TB 9-4931-504-50
(2) Set time-mark generator to 10 mS markers output.
(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.
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 (1st dot) control fully ccw.
(d) DELAY TIME MULT (2nd dot) dial to 0.00.
(e) DELAYING SWEEP and DELAYED SWEEP SEC/DIV switches to .2 S.
(2) Set time-mark generator (A8) markers output to .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 aline on second
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 alined on
second vertical graticule line.
(2) Press SWP pushbutton and adjust R230 (fig. 1) until first narrow time mark is
alined on second vertical graticule line.
(3) Repeat a(3) and b(1) and (2) above for best compromise.
16. Delay Timing
a. Performance Check
(1) Connect time-mark generator (A8) to CH1 INPUT, using cable (B4).
(2) Release SWP pushbutton. Oscilloscope (A3) 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.
(5) Set time-mark generator MARKER OUT to 1 S and adjust TRIGGERING
LEVEL control for stable display.
(6) Set DELAY TIME MULT (2nd dot) dial to 0.00 and turn DELAY ZERO (1st
dot) control cw until a time mark is centered on second vertical graticule line.
