MIL-PRF-1/1232E
TABLE I. Testing and inspection - Continued.
Method
Limits
Inspection
MIL-STD-1311
Notes
Test
Conditions
Symbol
Min
Max
Unit
Conformance inspection,
part 3
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2
Group D;
t
1,000
---
hours
Life test
5/ 6/
F = F3 ± 3%;
R = 2.5 Meg
Life-test end points:
---
Spike-leakage energy
4452
---
1
Ws
---
0.50
erg
Ii = 100 µA dc
Ignitor noise ratio
4460
---
---
Nr
---
1.5
---
µs
Recovery time
4471
---
2
t
---
25
Ii = 100 µA dc
Ignitor voltage drop
4406
---
---
Eid
---
550
V dc
Insertion loss
4416
---
---
Li
---
0.7
dB
Arc loss
4488
---
1
La
---
0.3
dB
Temperature cycling
1027
---
---
---
---
---
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10 cycles
life test
1/ A suitable gasket shall be bolted between the tube and the mounting seat. Tubes shall be supplied with gaskets at both ends.
2/ Preproduction sample approval requirements hereby replace any qualification requirements referable to the product covered
herein. The term "First article testing" shall be considered as synonymous with the term "Preproduction sample approval
testing." All tests applicable herein (including all preproduction sample approval and conformance inspection, parts 1, 2, and 3)
shall be performed during preproduction sample inspection. A failure of any one tube in any of the tests shall be cause for
decision of preproduction sample disapproval.
3/ The tube shall be capable of being inserted and removed from its seat a minimum of 15 times with no deterioration in the
tube's electrical characteristics.
4/ A swept frequency method may be used for this test.
5/ The TR tube will be terminated with a waveguide to type N transition (VSWR not to exceed 1.1:1 at test frequency) and a
coaxial type N crystal mount connected to the transition. The mount will contain a type 1N21WE crystal which will be
terminated by a dc ground return of 100 ± 10 ohms. The crystal mount will have a VSWR not to exceed 1.5 when tested with a
microwave source at the test frequency which provides a crystal dc current between 0.3 ma to 1.5 ma in a 100 ohms
termination. At the beginning of life test, the crystal noise figure (NF receiver) shall not exceed 7.0 dB under the standard
1N21WE test conditions. The actual crystal noise figure at the beginning of life shall be recorded.
6/ The crystal noise figure degradation from the initial value shall not exceed 1.5 dB maximum. One crystal failure will be allowed
during the life test. If a crystal failure occurs, a new crystal shall be inserted in the mount and the life test shall continue for a
minimum of 100 hours.
3
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