Tektronix 454A - Page 158

Ad j ust ment - 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ‘ / R 454A
Eq ui p ment R
e q
ui r e
d
1 . Ty p e 191 Const ant Ampl i t u d
e Si gnal Gener at or .

4 . 18- i nc h 50 © BN C cabl e .
2 . G R t o
BN C f emal e ad a p t er .

5 .
50
© BN C t er mi nat i on .
3 . 42- i nc h 50 © BN C cabl e .

6 . T h r ee- i nc h scr ew d r i ver
.
Cont r ol Set t i ngs
P r eset i nst r u ment cont r ol s t o t h e set t i ngs gi ven
un
d
er
P r el i mi nar y Cont r ol Set t i ngs .
23 . A d j ust CH 1
O U
T
DC L evel
± . Con nect t he CH 1 O U T connect or t o t he CH 2 i n p
ut
connect or wi t h an 18- i nc h BN C cabl e .
b . W i t h t he V er t i cal M OD E swi t c h set t o CH 1, p osi t i on
t he CH 1 t r ace t o t he cent er h or i zont al gr at i cul e l i ne wi t h
t he CH 1
P
OSI TI ON cont r ol .
c . Set t he V er t i cal M OD E swi t c h t o CH 2 an d t he CH 2
I n put Coupl i ng sw i t ch t o GND .

F i g .
5- 13
.
L ocat i o
n
of C
H 1
out put DC
l evel a d j u st m e n t ( ver t i cal
Pr eamp ci r cui t b oa r d
) .
d . P osi t i on t h e C H 2 t r ace t o t he cent er h or i zont al gr at i -
cul e l i ne wi t
h
t he C H 2
P
OSI TI O N cont r ol .
e .
Set t h e C H 2 I n p ut Co u p l i ng swi t c h t o DC .
f . C HE C K - C RT d i s p l ay f or t r ace wi t h i n 1 . 5 d i vi si o n s of
t h e cent er h or i zont al gr at i c u l e l i ne .
g . AD JU ST- C H 1 Out p ut DC
L evel ad j ust ment R 52
( see F i g . 5- 13) t o
p osi t i on t h e t r ace t o t h e cent er h or i zont al
gr at i c u l e l i ne .
h . Di sconnect t h e 18- i nc h BN C cabl e f r om
b
et ween t he
CH 2 I n p ut connect or an d t h e C H 1 O
U
T co
n nect or .
24 . A d j ust ‘ and ’ Tr i gger
L evel Ce n t er i ng
5-
44
T RI GG ER I NG AD JU ST MEN T
t h r oug h ± GR t o BN C f emal e ad a p t er , ± 42- i nc h 50 © BN C
cab l e an d ± BN C 50 © t er mi nat i on .
b . Set t he V er t i cal M OD E swi t c h t o CH 1 .
c . W i t h t he CH 1 VO L TS/ DI V swi t c h set t o 50 m V,
ad j u st t he out p ut of t he me d i u m- f r e q uency const ant -
am p l i t u
d
e gener at or
f or
± 0
. 3-
d
i vi si on d
i s p l ay at 50 k i l o-
h er t z .
d . B e s u
r e
t he ‘ LEVEL cont r ol i s set t o 0 .
e . C HE CK - St a b l e C R T d i s p l ay .
f . AD JU ST- ‘ Tr i gger L evel Cent er i ng ad j ust ment R 643
( see
F
i g . 5- 14) f or ± st abl e di s p l ay .
± . Connect t h e me
d i um- f r e qu ency const a n t - am p l i t ud e

9 . C h ange t he
H
O
R I Z DI S PL AY swi t c h t o ’
si gnal gener at or
( Ty p e 191) t o t he CH 1 I n p u t connect or

( D EL AY
E
D S
WEEP) .