MIL-PRF-1/781F
TABLE I. Requirements or tests.
Requirement or test
MIL-STD-1311
Notes
Conditions
Symbol
Unit
Limits
method
Min
Max
Conformance
inspection, part 1
---
1
Egk
---
2.0
V dc
Ec = -20 V dc;
Grid-cathode voltage
Rhk = 0
3241
---
If
230
270
mA
Heater current
3201
4
Ec
-11.0
-14.0
V dc
Critical grid voltage for
conduction (1)
Rb/Ib = 100 mA dc
3204
---
Etd
---
18
V dc
Voltage drop
Conformance
inspection, part 2
µA
1336
---
Ehk = -100 V dc
Ihk
---
15
Heater-cathode leakage
dc
3201
---
Ebb = 50 V dc
Ec
-5.0
-7.0
Critical grid voltage
for conduction (2)
V dc
3201
---
Ebb = 300 V dc
Ec
-21
-31
Critical grid voltage
for conduction (3)
V dc
---
2
Ebb = 300 V dc;
---
---
---
Noise output (1)
Rg = 0;
---
Rp = 56,000 ohms
- --
3
Ebb = 250 V dc;
Output
10
---
Noise output (2)
v
Rg = Rk = 0;
Rp = 0.33 MegΩ
Conformance
inspection, part 3
---
---
Group A;
---
---
---
---
Life test
Ebb = 250 V dc;
Ec = -20 V dc;
Rp = 5,000 ohms;
Rhk = disconnected;
Ehk = 110 V;
t = 500 hours
---
Life-test end points:
---
Ec
-9.5
-15.5
V dc
3201
Critical grid voltage
for conduction (1)
3
Output
9.0
---
v
---
Noise output (2)
5
No voltages applied
---
---
---
---
1031
Low-frequency vibration
See footnotes at top of next page.
2
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