MIL-PRF-1/852E
TABLE I. Testing and conditions.
Limits
MIL-STD-
Symbol
1311
Requirement or test
Notes
Conditions
Acceptance
Unit
Min
Max
Level 8/
method
Conformance inspection,
part 1
Heater current
1301
990
mA
0.65
If
810
1336
Heater-cathode
100
µAdc
0.65
Ihk
---
leakage
1266
Total grid current
-4.0
1
µAdc
0.65
Ic1
0
1256
Electrode current (1)
48
1
µAdc
0.65
Ib
24
(anode)
1256
Electrode current (2)
500
µAdc
Ec1 = -100 Vdc
0.65
Ib
---
(anode)
1236
Power oscillation
---
w
Ec2 = 200 V dc;
0.65
Po
33
Rg1 = 0.01 MegΩ;
Ib = 100 mAdc (max);
Ic1 = +mAdc;
F = 15 MHz;
Eccl = 0
Short and discontinuity
1201
---
---
0.4
---
---
detection
Conformance inspection,
part 2
MegΩ
Insulation of electrodes
1211
50
---
Ep-all = -500 Vdc;
2.5
R
Eg1-all = -300 Vdc
Electrode current
1256
0
3.0
mAdc
2.5
Ic2
(screen)
Grid emission
1266
0
2
-6.0
Ef = 7.5 V;
µAdc
2.5
Ic1
Ec1 = -70 V dc
1306
Transconductance (1)
4,500
6,500
Eb = Ec2 = 250 V dc;
µmhos
6.5
Sm
Ec1 = -15 Vdc
ĆSm
1306
Transconductance (2)
---
10
Ef = 5.7 V;
%
2.5
Eb = Ec2 = 250 Vdc;
Ef
Ec1 = -15 Vdc
1266
Primary grid emission
0
4
-750
Eb = Ec2 = 0;
µAdc
6.5
Isc2
(screen)
Eg2 = 175 Vac
Cg1p
Direct-interelectrode
1331
---
0.2
Shield No. 312
pF
6.5
Cin
capacitance
8.0
14
No shield
pF
Cout
5.3
8.7
No shield
pF
---
Barometric pressure,
1002
---
---
Pressure = 55±5 mm Hg;
---
6.5
reduced
Voltage = 700 Vac
Ep
Low-frequency vibration
1031
---
250
Eb = 250 Vdc;
mVac
2.5
Ec1 = -10 Vdc;
Ec2 = 100 Vdc;
Rp = 2,000 ohms
See notes at end of table I.
2
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