TB 9-6625-2139-24
(b) A SEC/DIV switch to .1 ms.
(c) B SEC/DIV switch to 1 Ps.
(d) B DELAY TIME POSITION dial to 1.00.
(36) Adjust A/B SWP SEP control to separate A and B sweeps.
(37) Adjust R646 DELAY START (fig. 2) so that the 2d A sweep time marker is
intensified and the B sweep time marker's rising edge starts at the beginning of B
sweep. (R)
(38) Adjust B DELAY TIME POSITION dial to 9.00.
(39) Adjust R652 DELAY END (fig. 1) so that the 10th A sweep time marker is
intensified and the B sweep time marker's rising edge starts at the beginning of B sweep.
(40) Adjust B DELAY TIME POSITION dial to 1.00.
(41) Repeat (32) through (35) above until no further improvement is noted.
(42) Continue calibration at paragraph 9 a (26) above.
(43) Set HORIZONTAL MODE switch to B.
(44) Adjust R760 X GAIN (fig. 2) for 5 divisions of horizontal display. (R)
(45) Continue calibration at paragraph 9 a (36) above.
a. Performance Check
(1) Position controls as listed in (a) through (m) below:
(a) VERTICAL MODE CH 1 BOTH CH 2 switch to CH 1.
(b) CH 1 and CH 2 VOLTS/DIV switches to 5m.
(c) A AND B SEC/DIV switches to .2 Ps.
(d) B DELAY TIME POSITION dial fully ccw.
(e) B TRIGGER SLOPE pushbutton to OUT.
(f) B TRIGGER LEVEL control to midrange.
(g) A TRIGGER P-P AUTO pushbutton pressed.
(h) A TRIGGER SLOPE pushbutton to OUT.
(i) A TRIGGER LEVEL control to midrange.
A TRIGGER A TRIG BW switch to FULL (AN/USM-488).
(j)
(k) A TRIGGER A&B INT switch to VERT MODE (type 2235).
(l) A TRIGGER A SOURCE switch to INT.