Tektronix 454A - Page 139

g . Set t h ezyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ‘
V
A R
cont r ol t o t h e det ent p osi t i on an d t h e

connect or s t h r o u g h t h e f i ve- nanosecond G R ca b l e, 50- o h m
‘ ¤™œ• / DI
V
swi t c h t o
2 ms ( l eave t h e ’ ¤™œ• / DI V swi t c h  i n- l i ne t er mi nat i on and t h e d u al - i n p ut cou p l er .
i
n t h
e
1
ms
p osi t i on) .
b . Set t h e C H 1
V
O L TS/ DI
V
swi t c h t o 10 m
V
an d t h e
h .

A
d j
ust
t h e

DELAY- TI ME

MUL TI PL I ER

d i al

t o

C H 2 V
O
L TS/ DI V swi t c h t o 20
m
V .
p osi t i on t h e t i me
mar k
er s t o t
h e l ef t an d r i g h t gr at i c u l e
l i nes .
i . Tur n
t h
e ’
¤™œ• / DI V V A R cont r ol
( on
i nst r u ment
si d e p
anel ) f u l l y co
u
nt er cl oc k wi se .
j . C HE C
K - C
R
T
d
i s p
l ay f or f o u r - d i vi si ons maxi m u
m
s p aci ng bet ween mar k er s ( i n d i cat es ade qu at e r ange f or
cont i nuo u sl y var i abl e swee p r at e bet ween cal i br at e d st e p s) .
UN CA L ‘ O R ’ l i g h t m u st b e on w h en ’ ¤™œ• / DI V V A R
cont r ol i s not i n t h e det ent p osi t i on .
k . Di sconnect
al l t est
e
q ui p ment
.
35 . C h ec k § Gai n
± . Set t h e C H 1 an d CH 2 VO L TS/ DI V swi t c h es t o 20
m
V ,
t h e
H
O R I Z DI S
PL
AY swi t c
h t o § - ¥
an
d
t h e ™• ¤
T R I G swi t c h t o C H 1 O NL Y O R § - Y .
h . C HE C K - C R T d i s p l ay f or an op eni ng at t h e cent er
b . Connect t h e st an d ar d am p l i t ude cal i br at or

h or i zont al l i ne
of 0
. 52
d i vi si on or l ess ( 3 ° or l ess p h ase
( 067- 0502- 01) t o t
h
e
C H 1
O
R § connect or vi a ± 42- i nc h

s h i f t ) .
50 © BN C cabl e .
c . Set t h e st an d ar d ampl i t u d e cal i b r at or f or ± 0 . 1- vol t
s q uar e- wave out put .
d . I ncr ease t h e I N T EN SI TY cont r ol set t i ng u nt i l t h e di s-
pl ay ( t wo d ot s abo u t f i ve d i vi si ons a p ar t ) i s vi si bl e .
e . M ove t h e di s p l ay t o t h e cent er of t h e gr at i c u l e wi t h
t h e C H 1 P OSI TI O N cont r ol .
f . C HE C K - C R T d i s p l ay f or f i ve d i vi si ons h or i zont al
d ef l ect i on .
g . I f necessar y, a d j u st t h e § - GAI N ad j ust ment ( on
si d
e
p anel ) f or exact l y f i ve d i vi si ons h or i zont al d ef l ect i on .
h .
Di sconnect al l t est eq u i p ment .
36 . C h ec k § - ¥ Ph
asi ng
P er f or ma n ce C
h
ec
k
- 454 ‘ / R 454A
c . Set t h e me d i u m- f r e qu ency gener at or f or ± 10- d i vi si o n
h or i zont al d i s p l ay at t wo mega h er t z .
d . Cent er t h e d i s p l ay ver t i cal l y an d h or i zont al l y wi t h t h e
C H 1 an d CH 2 P OSI TI O N cont r ol s .
e . C HE C K - C R T d i spl ay f or an o p eni ng at t h e cent er
h or i zont al l i ne of 0 . 52 d i vi si on or l ess ( 3 ° or l ess ph ase
s h i f t ; see F i g . 5- 2) .
f . Set t h e me d i u m- f r e qu ency gener at or f or
± 10
d
i vi si on
h or i zont al d i s p l ay at one mega h er t z .
g . I f necessar y, r ecent er t h e d i s p l ay wi t h t h e C H 1 an d
CH 2 P
OSI TI O
N cont r ol .
i
.
Set t h
e
const ant - am p l i t u d e gener at or f or ± 10- di vi si on
h or i zont al d i s p
l ay
at
0 . 5 mega h er t z .
j . I f necessar y, r ecent er t h e di s p l ay wi t h t h e C H 1 and
C H 2 P OSI TI O N cont r ol s .
0 . 52 d i vi si on
or l ess
± . Connect t h e me d i u m- f r eq u ency const ant - am p l i t ude
si ne- wave gener at or t o t he I NPU T C H 1 an d I NPU T C H 2

F i g . 5- 2 . Typi cal C R T d i s p l ay w h en c h ec k i ng
§ - ¥ ph asi ng .
5- 25