Tektronix 454A - Page 25

ap p l i ed t o t h
e I
NPU
T CH 1 ORzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
§ con n ect or
pr ovi d es t he X- axi s
d
ef l ect i on and t h e si gnal ap p l i e d
t o
t h e I NPU T CH 2 or ¥
connect or pr ovi des t he Y- axi s
d ef l ect i on .
M
AG

I n cr eases sweep
r at e t o t en t i mes
set t i ng of
t he ‘ or ’ ¤™œ• / DI V
swi t c h by h or i zont al l y ex p an d i ng
t
h e cent er d i vi si on of t h e di s p l ay .
L i g h t i ndi cat es w hen magni f i er i s
on ( magni f i er i no p er at i ve
i n § - ¥
mo d e) .
‘ S WEEP
M
OD
E  Det er mi nes t
he oper at i ng mo d e f or
‘ sweep .
A U TO
T R I G : Sweep i ni t i at e d by
t h e a pp l i e d t r i gger si gnal
at poi nt
sel ect ed by t he
LEVEL / S L O PE
co n t r ol
w h en t he t r i gger si gnal
r e p
et i t i on r at e i s above a b out 30
h
er t z a nd wi t h i n t he f r e q uency
r a nge sel ect e d by t h e COU-
PLI NG swi t ch . Tr i gger e d
swee p
can be o b t ai n e d onl y
over t h e
ampl i t u d e r ange
of t h e a pp l i e d
t r i gger si g n al
.
Wh
en t h e LEVEL /
SL O PE
cont r ol i s out si de t h e
ampl i t u
d e r a n ge, t h e t r i gger
r e p et i t i on r at e i s bel ow t h e
l ower f r e q uency l i mi t ( or a b ove
up p er l i mi t f or AC HF REJ) , or
t h e t r i gger si gnal i s i na d e q uat e,
t h e swee p f r ee r uns at t h e swee p
r at e sel ect e d by t h e ¤™œ• / D 1 V
swi t c
h
t o pr o
d
uce
± r ef er ence
t r ace .
Oper at i ng I n st r uct i ons- 454 ‘ / R 454A
SI NG LE S
WEEP : Af t er ± swee p i s
d i s p l aye d , f ur t h er swee p s cannot
b e pr esent e d unt i l t h e RE S ET
b ut t on i s p r essed . Di s p l ay
i s
t r i gger ed as f or N O
RM o p er at i on
usi ng t h e ‘
Tr i gger i ng cont r ol s .
RE S E T
 Wh en t h e RE S E T but t on i s p r essed
( SI N G LE S WEEP mo d e) , ±
si ngl e
di s p l ay wi l l be p r esent e
d ( wi t h
cor r ect
t r i gger i ng) . Af t er t he sweep
i s com
p l et ed, t h e RE S E T but t on
must be
pr essed agai n b ef or e
anot h er swee p can be di spl ayed .
‘ S WEEP
LEN
GT
H

Ad j ust l engt h of ‘
swee p .
I n
t he
FULL p osi t i on ( cl oc k
wi se d et ent ) ,
t he swee p i s about
11 d i vi si ons
l ong . As t
h
i s
cont r ol i s r ot at ed
count er cl oc
k wi se, t h e l engt h of ‘
swee p i s r educe d un t i l i t i s l ess t h an
f our di vi si ons l ong j ust b ef or e t h
e
det e n t i n t h e f u l l y- cou n t er cl oc
k -
wi se posi t i on i s r eac h e
d . ™ · t h e ’
EN DS ‘ p
osi t i on ( count er cl oc k -
wi se d et ent ) ,
t h e ‘ swee p i s r eset at
t h e end
of t h e
’
sweep t o p r ovi d e
t h
e
f ast est
p ossi b l e swee p r e p et i t i on
r at e
f or d el aye d swee p si gnal s .
P OSI TI O N  Co
n t r ol s h or i zont al posi t i on of
t r ace .
F I NE

P r ovi des
mor e p r eci se h or i zont al
p osi t i o n ad j
ust ment .
1 V CA L
1 kH z

Cal i br at or out p ut connect or .
N
O
RM T R I G : Swee p i ni t i at ed b y

POW
ER ON

L i g h t :

I nd i cat es

t
h
at

P
O WER
t he appl i e d t r i gger si g n al at any

swi t c
h
i s on an
d t h e i nst r ument
p oi n t sel ect e d by t he LEVEL /

i s co nn ect e d t o ± l i ne- vol t age
S L O
PE cont r ol over t h e f r e-

so u r ce .
quency r ange sel ect e d b y t he
CO
UPL I NG swi t c h . Tr i gger ed
 Swi t c
h : Cont r ol s p ower t o t h e
sweep can be obt ai ned onl y over

i nst r ument .
t he am p l i t u d e r a n ge of t he
ap p l i e d t r i gger si gnal . Wh en t he

Si d e P anel
LEVEL / S L O PE cont r ol i s out -
si de t
h
e ampl i t ude r ange, t he

’ ¤™œ• / DI V

P
r ovi
d es cont i n u ousl y var i abl e ’
t r i gger r e p et i t i on r at e i s out si d e

V A R I A BLE

swee p r at e bet ween t he cal i br at e d
t he f r e q uency r ange sel ect e d by

swee p s sel ect e d by t he ’ TI ME/
t he CO UPL I N G swi t c h , or t he

DI V swi t c h . ’ swee p r at e i s
t r i gger si gnal i s i nadeq uat e, t h er e

cal i br at ed w
he
n co
n t r ol i s set f ul l y
i s no t r ace .

cl oc kwi se t o CA L .