Tektronix CURVE-TRACER 576 Instruction Manual page 167

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m. Using the Type 576 horizontal POSITION switch,
position the trace on the zero vertical graticule line of the
CRT (see Fig. 1-4).
n. Check the geometry of the trace for minimum
bowing.
o. Position the trace to the tenth vertical graticule line
(see Fig.1-4).
p. Repeat part n.
q. Set the horizontal POSITION switch to its center
position.
r. Set the Calibration Fixture Step Gen Loads switch to
OFF.
s. Using the Type 576 vertical POSITION switch, posi-
tion the trace to the zero horizontal graticule line (see Fig.
1-4).
t. Repeat part n.
u. Position the trace to the tenth horizontal graticule
line.
v. Repeat part n.
w. ADJUST -R893, GEOMETRY adjustment on the
left of the instrument (see Fig. 1-3), for minimum bowing
of trace.
x. Position the trace to the center horizontal graticule
line.
y. Turn the Type 576 FOCUS control and the
VARIABLE COLLECTOR SUPPLY control fully counter-
clockwise and recheck the adjustment of astigmatism and
focus as in parts b through f.
Control Settings (Partial List)
INTENSITY
VERTICAL
DISPLAY OFFSET
Selector
ADD AUG 1984
Spot Visible
.5A
HORIZ X10
Adjustment-Type 576
5. Adjust Balance of Horizontal Display Amplifier
a. Set the Type 576 and Calibration Fixture controls as
shown in the list of Initial Control Settings at the beginning
of the procedure with changes as shown in the preceding
partial list.
b. Position the spot to the center of the graticule using
the FINE POSITION controls.
c. Set the DISPLAY OFFSET Selector switch to
HORIZX1.
d. Check for the spot on vertical centerline of the CRT
graticule.
e. ADJUST-R681, HORIZ CENT adjustment, on the
DISPLAY AMP circuit board (see Fig. 1-5) if the spot is not
centered.
f. Set the DISPLAY OFFSET selector switch to HORIZ
X 10 and repeat parts b through e until no movement of the
spot occurs between the two settings of the DISPLAY
OFFSET Selector switch.
g. Set the following Type 576 controls to:
DISPLAY OFFSET
Selector
HORIZONTAL
HORIZ X10
1 V COLLECTOR
h. Check for the spot horizontally centered on the CRT
graticule.
i. ADJUST-R650, 1'S BAL adjustment, on the
DISPLAY AMP circuit board (see Fig. 1-5) if the spot is not
centered.
j. Set the HORIZONTAL switch to .5 V COLLECTOR.
k. Check for the spot horizontally centered on the CRT
graticule.
I. ADJUST-R645, 5'S BAL adjustment, on the
DISPLAY AMP circuit board (see Fig. 1-5) if the spot is not
centered.
m. Set the HORIZONTAL switch to 2 V COLLECTOR
and re-check the adjustments made in parts a through I.
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