MIL-PRF-1/1428G
TABLE I. Testing and inspection - continued.
1/ Instantaneous starting permissible. The maximum permissible epy is 8.0 kv and shall not be attained in less than 0.04 seconds.
2/ In pulsed operation, the peak inverse voltage, exclusive of a spike of 0.05 µs maximum duration, shall not exceed 2.5 kv during the
first 25 µs following the anode pulse.
3/ The driver pulse, measured at the tube socket with the thyratron grid disconnected shall have the following characteristics:
egy = 175 v (min), tr = 0.25 µs (max); grid pulse duration tp = 1.0 µs (min). Impedance of drive circuit = 1,200 ohms (max).
4/ Forced-air cooling directed on the anode or envelope is permissible, depending upon operating conditions.
5/ The circuit constants shall be chosen under resonant charging conditions so that epy = 8.0 kv; ib = 90 a (min); dik/dt = 1,000 a/µs
(min); tp = 0.12 ± 0.012 µs; prr = 4,000 (min). Grid pulse as measured at tube socket with thyratron grid disconnected shall have
the following characteristics: tr = 0.25 µs (max), tp = 1.0 µs (max), internal impedance of driver: 1,200 ohms (min).
6/ The tube shall operate satisfactorily on push button starting within three attempts when the anode voltage (epy) is applied to the tube
under test in such a manner as to rise from 0 to 8.0 kv minimum within 0.03 second. Any tube failing to start within three attempts
shall be considered a failure.
7/ The voltage between grid and cathode shall be measured not more than 2.5 µs after the beginning of the current pulse.
8/ During the interval between 30 and 90 seconds of the anode delay time test, the (Ćtad) relative to the tad value observed on the
anode delay time test shall not exceed the specified value.
9/ During every 50 ± 8 hour period, the life test shall be shut off for 60 minutes (min) and then tested for life-test end points.
10/ There shall be no pronounced resonance in the range specified in MIL-STD-1311, method 1031.
11/ The tube shall operate satisfactorily at the ambient temperature specified herein at operation test conditions for a total of
5 consecutive hours. This test shall be performed on a minimum of four tubes on an annual basis.
12/ 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 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 part of conformance inspection, part 2, with an acceptance level of 6.5 (see 13/). The
"12-calendar month" sampling plan shall be reinstated after three consecutive samples have been accepted.
13/ This specification sheet uses accept on zero sampling in accordance with MIL-PRF-1, table III.
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