MIL-O-81151A(OS)
4.5.3.1 High temperature and humidity, nonoperating. The oscilla-
tor subassembly shall be subjected to the "High temperature and humidity,
nonoperating" test of MIL-E-82590 and thereafter shall meet the require-
ments of 3.5.3.1.
4.5.3.2 High temperature, operating. The oscillator subassembly shall
be subjected to the "High temperature, operating" test of MIL-E-82590 and,
while at the test temperature, shall meet the requirements of 3,5.3.2.
4.5.3.3 Low temperature, nonoperating, The oscillator assembly shall
be subjected to the "Low temperature, nonoperating" test of MIL-E-82590
and thereafter shall meet the requirements of 3.5.3.3.
4.5.3.4 Low temperature, operating, The oscillator subassembly shall
be subjected to the "Low temperature, operating" test of MIL-E-82590 and,
while at the test temperature, shall meet the requirements of 3.5.3.4.
4.5.4 Immersion. The oscillator shall show no evidence of leakage
while being subjected to the immersion test specified in MIL-STD-202,
Method 104, condition A, and thereafter shall meet the performance and
product requirements of this specification.
4.5.5 Operating life. The operating life of the oscillator subassembly
shall be tested as follows:
4.5.5.1 Connect the oscillator subassembly as shown in Figure 1. Apply
heater power to the vacuum tube and allow it to warm-up for at least 30
seconds. Apply 150 plus or minus 1 vdc as shown in Figure 1 and allow
the circuit to operate for 30 plus or minus 1 minutes. Then remove the
150 vdc and allow the circuit to rest for at least 1 hour. This shall be
considered one cycle of operation.
4.5.5.2 Repeat 4.5,5.1 until 800 cycles of operation have been completed,
after which the oscillator subassembly shall meet all the requirements of
3.4.1 through 3.4.7.
4.5.5.3 The vacuum tube and test circuit components may be replaced
as necessary to permit continuance of this test.
4.0 Waiver of tests. Tests specified in 4.5.1.4 and 4.5.2 shove may
be waived by the procuring agency for Level C packs only, provided the
contractor guarantees safe delivery to the using activity.
4.7 Functional tests. At the conclusion of the tests specified in
4.5.1.4 and 4.5.2 above, functional and other tests, as applicable, shall
be conducted on the oscillator subassembly to determine freedom from
operational malfunction and compliance with all performance requirements
and product characteristics 01 this specification.
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