1、 MIL-PRF-1/988H 16 December 2002 SUPERSEDING MIL-PRF-1/988G 27 August 1999 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, VOLTAGE REGULATOR TYPE 7615 This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements for acquiring the electron tub
2、e described herein shall consist of this specification and MIL-PRF-1. DESCRIPTION: Corona discharge. Dimensions: See figure 1. Mounting position: Any. Weight: 0.23 ounces (6.5 grams) nominal. ABSOLUTE RATINGS: Parameter: Ez Eb lb TA Unit: V dc V dc A dc C Maximum: Minimum: 730 - 690 670 55 5 +50 -20
3、 Test conditions: - - - - _ GENERAL: Qualification: Not required. AMSC N/A 1 of 5 FSC 5960 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/988H 2 T
4、ABLE I. Testing and inspection. Limits Inspection Method Notes Conditions Acceptance level 9/ Symbol Min Max Unit Conformance inspection, part 1 Ionization voltage (total darkness) Voltage drop Regulation Peak current Holding period end points: Ionization voltage Change in voltage drop Regulation Sh
5、ort and discontinuity detection 3347 3337 3335 - - 3347 - 3335 1201 3/ 4/ 4/ 5/ 2/ 3/ 7/ 4/ 7/ 4/ 7/ - Ebb/Ib = 20 A dc lb = 5 to 55 A dc Ebb/Ib = 150 A dc 0.65 0.65 0.65 0.65 0.65 0.65 0.65 0.4 Ez Eb Eb - Ez Eb(1) Eb - - 670 - - - - - - 730 685 4 - 730 3 4 - V dc V dc V dc - V dc V dc V dc - Confor
6、mance inspection, part 2 Leakage current Temperature range, operating 3305 1026 - 6/ Eb = 500 V dc; T = 25C 5C; relative humidity = 90 5 percent T = -20C to +50C; lb = 20 A dc Lib - - - 0.5 - A dc - Conformance inspection, part 3 Life test Life-test end points: Ionization voltage Voltage drop Regula
7、tion Shock Low-frequency vibration - - 3347 3337 3335 1041 1031 - 3/ 4/ 4/ 8/ 1/ 8/ Group A; EBB/lb = 20 2.5 A dc; t = 500 hours Hammer angle = 20No voltages applied; F = 25 Hz - Ez Eb Eb - - - - 670 - - - - 730 690 5 - - - V dc V dc V dc - - See footnotes at top of next page. Provided by IHSNot for
8、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/988H 3 TABLE I. Testing and inspection - Continued. 1/ Criterion for passing the vibration test shall be compliance after test with initial requirements for voltage drop and regulation. 2/ Ebb shall be increased co
9、ntinuously until lb = 150 A dc. The voltage drop shall not go below its value at lb = 55 A dc. 3/ The tube under test shall not have been in conduction for at least 30 minutes prior to test. During this test, the regulator tube shall not be exposed to external sources of radiation and shall be shiel
10、ded from light. No conditioning current is permitted. 4/ The tube shall be operated at the current specified for a period of at least 10 minutes prior to taking readings. 5/ Eb maximum shall not be exceeded anywhere within the range 5 to 55 A dc. In testing for regulation, current shall be varied co
11、ntinuously through the range of 5 to 55 A dc. 6/ Eb shall not exceed +4 V dc in going from room temperature (25C 5C) to +50C. Eb shall not exceed the limits of 0 to -5 volts when going from room temperature to -20C. Ionization voltage and regulation shall remain within room temperature limits. 7/ Th
12、e holding period commences upon completion of all production tests. At the conclusion of the holding period, the specified tests shall be performed again. Of the tubes failing the holding period end-point test, those which fail with respect to change in voltage drop only, may be retested after an ad
13、ditional 30-day period. Eb(1) is the change in voltage drop from beginning to end of the holding period. 8/ This test shall be performed during the initial production and once each succeeding 12-calendar months in which there is production. A sampling plan shall be used, with a sample of six tubes w
14、ith an acceptance number of zero. In the event of failure, the test will be made as a part of conformance inspection, part 2. The regular “12-calendar month“ sampling plan shall be reinstated after three consecutive samples have been accepted. 9/ This specification sheet uses an accept on zero defec
15、t sampling plan in accordance with MIL-PRF-1, table III. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/988H 4 NOTE: Mechanical configuration and materials used may vary, provided all specified dimensions are met. FIGURE 1. Outline drawing
16、 of electron tube type 7615. Dimensions Inches Millimeters Ltr Min Max Min Max Conformance inspection, part 2 A - .395 - 10.03 B 2.125 2.250 53.98 57.15 C 1.625 1.750 41.28 44.45 Reference dimensions D .250 6.35 E .250 6.35 F .250 6.35 Provided by IHSNot for ResaleNo reproduction or networking permi
17、tted without license from IHS-,-,-MIL-PRF-1/988H 5 Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 11 (Project 5960-3616) DLA - CC Review activities: Army - AR Navy - AS, CG, MC, OS Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
