Tektronix CURVE-TRACER 576 Instruction Manual page 169

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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. 1-5) if the spot
deflection is not correct.
9. Adjust Horizontal Display Amplifier Gains
a. Set the following Type 576 controls to:
HORIZONTAL
DISPLAY OFFSET
Selector
CENTERLINE VALUE
POLARITY
2 V COLLECTOR
HORIZ X10
10
+(NPN)
b. Set the Calibration Fixture FUNCTION switch to
HORIZ AMPL CAL and the Display Offset Multiplier
switch to 10.
c. Press the ZERO button and center the spot horizon-
tally on the CRT graticule using the horizontal FINE
POSITION control. Release the ZERO button.
NOTE
Before making an adjustment in this step and the
following one, always press the ZERO button and be
sure the spot is horizontally centered (step 9) or ver-
tically centered (step 10) on the CRT as illustrated in
part c of this step.
d. Check for spot centered horizontally on the CRT
graticule.
e. ADJUST -R636, 2'S GAIN adjustment, on the
DISPLAY AMP circuit board (see Fig. 1-5) if the spot is not
centered.
f. Press the Type 576 CAL button and check for the
spot centered horizontally (on the tenth horizontal grati-
cule line).
g. ADJUST -R512, CAL adjustment, (see Fig. 1-5) if
the spot is not centered.
h. Release the Type 576 CAL button and set the HORI-
ZONTAL switch to 1 V COLLECTOR.
ADD AUG 1984
Adjustment-Type 576
i. Set the Calibration Fixture Calibrator Range switch to
100 mV.
j. Check for spot horizontally centered on the graticule.
k. ADJUST -R638, 1'S GAIN adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 1-5) if the spot is not
centered.
I. Press the CAL button and check that the spot is still
horizontally centered.
2
m. Release the CAL button and set the HORIZONTAL
switch to .5 V COLLECTOR.
n. Set the Calibration Fixture Calibrator Range to 50
mV.
o. Check for spot horizontally centered on the graticule.
p. ADJUST -R641, 5'S GAIN adjustment, on the DIS-
PLAY AMP circuit board (see Fig. 1-5) if the spot is not
centered.
q. Press the CAL button and check that the spot is still
horizontally centered _2
10. Adjust Vertical Display Amplifier Gains
a. Set the following Type 576 controls to:
VERTICAL
DISPLAY OFFSET
Selector
.5A
VERT X10
b. Set the following Calibration Fixture controls to:
Function
Calibration Range
Vert Ampl Cal
125 mV
c. Press the ZERO button and position the spot ver-
tically onto the center horizontal graticule line using the
vertical FINE POSITION control. Release the ZERO
button.
d. Check for spot vertically centered on the CRT grat-
icule.
2
1f the spot is not horizontally centered on the CRT graticule, R512
is out of adjustment or the calibrator divider is out of tolerance.
A-11