TB 9-6625-2240-24
(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) Press TRIG MODE AUTO pushbutton (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) Set 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.
8. Vertical Deflection
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.
(6) Repeat technique of (1) through (4) above using CH2 POSITION control and
adjusting R235 (fig. 1).
(7) Press VERT MODE CH1 pushbutton and set CH1 AC-GND-DC switch to DC.
(8) Set CH1 VOLTS/DIV switch to 2 m (5 m for Tektronix, Type 475A) and connect
TI CH1 to oscilloscope calibrator CHAN 1.
(9) Press oscilloscope calibrator VOLTAGE pushbutton to illuminate green LED
and set frequency to 1 kHz.
