MIL-PRF-1/973E
TABLE I. Testing and inspection - Continued.
e.
End-of-plateau voltage: 750 volts, minimum.
f.
Response count rate (gamma): Initial value ± 10 percent.
g.
Pulse amplitude (1) and (2): Initial limits.
10/
This test to be performed at the conclusion of the holding period.
11/
The tube shall be mounted with its longitudinal axis horizontal and perpendicular to the direction of motion
by means of a rigid lamp at the center of the cathode. The time for gradually covering the frequency range
shall be 15 minutes.
12 /
Method B (test method 6216); the scaler of note 5 may be utilized for this test.
13/
The tube shall be rigidly mounted in positions X and Z by means of a clamp at the center of the cathode.
The tube shall be given 10 blows at the X position and 5 at the Z position.
14/
This test shall be performed during the initial production and once each succeeding 12-calendar months in
which there is production. A sampling plan shall be used, with six 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 15/). The regular "12-calendar month" sampling plan shall be reinstated after
three consecutive samples have been accepted.
15/
This specification sheet utilizes an accept on zero (c = 0) sampling plan in accordance with MIL-PRF-1,
table III.
16/
The manufacturer, with the approval of the qualifying activity, may perform this test on a periodic basis,
versus performing the test on every lot. Approval will be based on demonstrating to the qualifying activity
the capability of the design to meet this requirement. If the design, material construction or processing of
the tube is changed or if there are any quality problems, the qualifying activity may require resumption of
the original testing frequency. This allowance does not relieve the manufacturer from meeting the test
requirements in case of dispute.
17/
With qualifying activity approval the manufacturer may provide, in accordance with MIL-PRF-1, service-
life guarantee, in lieu of performing life testing. Life test endpoints specified shall apply to service-life
guarantee conformance as well as to life test conformance. The number of hours of system-deployed,
accumulated tube-operating time shall be approved by the qualifying activity and shall be a minimum of
500 hours. Service-life guarantee shall define tube operating life and not time from purchase or delivery.
Tubes sold under service-life guarantee shall be marked with contract number and with the number of
tube operating hours guaranteed.
5
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