MIL-PRF-1/878G
TABLE I. Testing and inspection - Continued.
Inspection
Method
Conditions
Symbol
Limits
Unit
MIL-STD-1311
Min
Max
Conformance inspection,
part 3
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Group C;
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---
---
---
Life test
power oscillation;
t = 500 hours
Life-test end points:
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Peak emission
1231
is
3.5
---
a
µA dc
Primary grid emission
1266
Isg
---
-500
Low-frequency vibration
1031
No voltages 2/
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---
---
---
Angle = 20° 2/
Bump
1036
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---
---
---
Low-frequency vibration
---
and bump end points:
µA dc
Total grid current
1266
Ic
---
-15
Electrode voltage (grid)
1261
Ec
-27.0
-39.0
V dc
1/
In addition to the 24-hour holding period, 10 percent of the tubes in any production lot shall be held for a period of 72 hours. If
more than 2 percent of the tubes fail to meet the total grid current test, the tubes represented by this sample shall be subject
to recall and all tubes shall be held for a period of 72 hours.
2/
This test shall be performed yearly, with sampling as follows:
n1 = 4
c1 = 0
where c2 represents the total failures for the
n2 = 4
c2 = 0;
first and second samples combined.
In case of failure, the test shall become a conformance inspection, part 2 test for three successive successful submissions, at
which time the test may revert to the yearly basis.
3
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