Downloaded from https://www.everyspec.com MIL-STD-1311D 7. Emission oscillation. This test shall be made with the tube operating under the oscillation-test conditions after the power- oscillation test. The filament potential shall be changed as specified and the change in power output or cathode current shall be within the limit(s) specified. 8. Pulse emission. The tube shall be tested for pulse emission in the circuit shown on figure 1231-1. A resistor shall be substituted for the TUT for calibration purposes. Ra, Rp, and the calibrating resistor (as shown on figure 1231-1) shall be within ± 5 percent of that specified on the TSS and shall be noninductive.
The control grid, and the screen grid when present, shall be tied directly to the anode. The calibrated pulse voltage amplitude shall be within the value specified over 80 percent of the top portion of the pulse and shall not vary from this value by more than 5 percent. The modulator impedance shall be as specified on the TSS. The pulse voltage characteristics shall be tp = 5.0 ± 0.25 µ s; tr = 0.5 µ s maximum; tf = 1.0 µ s maximum. The pulse emission shall be within the limit(s) specified on the TSS. FIGURE 1231-1. Circuit for testing pulse emission. METHOD 1231A 1231-2 28 March 1975