MIL-PRF-1/868F
TABLE I. Testing and Inspection Continued
Limits
Method
Acceptance
Inspection
Conditions
Symbol
Unit
MIL-STD-
level
Min
Max
1311
note 8
Conformance inspection,
part 3
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Life-test (1)
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Group A
Eb = 300 Vdc;
Rk/Ib = 17 mAdc;
t = 500 hours
Life-test (1) end point:
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Power oscillation (cw)
1236
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Po
25
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mW
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Life-test (2)
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Group C;
power oscillation
(pulsed) except
prr = 2,000 ±10%
t = 500 hours
Life-test (2)
Life-test (2) end point
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Po
300
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mW
conditions
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Ep
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100
mV
High-frequency vibration
1031
F = 50 Hz; 10G;
Ebb = 300 V dc;
Rp = 10,000 ohms;
Ec/Ib = 10 mA dc
Notes 4, 5 and 7
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20
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lb-in
Secureness of base,
1101
No voltages;
cap, or insert
torque to be
applied between
anode and pins
without shock
Notes 4 and 7
Torque-test end point
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Total grid current
1266
Note 7
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Ic
---
-0.5
A dc
Frequency draft
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Notes 4, 6 and 7
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F
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2.0
MHz
NOTES:
1.
The following test methods shall not apply: MIL-STD-1311 Methods 1006 and 1201.
2.
The pulse shape shall be in accordance with method 1296. Minimum power output limit, based on a duty factor of 0.001,
may be adjusted for the exact duty factor used. Coupling and tuning to be adjusted for maximum power output. The tube
shall operate under the given conditions and minimum output, or greater, for a minimum of 30 seconds without arcing or
instability as evidenced by pronounced variations in the average anode current meter or the power output meter. If
temporary arcing does occur during the 30-second period, the tube must subsequently operate for 60 seconds without
arcing. The test may be discontinued, at the end of the 30-second period, if the power output has not completely stabilized
but is rising. If the power output is falling, the test is continued until a stable reading is obtained. For qualification approval,
a stable reading shall be obtained.
3.
The starting voltage is measured by raising the pulsed anode voltage from zero and noting the voltage at which a readable
indication is obtained on the power meter. The tube may not be oscillating during the full width of the modulation pulse
during this test.
4.
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 point, the failed test shall become a part of
conformance inspection, part 2, on all lots in process. After three consecutive successful submissions, the test shall revert
to the 10-tube quarterly test.
3
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