MIL-PRF-1/484E
TABLE I. Testing and inspection- Continued.
Limits
MIL-STD-
Requirement or test
Notes
Conditions
Acceptance Symbol
Unit
1311
level
Min
Max
method
Conformance inspection, part 3
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Life test
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Group B;
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Eb = 200 V dc;
Rk/Ib = 10 mA dc;
t = 1,000 hours
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Life-test end points:
ĆSm
Transconductance
1306
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25
%de-
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crease
t
ĆNF
Noise figure (1)
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1.0
dB in-
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crease
t
Low-frequency vibration
1031
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4
Ec = 0;
100
mVac
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Ep
Eb/Ib = 10 mA dc;
Rp = 10,000 ohms;
Drawing 273-JAN
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Shock
1041
5
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No voltages; hammer
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Angle=20°;
Drawing 274-JAN
Shock-test end points:
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Sm
Transconductance
1306
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11,500
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µmhos
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MegΩ
Rgp
Insulation of electrodes
1211
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5.0
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MegΩ
Rgk
Insulation of electrodes
1211
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0.25
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NOTES:
1.
The 60 Hz voltages eb and ec shall be in phase, and the sinusoidal waveform should not be distorted. Read average
cathode current.
2.
An approved noise source shall be used for noise figure measurements. Power input level shall be about -75 dBm for power
gain (1), noise figure (1), power gain (2), and noise figure (2).
3.
Envelope strain procedure. Tubes shall be tested as specified in MIL-STD-1311 method 2126, except that they shall first be
immersed in water at not more than 5°C for 15 seconds, and immediately thereafter subjected to the standard temperature
cycle specified in method 2126. The criteria for air leaks shall be heater current of 330 mA, or more.
4.
Vibrate in plane perpendicular to the plane of the grid. Test 10 tubes selected at random from the first production lot of each
calendar year, and approximately every 90 days of production during the year. If one tube fails to pass the specified end
points, the test shall become a part of conformance inspection, part 2, acceptance level of 6.5 (see note 6). After three
consecutive successful submissions, the test shall revert back to the 10-tube quarterly test.
5.
Apply the force perpendicular to the plane of the grid from the cathode end. Test 10 tubes selected at random from the first
production lot of each calendar year. If one tube fails to pass the specified endpoints, the test shall become a part of
conformance inspection, part 2, acceptance level of 6.5 (see note 6), on all lots in process. After three consecutive
successful submissions, the test shall revert back to a 10-tube annual test.
6.
This specification utilizes an accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
7.
Drawings 270-JAN, 271-JAN, 272-JAN, 273-JAN and 274-JAN are referenced herein. Contact the preparing activity for
availability information, if required."
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