MIL-PRF-1/924H
(e)
Record referenced characteristic measurements after a maximum operation of 15 minutes under
specified voltage and current conditions on the entire sample.
(f)
The life-test sample shall be read at the following times:
100 hours (+50, -10)
300 hours (+48, -24)
500 hours (+48, -24)
1,000 hours (+48, -24)
Additional reading periods may be used at the discretion of the electron tube manufacturer.
Tubes which fail to meet the acceptance criteria at 100 hours may not be continued further on life
test.
Acceptance. The lot shall be considered satisfactory for acceptance provided that there are no defectives.
(g)
(h)
A resubmitted lot shall be subjected to all conformance inspection, part 1 tests, except
visual and mechanical inspection criteria, vibration, and barometric pressure, reduced.
(i)
Not more than one accidental breakage shall be allowed in the life-test sample. If one life-test
tube is accidentally broken, acceptability of the life-test sample shall be based upon the remaining tube in the
sample, provided that the broken tube was not known to be defective.
15. A separate SLO-BLO fuse that blows at 1.3 amperes shall be used in each anode circuit. A tube which blows fuses more
frequently than once during the 500-hour life test, or twice during the 1,000-hour life test, shall be considered a life-test
defect.
16. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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