MIL-PRF-1/1392D
TABLE I. Testing and inspection - Continued.
Inspection
Inspection
Method
Type
Conditions
Acceptance
level
Symbol
Limits
Unit
level
or code
Min
Max
Conformance inspection,
part 3
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Group C;
Life-test provisions
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All
t = 500 hours (min)
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P14A
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P7A Eb = 8,800 V dc;
Ec2 = 330 V dc;
Ib = 60 µA dc
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P25 Eb = 8,800 V dc;
Ec2 = 770 V dc
Ib = 40 µA dc
Life-test end points
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P7A
Line width "A"
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0.50
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Line width "C"
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0.60
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P14A Line width "A"
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mm
0.25
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Line width "C"
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mm
0.35
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P25 Line width "A"
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0.20
mm
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Line width "C"
0.30
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mm
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ĆEc1
All Modulation
38
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V dc
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All Heater-cathode
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leakage current
All Grid No. 1 leakage
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current
All Grid No. 2 leakage
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current
All Stray light emission
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1/ When Ec2 is greater than 330 V dc, Rg1 shall not exceed 0.5 Meg. When Ec2 is less than 330 V dc, Rg1 shall not exceed 1.5
Meg.
2/ A limiting aperture type of gun shall be used. The amount of limiting permitted shall be between 15 and 45 percent when Ib
= 200 µA dc and the secondary electron current from the screen to the limiting aperture is zero. The following information and
materials shall be made available to the government representative witnessing the qualification inspection measurements:
(a)
The electron gun drawing with significant dimensions.
(b)
A sample of the electron gun to be used in the manufacture of the tubes.
(c)
A sample tube with suitable connectors to enable measurement of the screen current separately from the limiting aperture
current. This sample tube, at the option of the manufacturer, may be one of the four regular qualification inspection samples or
a fifth tube. If the sample is one of the four regular qualification inspection samples, it shall pass all tests. If a fifth tube is
submitted, it shall pass all electrical tests, but is not required to pass screen quality, and some of the dimensions.
3/ This test to be performed at the conclusion of the holding period.
4/ Displacement of the spot corresponding to the image of the final aperture shall not exceed the limit specified.
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