MIL-PRF-1/4K
TABLE I. Requirement or test - Continued.
Limits
MIL-STD-1311
Conditions
Symbol
Requirement or test
Unit
method
Min
Max
Conformance inspection,
part 2 - Continued
Noise and microphonics
2201
Ef = 6.3 V ac;
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Ehk = 0;
Ecc2 = 200 V dc;
Ec1 = 0;
Ebb = 200 V dc;
Ecal = 175 mV ac;
Rk = 1,000 ohms;
Rp = 0.1 MegΩ;
Rg2 = 0.5 MegΩ;
Cg2 = 2 µF
Direct-interelectrode
1331
Shield No. 316
Cgip
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0.020
pF
capacitance
Cin
3.40
4.6
pF
Cout
2.45
3.25
pF
Low-frequency vibration
1031
Rp = 10,000 ohms;
Ep
---
200
mV ac
10 G; F = 40 Hz
Shock
1041
450 G; Ehk = +100
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V dc (see note 5)
Vibration-fatigue
1031
2.5 G; fixed
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frequency; F = 25
min, 60 max
Post-shock and
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vibration-fatigue test
end points:
Low-frequency
1031
Ep
---
300
mV ac
vibration
µA dc
Heater-cathode
1336
Ihk
---
30
leakage
µmhos
Transconductance (1)
1306
Sm(1)
3,500
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µA dc
Total grid current
1266
Ic1
0
- 0.2
Base strain
1121
See note 7
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Glass strain
2126
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Permanence of marking
1105
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See notes at end of table.
3
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