Tektronix 2235 - Ad Ju St Channel; Ad Just 2;5 MV DC B Alance; Ad Just Channel 2 Invert B Alance

A dju stme n t Pr ocedu r e-2235 Service
2 .
A dj ust2/5 m V DC B ala
n
ce
( R 33 and R 83)

b . P osition t he trace on
t h
e
ce n te r h orizo n tal graticule
α .
Set t he CH 2 VO LTS/DI
V switc h to 5 m V .

line usi n g t h e C h annel 2
P OSITIO N control .
b .
P osition t h e trace on t
h
e
cen ter h orizontal graticule
line using t he C hann el 2 P OSITIO
N control .
c . Set
t he C H 2 V O L TS/DI V
switc h to 2 mV .
d .
AD
JU
ST-C h 2 2/5 m V Dc ΒαΙ ( R 83) to
set t he trace
on t he center
h orizontal graticule line .
e . R ep eat p arts α t hrough d u
n til t here is no trace sh ift
w hen ch anging t he C
H 2 V
O
LTS/DI V switc h from 5 m V to
2 mV .
f . Set
t h
e
VER TICA L M OD E switc
h
to
C H 1 .
g . R epeat
parts α t h roug h e for C h annel
1,
ad j
usting C h 1
2/5 m V Dc
ΒαΙ ( R 33) in p art d .
3 . Ad ju st
C ha nn el 1 V ariable
B
ala
n ce (1125)
α . Set
b ot h V O L TS/DI V switc
h
es
to 10 m V .
b . R otate
t h e C H 1 V O L TS/DI V
V
aria
b le control fully
countercloc
k wise .
c . P
osition t he trace on t he center
h orizo n tal graticule line
using t
h
e
C h annel 1 P OSITIO N control .
d . R otate
t he C H 1 V O L TS/DI V
V
aria
b le cont r ol cloc k -
wise to
t he CA L detent .
e . AD JU
ST-C h 1 V ar ΒαΙ ( R 25) to
set t he trace to t he
center
h orizontal graticule li ne .
f . Rep eat
p arts b t h roug h e until
t here is no trace sh ift
b etween
t he fully cloc kwise an d t he f u lly
countercloc kwise
p ositio
n
s of
t he C H 1 V O L TS/DI VV ariable
con t r ol .
g . R et u r n t he CH 1 VO L TS/DI
VV aria b le co n trol to t he
CA
L dete n t .
c . Set t he I NVER T b utton to On
( b utton in) .
d . AD JU ST-C h 2 Invert ΒαΙ
( R 75) to set t he trace to t he
center h orizo n tal graticule
line
.
e . Set t h e I NVER T b utton to
Off ( b utton ou t) .
f . R epeat parts b t hrough e
until t h ere is no trace sh ift
w hen switc h ing t he I NVER T b utton b etween
t h e On a nd Off
positions .
g . R ep eat Steps 2 and 3
for
C
h
an
n el 1 un til no f u rt h er
im p roveme n t is noted .
h .
R
ep
eat Steps 2 and 4 for C ha
n nel 2 un til no f u rt h er
imp roveme
n t is noted .
5 . Ad ju st
MF / LF Com p ensatio n a nd Gain
B alance
(C53,
R 97, C3, a nd R 47) .
α . Set :
VER TICA L M OD E

C H 2
V O L TS/DI V ( b ot
h )

10 m V
AC-G N D-DC ( b ot
h )

DC
Α S E C/DI V
20 ps
b . Connect
t he h ig h -am p litude s q uare wave o
u t p ut via α
50-
Ω
ca
b le, α 10 Χ attenuator, and α 50- Ω termination
to t he
C H 2 O
R Υ in p u t connector .
c . Set
t he generator to produce α 10-
kH z, 5-division
d is p lay .
d . Set t
h
e to p
of t he d is p lay on t h e center
h orizo n tal
graticule
line using t h e C h annel 2P OSITIO
N
cont
r
ol
.
e .
AD
JU
ST-C h 2 MF / LF Com p (C53) and C h 2 MF
/ LF
Gain ΒαΙ ( R
97)
for
t he b est front corner and flat top .
f . M ove
t h e cab le from t h e C H2 O RΥ in pu t
connector to
t he C
H 1 O RΧ in pu t con nector . Set t he
VER TICA L M OD E
switc h to C H 1 .
4
. Ad ju
st C h an n el 2 I nvert B alance
( R 75)

g .
Set
t he to p of t he display on t h e center
h orizontal
α . Set
t h e VER TICA L M OD E
switc h to CH2 .

graticule
line using t h e C han nel 1 P OSITIO
N control .
5-7