MIL-PRF-1/1049H
TABLE I. Testing and inspection - Continued.
18/ The background shading shall be uniformly graded so that there is no line of demarcation between light and dark areas. Two tests
shall be performed.
a. W ith no radiation incident on the photocathode.
b. W ith the radiation uniformly distributed over the photocathode produced by filtering through Corning filter No. 2540,
0.1 to 0.4 lumens/square foot from a tungsten source operating at a color temperature of 2,854°K.
19/ The tubes shall be rigidly mounted, singly or in groups, in a vertical position with the cathode end up, and subjected to a simple
harmonic motion having an amplitude of not less than .063 inch (1.59 mm) (total excursion .125 (3.18 mm)), at a frequency of 30
Hz, for a period of 2.5 minutes. No voltage potential shall be applied to the tube during the above vibration test. Any tube submitted
for qualification shall be tested only once, after which a certification that the vibration test has been performed shall be issued.
20/ The tubes shall be rigidly mounted, singly or in groups, in a vertical position with the cathode end up, and subjected to a simple
harmonic motion having an amplitude of not less than 0.040 ± 0.0025 inch (1.02 ± 0.064 mm) (total excursion 0.080 ± 0.005 inch
(2.03 ± 0.13 mm)) at a frequency of 50 ± 2 Hz, for a period of 2 minutes. No voltage potential shall be applied to the tube during the
above vibration test.
21/ The tube shall be placed in a test chamber and internal temperature of the chamber raised gradually to 68°C. After not less than
1-hour at 68°C, the chamber temperature shall be lowered to 52°C and held for at least 1-hour. At the end of this period, the tube
shall be removed immediately to room temperature (approximately 22°C) and shall remain at this temperature for not less than
1-hour. At the end of this period, the tube shall be replaced in the test chamber and the internal temperature of the chamber lowered
gradually to minus 54°C. After not less than 1-hour at minus 54°C, the chamber shall be raised to minus 32°C and held for not less
than 1-hour. At the end of this period, the tube shall be removed immediately to room temperature (approximately 22°C). Evidence
of deformation, cracks, or breakage shall constitute failure of this test.
22/ The following post environmental tests shall be performed and shall meet test limits specified in conformance inspection, part 1:
conversion index, conversion index to background, alignment and image shift, center resolution, cathode and screen spots,
breakdown, dark current, and threshold sensitivity.
23/ This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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