MIL-PRF-1/1679C
TABLE I. Testing and inspection - Continued.
Limits
Method
Inspection
Notes
Conditions
Symbol
Unit
MIL-STD-1311
Min
Max
Conformance inspection,
part 3 - Continued
7/ 12/ Ef = 25.0 V;
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Long-duration shock
no other voltages applied;
shock = 50 G peak (min);
duration = 11 ± 2 ms;
total impacts = 18;
X, Y, and Z axes
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Long-duration shock
end-point:
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1356
iL
16
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a
Grid-pulse
ĆiL
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10
%
operation (2)
Never negative
Ic2
1/ The drive pulse tr and tf significantly affect anode dissipation. In all cases of operation, the rated element
dissipation shall not be exceeded. The information contained on figure 2 may be used as a guide to safe
cathode current for various combinations of pulse repetition rate and pulse duration.
2/ Tube to operate with constant or decreasing grid current for 2 minutes. If the tube should operate with a rise of
grid current, the grid current shall become constant or decrease within 5 minutes.
3/ Driver pulse duration 2 µs minimum, measured at 95 percent of maximum amplitude, with a tr less than 0.2 µs
and a tf less than 0.4 µs. Variation in amplitude over 80 percent of the top portion of the pulse shall be not more
than 5 percent. Pulse repetition rate shall be 300 to 500, with the exact frequency at the option of the
manufacturer.
Input signal to the control grid shall drive the grid positive by 225 ± 25 volts at the top of the pulse.
The variation of amplitude of the output pulse shall be not greater than specified.
The tube shall operate for a 2-minute period without arcing within the tube which would kickout the overcurrent
relay.
Tube shall be tested in the circuit shown on figure 3, or equal.
A Westinghouse type MN overcurrent relay, style 1158584 (Navy type CAY29095), or equal, which has a 50 to
200 mA dc range shall be used in conjunction with an ac control relay in grid-pulse operation testing and life
testing of this tube type. The dc overcurrent relay shall be equipped with coil No. 1158882 and shall be adjusted
to 200 mA dc. The ac control relay used in conjunction with the dc overcurrent relay shall open the ac line
approximately 20 milliseconds after the overcurrent relay opens. A device shall be incorporated into the relay
circuit which will delay the reapplication of anode voltage for a minimum period of 15 seconds after each kickout
and shall count the number of kickouts.
4/ The adapter wafer shall be subjected to a gradually applied torque of 12.0 pound-inches. This test shall not
cause broken leads, broken welds, broken soldered joints, broken glass, or cracked glass.
4
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