Power Transformer - Tektronix 5440 Instruction Manual

ι
'
P
ower Transformer
T
h
e 5400-series
oscilloscope transformer
p
ermits
o p eration from 100-volt, 110-volt, 120-volt, 200-volt, 220-
' volt, and 240-volt sources wit
h
power-li
n
e fre
q
uencies of
50 to 400
h
ertz . T
h
e range for w
h
ic h
t
h
e p rimary ta
p
s are
set is mar
k
e d on t
h
e rear p anel of t
h
e instrume
n
t . U se t
h
e
following proce
d
ure to obtai
n
correct i
n
strume
n
t o
p
era-
tion from t
h
e line voltage availa
b
le .
2 .
R
emove t
h
e bottom dust cover of t
h
e i
n strume
n
t to
' gai
n
access to t
h
e
P
ower Supply circuit board .
ι
ι
ι
ι
1
ι
ι
1 . Disco
nn
ect t
h
e instrume
n
t from the p ower source .
3 . Co
n
vert from 120 volts to 220 volts
n
ominal li
n
e
voltage, or vice versa, remove t
h
e line-selector bloc
k
from
t
h
e s
q
uare-
p
i
n
co
nn
ectors (see
F
ig . 1-3) a
n
d re
p
lace it
wit
h
t
h
e ot
h
er bloc
k
. R emove t
h
e li
n
e fuse from t
h
e fuse
h
ol
d
er locate
d
on th e rear p a
n
el and re
p
lace it wit
h on
e
h
avi
n
g t
h
e correct rati
n
g . T
h
e u
n
use
d
li
n
e-selector bloc
k
and
li
n e fuse can b e stored on t
h
e
P
ower Supply circuit
boar
d
. C
h
a
n
ge t
h
e line-cord p ower p lug to matc
h
t
h
e
p ower-source rece p tacle or use an a d a p ter .
ΝΟΤΕ
T
h
e 120-volt bloc
k
is color coded b rown, and it
connects
t
h
e transfo rmer primary windings in
p
a
r
a l lel. T
h
e 220-volt bloc k is colo
r
coded red, and it
co n nects
t
h
e
p
rimary windings in series .
4 . To c
h
ange regulating ranges, p lace t
h
e li
n
e-selector
bloc
k
on t
h
e
d
esired set of s q uare pins . Select α range t
h
at
is centere d about t
h
e average line voltage to w
h ic h
t
h
e
i
n
strume
n
t is to be co
nn
ecte d (see Table 1-2) .
' 5 . C
h
a
n
ge t
h
e nominal line voltage information on t
h
e
rear panel of t
h
e instrume
n
t . U se α non-abrasive eraser to
remove t
h
e
p
revious data, an d mar k
in new data wit
h
α
pe
n
cil .
6 .
R
e p lace t
h
e bottom
d
ust cover an d apply p ower to
t
h
e i
n
strument .
Operating Informatio n-5440
TABLE 1-2
R egulating R anges for
P
ower Transformer
L i
n
e
Selector
B loc
k R
egulating R ange
P
ositio
n
120-
V
olts
N
omi
n
al 220-
V
olts N omi
n
al
L
90
V
AC to 110
V
AC 180
V
AC to 220
V
AC
Μ
99 V
AC to 121
V AC 198 V
AC to 242
V
AC
Η
108 V
AC to 132
V
AC 216
V
AC to 264
V
AC
L
i
n
e
F
use 1 .25 Α slow-blow 0 .7 Α slow-blow
CA
U
TIO
N
λλΛΛΛΛΛΛ
I
Damage to t
h
e instrument may result from incorrect
placement of t
h
e line-selecto r
b
l oc k .
F
ig . 1-3 .
L
ocatio
n
of t
h
e line-selector
b
loc
k
on
t
h
e Power Sup
p
ly
ρ
circuit board .