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Tektronix 454A User Manual

Tektronix 454A
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Ci r cui t
Descr i pt i on
- 454A/ R454A
Di agr am
12
s
h
owszyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
±
compl et e
d
i agr am
of
t
h
e
H
O
R
I Z
DI S-
vi
d
es
±
f ast er
r ecover y
t i me
f or
Q1018
an
d
Q1020
t o i m
PL
AY
swi t c
h
.
Now,
t
h
e
ci r cui t
o
p
er at es
m
u
c
h
t
h
e
same
as
p
r ove
o
p
er at i on
at
f ast
swee
p
r at es
.
j
ust
d
escr i be
d
wi t
h
t
h
e
sawt oot
h
i n
p
u
t
.
‘
posi t i ve- goi ng
si gnal
f r om
C
h
annel
1
p
r oduces
±
c
u
r r ent
c
h
ange
at
t
h
e
b
ase
of
01016
w
h
i c
h
i ncr eases
t
h
e
c
u
r r ent
f l ow
t
h
r oug
h
t
h
e
Si gnal
L
i
mi t i ng
Push- Pul l
Ampl i f i er
t r ansi st or
.
T
h
e
col l ect or
of
Q1016
goes
negat i ve,
w
h
i l e t
h
e
Q1038
an
d
01048
comp
r i se
±
nor mal
push- pul l
am
p
l i -
emi t t er - co
u
p
l e
d
si gnal
t o
Q1012
pr o
d uces ± p
osi t i ve- goi ng
f i er
.
Di o
d
es
C
R
1030,
C
R
1031,
C
R
1032
an
d
CR
1033
l i mi t
c h
ange
at
t
h
e
col l ect or
of
Q1012
.
Si nce
t
he base of
Q1012
t he
si gnal
d
i f f er ence
b
et ween
t
h
e bases
of
01038
an
d
i s
gr oun
d ed
,
t
h
e
P
OSI TI O
N
an
d
F
I
NE
cont r ol s
ar e
d
i s-
nect e
d
f r om
t
h
e
i n
p
u
t
.
T
h
e
DC
l evel
of
t
h
e
C
h
annel
1
Q1048
t o
abo
u
t
1
. 2
vol t s
t o
p r event
t
h
i s
st age
f r om
bei ng
con
si gnal as
d
et er mi ned
b y
t
h
e
C
H
1
P
OSI TI O
N
cont r ol
d
et er -
over dr i ven
.
Q1051
and
01053
i n t
h
e
col l ect or
ci r cui t s
ar e
mi nes
t
h
e q ui escent
DC
l evel
at
t
h
e
h
or i zont al
d
ef l ect i on
t r ansi st or s
connect e
d
as
d
i odes,
w
h
i c
h
l i mi t
t
h
e
maxi mum
.
f l ow
of
cur r ent
t o
t
h
e b ase t er mi nal s
of
01060
an
d
01080
pl at es
.
t o a
b
o
u
t
15
mi l l i am
p
er es
an
d
p r event
over d
r i ve
of
t
h
e
out -
p
ut
st ages
.
Gai n Set
Push- Pul l
Am
p
l i f i er
T
h
e push- pul l o
u
t
p
u
t
of
t
h
e
I n
p
u
t
P
ar a
p
h
ase
Ampl i f i er
i s
T
h
e
M
ag
R
egi st er
a
d
j u
st ment ,
81031,
bal ances
t
h
e
connect ed
t o
t
h
e
b
ases
of
Q1018
an d
Q1020
.
T
h
i s
st age
qui escent
DC
cur r ent
t o
t
h
e
base
of
Q1038
an
d
Q1048
so ±
pr ovi
d
es
a
d j u
st ment
t o
set
t
h
e
nor mal
an
d
magni f i e
d
h
or i -
cent er - scr een
d
i s
p
l ay
does
not
c
h
ange
p
osi t i on
w
h
en
t
h
e
zont al
gai n,
an
d
±
M
AG
swi t c h t o p
r ovi
d e ±
h
or i zont al
M
AG
swi t c
h
i s
c
h
ange
d
f r om
§
10
t o
O
FF
.
swee
p
wh
i c
h
i s
magni f i e
d 10
t i mes
.
