Tektronix 454A - Page 146

Adj ust ment - 454A / R 454A
e . R e- i nst al l Q1275 i n i t s soc
k
et on
t he Cal i br at or ci r -

4 .
A
d j
ust
Hi gh- Vol t age
Su pp l y an d C hec k
R
eg-
cui t boar d .

ul at i on
f . Connect t h e p r eci si on DC
vol t met er bet ween t he
+12- vol t t est p oi nt on t he L
ow- V ol t age R eg u l at or ci r c u i t
boar d an d c h assi s gr o un
d .
See
F i g . 5- 3 .
g . C HE CK -
M et er r ea d i ng of +12 . 0 t o +12 . 2 vol t s .
h . I N T ER ACTI O
N - M ay af f ect o per at i on of al l ci r cui t s
wi t h i n t he 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ‘ .
3 . A d j ust
+75- V ol t P ower Su pp l y
± .
Connect t h e p r eci si on DC
vol t met er bet ween t h e
+75- vol t t est p oi nt on t he L ow
V ol t age R egul at or ci r c u i t

e . C HE CK - C h ange t he a u
t ot r ansf or mer out put vol t age
boar d ( see F i g . 5- 3) an d c h assi s
gr o u nd .

t h r oug h o u t

t he

r egul at i ng

r ange

sel ect e d  by

t he

L i ne
V ol t age Sel ect or
assembl y
on
t he r ear p anel an d c hec k f or
l ess t
h
an
±58 . 8 vol t s c h ange i n t he h i g h - vol t age
o ut p u t
b . C
HE CK - M et er r eadi ng of
+75 vol t s ( ±0 . 75 vol t ) .

l evel . Al so var y t he I N T EN SI TY cont r ol
t hr ou g h out i t s
r ange at t h e maxi mum and mi ni m
u m l i ne vol t age ; c hec k
t h at r egul at i on r emai ns
wi t h i n gi ven l i mi t s .
c . AD JU ST-
+75 V ol t s a d j ust ment
R 1188 ( see F i g .
5- 3) f or
± met er r ea d i ng of
+75
vol t s ( ±0
. 278 vol t ) .
I f t he hi gh- vol t age
suppl y i s out of r egul at i on,
check
d . I NT ER
ACTI O N- M ay af f ect o p er at i on
of al l ci r cui t s

t he
r egul at i on of t he l ow- vol t age
suppl i es ( st ep 5)
wi t h i n t
h
e
454 ‘ .

bef or e t r oubl eshoot i ng i n t he
hi gh- vol t age suppl y .
5- 3 2
± . Connect t h e p r eci si on DC
vol t met er ( u se t h e p r e-
ci si on 2 kV d i vi
d
er )
b et ween t he - 1960 V t est p oi nt ( see
F
i g .
5- 5) an d c h assi s gr oun d .
b . C HE CK - M et er r ea d i ng
of - 1960 vol t s ( ±58 . 8 vol t s) .
µ . AD JU
ST- H i g h - V ol t age ad j u st ment R 1401
( see F i g .
5- 5)
f or ± met er r ea d i ng of - 1960 vol t s ( ±19 . 6
vol t s) .
d . I NT ER ACTI O
N - M ay af f ect o p er at i on of
al l ci r cui t s
wi t h i n t he
454 ‘ .
F i g . 5- 5 .
L ocat i o n of h i g h - vol t age and
Z- AXI S ad j ust ment s a n d t est - p
oi nt s .
NO ¤•