MIL-PRF-1/868F
5.
Vibrate in direction perpendicular to plane of grid.
6.
Frequency drift.
(a) Set for conditions of power oscillation (cw).
(b) Reduce Ef to 6.0 volts and allow frequency to stabilize. Record frequency.
(c) Raise Ef to 6.6 volts and allow frequency to stabilize. Record frequency.
(d) Reduce Ef to 6.0 volts and allow frequency to stabilize. Record frequency.
(e) Readings (b) and (d) shall not differ by more than 0.3 MHz. If a greater difference is found, repeat
(a) through (c) inclusive.
(f) Frequency drift is equal to the difference between the frequency recorded at (b) and (c), or (c) and
(d), whichever is greater.
(g) During the frequency drift test, there shall be no evidence of abrupt change in the power output
meter. If such a change does occur, the oscillator shall be returned for a more stable operation.
7.
This test shall be performed yearly. 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,
acceptance level 6.5 (see 8/). The yearly sampling plan may be reinstated after three consecutive sampling 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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