Performance Check/Calibration—Type 422 AC-DC
R856
Y-Axis Align
Fig. 5-10. Location of Y Axis Align adjustment (rear panel).
12. Check/Adjust CRT Geometry
a. Set the horizontal POSITION and VARIABLE
TIME/DIV controls so a large marker coincides with each
graticule line.
b. CHECK—CRT display for 0.1 division or less bowing
of the markers at the left and right edges of the graticule.
Fig. 5-11 shows a typical display with good geometry as
well as examples of poor geometry.
c. ADJUST—Geom adjustment R854 (see Fig. 5-1 ID)
for minimum curvature of the markers at the left and right
edges of the graticule.
d. Recheck step 11 and readjust if necessary. If
readjustment is necessary, recheck this step also.
e. Disconnect the time-mark generator.
f. Position the trace to the top horizontal line of the
graticule.
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5-15
Fig. 5-11. (A)Typical CRT display of good geometry, (B) and (C) poor geometry, (D) location of Geom adjustment (left side).
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