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Tektronix 454A User Manual

Tektronix 454A
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c u
r r ent
i s
d
eman
d e
d
f r om
t
h
e
Ser i es
R
eg
u
l at or ,
Q1137,
an
d
t
h
e
o
u
t
p
ut
of
t
h
e
+75-
V
ol t
S
u
pp
l y
.
R
egul at i on
of
t
h
e
out -
t
h
i s
c
u
r r ent
f l ows
t
h
r o
u
g
h R
1119
.
T
h
e vol t age
d
r op
acr oss
p
ut
vol t age
i s
cont r ol l e
d
by
E
r r or
Ampl i f i er
Q1184- Ql 193
R
1119
becomes
suf f i ci ent
t o
f or war
d b
i as
Q1119
an d
i t s
an
d
Ser i es
R
eg
u
l at or ,
Q1197,
i nzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
±
manner
si mi l ar
t o
t
h
at
col l ect or
cur r ent
pr od
u
ces an
i ncr ease
d
vol t age dr o p acr oss
d
escr i be
d f or
t
h
e
- 12-
V
ol t
S
u
pp
l y
.
T
h
e
+75
V
ol t s
a
d
j
ust -
R
1118
.
T
h
e
i ncr ease
d vol t age d
r o
p acr oss
R
1118
r e
d
uces
ment ,
R
1188,
set s
t
h
e qui escent
con
d
uct i on
l evel
of t
h
e
t
h
e
cur r ent
f l ow
of b ot
h
Q1133
and
Q1137
t o
l i mi t
t
h
e
E
r r or
Am
p
l i f i er
st age
t o p
r ovi
d e
an
o
u
t p
u
t
l evel
of
+75
o
u
t
p
ut
c
u
r r ent
.
C
R
1125
pr ot ect s
t
h
i s
ci r cui t
f r om
d
amage
vol t s
.
T
h
e o
u
t
pu
t
of
t
h
e
+150-
V
ol t
Sup
p
l y
( unr egul at e
d
)
i s
i f
i t s
o
u
t
p
u
t
i s
s
h
or t ed t o
one
of
t
h
e
posi t i ve
s
u
pp
l i es
.
connect e
d t o
t
h
e
E
r r or
Am
p
l i f i er
t o
p
r ovi
d
e
t
h
e
r e
q
u
i r e
d
col l ect or
l evel
f or
st abl e
o
p
er at i on
.
Zener
d
i o
d
e
VR
1190
set s
t
h
e
col l ect or
of
Q1193
at
abo
u
t
+80
vol t s
and
zener
T
h
i s
i nst r ume
n
t
i s
desi gne
d
so
t
h
at
al l
p
ower
i s
i nt er -
d
i o
d e
VR
1182
est abl i shes
a
l evel
of
about
+105
vol t s
at
t
he
r
u
p
t e
d
i f
any
one
of
t
h
e
su
pp
l i es
i s
s
h
or t ed t o
gr oun
d
.
j
u n
ct i o
n
of
131182- 131183
.
T
h
en,
R1183,
zener
d
i o
d e
C
R
1120
r e
d
u
ces
t
h
e
- 12-
V
ol t
S
u
p pl y
out
p
ut
i f
t
h
e
+12-
VR
1184
a nd
R
1184
dr o
p
t
h
i s
vol t age
t o
t
h
e
cor r ect
l evel
vol t s
out
p
u
t
i s
s
h
or t ed
.
Si nce
t
h
e
o p
er at i ng
l evel
f or
Q1116
f or
t
h
e
o
p
er at i on
of
Q1184
.
C
R
1189
p
r ovi des
t
h
er mal
com
an d
Q1133
i s
obt ai ned
f r om
t
h
e
+75- vol t
o
u
t
pu
t t
h
r o
u
g
h
pe
n
sat i on
f or
t
h
e
E
r r or
Am
p
l i f i er
.
R
1118,
t
h
e
- 12-
V
ol t
Sup
p
l y i s s
h ut
of f
i f
t
h
e
+75- vol t
out p
u
t
i s
s
h
or t e
d
.
L
i
k
ewi se, si nce
bot
h
t
h
e
+75-
V
ol t
S
u
pp
l y
an d
t
h
e
+12-
V
ol t
S
u
pp
l y
ar e
r ef er enced
t o
t
h
e
- 12- vol t
Q1194
p
r ot ect s
t
h
i s
su
pp
l y
i f
t
h
e
o
u
t
p
u
t
i s
s
h
or t e
d
t o
o
u
t
p u
t ,
t
h
ese
su
pp
l i es
ar e
shut of f
i f
t
h
e
- 12- vol t
o
u
t
p
u
t
i s
gr o
u
nd
.
