MIL-PRF-1/877E
TABLE I. Testing and inspection.
Inspection
Method
Notes
Conditions
Symbol
Limits
Unit
MIL-STD-1311
Min
Max
Conformance inspection,
part 1
5.8
6.6
A ac
If Ec(1)
Filament current
---
1301
Electrode voltage (1)
---
1261
Ec(2)
V dc
-34.0
-46.0
(grid)
Ic
Electrode voltage (2)
---
Eb = 14.0 kV dc;
1261
V dc
---
-550
(grid)
Ec/Ib = 1.0 mA dc
Isg
Total grid current
1/
1266
---
-10
ľA dc
1266
---
Ic = 100 mA dc;
---
-500
ľA dc
Primary grid emission
is
t = 15 seconds;
Ef = 5.5 V ac
---
eb = ec = 2,500 v
1231
3.0
---
a
Peak emission
Conformance inspection,
part 2
1316
Amplification factor
---
Mu
34.0
42.0
---
W
Power oscillation
1236
---
Po
270
---
F = 8 MHz;
(useful)
Eb = 3,000 V dc;
Ib = 150 mA dc
pF
1331
Direct-interelectrode
---
1.7
2.3
Cgp
pF
capacitance
2.5
3.4
Cin
pF
---
0.45
Cout
Conformance inspection,
part 3
Low-frequency vibration
1031
2/
No voltages applied
---
---
---
---
Bump
1036
2/
---
---
---
---
Angle = 10°
Life test
---
---
Group C; power
---
---
---
---
oscillation;
t = 500 hours
---
---
Life-test end points:
Peak emission
1231
---
is
2.5
---
a
Primary grid emission
1266
---
Isg
---
-500
ľA dc
1/ This test is to be the first test performed at the conclusion of the holding period.
2/ This test shall be performed during the initial production and once each succeeding 12-calendar months in which there is
production. A regular double sampling plan shall be used, with the first sample of three tubes with an acceptance number of zero,
and a second sample of three tubes with a combined acceptance number of zero. In the event of failure, the test will be made as a
part of conformance inspection, part 2, code level D, with an acceptance level of 6.5. The regular "12-calendar month" double
sampling plan shall be reinstated after three consecutive samples have been accepted.
2
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