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Tektronix 454A - Page 147

Tektronix 454A
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f
.
R
et
u
r n
t
h
e
aut ot r ansf or mer
o
u
t
p
u
t
vol t age
t o
t
h
e
cent er
of
t
h
e
r egul at i ng
r ange
sel ect e
d b y
t
h
e
L
i ne
V
ol t age
Sel ect or
assembl y
.
5
.
C
h
ec
k
L
ow-
V
ol t age
P
ower
Supp
l y
R
i
pp
l e
b
.
Connect
1
mi l l i secon
d
t i me
mar
k
er s
f r om
t
h
e
t i me-
NOTE
mar
k
gener at or
t o
t
h
e
C
H
2
i n
p
u
t
connect or
vi azyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
±
42- i nc
h
BN
C
ca
b
l e
.
d
.
P
osi t i on
t
h
e d
i s
p
l ays
so
t
h
e
t i
p
s
of
t
h
e
mar
k
er s
f al l
b
.
Set
t
h
e
t est
osci l l osco
p
e
f or
±
ver t i cal
d
ef l ect i on
of
j
ust
bel ow
t
h
e
r i si ng
p or t i ons of
t
h
e
s
q uar e
wave
.
0 . 005
vol t s/ di vi si on,
AC
cou
p
l e
d
,
at
±
swee
p
r at e
of
f i ve
mi l l i seconds/
d
i vi si on
.
U
se
l i ne- f r e
q
u
ency
t r i gger i ng
t o
p
r o-
vi
d e
±
st abl e
d
i s
p
l ay
.
e
.
C
HE
C
K
- C
R
T
d
i s
p
l ay
f or
one
cycl e
of
cal i
b
r at or
wavef or m
f or
eac
h
t i me
mar
k
.
c
.
CHECK- Two
mi l l i vol t s
( 0 . 4
d
i vi si on)
p
ea
k
- t o-
p
ea
k
f
.
AD
JU
ST- Cal i br at or
F
r e
q
uency
a d
j u
st ment
¤
1275
maxi m
u
m
l i ne- f r e
qu
ency
r i
pp
l e
on
t
h
e
- 12- vol t ,
+12- vol t ,
( see
F
i g
.
5- 4)
f or
one
cycl e
of
cal i br at or
wavef or m
f or
eac
h
an d
+75- vol t
su
pp
l i es
w
h
i l e c
h
angi ng
t
h
e
a
u
t ot r ansf or mer
t i me
mar
k
.
o
u
t p
ut
vol t age
t
h
r oug
h
out
t
he
r eg
u
l at i ng
r ange
sel ect e
d
by
t
h
e
L
i ne
V
ol t age
Sel ect or
assem
b
l y
on
t
h
e
r ear
panel
.
P
ower - su
pp
l y
t est
p
oi nt s
ar e
s
h
own
i n
F
i g
.
5- 3
.
g
.
Set
™• ¤ T
R
I G
swi t c
h
t o
C
H
1
O
NL
Y O
R
§
-
¥
and
t
h
e
‘
¤™œ•
/ DI
V
swi t c
h
t o
. 2
ms
.
d
.
R
et
u
r n
aut ot r ansf or mer
o u
t
p
u
t
vol t age t o
t
h
e
cent er
h
.
C
HE
C
K
- C
R
T
d
i s
p
l ay f or
sl ow, or no, d
r i f t
o
f t
he
of
t
h
e
r egul at i ng
r ange
sel ect ed
by
t
h
e
L
i ne
V
ol t age
t i me
mar
k
er s
.
Sel ect or
assem
b
l y
.
( I f t
h
e
l i ne
vol t age
i s
near
t
h
e cent er
of
t
h
e
r egul at i ng r ange,
t
h
e
454
‘
can
b
e
connect e
d d
i r ect l y
t o
t
h
e
l i ne
;
ot
h
er wi se,
l eave
t
h
e
i nst r ument
connect ed
t o
t
h
e
i
.
AD
JU
ST- Cal i
b
r at or
F
r e
q
u
ency
ad
j
ust ment
¤
1275
a u
t ot r ansf or mer
f or
t
h
e
r emai n
d
er
of
t
h
i s
pr oce
d
ur e
. )
( see
F
i g
.
5- 4)
f or
mi ni mum
d
r i f t
of
t i me
mar
k
er s
.
T
h
i s
st ep
al so
c h ec
k
s
r egul at i on
of
t
h
e
l ow- vol t age
suppl i es
.
±
.
Connect
±
1
§
p
r o
b
e
t o
t
h
e
t est
osci l l osco
p
e i n
p
u
t
.
e
.
Di sconnect
al l
t est
eq
ui p
ment
.
j
.
Di sconnect
al l
t est
e q
ui
p
ment
.
NOTES
6
.
A
d
j
ust
Cal i br at or
R
ep
et i t i on
R
at e
i n
p ut
connect or
vi a
an
18- i nc
h
BN
C
ca
b
l e
.
A
d
j
Å
st ment - 454
‘
/
R
454
‘
±
.
Set
t
h
e
C
H
1
an
d
CH
2
VO
L
TS/ DI
V
swi t c
h
es
t o
. 5,
t
h
e
M
OD
E
swi t c
h
t o
A
L
T, an d
t
h
e
‘
S
WEEP
M
OD
E
swi t c
h
t o
A
U
TO
T
R
I G
.
c
.
Connect
t
h
e
1
V
CA
L
1
kH
z
connect or
t o
t
h
e
C
H
1

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