Tektronix 2235 - HORIZONTAL

O p erati n g I nst ru ctio n
s-2235 Service
2- 4
C H 1 O R Χ and C H 2 O R Υ
Co
nn
ecto r s- P rovi d e for

sweep . T h e switc h ing rate
is a pp roximately 500
a pp lication of external sig n als to th
e
i npu
tsof t h e ver-

kH z . T
h is mo d e is usef u l for viewing
b ot h Ch a nnel
tical deflection system o r for
an Χ - Υ dis p lay . In t he Χ -

1
and C h annel 2 input signals at
swee p spee d s
Υ
mode, t he sig n al con n
ected to t he C H 1

OR

f r
om 0 .5 ms p er division to 0 .5 s per divisio
n .
Χ
con
n
ector provides h orizontal
deflection, and t he
signal
connecte d to t he CH 2 O RΥ
connector pro-

TR
IG V I EW - P ress in and h ol d t h
is pus h butto n to
vides vertical d eflection .

dis p lay α sam p le of t he signal present in
t he Α Trig-
ger amplifier
(for all Α SOUR C E switc h
settings) .
All ot h
er signal dis p lays a r e removed w h
ile t he
T R IG
V I EW Pu sh butto n is h el d in .
In p ut Co u p ling (AC-G N
D-DC) Switch es- U sed
to se-
lect t he met h od of coupli ng inp
u t sig n als to t he vertical
deflection system .
BW L I M IT- Wh en p
ressed in, t h is pu
s h-bu tto n
switc h limits t h e b andwidt
h of t he vertical am p
lifier
AC-In pu t signal is capacitively
coup led to t he ver-

and

t he

Α

Trigger

system

to

a pp
roximately
tical amplifier . T h e do
compo nent of t h e i npu t sig-

20 MHz . Push button m u
st be p ressed α secon
d
ηαΙ is b loc ked . L ow-fre qu
ency limit (-3 Db p oi n t) is

time
to release it and r
egain full 100 MH z b and
app roximately 10 H z .

widt
h
operatio n . P rovi d
es α met hod for reducing
interfere n
ce from h ig h -fre qu
e
n
cy signals w h e n
G
N D-T
h e inp u t of t he vertical am p lifie
r is grou n d-

viewing
low-frequency signals
.
e d to provi de α zero (groun d ) r efe r en
ce-voltage dis-
play (does n ot ground t he i np
ut
sig
n al) . T h is switc h
15

P OSITIO N Co n trols- U se
d to vertically p ositio n t h e
p osition allows p r ech argi ng
t
h
e i np ut coupling

dis p lay on t h e crt . Wh en t h e
S
E
C/DI V switc h is set to
capacitor .

Χ - Υ ,
t h e C h a nn el 2 P OSITIO N
cont
r
ol moves t he dis-
play vertically (Y-axis), and t h e H
o
r izo
n tal P OSITIO N
DC-All freq uency com ponents
of t
h
e input sig n al

control moves t he display h o r izo n tally
(X-axis) .
are couple d to t h e vertical deflectio n
system .
16 G N D
Connecto r - P rovides direct
connection to t he
13 I NVER T
Switch -Inve r ts t h e C h annel 2 d
isplay w hen

instrument
c
h
assis ground .
button is p
resse d in . Pu sh butto n must be p
resse d in
α seco nd time
to release it and r egain α n
oninverted
dis p lay .

17

S ER IA L
and M od Slots-T he S ER IA L
slot is imp rint-
ed wit h t h
e
i n
strument's serial n um b er . T h
e
M
od slot
contai ns
any op tion number t h at is i n stalle
d i n t he
14 VER TICA L M
OD E Switches-Two t h ree- p osition

inst ru ment .
switc h es a n
d
two
push - bu tto n switc hes are u
sed to
select t he
mode of o p eration for t h e vertical am p lifier
system .
H
O R IZO NTA L
C H
1-Selects only t he C han nel 1 in p ut sig n
al
for
dis p lay .

R efer to F
igure 2-5 for location of items 18 t hr
oug h 24 .
BOTH-Selects b ot h
C
h
a nn el 1 and C h annel 2 in-

18 Α
and Β SE C/DI V Switch es- U
sed to select t h e
p u t signals for d
is p lay .
T
he BOTH p ositio n must be

sweep speeds fo r t he Α an dΒ Swee p
Generato r in α
selected for eit h
er ADD, AL T, o r CH O P O p eratio n .

1-2-5
seq uence . To ob tain cali b rate d
sweep s p eeds,
t h
e
Α
and Β S E C/DI VV a r iable con trol m
u st be in t he
C H 2-Selects
only t
h
e C han nel 2 in p ut sig n al fo r
cali b rated dete n t (fully cloc k wise) .
dis p lay .
Α
S
E
C/DI V -T he cali br ated swee p
sp eed is
ADD-Dis p
lays
t h
e algeb r aic s u m of t he C hann el 1

sh own
b etween t he two b lac k lines
on t
h
e clear
and C h annel 2 i np
ut
sig
n als .

plastic sk irt . T h is switc h also selects t h e
delay time
for
delayed-sweep o p eratio n w hen
use d in con-
AL T-Alter n ately dis p
lays C
h
an nel 1 and C hann el

jun ction
wit h t he Β D ELAY TIME P
OSITIO N
2 in p ut sig n als . T he Alteratio n
occurs du ri ng re-

co n tr ol .
trace at t he end of eac h swee p . T h
is mode is u seful
for viewing b ot h input s' ι gnals
at swee p s p eeds

ΒSE C/DI V -T h
e
Β
-Swee p s p eed is set by pu lling
f r om 0 .05 Ει s p er division
to
0 .2
ms p er divisio n .

out t h
e (D
L Y'D
S WEEP PULL) kn o b a nd rotati ng it
cloc kwise
to α setti ng op p osite t h e w h ite line
CH O P -T h e d isplay switc hes b etween
t he C h a n -

scribed
on
t h
e
k
no b . T he Β Swee p circuit is
use d
n
el 1

and C h annel 2 input sig n als
du
r i
n g t he

only fo r d
elayed-sweep ope r atio n .