MIL-PRF-1/1325F
TABLE I. Testing and inspection - Continued.
9/
The no-load to steady-state full load of the heater voltage supply shall be not more than 3 percent. A failure or defect shall consist
of an open heater, open cathode circuit, heater cathode short, or heater cathode leakage in excess of the specified heater cycling
life-test end-point limit.
10/
Test shall be performed in amplifier cavity Amerac Model No. 1244-1, or equivalent. Test frequency shall be 550 to ± 10 MHz.
Adjust Rk for Ik = 25 mA dc and Rg for Ig = 6 mA dc.
11/
Cycle Ef only, 110 minutes "on", 10 minutes "off".
12/
Test shall be performed on a group D basis every 90 days with the lot consisting of the current month and two subsequent months.
Failure of any tube shall revert back to group D monthly lot sampling. After three consecutive successful lot submissions have
been completed, the test may revert to the quarterly basis.
13/
Test shall be performed in accordance with MIL-STD-1311 method 1521 and MIL-PRF-1 every 90 days. Failure of any tube shall
revert back to MIL-PRF-1 monthly lot sampling. After three consecutive successful submissions have been completed, the test
shall revert to the quarterly basis.
14/
A complete cycle is made in a 6 minute period as follows: 3 minutes on, 3 minutes off. This is a destructive test. Mechanical or
electrical rejects may be used.
15/
Tubes meeting the initial test requirements after stability and survival-rate life tests shall be accepted under this specification.
16/
Subject tubes to shock in axes X, Y, and Z for a total of 15 blows, five blows in each axis.
17/
Vibrate in axes X and Y only for a total of 64 hours, 32 hours in each axis.
18/
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 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, with an acceptance level of 6.5 (see 20/).
The regular "12-calendar month" sampling plan shall be reinstated after three consecutive samples have been accepted.
19/
Use basic test method 2126 (for receiving tubes) for seal strain test of this ceramic tube type.
20/
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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