Tektronix 324, Instruction Manual, Page: 95 / 163

Performance Check/Calibration—Type 324
c. A D J U S T -T R A C E R O TA TIO N adjustment, R592
(see Fig. 5-6B), so the baseline of the marker display is
parallel to the center horizontal line.
14. Check/Adjust CRT Geometry
O
a. Set the V O L T S /D IV switch to .1.
b. Position the baseline of the marker display below
the bottom of the graticule with the vertical POSITION
control.
c. CHECK—CRT display for curvature of vertical lines
(markers) within maximum deviation of 0.1 division
from straight line. Curvature can be most easily checked
by positioning the markers to the vertical graticule lines
with the horizontal POSITION control.
d. ADJUST—Geom adjustment, R593 (see Fig. 5-6B),
for minimum curvature of vertical lines.
e. Disconnect the time-mark generator.
f. Set the TR IG G E R control to +AUTO,
g. Position the trace to the top line of the graticule
with the vertical POSITION control.
h. CHECK—Deviation from straight line should not
exceed 0.1 division.
i. Position the trace to the bottom line of the grati­
cule with the vertical POSITION control.
j. CHECK-Deviation from straight line should not
exceed 0.1 division.
NOTE
ft may be necessary to compromise the setting of
R593 to provide acceptable displays both in part c
and parts g and i.
15. Check/Adjust Limit Centering
O
a. Set the V O L T S /D IV switch to 5 D IV CAL.
b. Position the bottom of the display to the first
graticule line below the center horizontal line.
c. Reduce the display to exactly two divisions with
the V A R IA B L E V O L T S /D IV control.
d. Position the top of the display to the top hori­
zontal line of the graticule.
e. CHECK—Compression (reduction in amplitude) not
to exceed 0.1 division.
f. Position the bottom of the display to the bottom
horizontal line of the graticule.
g. CHECK—Compression (reduction in amplitude) not
to exceed 0.1 division.
h. Return the display to the position which produces
the most compression of the display.
i. A D JU S T—Lim it Centering adjustment R123 (see
F ig . 5 - 6 B ) , fo r maximum display amplitude (least
compression). Compression or expansion should not ex­
ceed 0.1 division.
16. Check/Adjust X1 Vertical Gain
O
a. Change the following control settings:
V O L T S /D IV .01
V A R IA B L E V O L T S /D IV CAL
b. C o n n e c t th e s ta n d a rd a m p litu d e calibrator
(067-0502-01) output connector to the V E R T IN P U T
connector with the 42-inch BNC cable.
c. Set the standard amplitude calibrator for a 50-
millivolt square-wave output.
d. Center the display about the center horizontal line
with the vertical POSITION control.
e. C H EC K —CRT display for five divisions, ± 0 .1 5 divi­
sion, of deflection (within 3%).
PERFORMANCE CHECK ONLY
Adjustment accessible through cutout in bottom of
cabinet; can be adjusted as part of performance
check.
5-15