Tektronix 2235 - Adj Ust V Ertical Gain; C Hec K in P Ut Cou P Ling

A dju stme n t P roce du re-2235 Service
h . AD
JU ST-C
h
1 MF / LF Comp (C3) and C h 1 MF / LF

V O L TS/DI V switc h . If trace
s
h ift
is ob served, repeat Ste p2
Gain ΒαΙ ( R 47) for t he best front corne r a nd flat to p .

of t h is p rocedu r e .
i .
Disconnect t h e test eq uipme n t from t he instr u me n t .

7 . C h ec k Deflectio n Acc ur
acy and
V
a r iable R an ge
6 . A dj
ust
V
ertical Gai n ( R 145, R 195, R 76, a n dR 26)

VER TICA L M
OD
E

C
H
1
α . Connect α 50-m V stan d ard-am p lit ude signal via α 50- Ω

AC-G N D-DC ( b ot h )

DC
cable to t h e C H 1 OR Χ in p ut connecto r .
b . Set t
h
e Α SE C/DI V switc h to 0 .2 ms .
c . AD JU ST-C h 1 Gain ( R 145) for an exact 5- d ivision
dis p lay .
e . AD JU ST-C h 2 Gain (11195) for an exact 5- d ivision
dis p lay .
f . C h ange t h e gen erator output to 10 mV and set b ot h
V
O L TS/DI V switc hes to 2 m V .
g . AD JU ST-C h 2 2-m V Gain ( R 76) for
an
exact 5- d ivi-
sion display .
h . M ove t he cab le from t he C H 2 OR Υ i n p ut conn ector to
t
h
e C H 1 O R Χ in p ut conn ector . Set t he VER TICA L M OD E
switc h to C H 1
.
i . AD JU ST-C h 1 2-m V Gain ( R 26) for an exact 5- d ivi-
sion dis p lay .

1 V
j . Set bot h AC-G N D-DC switc hes to G ND .

5 V
k .
C
HE
C
K
-T h at no trace sh ift occu r s w h e n switc h i ng
b etwee n t he
5
mV
and 2 m V positions of t he C H 1
V O L TS/DI V switc h . If
trace s
h ift
is observed , re p eat Step 2
of
t h
is p rocedu
r
e .
Ι .
Set t
h
e VER TICA L M OD E switc h to CH 2 .
α . Set :
b . C HE
C
K
-Deflection accuracy is wit h i n t he limits given
i n Table 5-3 for
eac
h
C
H 1 V
O
L
TS/DI V switc h setting a nd
corresponding stan d ard-amplitude
signal . Wh e n at t he 20-
m VV O L TS/DI V switc h setting, r
otate t h e C H 1 V O L TS/DI V
V aria b le control f u lly counte r cloc k wise
and C
HE
C K t h at t h e
dis p lay decreases to 2 divisions
or less . T hen r etur n t h e C H
1 V O L TS/DI V V aria b le control
to t
h
e CA L detent and con-
tinue wit h t h e 50-m V check .
d .
M
ove t
h
e cab le from t h e CH 1 O RΧ in p ut co n nector to
t h e C H 2 ORΥ i n p u t connector . Set t h e VER TICA L M OD E
switc
h
to CH2 .

Ta b
le
5-3
Deflectio
n
Accu
r
acy L imits
VO L TS/DI V Sta nd a rd V ertical
Acc ur acy
Switch Am p lit ud e Deflectio n L imits
Setti ng Sign al (Divisio n s) (Divisio n
s)
2 m V
5 m V
10 m V
20 m V
50 mV
0 .1 V
0 .2 V
0 .5 V
2 V
10 m V
5
20 m V 4
50 m V
5
0 .1 V

5
0 .2 V

Ι

4
0 .5 V

Ι

5
1 V
Ι 5
2 V
Ι
4
5 V
Ι
5
10 V
Ι
5
20 V

Ι

4
c . M ove t h
e ca b le from t he C H 1 O RΧ i npu t connector
to
t h
e
CH
2 O RΥ i np ut connecto r . Set t he VER TICA L M OD E
switc h to
C
H 2 .
d . R epeat part
b usi
n g
t
h
e C hann el 2 cont r ols .
m . C HE C K -T h at no tr ace sh ift occu r s w hen switc h i ng

8 .
Chec
k In p u t
Co up li n g
betwee
n
t
h
e 5 m V and 2 mV p ositio ns of t he C H 2

α . Set b ot h V
O
L
TS/DI V switc h es to 10 m V .
4 .90 to 5 .10
3 .92 to 4 .08
4 .90 to 5 .10
4 .90 to 5 .10
3 .92 to 4 .08
4 .90 to 5 .10
4 .90 to 5 .10
3 .92 to 4 .08
4
.90 to 5 .10
4
.90 to 5 .10
3
.92 to 4 .08