MIL-PRF-1/1404E
TABLE I. Testing and inspection - Continued.
Inspection
Method
Conditions
Acceptance
Symbol
Limits
Unit
MIL-STD-
Level
Min
Max
12/
1311
Conformance inspection,
part 3
Cycles
---
5,000
---
---
Ef = 3.0 V ac
1506
Heater-cycling life
(series connected)
Heater-cycling life-test
---
end point:
1301
Filament current (1)
---
If
320
370
mA dc
---
---
---
---
---
Intermittent life
1501
Ef = 2.5 V ac;
F = 60 Hz;
Ebb = 150 V dc;
Ecc2 = 125 V dc;
Ecc1 = -10 V dc;
Rl = 1,000 ohms;
Rg2 = 470 ohms;
Eg1 = 13 V ac;
Rg1 = 4,700 ohms;
C1 = 16 µF
(see figure 2)
10/
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Intermittent life-test
end points (500 hours):
mA ac
---
47
Ip
0.65
---
Operation current (1)
---
1.4
Po
0.65
1236
Power oscillation (2)
W
Periodic-check test
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---
---
---
1202
---
Filament burnout
1/
Vertical mounting is preferred. For horizontal mounting, pins No. 4 and No. 5 shall be in the same horizontal plane.
2/
See "Reduced pressure (altitude) rating", and altitude, maximum peak voltage in the basic document.
3/
This is essentially a variable-frequency vibration test. The tubes under test shall be mounted rigidly on a table vibrating, at simple
harmonic motion, over a frequency range of 10 to 2,000 Hz. The amplitude shall be kept constant at 0.04 inch (1.00 mm) from 10
to 55 Hz; and, from 55 to 2,000 Hz, the peak acceleration shall be kept constant at 10 G. Each tube shall be subjected to vibration
cycles in orientations X, Y, and Z. The time for one complete cycle: 10 to 2,000 to 10 Hz, shall be 6 minutes ± 1 minute. The time
of vibration for each tube in each of the three orientations shall be 30 minutes ± 5 minutes.
4/
This test is to be performed at the conclusion of the holding period.
5/
Test at power line frequency (see figure 1). Tubes shall not be preheated immediately before this test.
6/
W ith the voltages applied as specified, adjust Ec1 to provide Ic2 = 9 mA dc on the positive half-cycles.
5
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