Tektronix 454A - Page 131

· zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA . Connect
t h e
BN
C 50 © i n- l i ne t er mi nat i on on t h e en d

‘ an d ’ T R I GG ER
I N
G SO UR
C E
swi t c
h
es t o
™• ¤
an
d t h
e
of t he 18- i nc h BN C ca b l e t o t he CH 1 i n p u t connect or .

CH 1 V
O
L
TS/ DI
V swi t c h t o 5 .
¿ . Set t he ‘ and ’ T R I GG ER
I N
G SO UR
C E
swi t c h es t o

c . Connect t he 10 § p r obe t i p t o ± l i ne- vol t age sour ce .
EXT .
Á . C HE CK - T h at ± st a b l e d i s p l ay can be obt ai ne d by
a d j u st i ng t he ‘ T R I GG ER
I N
G
LEVEL
an
d HF
STA B con-
t r ol s i n bot h t he + and - p osi t i ons of t he T R I GG ER I N
G
S L O PE swi t c h . R e p eat c h ec k f or eac h p osi t i on of t h e
TR I GG ER I NG CO UPL I N G swi t c h . ‘ st abl e d i s p l ay must
not be ob t ai na b l e i n t he HF REJ p osi t i on of t he T R I G-
G ER I N G CO UPL I NG swi t c h .
q . C HE CK - C R T d i s p l ay f or 0 . 2 d i vi si on or l ess of j i t t er .
f . C HE CK - R e p eat c h ec k st e p d . Tr i gger i ng,
+
an d -
r . Set t he ‘ T
R
I GG ER
I N
G SO UR C
E
swi t c h t o ™• ¤ an d

m u st b
e
possi bl e
i n al l p osi t i ons of t he TR I GG ER I NG
t h e CH 1 V O L TS/ DI V swi t c h t o 10 mV .

CO UPL I NG swi t c h exce p t LF REJ .
s . A d j u st t he ‘ T R I GG ER I N G LEVEL and HF STA B  g .
Set t he H O R I Z DI S PL AY swi t c h t o ’ ( D EL AY E D
cont r ol s f or as st abl e ± d i s p l ay as p ossi bl e .

S
WEEP) .
t . R emove t h
e G
R
50
©
i n- l i n e t er mi nat i on f r om t he ‘
• §¤ T R
I G
I NPU
T
connect or
an d r e- i nst al l i t on t h e ’ • §¤
TR I G I NPU T connect or .
Å . Set
t h
e
H
O
R
I Z
DI S
PL AY swi t c h t o ’ ( D EL AY ED
S
WEEP) an d t he
’ T
R
I GG ER
I N
G SO UR C E swi t c h t o
EXT .
½ . C HE C
K - T h at ± st abl e d i s p l ay can be obt ai ne d by
a d j u st i ng t
h
e
’ T R I GG ER I NG LEVEL a n d ‘ HF STA B
cont r ol s i n bot h t h
e + an d - p osi t i ons of t he T R I G-
G ER I NG SL O PE swi t c h . Re p eat c h ec k f or
eac
h p
osi t i on of
t he T R I GG ER I N G CO UPL I N G swi t c h . ‘ st a b l e d i s p l ay
must not be ob
t ai nabl e i n t he HF REJ p osi t i on of t h e
T R I GG ER I N
G CO
UPL
I NG swi t c h
.
É . C HE C K - C R
T
d
i s
p
l ay f or 0 . 2 d i vi si on or l ess of j i t t er .
Ç . Di sconnect al ™ t est e q u i p ment .
21 . C h ec k ‘ an d ’ 60 H z Tr i gger i ng
O p er at i on
h . C HE
CK - T h at ± st abl e di s p l ay can
be ob t ai ne d b y
a d j ust i ng t he ’
T
R
I GG ER I NG LEVEL cont r ol i n bot h
t he
+
an d - p osi t i ons of t h e T R
I GG ER I NG SL O PE swi t c h .
R epeat c h ec k f or eac h posi t i on
of t he T R I GG ER I NG
CO
UPL
I
N
G swi t c h . ‘ st a b l e d i s p l ay must not
be obt ai nabl e
i n t he LF REJ p
osi t i on of t he TR I GG ER I N G CO UPL I N
G
swi t c h .
k . Di sco nn ect al l t est e
qu i p ment .
P er f or mance C h ec k - 454 ‘ / R 454A
d . C HE CK - T h at ± st abl e d i s p l ay can be obt ai ne d by
ad j ust i ng t he ‘ T R I GG ER I N G LEVEL cont r ol i n b ot h t h e
+ an d - p osi t i ons of t h e TR I GG ER I N G SL O PE swi t c h .
R
e p
eat
c
h
ec
k f or
eac
h p
osi t i on of t he TR I GG ER I N G
CO UPL I NG swi t c h . ‘ st a b l e d i s p l ay m u st not be obt ai na b
l e
i n t h e LF REJ p osi t i on of t he T R I GG ER I NG CO UPL I N G
swi t c h .
e . Set t he ‘ T R
I GG
ER I N
G SOUR
CE
swi t c h t o L I NE .
i . Set t he ’ T R I GG ER I N G SOUR C E swi t c h
t o L I NE .
j . C HE CK - R e p eat c h
ec
k
st e p h . Tr i gger i ng,
+
an d -
m u st b e p ossi bl e i n
al l
p
osi t i ons of t he T R I GG ER I NG
CO UPL I NG swi t c h except LF REJ .
22 . C h
ec k ‘ an d ’ Sl o p e Swi t c h O p er at i on
± . Connect t h
e out p ut of l ow- f r equency si gnal gener at or
( Gener al R ad i o 1310- ‘ ) t o t h
e C H 1 i n p u t connect or
t h r oug h ± 42- i nc h 50 © BN C
cabl e .
±
.
Connect ± 10 § pr obe t o t h e CH 1 i n p ut connect or .

b . Set t h e H
O R I Z DI S PL AY swi t c h t o A,
t he
‘
an
d
’
¤™œ• / DI V swi t c h es t o 1 ms,
t
h
e ‘ an d ’ T R I GG ER I NG
SO UR C E swi t c h es t o ™• ¤ , t he ‘ an d
’ T R I GG ER I N G
b . Set t he H O R I Z DI S PL AY swi t c h t o ‘ , t h
e
‘
an
d
’

SL O PE swi t c h
es t o + an d t he ‘ an d ’ T R I GG ER I N
G
¤™œ• / DI V
swi t c h es t o 5 ms, t he M AG swi t c h t o O FF, t he

LEVEL cont r ol s t o 0 .
5- 1 7