Tektronix 454A User Manual

Oper at i ng I nst r uct i ons- 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
‘ / R 454A
St e p At t enuat or B al ance
To c h ec k t h e st e p at t enuat or bal a n ce of ei t h er c h annel ,
set t h e I n p ut Cou p l i n g swi t c h t o G N D an d set t
h
e ‘
S WEEP M OD E swi t c h t o A U TO T R I G t o p r ovi
d e ±
f r ee- r unni ng t r ace . C h ange
t h e V
O
L TS/ DI V sw i t c h f r om
10
m V t o 2 m V . I f t h e t r ace moves ver t i cal l y, ad j ust t h e
f r ont - p anel ST EP ‘ ¤¤• • B A L ad j ust ment as f ol l ows
( al l ow at l east 10 mi nut es war mu p bef or e p er f or mi ng t h i s
ad j ust ment ) .
1
.
W i t h t
h
e
I n p ut Cou p l i ng swi t c h set t o G N D and t h e
V O L TS/ DI V swi t c h set t o 10 m V , move t h e t r ace t o t h e
cent er h or i zont al l i ne of t h e gr at i cul e wi t h t he ver t i cal
P OSI TI O N cont r ol .
2 .
Set t h e
V
O L TS/ DI V swi t c h t o 2 m V an d ad j ust t h e
ST
EP ‘ ¤¤• •
B
A
L ad j ust ment t o r et ur n t he t r ace t o t h e
cent er h or i zo n t al l i ne .
3 . R ec h ec k st e p at t enuat or bal ance an
d r e p eat adj ust -
me n t u n t i l no t r ace s h i f t occur s
as t he V
O
L TS/ DI V swi t c h
i s c h ange d f r om 10 m V t o 2
m V .
Si gnal
Connect i ons
I n gener al , pr obes of f er t h e most conveni ent
means of
connect i n g ± si gnal t o t he i nput of t h
e
454A
.
The
Te k t r o n i x p r o b es ar e s
h i el d ed t o p r eve n t p i c k u p of
el ect r ost at i c i nt er f er ence
. ‘ 10 § at t enuat or p r obe of f er s ±
h i g h i n p ut
i m p ed ance an d al l ows t h e ci r cui t un d er t est t o
p er f or m ver y cl ose t o nor mal o p er at i ng co n di t i ons .
H owever , ± 10 § p r obe al so at t enuat es t h e i n p ut si gnal 10
t i mes . T h e Te k t r oni x ¡ 6045 F i el d E f f ect Tr ansi st or p r o b e
of f er s t h e same h i g h - i n p ut i mp edance as t h e 10 § p r obes .
H owever , i t i s par t i cul ar l y u sef ul si nce i t p r ovi
d
es
wi d e- ban d o p er at i on
w h i l e p r esent i ng
no
at t enuat i on ( 1 §
gai n) an d ± l ow i np ut ca p aci t ance . To obt ai n maxi mum
ban d wi d t h w h en usi ng t he p r o b es, obser ve t h e gr oun d i ng
consi d er at i o n s gi ven i n t h e p r o b e manual s . T he p r obe- t o-
co nn ect or ad a p t er s and t h e bayonet - gr oun d t i p p r ovi d es t h e
best f r eque n cy r es p
o n
se .
R emem b er t h at ± gr oun d st r ap
onl y ± f ew i n c h es i n l engt h can p r o
d
uce sever al
p
er cent of
r i ngi ng
w
h
en o
p
er at i ng
at t h
e h
i g
h er f r e q uency l i mi t of t h i s
syst em
( see F i g . 2- 8) . F i g . 2- 9 gr a ph i cal l y i l l ust r at es t h e
u sabl e f r e q uency r ange ( at u pp er - 3 d B p oi nt ) of var i ous
Te k t r oni x pr o b es w h en use d wi t h t h e
454
‘ ( f or d ef l ect i on
f act or s f r om 10 m V t o
5
V) . Onl y ±
f ew
of t
h
e avai l a
b
l e
p r o b es ar e
s
h
own
i n t h i s
c
h
ar t
.
See yo
u
r
Te
k t r o n i x, I nc
.
cat al og f or c h ar act er i st i cs and com p at i b i l i t y of ot h er p r o b es
f or t h i s syst em .
I n h i g h - f r equency a p pl i cat i ons r equi r i ng maxi mum
over al l bandwi d t h , u se coaxi al ca b l es t er mi nat ed at b ot h
en d s i n t h ei r c h ar act er i st i c i m p e d ance . To mai nt ai n t h e
h i g h - f r e q ue n cy c h ar act er i st i cs of t h e a p p l i e d si gnal , use
ONEMMMMMMM
NEOMMMMMEN
MEREMMI MI ME
ONEMEMENNE
MEMONEEI REM
ENO 0
F i g . 2- 8 . W avef or m d i st or t i o n p r o d u ced wi t h i n cor r ect p r o b e
gr o
u
n
d . ( ‘ ) F i ve- i nc h gr o u n d l ea d , ( ’ ) t h r ee- i n c h gr o und l ea d , ( C)
bayonet gr ou nd a d apt er .

Tektronix 454A Specifications

General

Brand	Tektronix
Model	454A
Category	Test Equipment
Language	English