MIL-PRF-1/1658C
TABLE I. Testing and inspection - Continued.
17/ The tube shall be capable of operating under the following conditions:
(a)
Apply cathode heater voltage and adjust reservoir voltage to 105 percent of the optimum value and allow both cathode and
reservoir to warm up for 15 minutes.
(b)
Raise anode voltage directly to the specified voltage at the rate of not less than 30 kv per minute.
(c)
The tube shall operate at the specified anode voltage for a total of 60 minutes which may include one interruption. A total of six
interruptions at any anode voltage is permitted provided that the total test time required to perform the operation test does not
exceed 120 minutes.
18/ No anode or grid voltage other than that required for an instantaneous start test shall have been applied to the tube for a minimum
period of 2 hours prior to this test.
19/ The optimum reservoir voltage shall be determined for each tube under these conditions, shall be inscribed permanently on the base
of each tube, and shall be within the limits specified for reservoir voltage (1).
20/ W ith the anode floating, the positive pulse shall be applied to the grid of the tube. Measure the voltage between grid and cathode not
more than 2.5 µs maximum after the beginning of the current pulse. The average voltage shall not rise during the last 4.0 µs. As an
alternate, the test may be conducted by connecting the grid to the anode through a 1-ohm resistance and reading epk. The limit for
this reading will be the same as that for egk in the emission test.
21/ This test shall be performed in the same circuit as operation (1A) test and within 60 seconds following the conclusion of the
operation (1A) test. The anode voltage shall be increased until the tube starts to conduct current. Ebb shall be below the specified
limit.
22/ The tube shall be capable of operating at 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 60 minutes which may include one interruption. A total of six
interruptions is permitted provided that the total test time required to perform the operation test does not exceed 120 minutes.
23/ During the interval between 2 and 60 minutes 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.
24/ The tj should be measured at 50 percent of the pulse amplitude and shall be not greater than the amount specified after 60 seconds
of operation.
25/ This specification sheet uses accept on zero defect sampling plan, in accordance with MIL-PRF-1, table III.
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