MIL-PRF-1/988H
TABLE I. Testing and inspection - Continued.
1/
Criterion for passing the vibration test shall be compliance after test with initial requirements for voltage drop
and regulation.
Ebb shall be increased continuously until lb = 150 µA dc. The voltage drop shall not go below its value at
2/
lb = 55 µA dc.
3/
The tube under test shall not have been in conduction 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/
The tube shall be operated at the current specified for a period of at least 10 minutes prior to taking readings.
ĆEb maximum shall not be exceeded anywhere within the range 5 to 55 µA dc. In testing for regulation,
5/
current shall be varied continuously through the range of 5 to 55 µA dc.
ĆEb shall not exceed +4 V dc in going from room temperature (25°C ± 5°C) to +50°C. ĆEb shall not exceed
6/
the limits of 0 to -5 volts when going from room temperature to -20°C. Ionization voltage and regulation shall
remain within room temperature limits.
7/
The holding period commences upon completion of all production tests. At the conclusion of the holding
period, the specified tests shall be performed again. Of the tubes failing the holding period end-point test,
those which fail with respect to change in voltage drop only, may be retested after an additional 30-day
period. ĆEb(1) is the change in voltage drop from beginning to end of the holding period.
8/
This test shall be performed during the initial production and once each succeeding 12-calendar months in
which there is production. A sampling plan shall be used, with a sample of six 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.
The regular "12-calendar month" sampling plan shall be reinstated after three consecutive samples have
been accepted.
9/
This specification sheet uses an accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
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