Adjust Horizontal - Tektronix CURVE-TRACER 576 Instruction Manual

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e. ADJUST -R681, HORIZ CENT adjustment, on the
DISPLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
f. 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 DIS-
PLAY AMP circuit board (see Fig. 5-2) 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 DIS-
PLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
m. Set the HORIZONTAL switch to 2 V COLLECTOR
and recheck the adjustments made in parts b through I.
9. Adjust Balance of Vertical Display Amplifier
0
a. Set the DISPLAY OFFSET Selector switch to VERT
X 1 0 and position the spot to the center of the graticu le
using the FINE POSITION controls.
b. Set the DISPLAY OFFSET Selector switch to VERT
X1.
c. Check for the spot on the horizontal centerline of the
CRT graticule.
d. ADJUST -R581, VERT CENT adjustment, on the
DISPLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
®
Performance Check/Calibration-Type 576
e. Repeat parts a through d until no movement of the
spot occurs between the two settings of the DISPLAY
OFFSET Selector switch.
f. Set the following Type 576 controls to:
DISPLAY OFFSET Selector
VERTICAL
VERT X10
1 A
g. Check for the spot vertically centered on the CRT
graticule.
h. ADJUST -R550, 1 'S BAL adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
i. Set the VERTICAL switch to 2 A.
j. Check for the spot vertically centered on the CRT
graticule.
k. ADJUST -R545, 2'S BAL adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
I. Set the VERTICAL switch to .5 A and recheck the
adjustments made in parts a through k.
10. Adjust Horizontal and Vertical CRT Gain
0
a. Set the DISPLAY OFFSET Selector switch to NORM
(OFF) and the POLARITY switch to +(NPN).
b. Position the spot to the zero horizontal and vertical
CRT graticule lines (see Fig. 5-5) using the FINE POSI-
TION controls.
c. Set the POLARITY switch to -(PNP).
d. Check for the spot on tenth horizontal and vertical
CRT graticule lines ±0.1 division both horizontally and
vertically.
e. ADJUST -R692, HORIZ OUTPUT GAIN adjustment,
and R592, VERT OUTPUT GAIN adjustment, on a chassis
bracket on the operator's right of the instrument (see Fig.
5-2) to remove one half the error noted in part d.
5-11