AIR FORCE A-A-58034-1994 FREQUENCY STANDARD CESIUM《铯频标》.pdf

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1、A-A-58034 m 9999974 0365397 331 INCH POUND October 17, 1994 A-A-58034 COMMERCUL ITEM DESCRIPTION FREQUENCY STANDARD, CESIUM The General Services Administration has authorized the use of this Commercial Item Description ( CID ) for all federal agencies 1. sco PE, This CID, describes a Cesium Frequenc

2、y Standard. This CID is meant as a minimum requirement for the Frequency Standard in which only those manufacturers that meet or surpass the following equirements are qualified per this CID. 2. CLASSIFICATION. Equipment covered by this CID may be commercially available equipment modified to the exte

3、nt necessary to meet the following description. The equipment shall be Type III, Class 5, Style E and Color R in accordance with MIL-T-28800. 3. SALIENT CHARACTERIST ICs, 3.1 Desien and Construct ion, The equipment shall be UL (Underwriters Laboratories) listed and approved and/or shall comply with

4、the type III safety requirements of MIL-T-28800. 3.2 Leak aee Cu rrent Protectioa Protection shall be provided from leakage current in excess of 3.5 milliamperes (ma) rms (AC and DC) from any accessible conductive parts of equipment (including control shafts with knobs broken or removed and recessed

5、 calibration or adjustment controls) to either pole of the power source for any position of the power switch(es). Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this document should be sent to: The Resources and Logistics Services Cen

6、ter, SA-ALC/TILDD, Bldg. 171, Post C-12,485 Quentin Roosevelt Rd., Kelly AFB, TX 7824 1-6524. AMSC N/A FSC 6625 DISTRIBUTION S TATEMENT A, Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-580

7、3Y = 999997Li 0165398 078 A- A-58034 3.3 rated for at least four (4) times the operating voltage. Radio Freauencv Interference (RFI) Cap acitors. Any capacitor used in RFI filters shall be 3.4 Ventilation Openings. (a) Ventilation openings shall be designed to prevent accidental contact with live el

8、ectrical circuits and mechanical moving parts. (b) Top ventilation openings shall incorporate small mesh screening or similar design to prevent the expulsion of hot electronic particles due to failure of electronic devices such as capacitors. 3.5 Desion and Co nstruction, The equipment shall be of s

9、olid state construction. 3.6 lithic or a separate component design. TD - e of Construction. Construction of the Frequency Standard shall be of a mono- 3.7 anal Input and OutDut Co nnect o r s . Unless otherwise specified, all signal input and output connectors shall be type BNC female. 3.8 four (24)

10、 hours at 50C. If forced air is used, it shall be as specified in MIL-T- 28800. Jnternal Cooling. The equipment shall be capable of operating continuously for twenty- 3.9 Forced Air Cool ine Motor . Brushless motors shall be utilized for the forced air cooling motor in the equipment. 3.1 O Air Filte

11、r. Equipment utilizing a cooling scheme which exhausts air from the equipment through the cooling fan shall not require an externally accessible air filter. 3.11 the frequency standard when the internal temperature rises to the degree of possible damage to the electronic components. A minimum of 10C

12、 hysteresis drop from this tripping temperature must occur before circuit power is again applied. 3.12 -cal Power Sou rces. The equipment shall operate fiom nominal commercial, military, and shipboard power sources of 100,ll O, 120,200,220 and 240 volts ac (+i 0%) at line fiequencies of 50 Hz to 400

13、 Hz, and also shall operate fiom a rechargeable, internal battery power source for at least 0.5 hours. The equipment shall also operate from an external 22 to 28 VDC power source. l however, marking identification processes other than the type III requirements specified in MIL-T-28800 may be used, p

14、rovided the marking and identification processes are capable of passing the front panel marking test when tested in accordance with this CID. Marking and Identification. The front panel marking shall comply with the type III parts, 3 Provided by IHSNot for ResaleNo reproduction or networking permitt

15、ed without license from IHS-,-,-A-A-58034 W 9999974 Olb5400 55b W A- A-5 8034 3.22 Environmental Requirements. (a) Temperature Requirements. Unless otherwise specified herein, the equipment shall meet its specified performance characteristics and other requirements when subjected to the Class 5 temp

16、erature requirements and as listed below. (1) Non-operating Temperature. The equipment shall meet its performance and accuracy requirements in an non-operating environment of -20C to +50“C. (2) Operating Temperature. The equipment shall meet its performance and accuracy requirements in an operating

17、environment of 0C to 50C. (b) Humidity Requirements. The equipment shall meet its required performance and accuracy requirements under humidity requirements for Class 5 equipment as specified. (c) Altitude Requirements. The equipment shall meet its required performance and accuracy requirements unde

18、r the altitude requirements for Class 5 equipment as specified. (e) Electromagnetic Interference (EMI). The equipment shall comply with MIL-T-28800. (f) Magnetic Environment. The equipment shall comply with the magnetic environment requirements. 3.23 5 environmental conditions as specified in MIL-T-

19、28800. Reliabilitv. Reliability verification testing, shall be in accordance with the Type III, Class (a) Mean Time Between Failure (MTBF). The equipments MTBF shall be 2,000 hours. The lower test MTBF shall be 2,000 hours and the upper test shall be MTBF 4,000 hours. (b) Prc-conditioning Requiremen

20、ts. Each deliverable equipment shall be capable of being subjected to the environmental screening effects of burn in and thermal cycling, with thermal cycling being accomplished in the sample testing phase. (1) Bum-in. Burn-in shall expose the equipment to extended periods of elevated temperatures,

