TB 9-6625-2240-35
(7) 20 MHz BW/TRIG VIEW pushbutton pressed in and released to full
c. Position A and B triggering controls as listed in (1) through (7) below:
(1) A TRIGGER LEVEL control to 0 and SLOPE switch to + (positive).
(2) B (DLY'D) TRIGGER LEVEL control to 0 and SLOPE switch to + (positive).
(3) A TRIGGER SOURCE switch to NORM.
(4) B TRIGGER SOURCE switch to STARTS AFTER DELAY.
(5) A and B triggering COUPLING switches to AC.
(6) TRIG MODE AUTO pushbutton pressed (in).
(7) A TRIG HOLDOFF switch to NORM.
d. Position TI A and B sweep controls as listed in (1) through (5) below:
(1) A and B TIME/DIV switches to 1 ms and VAR control fully cw (detent).
(2) HORIZ DISPLAY A (A LOCKS KNOBS for all models SN B250000 and
above) pushbutton pressed (in).
(3) DELAY TIME dial to 0.00.
(4) X10 MAG pushbutton out.
(5) Horizontal POSITION (FINE) controls to midrange.
e. Connect TI to ac power source.
f. Pull POWER switch to ON and allow at least 20 minutes for warm-up.
g. Adjust INTENSITY, FOCUS, and ASTIG controls for suitable display.
a. Performance Check
(1) Ensure CH1 VOLTS/DIV switch is set to 5 m (10 m for Tektronix, Type 475A).
(2) Adjust CH1 POSITION control to align trace on center horizontal graticule
line.
(3) Set CH1 VOLTS/DIV switch to 2 m (5 m for Tektronix, Type 475A). If trace
does not remain aligned with center horizontal graticule line, adjust R135 (fig. 1) to align
trace with center horizontal graticule line.
(4) Repeat (1) through (3) above for minimum trace shift when changing CH1
VOLTS/DIV switch from 5 m to 2 m (10 m to 5 m for Tektronix, Type 475A).
(5) Press VERT MODE CH2 pushbutton.