
Performance Check/Calibration—Type 324
must coincide exactly with their respective graticule
lines (reposition the display slightly with the horizontal
POSITION control if necessary).
f.
Position the second marker to the second vertical
line.
g.
C H EC K —F o u rth marker w ithin 0.08 division
(within 4%) of the fourth vertical line.
h. Position the third marker to the third vertical line.
i.
CHECK—Fifth marker w ithin 0.08 division (within
4%) of the fifth vertical line.
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. 5-12A).
e. CHECK—Sweep length between 10.5 and 11 divi
sions as shown by 0.5 to 1.0 division of display to the
right of the tenth vertical line (see Fig. 5-12A).
f. ADJUST—Sweep Length adjustment, R347 (see
Fig. 5-12B), for a sweep length of 10.7 divisions (0.7
division of display to the right of the tenth vertical
line).
j.
Continue this check for each two-division portion
of the sweep w ithin the center eight divisions of the
graticule.
k. INTERACTION—Check steps 30 through 35.
30. Check Variable Time/Division Control Range
a.
Set the time-mark generator for 10-millisecond
markers.
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 verti
cal lines of the graticule with the horizontal POSITION
control.
d. Turn the VAR IABLE T IM E /D IV control fully
counterclockwise.
e. CHECK—CRT display for four-division maximum
spacing between markers (indicates adequate range for
continuously variable sweep rates between the calibrated
steps.)
31. Check/Adjust Sweep Length and
O
Centering
a. Return the VAR IABLE TIM E /D IV control to
CAL.
b.
Set the time-mark generator for one-millisecond
markers.
g.
Rotate the horizontal POSITION control fully
clockwise.
C206
R444
Horizontal Position
Center
C 330 F
C401
C402
C 470
Sweep length
range
*r-
R412
Ext Horiz Pos
I
*
R402
1
X 5 Gain 1
Point T
(Trigger
Compensation
Test point)
R347
Sweep Length
Tenth
vertical line
Eleventh
marker
Fig. 5-12. (A) Typical CRT display when checking sweep length,
(B) Location of horizontal adjustments (Horizontal board).