TB 9-6625-2309-24
(1) Press digital delay generator MENU DELAY pushbutton to decrease A = T+
value by 100 nanoseconds increments until FOCUS generated pulse is just to the right of
cursor A (fig. 23).
(2) Press HOR EXP as required for a display indication of 2.0m/div.
(3) Repeat technique of (1) above using 10 nanosecond increments instead of 100
nanosecond increments (fig. 23 ).
Figure 23. Example of FOCUS generated pulse placement just to right of
cursor A before starting 3 nanosecond increments (TD-260C).
(4) Press VERT EXP as required for a display indication of 2.0 dB/div.
l. To find lowest A = T+ value for FOCUS generated pulse at cursor A, perform steps
(1) through (6) below:
(1) Press FAST SCAN pushbutton, wait for LASER ON/AVG to go off display.
(2) Press digital delay generator MENU DELAY pushbutton to decrease A = T+ in
3 nanosecond increments.
(3) Repeat technique of (1) and (2) above until beginning of FOCUS generated pulse
shifts to left just in front of cursor A (fig. 24).
38