F
or
nor mal
swee
p
(
M
AG
swi t c
h
set
t o
O
FF) ,
81024
an d
81025
cont r ol
t
h
e
emi t t er
d
egener at i on
bet ween
Q1018
an d
Q1020
t o
set
t
h
e
gai n
of
t
h
e
st age
.
§
1024,
N
or mal
Gai n,
i s
a
d j u
st e
d t o p
r o-
T
h
e
BANDWI DTH- BEAM
F
I
N
D
ER
swi t c
h
,
S345,
r e-
vi de
cal i br at ed
h
or i zont al
swee
p
r at es
.
Wh
en
t
h
e
M
AG
d
uces
h
or i zont al
scan
by
r e
d
u
ci
n
g
t
h
e
gai n of
t
h
e
Si gnal
swi t c h
,
S1001
’
,
i s
set
t o
t
h
e
§
10
p
osi t i on,
§
1026
a
nd
L
i mi t i ng
Push- Pul l
Am
p
l i f i er
st age
.
N
or mal l y
t
h
e emi t t er s
R1027
ar e
connect e
d
i n
p
ar al l el
wi t
h
R1024
an
d
R1025
of
Q1038
and
Q1048
ar e r et
u
r ne d t o
+12
vol t s
t
h
r oug
h
( excep
t
i n
§
-
¥
p
osi t i on
of
—Ÿ
R™–
DI S
PL
AY
swi t c
h
) .
T
h
i s
81044
an
d
81046
.
H
owever ,
w
h
en
t
h
e
B
A
N
D
W
I DT
H
-
a
dd
i t i onal
r esi st ance
d
ecr eases
t
h
e emi t t er
degener at i on
of
BEAM
F
I
N
D
ER
swi t c
h
i s
pr essed
down
t o
t
h
e
BEAM
t
h
i s
st age
an d
i ncr eases
t
h
e
gai n
10
t i mes,
81026,
M
ag
F
I
N
D
ER
p
osi t i on,
r esi st or
81045
i s
a
d
de
d
i n
ser i es
Gai n,
i s
a
d
j u
st e
d
t o p
r ovi
d e
cal i br at ed
magni f i ed
swee
p
bet ween
r esi st or s
81044- 81046
an
d
+12
vol t s
.
T
h
i s
l i mi t s
r at es
.
Wh
en
t
h
e
M
AG
swi t c
h
i s
set
t o
§
10,
t
h
e
M
AG ON
t he out
p
u
t
swi ng
of
t
h
e
H
or i zont al
Am
p
l i f i er
t o
l i mi t
t
h
e
l i g
h
t ,
DS1029,
i s
connect ed
t o
t
h
e
+150- vol t
su
pp
l y
t r ace
wi t
h
i n t
h
e
gr at i c
u
l e
ar ea
.
t
h
r oug
h
81029
.
DS1029
i s
i gni t e
d
t o
i n
d
i cat e
t
h
at
t
h
e
swee
p
i s
magni f i e
d
.
H
owever ,
i n
t
h
e
§
-
¥
p
osi t i on
of
t
h
e
HO
R
I Z
DI S
PL
AY
swi t c
h
,
+12
vol t s
i s
connect e
d acr oss
Out
p
ut
Ampl i f i er
DS1029
t o
kee p
i t
f r om
i gni t i ng
.
T
he
H
O
R
I Z
DI S
PL
AY
swi t c h
al so
d i sconnect s
t
he
M
AG
swi t c
h
so
t
h
e
h
or i zont al
T
h
e
push- pul l
o
u
t
p
u
t
of
t
he
Si gnal
L
i mi t i ng
Push- Pul l
gai n
i s
cor r ect f or
§
-
¥
o p
er at i on
(
h
or i zont al def l ect i on
Am
p
l i f i er
st age
i s
connect ed
t o
t
h
e
Out
p
u
t
Am
p
l i f i er
f act or
i n
d
i cat e
d
by
C
H
1
VO
L
TS/ DI
V
swi t c
h
)
r egar
d
l ess
of
t
h
r oug
h
t
h
e
cur r ent
l i mi t i ng t r ansi st or s
Q1051
an d
Q1053
.
t
h
e
set t i ng
of
t
h
e
M
AG
swi t c
h
.
