MIL-PRF-1/385D
TABLE 1. Testing and inspection -Continued.
Inspection
Method
Notes
Conditions
Symbol
Limits
Limits
Units
MIL-STD-1311
Min
Max
Conformance inspection,
part 3
Life test
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-
Group C;
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Light = 7.5 fL;
Eb2 = 2,200 V dc;
t = 500 hours
Life-test end points:
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Ec
Modulation
5223
-
Light = 7.5 fL
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50
V dc
Line width "A"
5226
-
Light = 7.5 fL
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0.70
mm
Width
Line width "B"
5226
-
Light = 7.5 fL
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1.05
mm
Width
NOTES:
1. The center of the "gas cross" appearing inside pattern will not appear due to presence of rod in tube face.
2. This test to be performed at the conclusion of the holding period.
3. Modify the regular procedure of line width measurements in the following manner: Adjustment shall be made for best
focus at a point ½ inch (12.70 mm) from the center of the radial deflecting electrode terminal along the line of the
high-frequency scan.
4. Using mask centered with respect to tube face, set diameter of scanned circle to 1.375 inch (34.93 mm) and remove
mask. Apply and adjust 35 KHz signal on D5 (rod) so that minimum width of annular pattern is 5 mm. The maximum
radial width of same pattern shall be within the limit specified. The peak voltage shall be within the limits specified.
5. The tubes shall be observed for deflection defocusing, astigmatism and spot ellipticity observable to the eye, as
evidenced by fuzziness due to lack of sharpness of trace (usually around the edges), bow-tying (irregular widths
of any line when observed at different points) and bowing of trace other than that normally caused by curvatures
of the bulb.
6. An examination for defocusing, astigmatism, or spot ellipticity shall be made as in note 5.
7. The following applies to tube type 3DP1A+S2.
(a)
Before application of the inscription, the tube shall have passed all requirements of this
specification sheet.
(b)
The inscription outlined on figure 2 shall be secured to the tube and be positioned in the
following manner:
(1) The trace produced by deflecting electrodes 1D2 shall not deviate by more than 2.5
degrees from a line passing through scale markings 0 and 2.5 on the inscription.
(2) The position of zero on the inscription shall be 64.28 degrees 12.5 degrees clockwise
from the centerline of the base lug key, looking at the tube face.
(3) The inscription shall be centered with respect to the tube face within .047 (1.19 mm) of an inch.
(4)
Mask center electrode.
(5)
After masking, the tube face shall be sprayed with a light coat of clear lacquer.
8. This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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