MIL-PRF-1/986J
TABLE I. Testing and inspection - Continued.
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The tube shall be placed in a radiation field that will produce a counting rate of 1,000 ± 50 Nps when it is
activated with a voltage pulse that has a maximum width of 50 µs, a nominal height of 150 volts and a prr of
1,400 ± 200.
10/
The limits of acceptability shall be as follows:
a. Background, contamination, and photosensitivity: Initial limits specified herein.
b. Starting voltage: 695 volts minimum.
c. Anode voltage for 50 volt pulse: Initial value -15, +5 volts.
11/
The tube shall be mounted with its longitudinal axis horizontal and perpendicular to the direction of motion
by means of a rigid clamp at the center of the cathode. The time for gradually covering the frequency
range shall be 15 minutes.
12/
The functional requirements of the tube over the stipulated range of temperature conditions shall be as
follows:
a. Background, contamination, and photosensitivity: Initial limits specified herein.
b. Starting voltage: Initial limits specified herein.
c. Pulse amplitude: Initial value ± 6 volts at +50°C, ± 12 volts at -20°C.
13/
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 defects. 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. The regular "12-calendar month" sampling plan shall be reinstated after three
consecutive samples have been accepted.
14/
This specification sheet utilizes an accept on zero defects sampling plan in accordance with MIL-PRF-1,
table III.
15/
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.
16/
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
250 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.
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