Tektronix CURVE-TRACER 576 Instruction Manual page 177

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At various times throughout this procedure, a single
spot will be displayed on the CRT. When displaying a
single spot, reduce the intensity as much as possible
while still maintaining visibility, to prevent burning of
the CRT phosphor.
j. Turn the FOCUS control throughout its range.
k. CHECK FOR-Spot in focus in the center range of
the control.
I.
Set the FOCUS control for the smallest possible spot.
DISPLAY AMPLIFIERS
2. Check Horizontal and Vertical Positioning and
INVERT Button
a. Turn the horizontal FINE POSITION control
throughout its range.
b. CHECK FOR-Spot moving at least ±2.5 divisions
horizontally about the center vertical graticule line (see Fig.
1-4 in Section 1 of this booklet).
c. Turn the vertical FINE POSITION control through·
out its range.
d. CHECK FOR-Spot moving at least ±2.5 divisions
vertically about the center horizontal graticule line.
e. Press ZERO button and center the spot on the grati·
cule using the FINE POSITION controls.
f. Set the POLARITY switch to +(NPN).
g. CHECK FOR-Spot located at the intersection of the
zero horizontal and vertical graticule lines ±0.1 division.
h. Set the POLARITY switch to -(PNP).
i. CHECK FOR-Spot located at the intersection of the
tenth horizontal and vertical graticule lines ±0.1 division.
j. Press the Type 576 DISPLAY INVERT button.
ADD AUG 1984
Performance Check-Type 576
k. CHECK FOR-Spot located at the intersection of the
zero horizontal and vertical graticule lines.
I. Release the DISPLAY INVERT button and switch the
horizontal POSITION switch to both counterclockwise
positions.
m. CHECK FOR-Spot moving 5 divisions to the left
±0.1 division each time the switch is switched one position.
n. Switch the vertical POSIT ION switch to both
counterclockwise positions.
o. CHECK FOR-Spot moving 5 divisions down ±0.1
division each time the switch is switched one position.
p. Set the following Type 576 controls as listed:
POSITION (Horizontal and
Vertical)
POLARITY
Centered
+(NPN)
q. Switch the horizontal POSITION switch to both
clockwise positions.
r. CHECK FOR-Spot moving 5 divisions to the right
±0.1 division each time the switch is switched one position.
s. Switch the vertical POSITION switch to both clock-
wise positions.
t. CHECK FOR-Spot moving 5 divisions up ±0.1
division each time the switch is switched one position.
3. Check Display Offset and Cal Button
a. Set the following Type 576 controls as listed:
DISPLAY OFFSET Selector HORIZ X10
POSITION (Horiz. and Vert.) Centered
b. Set the Calibration Fixture Function switch to Horiz
Ampl Cal.
c. Press the ZERO button and center the spot horizon-
tally on the CRT graticule. Release the ZERO button.
A-19