Tektronix 454A - Page 153

h . C HE C K - Test
osci l l osco p e d i s p l ay f or 3 d i vi si ons of

e . AD JU ST- C
H 1 VO L TS/ DI V swi t c h com p e n sat i on as
d ef l ect i on .

gi ven i n Tabl e
5- 5 . F i r st a dj u st f or opt i m u m s q uar e cor ner
on t h e d i s p l ay
and t h en f or opt i mum f l at t op . R emove t h e
15 p
F
i n p
u t R C nor mal i zer w h en a dj u st i ng f or o p t i mu m
i . AD JU ST- C h annel 1 GAI N a dj u st ment R 67 ( l ocat e d

sq
u ar e cor ner an d r e p l ace i t w h en a dj u st i ng f or o p t i mu m
on i nst r ument f r ont p anel ) f or
exact l y
3
d
i vi si ons
of d
e-

f l at t op . R ead j ust t h e gener at or o u t p u t wi t h eac h set t i ng of
f l ect i on i n t h e t est osci l l oscope d i s p l ay
.

t h e C H 1 VO L TS/ DI V swi t c h t o pr ovi de si x d i vi si ons of
def l ect i on . F i g . 5- 9 s h ows t h e l ocat i on of t h e var i a b l e
cap aci t or s .
j . C HE C K - C R T d i s p l ay of t h e
sco
p
e
un
d er cal i b r at i on
f or 5 d i vi si ons of d ef l ect i on .
k . AD JU ST- V er t i cal Gai n a dj u st ment
R
365 ( see
F
i g .
5- 8) f or exact l y 5 d i vi si ons of
def l ect i on . zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
™ . Set t h e V er t i cal M OD E swi t c h t o ADD .
10 m V
. 1
V
m . Set t h e C h annel 2 I NVER T swi t c h t o i t s o u t p osi -

1 V
t i on .
· . C HE C K - C R T d i s p l ay f or ± st r ai g h t l i ne .
¿ . AD JU ST- C h annel
2 GAI N AD JU
ST
MEN T R 167
( l ocat e
d
on
i nst r u ment f r ont p anel ) f or ± st r ai g h t l i ne .
18 . A d j ust C h annel 1 V O L TS/ DI V Swi t c h Com-
p ensat i on
± . Co n nect t h e sq u ar e- wave gener at or ( Ty p e 106) h i g h -
am p l i t u d e out p ut connect or t o t h e C H 1 i n p ut connect or
t h r o u g h t h e f i ve- nanosecon d GR cabl e, G R 50- o h m i n- l i ne
t er mi nat i on, an d t h e 15 p F i n p
ut
R C nor mal i zer ,
i n gi ven
or d er .
b . Set t h e V er t i cal M OD E swi t c h t o C H 1 an d t h e C H 1
VO L TS/ DI V swi t c h t o 10 m V / DI V .
c . Set t h e s qu ar e- wave gener at or f or si x d i vi si ons of one
k i l o h er t z si gnal .
CH
1 V
O
L TS/ DI V Swi t c h Compensat i on
C H 1 VO L TS/ DI V  Ad j ust f or O p t i mum
TA BLE 5- 5
Swi t c h Set t i ng

™

S q uar e Cor ner ' I

F l at Top
_C5 B
C6 B
' R emove t h e

15 pF i n p ut R C nor mal i zer w h en a dj ust i
n g f or
o p t i m u m squ ar e co
r ner .
19 . A d j ust C h annel 2 Vol t s/ Di vi si on Swi t c h
Com p ensat i on
± . Set t h e M
OD
E swi t c h t o C H 2 .
Á . Di sco n nect al l t est e qu i pment .
b . Connect t h e s qu ar e- wave gener at or h i g h - am p l i t u d e
o
u
t put
connect or t o
t h
e
I NPU
T C H
2
connect or t h r o u g h
q . R et u r n t h e I NVER T swi t c h t o t h e i n p osi t i o n .

t h e f i ve nanosecon d
G
R ca b l e,
G R 50- o h
m
i n- l i ne
t er mi na-
t i on an d 15 p F i nput R C nor mal i zer , i n gi ven or d er .
c . Set t h e s qu ar e- wave ge n er at or f or si x d i vi si ons of
one- k i l o h er t z si gnal
.
d . C HE C K - C R T d i s p l ay at eac h CH 1 VO L TS/ DI V
swi t c h set t i ng l i st e d i n Ta b l e 5- 5 f or opt i mum
s qu ar e cor ner
an d f l at t op wi t h l ess t h an 0 . 06 d i vi si on r ol l of f or
over
s h oot .

F i g . 5- 9 . L ocat i o n of compensat i on a d j u st ment s .
A d j ust ment - 454 ‘ / R 454A
C9
C5A
C6A
5- 39