MIL-PRF-1/906E
TABLE I. Testing and inspection - Continued.
MIL-STD-
1311
Inspection
Method
Notes
Conditions
Acceptance
Symbol
Limits
Unit
level
Min
Max
Conformance inspection,
part 3
Life-test provisions
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16/
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Group A; counting
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rate = 1,000 Nps (min);
t = 500 hours
Life-test end point:
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10/ 16/
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Variable-frequency
1031
4/ 12/
vibration
15/
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Temperature cycling
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9/ 14/
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4/ 7/
Shock
1041
Hammer angle = 40°
15/
Leakage current
6205
14/
Ebb = 500 V dc
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LIb
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0.5
µA dc
1/
The response characteristics, current, and count rate versus field intensity, of a typical type 5979 radiation counter tube are shown
on figure 3. In determining tube response, Ebb = 700 V dc and Rp = 1 Meg. Tube current is shown as measured by means of a
microammeter in series with the tube cathode, and the count rates as determined using a scaler having a resolving time of 5
microseconds and a discrimination level of 0.25 volts.
2/
A minimum of 28 samples shall be submitted for qualification test. The samples to be submitted for qualification testing will be
broken down into the following subgroups:
a.
Shelf life only
6
b.
Electrical, including life test
6
c.
Shock test only
10
d.
Variable-frequency vibration
6
3/
Each tube is to have an individual serial number permanently marked on the cathode.
4/
Criterion for passing this test shall be compliance after test of at least 80 percent of the tubes with the requirement for:
a.
Starting voltage.
b.
Response (count rate) (1).
c.
Pulse amplitude (1) and (2).
d.
End-of-plateau voltage.
e.
Relative plateau slope.
5/
In determining tube response (count rate) Ebb = 700 V dc and Rp = 1 Meg ± 10 %. Tube count rates shall be determined using a
scaler having a resolving time of 5 microseconds and a discrimination level of 0.25 volts.
6/
The tube end window shall be exposed to radiation from a General Electric 15-watt germicidal lamp and a General Electric 15-watt
fluorescent lamp, or equivalents, with relative positions as shown on figure 2.
3
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