Performance Check/Calibration-Type 422 AC-DC
Fig. 5-24. Typical CRT display when checking sweep length.
43. Check Sweep Length
a. Position the tenth marker to the center vertical line
with the horizontal POSITION control (see Fig 5-24).
b. CHECK—Sweep length between 10.4 and 12.1 divi
sions as shown by 0.4 to 2.1 divisions of display to the right
of the center vertical line (see Fig. 5-24).
44. Check Magnified Timing
a. Set the time-mark generator for 50-microsecond mar
kers.
Fig. 5-23. (A) Typical CRT display showing correct sweep
calibration, (B) location of Sweep Cal adjustment (Horizontal
Amplifier board).
d. ADJUST—Sweep Cal adjustment R512 (see Fig.
5-23B) for one marker each division. The second and tenth
markers must coincide exactly with their respective grati
cule lines (reposition the display slightly with the horizon
tal POSITION control if necessary).
e. Position the second marker to the second vertical
line.
b. Change the following control settings:
X10MAG Pulled out
Horizontal POSITION Midrange
c. CHECK—CRT display for one marker each division
between the second and tenth vertical lines. Marker at tenth
vertical line must be within 0.4 division (within 5%) of that
graticule line when the marker at the second vertical line is
positioned exactly.
d. Position the first 10-division portion of the total mag
nified sweep onto the viewing area with the horizontal
POSITION control.
f. CHECK—Fourth marker within 0.08 division (within
4%) of the fourth vertical line.
g. Position the third marker to the third vertical line.
h. CHECK—Fifth marker within 0.08 division (within
4%) of the fourth vertical line.
i. Continue this check for each two-division portion of
the sweep within the center eight divisions of the graticule.
j. INTERACTION—Check steps43 through 53.
e. CHECK—One marker each division between the sec
ond and tenth vertical lines. Marker at the tenth vertical
line must be within 0.4 division (within 5%) of that grati
cule line when the marker at the second vertical line is
positioned exactly
f. Repeat this check for each 10-division portion of the
total magnified sweep length.
g. Set the horizontal POSITION control to midrange.
h. Position a marker to the second vertical line
5-30
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