MIL-PRF-1/1404E
TABLE I. Testing and inspection - Continued.
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The time, from the application of the filament voltage until the anode current attains the minimum value specified, shall be within the
time limit specified. (A relay is switched into the anode circuit, which stops the timer when the anode current reaches
predetermined value. The timer starts with application of filament voltage.)
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This is essentially a sweep-frequency vibration test. The tube under test shall be mounted on a vibration table vibrating at simple
harmonic motion. Low-frequency (25 Hz) vibration test conditions shall be applied, and Ep monitored while the frequency of
vibration is continuously swept from 50 to 5,000 Hz and back, with the peak acceleration controlled constant at 2 G. Total time for
each sweep cycle shall be not less than 1 minute.
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This test shall be conducted on the initial lot submitted under a contract or order, and shall be conducted again after 12 months of
continued production under a contract or order.
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Acceptance shall be based upon the following double sampling plan with an accept on zero defect criteria consistent with
MIL-PRF-1.
Double sampling plan.
Cumulative
Cumulative
Sample size
sample size
Acceptance Number
1st sample - - - - -
10
10
zero
2nd sample- - - - -
20
30
one
In the event of failure, the test shall be made as a part of conformance inspection, part 2, acceptance level 0.65, inspection level II.
The regular double sampling plan may be reinstated after three consecutive samples have been accepted.
Eligibility for reduced-hours life test shall be consistent with MIL-STD-1311, method 1501 criteria. Larger life-test samples may be
selected from initial life-test lots in accordance with the following:
a.
The number of tubes from any lot shall not exceed 20.
b.
In those instances where more than 10 tubes are selected, the tubes shall be subsequently numbered and the first 10
tubes shall be considered the first sample for evaluation of the lot they represent.
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First article inspection shall consist of performing all tests listed on this TSS. The sample size and allowable defects shall be in
accordance with MIL-PRF-1, Qualification, Samples and Acceptance Criteria. Three copies of the test report shall be forwarded to
the purchasing activity.
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This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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