MIL-PRF-1/1658C
TABLE I. Testing and inspection - Continued.
10/ The anode circuit constants shall be chosen so that at epy = 33.0 kv under resonant charging conditions; ib = 2,000 amps minimum;
dik/dt shall be 10,000 amps/µs minimum; tp = 2.5 µs ± 1 0 percent; prr = 500 pps minimum. The tube shall be tested in the test
circuit shown on figure 4.
W arning:
These conditions are specified only for the purpose of determining circuit constants. The actual operating voltage
and repetition rates for each test are specified in the conventional manner under the particular conditions or under
the general test conditions. Tests performed at repetition rates less than the resonant charging rate shall be made
with a hold-off diode in the charging circuit.
Grid pulse measured at tube socket with thyratron grid disconnect: tr = 0.35 µs minimum; tp = 2.0 µs maximum; internal impedance
of driver: 75 ohms minimum.
11/ There shall be no evidence of deleterious anode heating during the test.
12/ The tube shall be capable of operating under the following conditions:
(a)
Apply cathode heater voltage and adjust reservoir voltage to 95 percent of the optimum reservoir voltage and allow both to
warm up for 15 minutes.
(b)
Raise anode voltage directly to the specified voltage at a rate of not less than 30 kv per minute.
(c)
The tube shall operate at the specified anode voltage for a total of 2 hours which may include one interruption. A total of four
interruptions at any anode voltage is permitted provided that the total test time required to perform this part of the operation
test does not exceed 135 minutes.
(d)
After the above operation at full anode voltage, increase the reservoir voltage to 105 percent of the optimum value. The tube
shall continue to operate for an additional 2 hours with not more than one interruptions.
(e)
After the above operation at full anode voltage, decrease the reservoir voltage to optimum value. The tube shall continue to
operate for an additional hour without interruption.
13/ The anode circuit constants shall be chosen so that at epy = 25.0 kv under resonant charging conditions; ib = 1,000 minimum; rate
of rise of dik/dt shall be 5,000 amps/µs minimum; tp = 5.0 µs ± 10 percent; prr = 500 minimum. The tube shall be tested in the test
circuit shown on figure 4.
W arning:
These conditions are specified only for the purpose of determining circuit constants. The actual operating voltage
and repetition rates for each test are specified in the conventional manner under the particular conditions or under
the general test conditions. Tests performed at repetition rates less than the resonant charging rate shall be made
with a hold-off diode in the charging circuit.
Grid pulse measured at tube socket with thyratron grid disconnected: tr = 0.35 µs minimum; tp = 2.0 µs maximum; internal
impedance of driver: 75 ohms minimum.
14/ During every 96-hour period, the life test shall be shut off for a minimum of 30 minutes.
15/ This test shall be performed in the same circuit as operation (1) test and within 60 seconds following the conclusion of the operation
(1) test. The anode voltage shall be increased until the tube starts to conduct current. Ebb shall be below the specified limit.
16/ This test shall be the first test performed after the holding period. The tube shall operate satisfactorily on pushbutton starting within
three attempts when the epy is applied to the tube under test in such a manner as to rise from 0 to 24 kv minimum within 0.04
second. (The filter in the rectifier shall be designed so that the epy reaches at least 9.0 kv within 0.015 second.) The intervals
between successive attempts to instantaneously start the tube shall be not less than 10 or more than 30 seconds. Any tube failing
to start within three attempts will be considered a failure.
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