MIL-PRF-1/906E
TABLE I. Testing and inspection - Continued.
7/
The tube shall be rigidly mounted in axes X, Y, and Z by means of a clamp at the center of the cathode. The tube shall be given 10
blows in the X axis and 5 blows in each of the other test axes.
8/
The counting rate shall not vary by more than ± 0.3 N/t from the value of N/t of the calibrated beta source furnished with the
standard excitation unit.
9/
W ith the tube in a field giving 100 ± 10 Nps at 700 V dc, determine tube response (count rate) at 675, 700, and 725 V dc at each of
the following temperatures and in the order shown:
a.
Room temperature.
b.
-40°C.
c.
Room temperature.
d.
+75°C.
e.
Room temperature.
A minimum stabilization time of 30 minutes is to be allowed at each temperature. The absolute count rate of 700 V dc, and the
average relative plateau slope as determined by the readings at the 3 voltages (best average position of straight line), shall not
differ from the initial readings at room temperature by more than 10 percent, and ± 0.1 percent/volt, respectively, at any of the four
subsequent temperatures shown above.
10/
The limits for acceptability shall be as follows:
Photosensitivity: 35 Npm, maximum.
Background and contamination: Initial value + 20 Npm, maximum.
Starting voltage: Initial value ± 10 volts.
Plateau length: 150 volts, minimum.
Relative plateau slope: 0.25 percent/V dc, maximum.
End-of-plateau voltage: 760 volts, minimum.
Response (count rate) (1): Initial value ± 10 percent.
Pulse amplitude (1) and (2): Initial limits.
11/
The following tests shall be performed at the beginning and at the conclusion of the holding period: Photosensitivity, background,
and contamination, starting voltage, response (count rate) (1), and pulse amplitude (1) and (2), except that starting voltage shall not
vary more than 10 volts.
12/
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.
13/
Method B (test method 6216); the scaler of 5/ may be utilized for this test.
14/
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
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.
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III. The regular "12-calendar
month" sampling plan shall be reinstated after three consecutive samples have been accepted
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/
W ith 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.
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