Tektronix CURVE-TRACER 576 Instruction Manual page 148

Performance Check/Calibration-Type 576
i--r-.--r-.--r-,--.~--r-,--.--~
~--r-4-~-4--r-4-~~~L_J_~
'
: Adjust
for
'
r-4-~-4--r-....;.._
crossover lines
:
l-4-~-4--r--+-
together but
~! -H--::~::::~:":O:.::k-:~· ~"'"•'"'
1--
:
f--~-4-~-4--r-4-~~--~4-~
'
!--J-+-~-4--l-4-~-4--r-4-~--;
l-4-~~--~+-~~--~4-~--·
'
'
•••
H
0
A
I
z
...
s
T
E
p
~
00
9m
...
oov
500
mv
2
v
Fig. 5-8. Type 576 display of crossover lines for adjusting ZERO
CROSS adjustment R8.
VARIABLE COLLECTOR
Fully clockwise
.05
v
1
SUPPLY
AMPLITUDE
NUMBER OF STEPS
OFFSET MU L T
STEP FAMILY
10.00 (fully clockwise)
REP
STEP GENERATOR
20. Adjust Zero Crossing and Step Delay
0
a. Set the Type 576 controls as shown in the list of
Initial Control Settings except as shown above.
b. Position the crossover point of the two traces to the
center of the CRT graticule using the horizontal FINE
POSITION controls.
c. Check that the crossover lines are together at center
(see Fig. 5-8). (Display may be inverted from that shown in
Fig. 5-8.)
d. ADJUST -RB, ZERO CROSS adjustment, on the
STEP GEN circuit board (see Fig. 5-7) if the display is not
correct.
e. Set the following Type 576 controls to:
POLARITY
NUMBER OF STEPS
RATE
+(NPN)
3
2X
f. Turn the CENTERLINE VALUE switch clockwise
until the peaks of the Collector Supply output are dis-
played on the CRT (see Fig. 5-9A).
5-20
r-~-.-.,-~~-.-.,-.--r-,·-·
:(B) :
t - - - - 4
'
'
'
I
~4-~-4--r-~-+-4--+-4--1--~
:--l-4--+~--+-4--+~--+-4--1
I
[ __ ~~-+~--+-~-+~--+-,__,
'
H+++'
t-4++-t+-+++++t--+fo-t-+4+-+++l++++t-+i+t-t<......,_
I
I
I
I '
~~-+--~4-~-4--~~~-4--1--~
I"'
...
H
0
A
I
z
s
T
E
p
~
o•
9m
PER
v
E
R
T
oov
•••
H
500
mv
2
v
~
500
~
mv
...
s
T
E
p
~
o•
9m
...
DIV
2
v
I
~·
I
I
I
I
I
I
I
Fig. 5-9. Type 576 display of Collector Supply peaks for adjusting '""·· • ;
I
DELAY adjustment R24: (A) incorrect adjustment; (B) correct
adjustment.
g. Check that the steps occur exactly at the peak of the
Collector Supply output (see Fig. 5-9B).
h. ADJUST -R24, DELAY adjustment, on the STEP
.GEN circuit board (see Fig. 5-7) if the steps do not occur at
the peak of the collector supply output.
21. Adjust Zero Step Level
0
a. Set the following Type 576 controls to:
CENTERLINE VALUE
HORIZONTAL
VARIABLE COLLECTOR
SUPPLY
STEP FAMILY
0
.05 V BASE
Fully Counterclockwise
SINGLE
b. Press the ZERO button and center the spot horizon-
tally on the graticule using the horizontal FINE POSITION
control.
c. Release the ZERO button.
®
I
I
I
I
I
I
I
~
I
I