location follows the manufacture of satisfactory material as covered by this document. Provided by IHSNot for ResaleNo reproduction
27、or networking permitted without license from IHS-,-,-MIL-T-ZLb7L bb 77777Ob OL3OLi7L 3 = 4.2.1 Government insDection. - The Government inspector will make such inspections as are necessary to determine that all components and assemblies are in accordance with the requirements of the contract, pertin
28、ent specifications, and drawings. Unless otherwise specified, these inspections will be conducted in accordance with instructions contained in OP 400. 4.2.2 Contractors inspection. - Contractors inspection shall be conducted in accordance with provisions of by Contractor“ as contained in OP 400. tes
29、ting of test sets covered by this Uocument shall be classi- fied as follows: 4.3 Classification of tests. - The inspection and (a) preproduction tests (b) acceptance tests Premoduction tests. - Preproduction tests are 4.3.1 those performed on samples submitted in accordance with 4.1.2 to determine t
30、hat the lot and production meet all the require- ments of this specification. 4.3.2 Acceptance tests. - Acceptance tests for accept- ance of the test set covered by this specification shall con- sist of tests to determine compliance with all requirements specified in this document 4.4 Test eauipment
31、. 4.4.1 Test and inmection eauiDment and facilities. - Unless otherwise specified, the manufacturer shall furnish and maintain all necessary test equipment, facilities and personnel for performing all.acceptance tests under the supervision of the Government inspector. The test equipment shall be ade
32、quate in quantity, and unless definite require- ments are specified, they shall be of sufficient accuracy and quality to permit performance of the required acceptance tests. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-21671 bb M 7779706 0
33、330q72 5 C-UL-T-21671 (F:Ord) 4.4.1.1 Equipment required for performing these tests is as follows: (a) ll5-volt, 60 cycle, a-c supply. (b) Ohmmeter, ranges O to 5, 1000, 5OO0, 1000,000, and 500,000 ohms, accuracy within *2 percent. (c) Megohmmeter, 5-volts d-c, range 10.0 to 100 megohms, accuracy wi
34、thin *lo percent 4.5 Tests. 4.5.1 Test conditions. - Unless otherwise specified, tests shall be performed at 80 *10T and ambient relative humidity. 4.5.2 Visual dnsDection. - The test set and its com- ponent parts shall be inspected to verify that the materials, design, construction, physical dimens
35、ions, soldering, and workmanship are in accordance with this document and the drawings. 4.5.3 Insulation resistance. - The test set shall be subjected to a conditioning period of 24 hours at a temper- ature of 77O f2T, and a relative humidity or 75 *5 percent. A test potential of 500 h20 volts d-c I
36、s then applied as specified in 3.7.1 using megohmmeter, test item 4.4.1.1 (c). The insulation resistance shall be not less than 50 megohms. 4.5.4 Calibration and Dercentane control test. (a) Connect test set AC plug to ll5-volt, 60-cycle power supply, test item 4.4.1.1 (a). (b) Set PWR switch at ON
37、and allow 5 minutes for the set to warm up. (e) Connect one 20,000-ohm resistor (supplied with set) to STANDARD binding posts. (d) Connect other 20,000-ohm resistor (supplied with set) to UNKNOWN binding posts. 7 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
38、from IHS-,-,-MIL-T-ZLb7L bb 7779706 0330LI73 7 = c C-MIL-T-21671 (Nord) (e) Set SELECTOR switch at RES.-COND. (f) Turn percentage control until minimum opening is observed on “magic eyef1 tube. Opening width shall be between 1/16-inch and 1/32-inch (obtainable with EYE ADJ. control). Loosen setscrew
39、 on percentage control knob and set knob at zero. Tighten setscrew. (g) Remove resistors from binding posts. (h) Connect 50-megohm resistor (supplied with set) to J-N binding posts. (i) Set SELECTOR switch at LKG. J-M. (j) Turn LKG. BAL control until minimum open- ing is observed in “magic eyett tub
40、e. penin width shall be between l/l-inch with BRGOSENS. control. Remove resistor from binding post. Set PWR switch at OFF and disconnect test set from AC power supply. and i/ Q -inch, and shall be obtainable (k) (1) 4.5.5 ADAPTER CABLE connector test. (a) Connect test set to 115-volt, 60-c cle power
41、 supply, test item 4.4.i.i (a J , With CA-731. (b) (c) Connect components (supplied with test Set PWR switch at ON and allow 5 minutes for set to warm up. set) between ADA*ER CABLE pins and bin- ing post as shown below. With SELECTOR switch at positions listed, percentage control shall indicate O 12
42、% when %agit eye“ tube indicates minimum opening. (d) a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SELECTOR Switch Component ADAPTER BINDING Settinn CABLE POST A-# 20,000 ohms A B-N 10,000 ohms B C -N 6,000 ohms C F-N 51,000 ohms F G -N 1.0 mfd.
43、 G N N N N J 4.5.6 (e) Disconnet test set from ll5-volt supply. Ohmmeter shall indicate direct connection between pins J, E, and D of ADAPTER CABLE. SELECTOR switch test. (a) Connect ohmmeter, test item 4.4.1.1 (b) to pin G of SENS. SW. CAP. connector anA pin L of ADAPTER CABLE connector, With SELEC
44、TOR switch set at position listed, ohmmeter shall indicate values shown in table, *10 percent. (b) SELECTOR Switch Ohmmeter indication Settinn (ohms 1 A-N B-N C-M F-N G-N G -A RES, com. INS. RES.) LKG. J-I? ) LKG. DET.) 1935 1460 1460 31 50 i475 42,000-52,000 (ad jus t- able with percent con- trol)
45、1475 Adjustable from O to 500,000 ohms with BRG. SENS . control . 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-21b71 bb = 777770b 0230Li75 O (c) Set SELECTOR switch at last (not engraved) position. Ohmmeter shall Indicate open circuit . (d
46、) Remove ohmmeter. SENS. SW. CAP. connector test. (a) 4.5.7 Connect ohmmeter, test item 4.4.1.1 (b), to pins listed and set SELECTOR switch as indicated. Ohmmeter shall indicate as shown in following table: Ohmmeter Pin Connections SELECTOR Switch ADAPTER SENS. SW. Ohmmeter Setting CABLE CAP . Indic
47、ation G =A L A 540 ohms *lo$ G-A B-F direct connection G-A C-F direct connection G-A D-F direct connection G-A E -F direct connection INS. RES. J F direct connection 4.6 Criteria for accertance . 4.6.1 PreDroduction testa. - Acceptance of prepro- duction sample shall be based on no defects in the sa
48、mple. 4.6.2 Acceptance tests. - Failure of any test set to pass the acceptance tests shall result In rejection of the number permitted by the associated criteria, the lot repre- sented will be rejected. - test set. If the number of failing test sets exceeds the 5. PREPARATION FOR DELIVERY 5.1 Preser
49、vation and tmckaginq. 5.1.1 Level A. 5.1.1.1 Cleaning and drvinq. - (Not applicable) . 10 _- u 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-C-MIL-T-21671(3 Ord) t 5.1.1.2 Preservative alication. - (Not applicable). 5.1.1.3 Unit tiackaninq. - Prior to unit packaging, test set cables shall be packaged in ac
