MIL-PRF-1/1657E
TABLE I. Testing and inspection - Continued.
Method
Limits
Inspection
MIL-STD-1311 Notes
Conditions
Symbol
Min
Max
Unit
Conformance inspection,
part 3 - Continued
---
Stability life-test
end point:
Sm
Transconductance (1)
1306
---
---
15
%
t
---
---
---
---
Survival-rate life
1521
13/ 15/ Stability life test,
or equivalent
conditions;
TA = room temp,
25C 5C;
t = 100 hours
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Survival-rate life test
end points:
A dc
1256
---
Ib
---
50
Electrode current (2)
(anode)
mhos
Transconductance (1)
1306
---
Sm
9,000
---
t
2,000
---
cycles
Intermittent life
1501
10/ 14/ Group C;
Ef = 6.3 V;
Ebb = 250 V dc
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Intermittent life-test
end points:
Output power (1)
4250
Po
0.90
---
W
---
A dc
Total grid current
1266
---
Ic
---
-1.0
MegΩ
Insulation of electrodes
1211
---
R
60
---
Pressure = 8 2
---
---
---
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1002
18/
Barometric pressure,
reduced
mmHg;
voltage = 300 V ac
1/
Test in capacitance jig RCA Capacity Adapter Model H-1756E, or equivalent. A capacitance
bridge operating frequency of 1.0 to 2.0 kHz may be used.
2/
The tube shall be vibrated perpendicular to the major tube axis through a frequency range
from 5 to 500 Hz and back. From 5 to 50 Hz, the tube shall be vibrated at a constant
displacement of 0.040 0.0025 inch (1.02 0.06 mm). From 50 to 500 Hz, the tube shall be
vibrated at a constant acceleration of 10 2 G. Total time to complete a sweep cycle shall be
10 5 minutes.
a.
Each tube shall be vibrated for 60 seconds at the frequency that gives maximum
vibration output. If at the end of 60 seconds the vibration output is still increasing, the
vibration shall continue until there is not further increase.
b. The tube shall be rejected for vibration output voltage exceeding the limit specified herein.
3/
This test is to be the first test performed at the conclusion of the holding period.
4
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