I f t
h
i s
occur s,
excess
cur r ent
i s
d
eman
d
e
d
f r om
t
h
e
s
h
or t ed
.
Ser i es
R
egul at or ,
Q1197,
an
d
t
h
i s
a
dd
i t i onal
c
u
r r ent
t
h
r oug
h
R
1197
r ai ses
t
h
e
emi t t er
of
Q1197
mor e
p
osi t i ve
.
T
h
i s
p
r o
d
uces
±
cor r espon
d
i ng
c
h
ange
at
t
h
e base of
+12-
V
ol t
Suppl y
Q1197,
w
h
i c
h
i s
connect ed
t o
Q1194
t
h
r o
u
g
h
d
i vi
d
er
R
ect i f i e
d vol t age
f or
oper at i on
of
t
h
e
+12-
V
ol t
Su
pp
l y
i s
R1193- R1194
.
U
nder
nor mal
condi t i ons,
t
h
i s
di vi
d
er set s
pr ovi
d e
d
by
C
R
1142A- D
.
T
h
i s
vol t age
i s
f i l t er ed
by
t he
base
l evel
of
Q1194
so
Q1194
i s
a
b
o
u
t
zer o
b
i ase
d
.
C1142-
R
1142
an d
connect e
d
t o
t
h
e
+12-
V
ol t
Ser i es
R
eg
u
-
However ,
w
h
en
t
h
e
out
p
ut
i s
s
h
or t e
d
,
t
h
e p
osi t i ve- goi ng
l at or
an d t o
t
h
e
H
i g
h
-
V
ol t age Osci l l at or st age
i n
t
h
e
C
R
T
change
acr oss
t
h
e
di vi
d
er
R
1193-
R
1194
r ai ses
t
h
e
b
ase
l evel
Ci r cui t
.
R
ef er ence vol t age
f or
t
h
i s
su
pp
l y
i s
p
r ovi
d
e
d b
y
of
Q1194
p
osi t i ve
and
i t
i s
f or war
d
bi ased
.
Wh
en
Q1194
vol t age
di vi
d
er
R
1157-
R
1158-
R
1159
b
et ween
t
h
e
r eg
u
l at e
d
comes
on,
i t s
col l ect or
goes
negat i ve
an
d
i t
t ur ns
Q1193
of f
- 12
vol t s
an
d
t
h
e o u
t
p
ut
of
t
h
i s
sup p
l y
.
T
h
e
- 12
vol t s
i s
t o
r educe
t
h
e cur r ent
f l ow
t
h
r oug
h
t
h
e
Ser i es
R
eg
u
l at or
h
el
d
st a
b
l e
by
t
h
e
- 12-
V
ol t
S
u p
p
l y
as
d
i scusse
d p
r evi o
u
sl y
.
st age,
Q1
197,
an
d
t
h
e o
u
t
p
u
t
vol t age
d
r ops
t owar
d
gr o
u
n
d
.
I f t
h
e
+12- vol t
o
u
t p u
t
c
h
anges,
t
h
i s
c
h
ange
a p
p
ear s
at
t
h
e
T
h
e
out
p
u
t c
u
r r ent
al so
d
ecr eases
an
d
r emai ns
l ow
u
nt i l
t
h
e
b
ase
of
Q1154
as
an
er r or
si gnal
.
R
egul at i o
n
of
t
h
e
o
u
t
p
u
t
excessi ve
l oa
d
i s
r emove
d
.
C
R
1193
p
r ot ect s
Q1193
an d
vol t age
i s
cont r ol l e
d
b
y
t
h
e
+12-
V
ol t Ser i es
R
eg
u
l at or
st age,
CR
1185
p
r ot ect s
01184
f r om
excess
r ever se
vol t age
w
h
en
t
h
e
o
u
t
p
u
t
i s
s
h
or t e
d
.
C
R
1196
p
r ot ect s
t
h
e
+75-
V
ol t
Q1167,
i n
±
si mi l ar
manner
t o
t
h
at
d
escr i be
d
f or
t
h
e
Suppl y
f r om
d
amage
i f
i t
i s
s
h
or t e
d t o
t
h
e
- 12
vol t
s
u
p pl y
.
- 12-
V
ol t
Suppl y
.
T
h
e
+12-
V
ol t s
ad
j
ust me
n
t ,
R
1158,
set s
t
h
e
out
p ut
l evel
t o
+12
vol t s
.
C
R
1158
a
n
d
C
R
1
159
p
r ovi
d e
t
h
er mal
com
p ensat i on
f or
t
h
e
E
r r or
Am
p
l i f i er
.
