MIL-PRF-1/943E
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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Life-test
15/
Group D;
t = 500 hours
Life-test end point:
Anode current
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16/
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1/
DC supply voltage between anode and 10th dynode.
2/
Averaged over a period of 30 seconds maximum. Longer tube life may be expected when operating conditions require lower
anode current.
3/
An anode load resistance of at least 10,000 ohms is recommended for a protective resistance.
4/
Overall supply voltage is across a voltage divider providing 16.67% of the voltage between cathode and dynode No. 1 and
8.33% of the voltage for each succeeding state including dynode No. 10 to anode.
5/
Omit immersion in water and test dry. Apply torque test with 40.0 pound-inches minimum.
Light source shall be a projection lamp operated at 2,870°K. Use a light aperture 0.172 inch x 0.70 inch (4.37 mm x 17.78
6/
mm) centered with respect to the cathode.
7/
Apply 167 volts dc between cathode and all other pins tied together.
-5
With 10 lumens incident on the cathode vary the overall voltage to give Ib = 200 µA; exclude the light and read the dark
8/
current.
Anode current ratio. In addition to Ib test at center of photocathode, check Ib at four places spaced 90° apart. The spots shall
9/
be exposed one at a time in such a manner that no overlap of outer spots exist (if all were exposed at the same time). The
ratio between maximum and minimum anode currents (including center reading) will be the anode current ratio. Place
aperture between light source and tube such that the outer spots (on the photocathode) will lie on a .875 inch ± .047 inch
(22.23 mm ± 0.79 mm) diameter circle centered on the photocathode. The diameter of the outer spots on the photocathode
shall be .50 inch (12.7 mm) ± 5 percent. All spots including center spot shall have equal area.
10/
Apply Ebb according to the range of Ib in the following table:
Ib
Overall supply voltage
Range
100 to 160
1,350
160 to 240
1,300
240 and up
1,250
11/
With unfiltered light flux of 0.01 lumens, insert blue filter (Corning, Glass Code No. 5113 polished to one-half stock thickness,
or equivalent) in place between the cathode and light source.
3
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