TB 9-4931-504-40
(3) Press HF SYNC pushbutton and release INT CH1 pushbutton. Adjust SCAN
control ccw until time markers stop drifting in one direction. The first point at which time
markers stop drifting, oscilloscope will display three time markers. If oscilloscope does not
display three time markers, perform b below.
b. Adjustments. Adjust R381 (fig. 1) until oscilloscope displays 3 time markers
drifting toward right on crt.
15. Lead Time and Register
a. Performance Check
(1) Position controls as listed in (a) through (e) below:
(a)
HF SYNC pushbutton released.
(b)
INT CH1 pushbutton pressed.
(c)
DELAY ZERO control fully ccw.
(d)
DELAY TIME MULT dial to 0.00.
DELAYING SWEEP and DELAYED SWEEP SEC/DIV switches to .2 S.
(e)
(2) Set oscilloscope calibrator markers output to 0.1 S.
(3) Adjust TRIGGERING LEVEL control for a stable crt display and alternately
press and release SWP pushbutton. If first narrow time marker does not align on 2d
vertical graticule line within 0.l divisions perform b below.
b. Adjustments
(1) Release SWP pushbutton and adjust R472 (fig. 1) until a marker is aligned on 2d
vertical graticule line.
(2) Press SWP pushbutton and adjust R230 (fig. 1) until first narrow time mark is
aligned on 2d vertical graticule line.
(3) Repeat a (3) and b (1) and (2) above for best compromise.
16. Delay Timing
a. Performance Check
(1) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to CH1 INPUT.
(2) Release SWP pushbutton. Oscilloscope will display two time markers per each
major graticule division within 0.3 division of each graticule line.
(3) Press SWP pushbutton for same results in (2) above.
(4) Release SWP pushbutton and set DELAYING SWEEP and DELAYED
SWEEP SEC/DIV switches to 1 S.
S and adjust TRIGGERING
(5) Set oscilloscope calibrator markers output to 1
LEVEL control for stable display.
(6) Set DELAY TIME MULT dial to 0.00 and turn DELAY ZERO control cw until
a time mark is centered on 2d vertical graticule line.
(7) Turn DELAY TIME MULT dial to 1.00. Peak of time mark will remain within
0.1 division of 2d graticule line.
