1、- - - _. MIL-T-2883b bb 9797906 03361106 O W MIL-T-2 b 816 (EC) 4 April 1975 MILITARY SPECIFICATION TIME-FREQUENCY STANDARD, DISCIPLINED, AN/URQ-, GENERAZ, SPECIFICATION FOR This specification is approved for use by all Departmentsand Agencies of the Department of Defense. 1. SCOPE 1.1 This specific
2、ation covers the performance requirements for a disciplined time-frequency (DTF) standard with Time Base and Frequency Control. The standard provides standard time and frequency signals of a.high order of frequency accuracy and is capable of being phase locked to an external frequency signal and syn
3、chro- nized to an external time signal, as well as providing frequency memory capability to retain the frequency accuracy of the standard and remain at its last frequency after a loss of input signal. 1.2 Classification. Standards covered by this specification shall be of the following classes as sp
4、ecified. to be phase locked to some standard input frequency. chronizable 1 pulse per second (PPS) generator. Frequency control refers to the capability Time base refers to a syn- 1.2.1 Class 1. Standard shall operate continuously over MIL-E-16400 class 4 temperature range of OC to +5OoC at ground l
5、evel and up to 10,000 feet altitude (20.6 in Hg). 1.2.2 Class 2. Special shall operate continuously over MIL-E-16400 class 2 temperature range of -28OC to +6SoC at ground level and up to 10,000 feet altitude (20.6 in Hg). 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on
6、date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-A- 862 5 MIL-P- 15 O 2 4 MIL-E-15090 MIL-E-16400 MIL-E-17555 .I /. - Anodic Coatings, for Aluminum and . Auminum Alloys - Plates, Tags and Bands for Ident
7、ification of Equipment - Enamel, Equipment, Light-gray (Formula No. 111) - Electronic, Interior Communication and Navigation Equipment, Naval Ship and Shore: General Specification for Accessories, and Repair Parts, Pack- aging and Packing of - Electronic and Electrical Equipment, FSC 6625 z Provided
8、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T -21 2 O O . - - Test Equipment for Use with Electronic and Electrical Equipment, General Specification for MIL-C-4 5662 - Calibration System Requirements - Cable Assembly, Electronic Test Equip- ment, (3
9、Wire, 3 Prong, 125 Volt, Molded) Grounding Plug Connector, and Terminal Lugs, 60 Hertz MIL-C-2877712 .STANDARDS MILITARY MIL-STD-105 MIL-STD-108 MIL-STD-454 MIL-STD-461 MIL-STD-462 MIL-STD-471 MIL-STD-781 . MIL-STD-810 MIL-STD-1364 MS-3102 HANDBOOKS MILITARY HDBK-217 MIL-HDBK-4 72 - Sampling Procedu
10、res and Tables for Inspection by Attributes - Definition of and Basic Requirement for Enclosure for Electric and Electronic Equipment - Standard General Requirements for Elec- tronic Equipment - Electromagnetic Interference Character- istics Requirements for Equipment - Electromagnetic Interference
11、Character- istics , Measurement of - Maintainability Demonstration - Reliability Tests: Exponential - Environmental Test Methods . - Standard General Purpose Electronic Test - Connector, Receptacle, Electric, Box Dis tribution Equipment Mounting - Reliability Stress and Failure Rate Data for Electro
12、nic Equipment - Maintainability Prediction (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) The following documents form
13、a part of this speci- 2.2 Other publications. fication to the extent specified herein. in effect on,date of invitation for bids or request for proposal shall apply. Unless otherwise indicated, the issue Specification and Measurement of Frequency Stability, John H. Shoaf, NBS Report 9794. 2, I Provid
14、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-28816 (EC) CHARACTERIZATION OF FREQUENCY STABILITY James A. Barnes et al, IEEE Transactions on Instrumentation and Measure- ment, Vol. IM-20, No. 2, May 1971. (Application for copies should be addressed
15、 to the Institute of Electrical and Electronics Engineers, Inc., 345 East 47th Street, New York, New York 10017). Technical society and technical association specifications and standards are generally available for reference from libraries. technical groups and using Federal agencies. They are also
16、distributed among 3. REQUIREMENTS 3.1 First article sample. Prior to beginning production, four samples shall be tested as specified in 4.3 (see 6.2.1). 3.2 General. hereinafter specified. The standard shall be in accordance with MIL-E-16400 except as 3.3 Functional description. The DTF standard is
