MIL-PRF-1/985D
TABLE I. Requirements and tests.
Limits
MIL-STD-1311
Requirement or test
Unit
Conditions
Symbol
method
Min
Max
First article test
Low-frequency vibration
1031
No voltages
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Conformance inspection,
part 1
Operation of rectifiers (1)
1353
See notes 2 and 3
Io
285
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mA dc
Emission
1231
Eb = 75 V dc
Is
350
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mA dc
See note 4
Conformance inspection,
part 2
Alignment
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See note 5
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Filament current
1301
If
2.7
3.3
A
ĆIo
Operation of rectifiers (2)
1353
Ef = 4.5 V ac
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10
%
If
Insulation of electrodes
1211
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Secureness of base, cap,
1101
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or insert
Permanence of marking
1105
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Conformance inspection,
part 3
Life-test provisions
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Group B, see note 6
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Life-test end point
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(500 hours)
Operation of
1353
Io
275
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mA dc
rectifiers (1)
NOTES:
1.
Tube shall be operated in a vertical position. Tube may be mounted in a horizontal position provided pins no.
2 and 4 are in a vertical plane.
2.
In a full-wave circuit Zp/a shall be adjusted such that a tube having Etd = 44 V dc at 225 mA dc per anode
gives Io = 300 mA dc.
3.
This test shall be performed at the conclusion of the holding period.
4.
Test each section separately. Anode voltage = 0 for section not under test.
5.
The plane of the filament shall be parallel to the plane passing through the centerline of pins No. 2 and 4 within
±22.5°.
6.
The values of R1 and CL given in test conditions may be considered as approximate and shall be adjusted
initially to give Io = 300 mA dc with ib ≥1.1A.
2
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