Tektronix CURVE-TRACER 576 Instruction Manual page 143

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d. Turn the vertical FINE POSITION control throughout
its range.
e. CHECK FOR-Spot movement ·at least 2.5 divisions
above and 2.5 divisions below the center horizontal grati-
cule line.
f. Press the ZERO button and center the spot on the
graticule using the FINE POSITION controls. Release the
ZERO button.
g. Set the POLARITY switch to +(NPN).
h. CHECK FOR-Spot located at the intersection of the
zero horizontal and vertical graticule lines ±0.1 division
(see Fig. 5-5).
i. Set the POLARITY switch to -(PNP).
j. CHECK FOR-Spot located at the intersection of the
tenth horizontal and vertical graticule lines ±0.1 division
(see Fig. 5-5).
k. Press the Type 576 DISPLAY INVERT button.
I. CHECK FOR-Spot located at the intersection of the
zero horizontal and vertical graticule lines.
m. Release the DISPLAY INVERT button and switch
the horizontal POSITION switch counterclockwise two
positions.
n. CHECK FOR-Spot movement 5 divisions to the left
±0.1 division each time the switch is moved one position.
o. Switch the vertical POSITION switch to both counter-
clockwise positions.
p. CHECK FOR-Spot movement 5 divisions down ±0.1
division each time the switch is moved one position.
q. Set the following Type 576 controls as listed:
POSITION (Horizontal
and Vertical
POLARITY
Centered
+(NPN)
Performance Check/Calibration-Type 576
r. Switch the horizontal POSITION switch to both
clockwise positions.
s. CHECK FOR-Spot movement 5 divisions to the right
±0.1 division each time the switch is moved one position.
t. Switch the vertical POSITION switch to both clock-
wise positions.
u. CHECK FOR-Spot movement 5 divisions up ±0.1
division each time the switch is moved one position.
16. Check Horizontal and Vertical Displayed Noise
a. Set the following Type 576 controls to:
POSITION (Horizontal and
Vertical)
DISPLAY OFFSET Selector
POLARITY
SERIES RESISTORS
Centered
HORIZ X10
AC
140
Q
b. Install the protective box on the Standard Test Fix-
ture and close the lid.
c. Turn the Type 576 MAX PEAK VOLTS switch
throughout its range. (Be sure the CENTER Ll N E VALUE
switch is set to 5.)
d. CHECK FOR-Horizontal width of spot no greater
than indicated in Table 5-6 for Horizontal Collector Volts,
for each position of the MAX PEAK VOLTS switch.
e. Set the HORIZONTAL switch to .05 BASE. Connect
a 1 MQ resistor between the base (B) and emitter (E) jacks
on the Standard Test Fixture (right hand set of jacks) and
set the LEFT-OFF-RIGHT switch to RIGHT.
f. Repeat parts c and d, using Horizontal Base Volts
values from Table 5-6.
g. Set the following Type 576 controls to:
HORIZONTAL
DISPLAY OFFSET Selector
POSITION (Vertical)
POLARITY
VARIABLE COLLECTOR
SUPPLY
200 COLLECTOR
NORM (OFF)
1 position clockwise
+ (NPN)
Fully clockwise
Set the LEFT-OFF-RIGHT switch to OFF and remove
the 1 MQ resistor.
h. Turn the Type 576 MAX PEAK VOLTS switch
throughout its range.
5-15