Tektronix 2235 Operator's Manual

SG LS WP RESET-Press i n t he sp ring-ret u rn bu t-

vi d ing

α

sta b le

d is p lay

of t h e

low-frequency
ton momentarily to arm t he Α Trigger circ u it for α

components of α complex waveform .
single-swee p d is p lay . In t h is mode, t h e trigge r sys-
temope r ates t he same as N O RM, excep t only o n e

LF REJ -Atte nuates tr igge r -sig n als below αρ -
swee p is d is p laye d for eac h trigger signal . Anot h er

p roximately 40kH z . T h is position is u sef u l for pro-
swee p ca n not b e d isplayed u ntil t he SG L S WP

vi d ing α stable d isplay of t he h ig h -fre q uency
RE SET button is momentarily pr essed i n again to

com ponen ts of α com p lex wavefo r m .
r eset t he Α T r igge r ci r cuit . T h is mo d e is u sef u l for
d is p layi n ga nd photograph ing eit h er nonrepetitive

35 Α ΕΧΤ CO UPL I N G Switc h -Determines t he met hod
signals or signals t h at cause unstable conventio n al

u sed to co u ple external
signals
to t
h
e Α T R IGG ER
dis p lays (e .g .,

sig n als t h at va r y i n am p litude,

ci
r
cuit
fr
om t he ΕΧΤ I
NPU T
connecto r .
sha p e, o r time) .
T R IG'D- RE ADY I nd
icato
r - LE D ill
u
minates w h
en
ei-
t h
er
Ρ - Ρ A
U
TO
or
N
O
RM Trigger
M ode is selected
and
t he Α
Swee p
h
as b een t
r igge r
e d (T R IG'D) .
In si
n
gle-swee p dis p lay, t
h
e
LE D ill
u
mi
n ates to in d i-
cate t h at t h e Α T r igge r ci r cuit is a r me d ( RE ADY) .
ΑT R IGG ERLEVEL Co n t r ol-Selects t h
e am
p
litude
p oint
on
t h
e
t r igger sig n
al at
w h
ic
h
t h e swee p is
triggere d .
S L O PE Switc h
-Selects
t h
e slo pe of t
h
e
sig n
al t h at
t r igge r s t he swee p .
OU T- Wh
e
n
button is
r
eleased out, swee p is trig-
ge
r
ed
f r
om t
h
e p ositive-goi n g slo pe of t h e trigger
sig n al .
ΕΧΤ I NPU T Co nn ecto r - P rovi des α means of intro-
ducing external
signals into t h
e
Α Trigger
ci
r
cuit
t h
roug
h t h
e
Α ΕΧΤ
CO
UPL I N
G switc
h .
IN-When button is p ressed in, sweep is tr igge r
ed
from t he n egative-goi ng slo pe of t h e trigger sig n al .

(37) ΒTR IGG ERLEVEL Cont r ol-Selects t h e amplit ud e
p oint οη t h e trigger signals at w h ic h t h e sweep ί s trig-
33 Α SO UR C E Switc h -Determines
t
h
e sou
r
ce of t he

ge r ed . Wh en fully cloc k wise ( Β RUN SAFT ER D LY),
t r igge r sig n al
cou p le d to
t h
e
i np
ut of t he Α Trigger

t he Β Swee p ci r c u it runs imme d iately followi ng t h e d e
ci r cuit .

lay time selecte d b y t he Α SE C/DI V an d t he ΒD ELAY
TIME P OSITIO N control .
ΙΝΤ - P ermits trigge r i ng
on
sig n
als
t h
at a
r
e a pp lied
to t he C H 1 OR Χa n d C H 2 O R Υ inp u t connec-
tors . T h e source of t he internal signal
is selected by
t h eTR IGG ERSOUR CE switc h
es .
L I NE -T he p owe r -sou r ce waveform is t he sou rce
of t he t r igge r sig n al . T h is trigger sou rce is usef u l
w hen vertical input signals are time related (multi-
p le or submultiple) to t he f r e q uency of t he p owe r-
input sou r ce voltage .
P repa r ation fo r U se-2235 ΑΝ / US M -488 Ope r ato r s
AC-Signals
ab ove 60 Hz are capacitively co u ple d
to
t h
e
input
of t
h
e
Α Trigger
circuit .
Any
do com
p
o-
n
ents a
r
e bloc
k
ed, and
signals
below 60 Hz a
r
e
atte n uate d .
DC-All
fre
qu ency
com p
onents
of t h
e
signal
are
cou p led to t he input of t he Α Trigger circuitry . T h is
p ositio n is useful for displayi n g
low-frequency or
low-repetition-rate signals .
DC- 10-External t
r igge r sig n
als a
r
e atte
n
uated
b y α factor of 10 . All
fre
qu ency com
p
onents of
t h
e
signal are cou ple d to t h e inp u t
of
t h
e
Α Trigger
ci
r
cuit
.
VA R H O L DO FF Control- P rovi d es contin u ous co n -
trol of h ol d off time b etween sweeps . Increases t h e
h oldoff time b y at least α facto r of 10 . T h
is co
n tr ol
i mp roves t he ab ility to t r igge r on ap eriodic sig n als
(s u ch as complex d igital waveforms) .
ΕΧΤ - P ermits trigge r ing
on
sig n
als a pp lied to t
h
e

RE A R P A NEL
ΕΧΤ I NPU T co nn ecto r .
Α TR IG BW Switc h -T h ree-section switc h t h
at se-
lects t he trigger band p ass fr eq uen
cies fo
r t h
e
Α T r ig-
ge r ci r cuit .
R efer to F igure 2-7 for locatio n of item 39 .
ΕΧΤ Z-AXIS Co nnecto r - Pr ovides α means of con-
necting exter n al sig n als to t h eΖ -Axis am p lifie r to in-
tensity mo du late t he crt . Ap p lie d sig n als d o not affect
FULL-All fre q uency com p one n ts are p
assed to

display waves h ape . Signals wit h fast rise times and
t h eΑ Trigger circuit .

fall times pr ovide t h e most ab r u p t i n te n sity chan ge,
an d α 5V ρ - ρ sig n al will pr oduce n oticeable modula-
HF REJ -Atten u ates trigger-signals ab ove αρ -

tion . T h eΖ -Axis signals m u st b e time-relate d to t he
p roximately 40 kH z . T h is position is u seful for p ro-

dis p lay to obtain α stable p resentation on t he crt .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English