MIL-PRF-1/193E
Table I. Testing and Inspection. -Continued
Inspection
Method
Notes
Conditions
Symbol
Limits
Limits
Unit
Min
Max
Conformance
inspection, part 3
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Group A;
-
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Life test
Rp/Ib = 30 mA dc
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Life-test end points
(500 hours):
V dc
133
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Ez
-
3347
Ionization voltage (1)
V dc
113
---
Eb
-
3337
Voltage drop (2)
V dc
---
103
Eb
-
3337
Voltage drop (3)
V dc
4.0
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6
3335
Regulation (1)
V dc
2.5
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-
3335
Regulation (2)
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No voltages
7
1031
Variable-frequency
applied
vibration (Type 0C3W )
V dc
210
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Ez
Rp/Ib = 5 to
7, 8
3347
Ionization voltage (2)
40 mA dc
(total darkness)
NOTES:
1. Pins 3 and 7 tied internally.
2. Fixed resistors may be used and Ebb varied to give desired current.
3. Test to be conducted with the tube exposed to light intensity of 5 to 50 footcandles.
4. This test to be performed at the conclusion of the holding period.
5. This test applies for flexible leads as well as for rigid leads.
6. The tube shall have reached the end of its life with regard to regulation (1) when that regulation first
exceeds the value of 4.0 volts.
7. This test shall be performed during the initial production and once each succeeding 12-calendar
months in which there is production. An accept on zero defect sampling plan shall be used, with
a sample of three tubes with an acceptance number of zero. In the event of failure, the test will
be made as a part of conformance inspection, part 3, with an acceptance level of 6.5 (see note 9).
The regular "12-calender month" sampling plan shall be reinstated after three consecutive samples
have been accepted.
8. Test to be conducted with the tube under test enclosed in a light tight enclosure composed of a
non-conducting material. Measurements to be performed after the test specimen is held in the
enclosure for 24 hours. The tube shall fire within 15 seconds.
9. This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
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