MIL-PRF-1/275E
TABLE I. Testing and inspection - Continued.
NOTES:
1.
The deflection plates shall be returned to No. 2 anode through a minimum of 2.5 MΩ resistors. The light output shall be set
at 2 fL. The high-frequency scanning shall be applied to the deflecting plates nearest the screen and the amplitude shall be
adjusted to give a line length of approximately 90 percent of the maximum tube diameter. The low-frequency scanning
amplitude shall be expanded to approximately 90 percent of the maximum tube diameter in the direction perpendicular to the
direction of the high-frequency scanning. Readjustment may be made for best overall focus. The tubes shall be observed for
deflection defocusing, astigmatism, or spot ellipticity observable to the eye as evidenced by fuzziness due to lack of
sharpness of trace (usually around edges), bow-tying (irregular widths of any single line when observed at different points),
bowing of trace other than that normally caused by curvature of bulb. This test for focus is to be made in addition to the line
width measurements.
2.
The same conditions shall be set up as described in note 1 except that the connection of deflecting elements to the low- and
high-frequency scanning supplies shall be interchanged and the amplitudes adjusted to 90 percent of the maximum tube
diameter in both directions without any adjustment of focus from note 1 conditions. An examination for defocusing,
astigmatism, or spot ellipticity shall be made as in note 1.
3.
As measured with a 2x2 inch raster using a type 3 Photronic cell without eye correction, calibrated in foot candles of
illumination from a light source having a color temperature of 2,700 °K.
4.
This test shall be performed during the initial production and once each succeeding 12-calender 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 note 5). The "12-calender month" sampling plan shall be reinstated after three consecutive samples
have been accepted.
5.
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business