Tektronix 323, Instruction Manual

Page: 109 / 170

Calibration— Type 3 2 3
32. Adjust Normal Timing O
a. Change the following control settings:
TRIGGER + AUTO
X 10 HORIZ MAG Pushed in
b. Set the time-mark generator for one-millisecond mark­
ers.
c. CHECK— CRT display for one marker each division
between the second- and tenth-vertical lines of the grati­
cule (see Fig. 6-15A). Tenth marker must be within 0.24
division (within 3%) of the tenth vertical line with the second
marker positioned exactly to the second vertical line.
NOTE
Unless otherwise noted, use the middle eight h ori­
zontal divisions (between second and tenth ve rti­
cal lines o f the graticule) when checking or adjust­
ing tim ing.
d. ADJUST— XT Gain, R401 (see Fig. 6-15B), for one
marker each division. The second and tenth markers must
coincide exactly with their respective graticule lines (re­
position the display slightly with the horizontal POSITION
control if necessary).
,
Fig. 6 -1 5 . (A ) Typical CRT d is p la y show ing correct norm al tim ing ,
IB ) location o f norm al tim in g adjustm ent (M a in b o a rd ).
e. INTERACTION—Check steps 33 through 38.
33. Check Variable Time/Division Control
Range
a. Set the time-mark generator for 10-millisecond mark­
ers.
b. Set the TRIGGER control for a stable display in the
variable positive-slope area.
c. Position the markers to the far left and right vertical
lines of the graticule with the horizontal POSITION con­
trol.
d. Turn the VARIABLE TIME/DIV control fully counter­
clockwise.
e. CHECK— CRT display for four-division maximum spac­
ing between markers (indicates adequate range for con­
tinuously variable sweep rates between the calibrated steps).
34. Adjust Sweep Length O
a. Return the VARIABLE TIME/DIV control to CAL.
b. Set the time-mark generator for one-millisecond mark­
ers.
c. Adjust the TRIGGER control for a stable display in
the variable positive-slope area.
d. Move the eleventh marker (only part of first marker
may be visible) to the tenth vertical line with the horizontal
POSITION control (see Fig. 6-16A).
e. CHECK— Sweep length between 10.5 and 11 divisions
as shown by 0.5 to one division of display to the right of
the tenth vertical line (see Fig. 6-16A).
f. ADJUST— Sweep Length adjustment, R347 (see Fig.
6-16B), for a sweep length of 10.7 divisions (0.7 division of
display to the right of the tenth vertical line).
35. Adjust Magnified Timing O
a. Set the time-mark generator for 0.1-millisecond mark­
ers.
b. Change the following control settings:
TRIGGER Stable positive-slope
triggering
Horizontal POSITION Midrange
X I0 HORIZ MAG Pulled out
c. CHECK— CRT display for one marker each division
between the second and tenth vertical lines. Marker at the
tenth vertical line must be within 0.32 division (within 4%)
of that graticule line when the marker at the second verti­
cal line is positioned exactly.
d. ADJUST— X 1 0 Gain adjustment, R433 (see Fig. 6-16B),
for one marker each division. The second and tenth mark­
ers must coincide exactly with their respective graticule
lines (reposition the display slightly with the horizontal
POSITION control if necessary).
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