MIL-PRF-1/973E
TABLE I. Testing and inspection - Continued.
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Criterion for passing this test shall be compliance after test of at least 80 percent of the sample tubes with
the requirements for:
a. Starting voltage.
b. Response count rate (gamma).
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 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.
7/
Use Government approved standard gamma-test unit.
8/
With the tube in a field giving 100 ± 10 Nps at 700 V dc, the tube response (count rate) at 675, 700, and 725
V dc shall be determined at each of the following temperatures and in the order shown:
a.
Room temperature.
b.
-40°C.
c.
Room temperature.
d.
75°C.
e.
Room temperature.
A minimum stabilization time of 30 minutes shall be allowed at each temperature. The absolute count rate at 700 V
dc, and the average relative plateau slope as determined by the readings at the 3 voltages (best average position of
straight line), shall not differ from the initial readings at room temperature by more than 10 percent and ± 0.1
percent/volt, respectively, at any of the four subsequent temperatures shown.
9/
The limits for acceptability shall be as follows:
a.
Background, contamination, and photosensitivity: 12 Npm, maximum.
b.
Starting voltage: Initial value ± 10 volts.
c.
Plateau length: 125 volts, minimum.
d.
Relative plateau slope: 0.25 percent/V dc, maximum.
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