MIL-PRF-1/1225F
TABLE I. Testing and inspection.
Inspection
Method
Conditions
Acceptance Symbol
Limits
Unit
MIL-STD-
Level 11/
1311
Min
Max
Conformance inspection,
part 1
Heater current
1301
0.4
If
285
315
mA
µA dc
Heater-cathode leakage
1336
0.4
Ihk
---
15
µA dc
2/
Total grid current
1266
0.4
Ic1
0
-0.5
Anode current (1)
1256
Ebb = 180 V dc;
0.4
Ib
8.0
18.0
mA dc
Ecc1 = 0; Ecc2 = 150 V dc;
Ecc3 = 0; Rk = 78 ohms 2/
µA dc
Anode current (2)
1256
Ec1 = -6.0 V dc; Ebb = 180 V dc;
0.4
Ib
---
100
Ecc2 = 150 V dc; Ecc3 = 0;
Rk = 78 ohms
Screen-grid current
1256
0.4
Ic2
2.9
3.7
mA dc
µmhos
Transconductance (1)
1306
0.4
Sm
14,200
18,800
Short and discontinuity
1201
0.4
---
---
---
---
detection
Conformance inspection,
part 2
MegΩ
Insulation of electrodes
1211
2.5
R
20
---
ĆSm
Transconductance (2)
1306
Ef = 5.7 V
2.5
---
15
%
Ef
µA dc
Grid emission
1266
Ef = 7.5 V;
2.5
Ic1
0
-0.5
Ec1 = -6.0 V dc;
Rk = 0 3/
Noise and microphonics
2201
Ef = 6.3 V; Ehk = 0;
2.5
---
---
---
---
Ebb = Ecc2 = 200 V dc;
Ec1 = 0; Ecal = 600 mV ac;
Rk = 1,000 ohms;
Rp = 0.1 MegΩ; Rg2 = 0.5
MegΩ;
Cg2 = 2 µF 4/
Cg1p
Direct-interelectrode
1331
Shield No. 315 5/
---
0.030
pF
Cin
capacitance
6.7
8.5
pF
6.5
Cout
2.50
3.50
pF
Low-frequency vibration
1031
Rp = 2,000 ohms
6.5
Ep
---
300
mV dc
450 G; Ehk = +100 V dc 7/
Shock
1041
---
---
---
---
---
Vibration fatigue
1031
2.5 G; F = 25 min, 60 max;
6.5
---
---
---
---
fixed frequency
See footnotes at end of table.
2
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