MIL-PRF-1/505H
TABLE 1. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Acceptance
Symbol
Limits
Limits
Units
MIL-STD-
Level
Min
Max
1311
(see note 8)
Conformance inspection,
part 3
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Life test
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Group B; Ebb/IB = 55
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± 5 µA dc
t = 500 hours
Life-test end points:
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V dc
715
685
Eb(1)
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Voltage drop
3337
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V dc
15
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Regulation
3335
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ĆEb
V dc
730
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Ionization voltage
3347
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Ez
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Peak current
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1041
Shock
2, 7
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300 G
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1002
7
Barometric pressure,
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Pressure = 55 mmHg;
reduced
Eb = 750 V dc
NOTES:
1. Criterion for passing this test shall be compliance after test with the initial requirements for voltage drop and regulation.
2. Electrical samples shall not be used for this test. Ten additional samples shall be submitted for shock test only. Criterion for
passing this test shall be compliance after test of at least 80 percent of the tubes with the initial requirements for voltage drop
and regulation.
3. The tube under test shall not have been conducting for at least 30 minutes prior to test. During this test, the regulator tube shall
not be exposed to external sources of radiation and shall be shielded from light. No conditioning current is permitted.
4. ĆEb maximum shall not be exceeded anywhere within the range 5 to 55 µA dc. In testing for regulation, current shall be varied
continuously through the range of 5 to 55 µA dc.
5. Ebb shall be increased continuously until Ib = 200 µA dc. The voltage drop shall not go below its value at Ib = 55 µA dc.
6. The holding period commences upon completion of the initial performance of the specified tests. At the conclusion of the
holding period, the specified tests will be performed again. Of the tubes failing the holding period end-point tests, those which
fail with respect to voltage drop only, may be retested after an additional 30-day period. Eb(1) is the voltage drop measured at
the beginning of a holding period.
7. This test shall be performed during the initial production and once each succeeding 12-calendar months in which there is
production. An accept on zero defect sampling plan shall be used, with sample of three tubes with an acceptance number of
zero. In the event of failure, the test will be made as a part of conformance inspection, part 2, with an acceptance level of 6.5 (see
note 8). The "12-calendar month" sampling plan shall be reinstated after three consecutive samples have been accepted.
8. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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