Downloaded from https://www.everyspec.com MIL-STD-1311D CURRENT DIVISION 1. Long pulse (Method A): 1.1 General. Unless otherwise specified, the following conditions apply (see figures 1372-1 and 1372-2): a. DC voltages to electrodes .................................................... As specified. b. Pulse duration (tp) ............................................................... 1,000 µ s to 4,500 µ s. c. Pulse recurrence rate (prr) ................................................... 11 ± 2 pps. d. Grid voltage pulse (egk) ....................................................... Square wave (adjust for procedure (a) or (b)). e.
Input wave shape (tr), (tf) ..................................................... 25 µ s, max, each. Top slope ( ic) ..................................................................... 0.5 percent, max. Ripple .................................................................................. 0.1 percent, max. 1.2 Procedure. a. The magnitude of the grid-voltage pulse shall be adjusted to produce the specified anode current at the leading edge of the pulse, excluding any spike. The magnitude of the grid-voltage pulse (egk) relative to zero level shall be within the limit(s) specified.
When indicated, the magnitudes of the grid current(s) ic1, ic2, ic3, etc., shall be within the limit(s) specified. b. The magnitude of the grid-voltage pulse shall be adjusted to bring the grid to zero voltage level during the pulse. The magnitude of the pulse anode current (ib) and, when indicated, the grid current(s) ic1, ic2, ic3, etc., shall be read at the leading edge, excluding spike, and shall be within the limit(s) specified. c. Pulse duration (tp) should be adjusted to a maximum value between the specified values stated commensurate with practical limitations of the tubes element dissipations. 2. Short pulse (Method B): 2.1 General.
The dc voltages applied to the tube electrodes shall be as specified. The pulse duration (tp), pulse recurrence rate (prr), and type of pulse used shall be appropriate for the TUT. The magnitude of the grid-voltage pulse shall be adjusted as required for either procedure a or procedure b. 2.2 Procedure. a. The magnitude of the grid-voltage pulse shall be adjusted to produce the specified peak anode current (ib). The magnitude of the grid-voltage pulse above zero level (egk) shall be within the limit(s) specified. When indicated, the magnitude of the grid current(s) ic1, ic2, ic3, etc., shall be within the limit(s) specified. b.
The magnitude of the grid-voltage pulse shall be adjusted to bring the grid to zero voltage level at the peak of the pulse. The magnitude of the peak pulse anode current (ib), and when indicated, the magnitude of the peak grid current(s) ic1, ic2, ic3, etc., shall be within the limit(s) specified. METHOD 1372A METHOD 1372A 1372-1 7 January 1972