17、a low noise precision standard with excellent short term stability characteristics and a frequency memory capability. It generates ultrastable standard frequencies of.5 megahertz (MHz), 1 MHz, and 100 kilohertz (Hz) which are capable of being phase-locked to an external 1 or 5 MHz input signal; and
18、a time base of 1 PPS which Precautions that must be followed to preclude adverse affects and Other methods.and 3.18 Workmanship. Workmanship shall be in accordance with Requirements 9 and 32 of MIL-STD-454 and as specified herein. 19 Provided by IHSNot for ResaleNo reproduction or networking permitt
19、ed without license from IHS-,-,-MIL-T-288Lb 66 m 77777Ob 0336425 4 MIL-T-28816 (EC) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as speci
20、fied herein. fied in the contract or purchase order, the supplier may use his own or any other facility suitable for the performance of the inspection requirements spec- ified herein, unless disapproved by the Government. The Government reserves the right to perform any of the where such inspections
21、 are deemed necessary to assure supplies and services con- form to prescribed requirements. Except as otherwise speci- inspections set forth in the specification 4.1.1 Government verification. All quality assurance operations performed by the supplier will be subject to Government verification at an
22、y time. Verifi- cation will include: (a) surveillance of the operations to determine that practices, methods, and procedures of the written quality program are being pro- perly applied, (b) Government product inspection to measure quality of product to be offered for acceptance, and (c) Government p
23、roduct inspection of delivered products to assure compliance with all inspection requirements of this Specifica- tion. Failure of the supplier to promptly correct deficiencies discovered by him or of which he is notified shall be cause for suspension of acceptance-until cor- rective action has been
24、made or until conformance of product to prescribed criteria has been demonstrated. 4.2 Classification of examination and tests. The method of examination and -testing shall be classified as follows: (a) (b) First article inspection (see 4.3) Quality conformance inspection (see 4.4) (1) (2) (3) *Envi
25、ronmental tests (see 4.4.3) (4) Production inspection (see 4.4 .i) Production control inspection (see 4 4.2) Inspection of preparation for delivery (see 4.6) (c) Reliability tests (see 4.4.4) (d) Maintainability demonstration (see 4.4.5) 4.2.1 Test equipment. The equipment specified in Table VI11 sh
26、all be used to conduct the tests specified herein. in accordance with the requirements of MIL-C-45662. Such test equipment shall be calibrated 4.3 First article inspection. Unless otherwise specified (see 6.2.1), four units shall be required or first article inspection. spection shall consist of all
27、 examination and testing necessary to determine compliance with the requirements of this specification, shall include the tests specified in Table IX. First article in- First article inspection 20 .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
28、L-T-2 8 81 6 (E C) pecified type or equivalent required characteristics Table VIII. Test equipment. Acceptable alternate systems I Ctem 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Functional title .eference Frequency luartz Crystal omputing Counter/ Keyboard ime Interval Plug-in for Item 3
29、 pectrum Analyzer ave Analyzer iigital Recorder for lariable Standard use with Item 3 Auto-Transformer Xltered DC Power Uxer/Trigger ktenuator, 12 dB, ittenuator, 120 dB, Supply Plug-in 1 dB steps, 50 ohms 10 dB steps, 50 ohms Chamber Cnvironmental Test Crror Multiplier licrowave Multiplier 1s cil l
30、o scope Expanded Scale AC Vo 1 tme t er DC Connector Digital Phase Comparator 50 ohm Feedthrough Termination TTL Load Box HP 506lA FEI FE-150A HP 5360A/5375A HP 5379A HP E03-8553B GR 191OA HP 5050B Capable of output in excess of 132 Volts AC, 25 Watts Electro Model EFB HP K10-5061 HP 3556 HP 355D FE
31、I FE-47A FEI FE-6086A Tektronix 454 Simpson 1349 ITT Cannon MS 3106-R10SL-35 (C) FE-40A FEI 10971-2640 FEI FE-6101A or HP110488 I 21 ($ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-ZBBLL bh I 7779706 OL3b1i27 m ._ - - - MIL-T-28816(EC) c O 3 r, al m rl al d u rl U d (UUT). Inputs: 115 VAC/6O Hz 5 MHz reference signal from standard 30 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
