Tektronix CURVE-TRACER 576 Instruction Manual page 141

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zontally onto the zero vertical graticule line using the FINE
POSITION controls. Release the ZERO button.
c. Press the CAL button.
d. Check for the spot vertically centered on the CRT
graticule.
e. ADJUST -R536, 5'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 VERTI-
CAL switch to .2 A.
g. Repeat parts b, c and d.
h. ADJUST -R538, 2'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 VER-
TICAL switch to .1 A.
j. Repeat parts b, c and d.
k. ADJUST -R541, 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.
14. Adjust Horizontal Compensation
NOTE
This is a factory adjustment and does not require
adjustment when doing a normal maintenance cali-
bration.
0
a. Install the transistor adapter (Tektronix Part No.
013-0098-00) on the Standard Test Fixture.
b. Install a NPN transistor, with a BVcEO of at least 50
volts, in one of the transistor sockets on the right side of
the adapter. Install the high voltage protective box on the
Standard Test Fixture.
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Performance Check/Calibration-Type 576
c. Set the following Type 576 controls as listed:
VERTICAL
1 mA
HORIZ X10
.5
DISPLAY OFFSET Selector
CENTERLINE VALUE
HORIZONTAL
MAX PEAK VOLTS
50 V COLLECTOR
75
MAX PEAK POWER WATTS
AMPLITUDE
PULSED STEPS
STEP FAMILY
LEFT-OFF-RIGHT
0.5
.05 ]lA
300 ]1s
REP
RIGHT
d. Turn the VARIABLE COLLECTOR SUPPLY control
and the AMPLITUDE switch clockwise until a display simi-
lar to Fig. 5-6A or B is obtained. Note that the horizontal
deflection factor for this setup is 5 V /division.
e. Remove the bottom screw from the high voltage pro-
tection shield on the HORIZ VOL TS/DIV circuit board.
Carefully swing the shield to the right, exposing C433.
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WARNING
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High voltage may appear on this capacitor. Use a non-
conducting tool to make this adjustment.
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Fig. 5-6. Display for adjusting HORIZ COMP adjustment: (A)
Incorrect display; (B) Correct display.
5-13