MIL-PRF-1/1298E
TABLE I. Testing and inspection.
Inspection
Method
Notes
Conditions
Symbol
Limits
Unit
MIL-STD-
1311
Min
Max
Conformance inspection,
part 1
µA dc
4.0
2.0
5301
Ib
Anode current
5/
µA dc
Dark current
5301
5/
Ib
---
0.00005
Gas ratio
---
3/ 5/
Gr
---
1.5
---
Conformance inspection,
part 2
Secureness of base, cap, or insert
1101
2/
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Permanence of marking
1105
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Conformance inspection,
part 3
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Group C;
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Life test
4/
Ebb = 250 V dc;
t = 500 hours (min)
Life-test end points:
---
µA dc
Anode current
5301
---
Ib
1.0
---
Low-frequency vibration (25 Hz)
1031
6/
No voltages applied
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---
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Direct-interelectrode
1331
6/
Cpk
1.6
3.0
pF
capacitance
Spectral response identification
5303
S1
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6/
1/ The light during test, except in the case of life-test operating conditions, shall be incident upon a .500 inch (12.70 mm) diameter
aperture whose center is located 2.13 inches (54.10 mm) above bottom edge of base, centered with respect to axis of tube.
2/ Immersion in water shall be omitted and tubes shall be tested dry. Torque shall be applied with 20.0 pound-inch minimum for
base, 1.5 pound-inch for cap.
3/ Gas ratio = (Ib at Ebb = 250 V dc) .
(Ib at Ebb = 25 V dc)
4/ The luminous flux at the cathode shall be adjusted to give an average current of 9.0 mA on an average tube. Color
temperature shall be greater than 2,000°K.
5/ This test to be performed at the conclusion of the holding period.
6/ 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 one. 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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