MIL-PRF-1/1612C
TABLE I. Testing and inspection - Continued.
14/ This test shall be performed simultaneously with the Operation (1) test. An anode delay time measurement shall
be made at the end of 2 and 7 minutes of the Operation (1) test. The anode delay time drift measurement is the
numerical difference between the 2 minute and 7 minute anode delay time readings. The change in anode delay
time (with respect to the 2 minute reading) shall not exceed the value specified herein.
15/ The tube shall be tested by applying a peak forward anode voltage not to exceed that specified in the test
conditions for the time jitter test immediately after the cathode warm-up period (tk). The variation in firing time (tj)
shall not be greater than the amount specified herein after 120 seconds of operation.
16/ This test shall be conducted for a total of 5 consecutive hours with no more than 3 kickouts and with no evidence
of detrimental anode heating. The tube shall be started with Ef = Eres = 6.8 V ac and operate at this value for 4
hours. At the start of the 5th hour and while the tube is still operating, the filament voltage shall be lowered to Ef
= Eres = 5.8 V ac and remain there for the final hour of operation.
17/ The positive pulse shall be applied to the grid. The voltage between grid and cathode shall be measured not
more than 2.5 µs after the beginning of the current pulse. The average voltage shall not increase after the
voltage measurement point.
tp = 5.0 µs ± 10 percent; tr = 0.5 µs (max); prr = 60 pps ± 10 percent.
18/ Where production is less than 50 tubes per month, one tube shall be tested of each 50 produced. When one
month's production is more than 50 tubes but less than 250 tubes, the following sampling procedure shall be
used:
n1 = 2
c1 = 0
n2 = 2
c2 = 1
except that c1 = 1 if the first sample from the preceding lot contained no defectives.
19/ The shock test shall be performed in accordance with MIL-STD-202, method 213, test condition I. Each tube
shall be subjected to a total of 15 shock pulses; that is, five in each of axis X, Y, and Z in any sequence. A tube
which does not comply with the post shock limits shall be considered a failure.
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