1、 MIL-PRF-1/781F 29 May 2013 SUPERSEDING MIL-PRF-1/781E 1 May 2007 PERFORMANCE SPECIFICATION SHEET ELECTRON TUBE, THYRATRON TYPE 6D4 This specification is approved for use by all Departments and Agencies of the Department of Defense. The requirement for acquiring the electron tube described herein sh
2、all consist of this specification and MIL-PRF-1. DESCRIPTION: Triode, noise generator. Mounting position: Any. Weight: 0.3 ounce (8.5 grams) nominal. Base: E7-1 (EIA). Envelope: T5-1/2 (5-2). Pin connections: Pin no.: - - - 1 2 3 4 5 6 7 Element: - - - g nc h h k nc a ABSOLUTE RATINGS: Parameter: Ef
3、 Ebb epx epv Ib ib tk Ec1 Unit: V V dc v v mA dc a sec V dc Maximum: 6.93 250 350 350 25 0.110 - -150 Minimum: 5.67 - - - - - 30 - Test conditions: 6.3 125 - - - - - - ABSOLUTE RATINGS: Parameter: Rhk Rg Rp Rk Ehk Du TA Unit: Meg Meg Ohms Ohms V % C Maximum: - - - - -110 0.75 +90 Minimum: - - - - -
4、 -55 Test conditions: 1.0 0.5 650 4,000 - - - _ GENERAL: Qualification - Not required. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III. AMSC N/A FSC 5960 INCH-POUND INACTIVE FOR NEW DESIGN AFTER 30 APRIL 1997. Provided by IHSNot for ResaleNo repr
5、oduction or networking permitted without license from IHS-,-,-MIL-PRF-1/781F 2 TABLE I. Requirements or tests. Requirement or test MIL-STD-1311 method Notes Conditions Symbol Limits Unit Min Max Conformance inspection, part 1 Grid-cathode voltage Heater current Critical grid voltage for conduction (
6、1) Voltage drop - - - 3241 3201 3204 1 - - - 4 - - - Ec = -20 V dc; Rhk = 0 Rb/Ib = 100 mA dc Egk If Ec Etd - - - 230 -11.0 - - - 2.0 270 -14.0 18 V dc mA V dc V dc Conformance inspection, part 2 Heater-cathode leakage Critical grid voltage for conduction (2) Critical grid voltage for conduction (3)
7、 Noise output (1) Noise output (2) 1336 3201 3201 - - - - - - - - - - - - - - 2 3 Ehk = -100 V dc Ebb = 50 V dc Ebb = 300 V dc Ebb = 300 V dc; Rg = 0; Rp = 56,000 ohms Ebb = 250 V dc; Rg = Rk = 0; Rp = 0.33 Meg Ihk Ec Ec - - - Output - -5.0 -21 - - - 10 15 -7.0 -31 - - - - - - A dc V dc V dc - - - v
8、 Conformance inspection, part 3 Life test Life-test end points: Critical grid voltage for conduction (1) Noise output (2) Low-frequency vibration - - - - - - 3201 - - - 1031 - - - - - - 3 5 Group A; Ebb = 250 V dc; Ec = -20 V dc; Rp = 5,000 ohms; Rhk = disconnected; Ehk = 110 V; t = 500 hours No vol
9、tages applied - - - Ec Output - - - - - - -9.5 9.0 - - - - - - -15.5 - - - - - - - - - V dc v - - - See footnotes at top of next page. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/781F 3 TABLE I. Requirements or tests - Continued. NOTES:
10、 1. Voltage measured across specified grid resistor. 2. The tube shall be placed in the circuit shown (see figure 1) in a constant magnetic field of 375 10 percent gausses perpendicular to the normal electron path. The direction of the magnetic field shall be such as to deflect the electron beam tow
11、ard the top of the tube (north pole of magnet at pin No. 7). The noise voltage measured at the output of the 1,000 Hz bandwidth filter shall not be less than the limits specified below for the various specified frequencies: Frequency, MHz Minimum noise voltage, V rms 0.1 0.2 0.5 1.0 2.0 5.0 10.0 10,
12、000 14,000 25,000 22,000 7,000 500 70 3. The tube shall be placed in the circuit shown (see figure 2) in a constant magnetic field of 375 20 percent gausses which is perpendicular to the normal electron path. The direction of the magnetic field shall be such as to deflect the electron beam toward th
13、e top of the tube. The noise voltage measured at the anode of the tube and across the output of the circuit shall not be less than the specified limit in peak-to-peak volts. The oscilloscope used for noise amplitude measurement shall have a 3 dB video bandwidth extending to at least 4 MHz. 4. This t
14、est shall be the first test performed at the conclusion of the holding period. 5. This test shall be performed according to the life testing schedule given in MIL-PRF-1 paragraph 4.3.8. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/781F 4
15、 FIGURE 1. Noise voltage test circuit. FIGURE 2. Noise voltage test circuit. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-1/781F 5 Referenced documents. In addition to MIL-PRF-1, this document references MIL-STD-1311. The margins of this s
16、pecification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements
17、of this document based on the entire content irrespective of the marginal notations and relationship to the last previous issue. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 85 (Project 5960-2013-011) DLA - CC Review activities: Army - AR Navy - AS, CG, MC, OS, SH Air For
18、ce - 99 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.dla.mil/. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
