Tektronix OPTION 10 Service Supplement Manual page 25

464 and 466 Opt ion 1 0
NOTE
e . Set VERT MODE swit ches t o display CH 1 and set
t he CH 1 AC- GND - DC swit ch t o DC.
1 This is a nom inal value for t his adj ust m ent. It m ay be
reset t o obt ain correct CH 1 overall gain . C
f . Move t he input signal from t he CH 2 input connect or
t o t he CH 1 input connect or .
0. Rem ove 1 0X probes from TP351 9 and TP331 9 .
1
g . CHECK- display is 4 divisions wit hin 3 % ( 4 divisions
+0.1 2 division ) .
p . CHECK- display is 4 division wit h 3 % ( 4 divisions
1 0.1 2 division ) .
9. ADJUST - Out put Gain Adj ust R41 5 ( on t he Vert ical
Out put board ) for a 4 - division display .
a
C
h . Change CH 1 VOLTS/ DIV and calibrat ion generat or
set t ings as shown in Table Opt ion 1 0-3 and check
t hat deflect ion accuracy is wit hin 3 % for all VOLTS/
DIV set t ings list ed . .
r . Set CH 2 VOLTS/ DIV t o 5 m V and m ove t he input
signal from CH 1 input t o CH 2 input . Set t he VERT
MODE swit ches t o display CH 2 .
a
s . ADJUST- CH 2 Gain Adj ust ( R3882 ) for a 4 -division
display .
i . If bot h channels check wit hin 3 %, proceed t o St ep 1 4
( see Not e following part t of t his st ep ) because no
furt her vert ical gain calibrat ion is required . If a check
at any set t ing of t he VOLTS/ DIV swit ch falls out side
t he 3 % accuracy lim it s , a com plet e gain recalibrat ion
is required and part s j t hrough t of t his st ep should be
com plet ed .
n
t . Repeat part s e t hrough i t o recheck t he vert ical
deflect ion accuracy .
n n
j . Set CH 1 VOLTS/ DIV swit ch t o 5 m V and set t he
out put of t he calibrat ion generat or t o 20 m V.
NOTE
C
If a com plet e calibrat ion is desired , perform St eps
1 4, 1 5 , and 1 6 in your 464 or 466 Service Manual at
t his poi nt , t hen perform St ep 1 7 in t his procedure.
k . Set t he t est oscilloscope cont rols as follows :
Vert ical Mode
Invert
Volt s / Div ( bot h )
Triggering
A Trigger Source
Add
On ( but t on in )
.1 V ( wit h 1 0X probe )
Aut o ( free - running sweep )
Ext ( no signal applied )
1 7. Check / Adj ust
Low - Frequency Com pensat i on
a . Set :
C
1. Connect t wo 1 0X probes from t he t est oscilloscope
t o TP351 9 and TP331 9 on t he 464/ 466 Vert ical
Pream plifier board . Connect t he probe ground leads
t o chassis ground .
A TIME/ DIV
VERT MODE
AC-GND- DC ( bot h )
VOLTS/ DIV ( bot h )
A TRIGGER LEVEL
0.2 m s
CH 1
DC
5 m V
As needed for st able
display
n
m , CHECK- signal bet ween
TP351 9 and TP331 9 is
400 m V p - p ( 4 divisions ) .
b . Connect calibrat ion generat or fast - rise + out put t o
CH . 1 input via a 50 12 coaxial cable , 1 0X at t enuat or ,
and 50 1 2 bnc t erm inat ion .
.
C
c . Adj ust calibrat ion generat or t o m aint ain a 5 -division
display t hroughout st ep 1 7 .
n . ADJUST- CH 1 Gain Adj ust ( R 3482 ) for 400 m V p - p .
n
@
23
n