MIL-PRF-1/952H
TABLE I. Testing and Inspection - Continued
Method
Acceptance
Limits
Requirement or Test
Conditions
Symbol
Unit
MIL-STD-
level
Min
Max
1311
note 9
Conformance inspection, part
2 Continued
Post-shock and vibration
---
fatigue test end points:
Low-frequency vibration
1031
---
Ep
---
450
mV ac
Master-cathode leakage
1336
---
Ihk
---
30
uA dc
Transconductance (1)
1306
---
Sm
3,600
---
umhos
Total grid current
1266
---
Ic1
0
-2.0
uA dc
Base strain
1121
See note 7
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---
---
---
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Envelope strain
2126
2.5
---
---
---
---
Permanence of marking
1105
---
---
---
---
---
Conformance inspection
Part 3
Heater-cycling life
Ef = 7.5 V;
Ehk = +135 V dc;
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---
---
---
---
Ec1 = Ec2 = Eb = 0
Heater-cycling life-test
---
end point:
Heater-cathode leakage
1336
---
IhK
---
20
mA dc
Stability life
1516
Eb = 300 V dc;
Ehk = +135 V dc;
Rg1 = 0.5 MegΩ;
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---
---
---
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Rk = 80 ohms;
TA = room
Stability life-test end point
---
(2 and 20 hours):
Change in transcon-
Ćsm
1306
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---
10
%
ductance (1) of
individual tubes
Intermittent life
1501
Eb = 300 V dc;
Ehk = +135 V dc;
Rg1 = 0.5 MegΩ;
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Rk = 80 ohms;
TE = 165° C (min)
See notes 8 and 10
Intermittent life-test
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end points (1,000 hours):
Inoperatives
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3
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