MIL-PRF-1/1388G
TABLE I. Testing and inspection - Continued.
Inspection
Method
Notes
Conditions
Symbol
Limits
Unit
MIL-STD-1311
Min
Max
Conformance inspection,
part 3
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Group D;
Life test
Ebb = 1,400 V dc;
N/t = 1,000 Npm;
t = 250 hours
Life-test end points:
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±10
6221
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N/t
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%
Response count rate
and current (beta)
±10
6221
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N/t
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%
Response count rate
and current (gamma)
Variable-frequency vibration
1031
1/ 10/
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Ebb = 0
20/
±20
Temperature range, operating
1026
4/
N/t
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%
Packaging
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16/
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1/
Criterion for passing this test shall be compliance after test of at least 80 percent of the tubes with the requirements for the
following:
(a) Starting voltage.
(b) End-of-plateau voltage.
(c) Relative plateau slope.
(d) Response count rate and current (beta).
(e) Response count rate and current (gamma).
2/
The tube shall be exposed to radiation from a General Electric 4-watt germicidal lamp, Type G-4T4/1, or equivalent, with
relative positions as shown on figure 2.
The counting rate shall not vary by more than ±0.10 N/t from the value (approximately 10,000 counts per minute (cpm))
3/
marked on the Standard Beta Reference Source (SBRS). The SBRS shall be mounted in recess of the sample positioning
shelf specified with the SBRS. The proper position of this shelf for this test is specified with the SBRS.
With the tube in a field giving 10,000 ± 100 Npm at 1,400 V dc, tube response (count rate) shall be determined at 1,300,
4/
1,400, and 1,600 V dc at each of the following temperatures and in the order shown.
(a)
Room temperature.
5°C.
(b)
(c)
Room temperature.
40°C.
(d)
(e)
Room temperature.
3
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