MIL-PRF-1/812E
TABLE I. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Symbol
Limits
Unit
MIL-STD-1311
Min
Max
Conformance
inspection, part 3
No voltages applied
Low-frequency vibration
1031
4/
---
---
---
---
1036
4/
Angle = 20°
---
---
---
---
Bump
Low-frequency vibration
---
and shock end points:
V dc
Electrode voltage
1261
---
Ec1
-65
-95
(grid)
Total grid current
ľA dc
1266
---
Ic1
---
-10
Life test
---
---
Group C; power
---
---
---
---
oscillation (1);
t = 500 hours
Life-test end points:
---
Peak emission
1231
---
is
4.0
---
a
Primary grid emission
ľA dc
1266
---
Isg1
---
-100
(control)
Primary grid emission
ľA dc
1266
---
Isg2
---
-200
(screen)
Total grid current
ľA dc
1266
---
Ic1
---
-10
Power oscillation (2)
1236
4/
Ebb = 3,000 V dc;
Po
350
---
W
(useful)
Ib = 200 mA dc;
Ec2 = 350 V dc;
Rg1 = 12,000 ohms;
F = 75 MHz
1/ Adequate cooling shall be provided for the seals and envelope of the tube. An air-system socket and air director (chimney) is desirable,
such as Eimac SK-400/SK-406 or SK-410/SK-406, or equal. At frequencies below 30 MHz, cooling air in the amount of 5 cfm around
the base of the tube past the envelope is required. At frequencies above 30 MHz, losses in the leads and envelope contribute to
heating, and additional cooling may be required. Cooling should be applied simultaneously with filament power, and in all cases there
should be some movement of air past the base and envelope.
2/ Cooling of the tube is permitted to an extent not to exceed that specified in 1/.
3/ This test shall be the first test performed at the conclusion of the holding period.
4/ 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.
3
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