TB 9-4931-504-50
13. Timing
a. Performance Check
(1) Position TI controls as listed in (a) through (e) below:
(a) CH1, INT CH1, SWP, +SLOPE, and REP pushbuttons pressed.
(b) CH1, VOLTS/DIV switch to .5 V.
(c) DELAYING SWEEP and DELAYED SWEEP SEC/DIV switches to 1 S.
(d) Adjust DELAY ZERO (1st dot) fully ccw and DELAY TIME MULT (2nd
dot) dial to 10.00.
(e) Press and release HF SYNC.
(2) Connect time-mark generator (A8) to CH1 INPUT, using cable (B4).
(3) Set time-mark generator to 1 S marker output.
(4) Adjust TRIGGERING LEVEL control for stable display.
(5) Adjust HORIZ POS (front panel) control to aline second marker with second
vertical graticule line.
(6) Adjust SWP CAL, (front panel) control to aline 10th marker with 10th vertical
graticule line. Readjust HORIZ POSITION control as necessary to keep second marker
aimed with second vertical graticule line. If one marker per division is not displayed
within .1 division over center 8 divisions, perform b(l) below.
NOTE
It may be necessary to reduce oscilloscope intensity before
performing (7) below.
(7) Adjust HORIZ POS to aline first dot on first graticule line. If second dot is
not alined on 11th graticule line, perform b(2) below.
(8) Release SWP pushbutton and set DELAY TIME MULT (2nd dot) fully ccw.
Adjust DELAY ZERO (1st dot) to aline a marker on second vertical graticule line. If
10th marker is not alined with 10th vertical graticule line, perform b(3) below.
b. Adjustments
(1) Adjust R132 (fig. 1) to aline one marker per each vertical graticule line (R).
(2) Adjust R130 and R131 (fig. 1) until first dot is alined on first graticule and
second dot is alined on 11th graticule (R).
NOTE
Due to interaction, R130 and R131 must be readjusted for
best compromise.
(3) Adjust R460 (fig. 1) to aline 1 marker per each vertical graticule line (R).
14. Scan Rate
a. Performance Check
(1) Connect time-mark generator (A8) to CH1 INPUT, using cable (B4).
