Adjust Horizontal - Tektronix CURVE-TRACER 576 Instruction Manual

Performance Check/Calibration-Type 576
f. Set the POLAR lTV switch to +(NPN) and repeat steps
b through e until 10 divisions of horizontal and vertical
deflection are obtained between the +(NPN) and -(PNP)
positions of the POLAR lTV switch.
g. Set the POLARITY switch to AC.
11. Adjust Horizontal and Vertical Magnifier
Gains
0
a. Set DISPLAY OFFSET Selector switch to HORIZ
X 10 and position the spot on the center vertical graticu le
line with the horizontal FINE POSITION control.
b. Switch the CENTERLINE VALUE switch between
the 4.5 and the 5.5 positions.
c. Check for the spot deflected 10 divisions horizontally,
when the CENTERLINE VALUE switch is switched for 4.5
to 5.5.
d. ADJUST -R673, HORIZ MAG GAIN adjustment, on
the DISPLAY AMP circuit board (see Fig. 5-2) if the spot
deflection is not correct.
e. Set the DISPLAY OFFSET Selector switch to VERT
X10 and the CENTERLINE VALUE switch to 5.
f. Position the spot on the center horizontal graticule
line with the vertical FINE POSITION control.
g. Switch the CENTERLINE VALUE switch between
the 4.5 and 5.5 positions.
h. Check for the spot deflected 10 divisions vertically
when the CENTERLINE VALUE switch is switched from
4.5 to 5.5.
i. ADJUST -R573, VERT MAG GAIN adjustment, on
the DISPLAY AMP circuit board (see Fig. 5-2) if the spot
deflection is not correct.
12. Adjust Horizontal Display Amplifier Gain
0
a. Set the following Type 576 controls to:
HORIZONTAL
DISPLAY OFFSET Selector
CENTERLINE VALUE
POLARITY
5-12
2 V COLLECTOR
HORIZ X10
10
+(NPN)
b. Press the ZERO button and position the spot verti-
cally to the zero horizontal graticule I ine and horizontally
to the center vertical graticule line using the FINE
POSITION controls. Release the ZERO button.
c. Press the Type 576 CAL button.
NOTE
Be sure that R512 has been properly adjusted in step
2 and the CAL button accuracy has been checked in
step 3, before making the adjustments in this step and
step 13.
d. Check for the spot centered horizontally on the CRT
graticule.
e. ADJUST -R636, 2'S GAIN adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
f. Release the CAL button and set the Type 576 HOR 1-
ZONTAL switch to 1 V COLLECTOR.
g. Repeat parts b, c and d.
h. ADJUST -R638, 1'S GAIN adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
i. Release the CAL button and set the Type 576 HOR 1-
ZONTAL switch to .5 V COLLECTOR.
j. Repeat parts b, c and d.
k. ADJUST -R641, 5'S GAIN adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 5-2) if the spot is not
centered.
I. Release the CAL button.
13. Adjust Vertical Display Amplifier Gain
a. Set the following Type 576 controls to:
VERTICAL .5A
DISPLAY OFFSET Selector VERT X10
0
b. Press the ZERO button and position the spot verti-
cally onto the center horizontal graticule line and hori-
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