Tektronix 454A - Page 142

P er f or mance
C
h
ec
k
- 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ‘ / R 454A
h .
Di sconnect al l t est e q ui p
ment .

b . Connect t h
e ‘ + GAT E connect or ( on t he i nst r u ment
si d
e panel ) t o t h e t est - osci l l osco p e i n p u t connect or t h
r o ug h
± 42- i nc h 50 © BN C
cabl e .
i .
CA L I BRATI O N - See st e
p 2 of A d j ust ment p
r oce
d
u r e .
41 . C h
ec k Cur r ent t h r oug
h Cur r ent P r obe
Cal
L oop
± . Connect t h
e c u r r ent - meas u r i ng p
r obe an d p assi ve
t er mi nat i on t o t he I NPU
T CH 1 connect or .
b .
Set t h e p assi ve t er mi n
at i on f or ± sensi t i vi t y
of 2
mA/ m V .
c . Cl i p t he cu
r r ent - measur i ng p r obe ar o
u
n
d t he C UR-
REN T PR O BE CA L l oop .
d .
Set t he CH 1 VO L TS/ DI V swi t c h
t o
5
m
V ,
t h e ‘
T R I GG ER I N
G SOUR C E swi t c h t o ™• ¤ an d t he
‘ and ’
¤™œ• / DI V swi t c h es t o . 5
ms .
f . C HE CK - Test osci l l osco p e d i s p l ay
f or si x d i vi si ons of
ver t i cal d ef l ect i on wi t h t he bot t om of t h e wavef or m
near
- -
e . C
HE CK - C R T d i s p l ay 0 . 5 d i vi si on i n am p l i t ud
e ( f i ve

vol t s . Gat e d ur at i on s h o u l d be about 5 . 5 d i vi si ons
mi l l i am p er es) .
( abo u t 11 t i mes t he ’ ¤™œ• / DI V swi t c h set t i ng) .
T h i s st ep c h ec k s f or t he pr esence of cur r ent
i n t h e
C URREN T PR O BE CA L l oop . T h i s cur r ent
wi l l
r emai n wi t h i n t h e st at ed 1 % accur acy due t o
t
h
e
t ol er ance
of t h e di vi der r esi st or s an d t ol er ance of t he
cal i br at or out put
vol t age . I f i t i s necessar y t o ver i f y
t h e accu r acy of t h e cal i b r at or cur r ent ,
use ± cur r ent
measur i ng met er wi t h an accur acy of
at l east 0 . 25% .
f .
Di sconnect al l t est eq ui p ment .
42 . C h ec k ‘ an d ’
+
Gat e
Out p
ut Si gnal s
c . Set t he
t est - osci l l osco pe f or ± ver t i cal d ef l ect i on f act or
of 2 vol t s/ d i vi si on at ± sweep r at e
of t wo mi l l i seconds/
d i vi si on .
d . C HE
C
K
- Test osci l l osco p e d i s p l ay f or abo u t si x di vi -
si ons of ver t i cal d
ef l ect i on wi t h t he b ot t om of t h e wave-
f or m near zer o vol t s . Gat e
dur at i on s h o u l d be abo u t 5 . 5
d i vi si ons ( a bout 11 t i mes
t he ‘ ¤™œ• / DI V swi t c h set t i ng) .
e . Set t he ‘ ¤™œ• / DI V
swi t c h t o 2 ms, t h e ’ ¤™œ• / DI V
swi t c h t o 1 ms, t h e H
O
R I Z
DI S PL AY swi t c h t o ’
( D EL AY E D S WEEP) an d t h e D EL AY- TI ME MUL
TI PL I ER
di al t o 0 . 10 .
• Ÿ¤•

43 . C h ec k ‘
Swee p
Out p
ut Si gnal
± . Connect t he ‘ S WEEP connect or ( on t h e i nst r
u ment
si d e p anel ) t o t he t est osci l l osco p e i nput connect or t h r oug h
± 42- i nc h 50 © BN C ca b l e .
b . Set t h e ‘ ¤™œ• / DI V swi t c h t o 1 ms .
c .
C
HE CK - Test osci l l oscope d i s p l ay f or ± ver t i cal d e-
f l ect i on of a pp r oxi mat el y 5 d
i vi si ons wi t h t he bot t om of
t he wavef or m near zer o vol t s . Swee p d ur at i on s h o u l d
be
abo u t 5 . 5 d i vi si ons ( a b out 11 t i mes t he ‘ ¤™œ• / DI V
swi t c h set t i ng) .
± . Set t h e ‘ and ’ ¤™œ• / DI V swi t c h es t o 1 ms, t h e ‘
S WEEP M OD E swi t c h t o A U TO TR I G, ’ S WEEP M OD E

Th i s com p l et es t he per f or mance c h ec k p r oce d ur e f or t he
swi t c h t o ’ STA R TS A F T ER D EL AY TI ME, and b ot h t he

454 ‘ . I f t h e i nst r ument h as met al l p er f or mance r e qu i r e-
‘ an d ’ T R
I GG ER
I N
G LEVEL cont r ol s f u l l y cl oc k wi se .

ment s gi ven i n t h i s p r ocedur e, i t i s cor r ect l y cal i br at e d an d
B e s u r e t he ‘ S WEEP LEN GT H
cont r ol i s set t o
FULL .

wi t h i n t he s p eci f i e d t ol er ances .