21、(40C for a minimum of 1 O0 hours). Each equipment which fails during burn-in shall be repaired and fully retested, until failure free. Failures which occur during the bum-in test shall be noted and reported but shall not count toward the establishment of MTBF. Prior to and following burn-in, a satis

22、factory operation test shall be performed. A Satisfactory Operation Check (SOC) shall be conducted at selected times during the burn-in test. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-58034 9 9999574 Olb540l 492 (2) Thermal Cycling. Therm

23、al Cycling shall expose the equipment to hot and cold cycles for Class 5 equipment per MIL-T-28800. Each equipment which fails during thermal cycling shall be repaired and full cycling test shall be noted and reported but shall not count toward the cycling. A Satisfactory Operation Check (SOC) shall

24、 be conducted during the last two upper and lower temperature limits. 3.24 readily accessible calibration adjustments and maintenance adjustments. These adjustments shall be provided by variable value components which are adjustable by the use of simple means. The calibration by substitution of sele

25、cted components or parts is unacceptable unless specifically approved. The calibration adjustments, wherever possible, shall be accessible without removal of the instrument case or modules. Calibration and Maintenance Adjustments. The design of the system shall provide for 3.25 ments specified in MI

26、L-T-28800. Interchangeability. The equipment shall meet the Type III interchangeability require- 3.26 28800. Digital Interface. The equipment shall meet the digital interface requirements per MIL-T- 3.27 Performance Characteristics. (a) Frequency Output. The equipment shall provide the following sin

27、usoidal output frequencies through separate connectors on the front and rear panels: 100 KHz; 1 MHz; 5 MHz and 10 MHz. This output shall be at least 1 volt rms into a 50 ohm load. (b) Frequency Stability. (1) Accuracy: The accuracy shall meet or exceed 1x1 0-1 1 at operating temperature range. (2) R

28、eproducibility: The reproducibility shall meet or exceed 5x1 0-12. (3) Settings: The setting error shall not exceed 7x10-13. (4) Long Term: The long term stability shall meet or exceed 5x10-12 for the whole tube life. (5) Short Term: The short term stability at 5 MHz shall have the following as an a

29、bsolute minimum acceptable specification: 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-So34 m 9999974 OLb5402 329 m A-A-58034 t (9 ff f lo- 5.610-“ 1 5.610-1 1 10 2.510-11 1 o2 810-l 103 2.5 1 O- 12 (6) Magnetic Field: At the 2 gauss DC magn

30、etic field, the frequency change shall not exceed 2x10-12. (7) Warm Up: The warm up time shall not exceed 45 minutes. (c) Distortion. (1) Harmonic: The harmonic distortion shall be down more than 40 dB below rated output. (2) Non-harmonic: The non-harmonic distortion shall be down 80 dB or more than

31、 rated output. (d) Single Side Band Phase Noise System. A signal with 1 Hz bandwidth shall have a signal-to-noise (SN) ratio with offset from carrier meeting the following as an absolute minimally acceptable level: J the charging time shall not exceed 16 hours. (b) Power Supply Cords. The Frequency

32、Standard shall be equipped with power cords which will allow the unit to be powered from the DC and AC sources. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-58039 = 999997Y 0365903 265 W A-A-58034 3.29 Calibration Interval. After calibration

33、, the equipment shall meet each performance requirement within the tolerances specified for a period of at least 9 months, based on an operating time of 1500 hours. 4. REGULATORY REOUIREMENTS, In accordance with section 23.403 of the Federal Acquisition Regulations, the Governments policy is to acqu

34、ire items composed of the highest percentage of recovered materials practicable, consistent with maintaining a satisfactory level of competition without adversely affecting performance requirements or exposing the suppliers employees to undue hazards from the recovered materials. 5. PACKAGING, The i

35、tems shall be packed in accordance with normal commercial practice and packed to assure acceptance by common carrier and provide product protection against loss and damage during multiple shipments, handling, and storage. The shipping shall be in compliance with national motor freight classification

36、 and uniform freight classification. Shipping container shall be marked as specified in the contract or order. 6. OUALITY ASSURANCE. Certification. The contractor shall certifj and maintain substantiating evidence that the product offered meets the salient characteristics of this CID, and that the p

37、roduct conforms to the producers own drawings, specifications, standards and quality assurance practices. The Government reserves the right to require proof of such conformance prior to first delivery, and thereafter, as may be otherwise provided for under the provisions of the contract. Small busin

38、esses that cannot offer products with established commercial market acceptability, may compete by submission of bid samples. (The Government reserves the rights to require proof of such conformance before first delivery and thereafter as may be otherwise provided for under the provisions of the cont

39、ract). 7. NOTES, Metrics P roducts. Products manufactured to metric dimensions will be considered on an equal basis with those manufactured using inch-pound units, provided they fall within specified tolerances using conversion tables contained in the latest revision of Federal Standard No. 376, and

40、 all other requirements of this Commercial Item Description are met. Federal and Military specifications are available from the Defense Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 191 1 1-5094. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without

41、 license from IHS-,-,-A- A-58034 Known AcceDtable Products. The following product is known to have previously met the Salient Characteristics of this CID and need not resubmit bid samples or certification. AI1 other manufacturers must meet the requirements of this CID and submit to bid testing and c

42、ertification. Manufacturer Model “SN Hewlett - Packard 5061A-003-E21 6625 -00-890-6493 Hewlett - Packard 5061B-003-E21 6625-01-3 18-5654 MILITARY INTERESTS: PREPARING ACTIVITY: Air Force - 82 Custodiari; Air Force - 99 Project Nos. 6625-0736 6625-0806 Reviewing Activites; Navy - AS Army - ER DLA - ES 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-