MIL-PRF-1/1261H
TABLE I. Testing and inspection - Continued.
Method
Limits
Inspection
MIL-STD-1311
Type
Conditions
Symbol
Unit
Min
Max
Conformance inspection,
part 3 - Continued
Cathode ray tubes,
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life-test end points:
Line width A
P1A,
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0.50
mm
P7A
Line width A
P19A
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0.35
mm
Modulation
P1A,
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32
V dc
P7A
Modulation
P19A
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15
V dc
Grid No. 1 leakage
All
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Heater-cathode
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leakage
Grid No. 2 leakage
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Stray emission
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1/ When Ec2 is greater than 330 V dc, Rgl shall not exceed 0.5 meg. When Ec2 is less than 330 V dc, Rg1 shall not exceed 1.5
MegΩ.
2/ The test shall be performed in accordance with method 205, test condition A, of MIL-STD-202.
(a) The following conditions apply:
(1) The tube shall be mounted to the elevator table by a suitable rigid assembly. Hardwood clamps shall be used at the
face plate and near the neck to secure the tubes to the assembly.
(2) The assembly shall be such as to permit changes in tube orientation. A total of 10 shocks shall be applied to the tube
in the following sequences:
Order
Number of drops
Direction
1
2
Base to face
2
2
x+
3
2
x-
4
2
y+
5
2
y-
(3) No potentials shall be applied during shock.
(b) After shock test, cathode-ray tubes shall meet the requirements specified and shall be subjected to the following tests:
(1) The change in position of the undeflected focused spot from its position noted before the test (see method 5231)
shall not exceed 8 mm.
(2) The change in deflection factor for electrostatic tube types shall not exceed 5 percent (see method 5248).
(3) Starting with a tube with no loose particles, the maximum number of loose particles as a result of shocking shall be no
more than a total of five loose particles greater than .016 inch (0.41 mm) in any one cathode-ray tube. Tubes having
loose particles greater than .016 inch (0.41 mm) shall be vibrated with the face down in a horizontal plate at 5 G's for
1 minute. If the screen shows damage from such vibration, the tube shall be rejected.
(4) The change in grid cutoff voltage shall not exceed 10 percent (see method 5241).
(5) There shall be no damage to the external parts of the tube.
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