C1155-
+150-
V
ol t
U
nr egul at e
d
Suppl y
R
1155
i mp r ove
r esponse
of
t
h
e
r egul at or
ci r cui t
t o
l ow-
f r equency
c
h
anges
at
t
h
e
out
p
ut
.
R
ect i f i er s
C
R
1202
an d
C
R
1212
p
r ovi
d
e
t
h
e
u
nr egul at e d
out
p ut
f or
t
h
e
+150- vol t
S
u
pp
l y
.
Ta
p
s
f r om
t
h
i s
secondar y
wi n
d
i ng
al so
p
r ovi
d e
t
h
e
necessar y
oper at i ng p
ot ent i al
f or
S
h
or t i ng
p
r ot ect i on
i s
p
r ovi
d e d
by
Q1149
an
d
R
1149
.
I f
t
h
e
cool i
n
g f an
mot or
.
T
h
e o
u
t
p
ut of
t
h
e
+75-
V
ol t
S
up
p
l y
t
h
e
o
u
t
p ut
of
t
h
i s
s
u
pp
l y
i s
s
h
or t ed
,
Q1149
i s
b
i ase
d
on
t o
i s
connect e
d
t o
t
h
e negat i ve
si
d e of
t
h
e
+150-
V
ol t
Su pp
l y
l i mi t
t
h
e
con
d
u
ct i on of
t
h
e
Ser i es
R
eg
u
l at or
i n
t
h
e
same
t o
el evat e
t
h
e
out
p u
t
l evel
t o
+150
vol t s
.
Di o
d
es
C
R
1202
manner
as
d
escr i
b
ed f or
t
h
e
- 12-
V
ol t
S
h
or t -
P
r ot ect i on
an
d
CR
1212
ar e
con
n
ect ed
as
± f
u
l l - wave
cent er - t a
p
p
e
d
Ampl i f i er
.
C
R
1154pr ot ect s
Q1154when
t
h
eout put
of t hi s
r ect i f i er ,
an
d
t
h
e
out
p
ut
i s
f i l t er e
d
b y
su
pp
l y
i s
s
h
or t e d
.
C1202- C1204- 131202- 131204
t o
h
ol
d
t
h
e
out
p ut
l evel
at
a
b
out
+150
vol t s
.
Fu
se
F1204
p
r ot ect s
t
h
i s
su
pp
l y
i f
t
h
e
o
u
t
p u
t
i s
s
h
or t e
d
.
+75-
V
ol t
Supp
l y
C
R
1172A- D
p
r ovi des
t
h
e
r ect i f i e
d vol t age f or
t
he
6
. 3- Vol t
RM
S
AC
Sour ce
+75-
V
ol t
Sup
p
l y
.
C1172
and
R1
172
f i l t er
t oe
r ect i f i e
d
vol t -
age,
w
h
i c
h
i s
connect e
d t o
t
h
e
+75-
V
ol t
Ser i es
R
eg
u
l at or
.
T
h
e
6
. 3- vol t
RM
S
secon
d ar y
wi n
d
i ng
of
¤
1101
p
r ovi
d
es
R
ef er ence
vol t age
f or
t
h
i s
s
u
pp
l y
i s
p
r ovi
d
e
d b
y
vol t age-
p
ower
f or
t
h
e
P
O
WER
ON
l i g
h
t ,
DS1107,
and
t
h
e
scal e
d
i vi
d
er
R
1187- 131188-
R
1189
b
et ween
t
h
e
r eg
u
l at e
d
- 12
i l l
u
mi nat i on
l i g
h
t s
DS1108
an d
DS1109
.
T
h
e
cur r ent
vol t s
an
d
t
h
e
o
u
t p
u
t
of
t
h
i s
s
u p pl y
.
Si nce
t
h
e
- 12
vol t s
i s
t
h
r ou
g
h
t
h
e
scal e
i l l
u
mi nat i o
n
l i g
h
t s
i s
cont r ol l ed
by
t
h
e
h
el
d
st a
b
l e
b y
t
h
e
- 12
V
ol t
R
eg
u
l at or
ci r c
u
i t ,
any
c
h
ange
SCA
LE
™
LLUM
cont r ol ,
R
1108,
t o
c
h
ange
t
h
e
i l l
u
mi nat i on
at
t
h
e
b
ase of
E
r r or
Ampl i f i er
01184
i s
d
ue
t o a
change
at
of
t
h
e
gr at i cul e
l i nes
.
V
ol t age
d
i vi
d
er
R1104- R1105
p
r o-
Ci r cui t
Desc
r
i pt i on- 454
‘
/
R
454A
3-
33

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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