E
ac
h h
al f
of
t
h
e
O
u
t
p
u
t
Am
p
l i f i er
can
be consi d
er e
d as ±
si ngl e- en
d e
d
f eed
b
ac
k
am
p
l i f i er
w
h
i c
h
am
p
l i f i es
t
h
e
si gnal
c u
r r ent
at
t
h
e
i n
p
u
t
t o pr o d
uce
±
vol t age
o
u
t
p
u
t
t o
dr i ve
Di o
d es
C
R
1024
an
d
CR
1025
i n t
h
e emi t t er
ci r c
u
i t s
of
t
h
e
h
or i zont al
d
ef l ect i on
p
l at es
of
t
he
C
R
T
.
T
h
e
am
p
l i f i er s
Q1018
an d
01020
r es
p
ect i vel y,
p
r ovi
d e
l i mi t i ng
t o
p
r event
h
ave
±
l ow
i n
p ut
i m
p e
d
ance
an d
r e
qu
i r e
ver y
l i t t l e
vol t age
t
h
e
t r ansi st or s
i n t
h
i s
r ange
f r om
goi
n
g
i nt o
c
u
t of f
or
sat -
c h
ange
at
t
h
e i n
p ut t o p
r oduce
t
h
e d
esi r e
d
out put
c
h
ange
.
ur at i on
w
h
en
t
h
e
swee
p
i s
magni f i e
d
,
or
t
h
e d
i s
p
l ay
i s
p
osi -
Tr ansi st or s
Q1060
ar i d
01080
ar e
i nver t i ng
am
p
l i f i er s
t i oned
t o
an
ext r eme
i n
ei t
h
er d
i r ect i on
.
F
or
exam
p
l e,
as
w
h
ose
col l ect or
si gnal s
d
r i ve
t
h
e
emi t t er s
of
com
p
l i ment ar y
t
h
e base of
01018
i s
d
r i ven
p
osi t i ve
by
t
h
e
swee
p
si gnal
am
p
l i f i er s
Q1064- Q1066
an
d
01084- 01086
r es
p
ect i vel y
.
(
M
AG
swi t c
h
set
t o
§
10) ,
t
h
e
cur r ent
t
h
r oug
h
81021
i n-
Tr ansi st or s
Q1078
and
Q1098
ar e emi t t er
f ol l ower s
i
n
t
h
e
cr eases
u
nt i l t
h
e vol t age
acr oss
C
R
1024
i s
t oo l ow
t o
k
ee p
negat i ve- f ee
d
bac
k
pat
h
s t
h
at r e
d
uce
l oa
d
i ng
on
t
h
e
o
u
t p
u
t
i t
f or war d
bi ase
d
.
C
R
1024
t
h
en d i sconnect s
R
1021
and
t
h
e
of
t
h
e
am
p
l i f i er ,
t
h
er eby
i mp r ovi ng
t
h
e
over al l
am
p
l i f i er
emi t t er
cou
p
l i ng
net wor
k
R1024- R1025- R1026- R1027,
t o
f r e
qu
ency
r es
p
onse
.
T
h
e o
u
t
p
u
t si g
n
al
f r om
com
p
l i ment ar y
l eave
onl y
R1018
as
t
h
e
emi t t er
r esi st or
f or
Q1018
.
Si nce
am
p
l i f i er
Q1064- Q1066
d
r i ves
t
h
e
l ef t
h
or i zont al
d
ef l ect i on
R
1018
a
d ds
mor e
r esi st ance
i n
t
h
e
emi t t er
ci r cui t ,
t
h
e
gai n
p
l at e
of
t
h
e
C
R
T,
an d
t
h
e
out
p
ut
si gnal
f r om
com
p
l i -
of
Q1018
i s
d
ecr ease
d an d
i t
al so
h
as
mor e
d
ynami c
r ange
.
ment ar y
am
p
l i f i er
Q1084- Q1086
d
r i ves
t
h
e
r i g
h
t
h
or i zont al
Al t
h
oug
h
t
h
i s
p
r o
d
uces
d
i st or t i on
i n t
h
e
si gnal
at
t
h
e
col -
d
ef l ect i on
p
l at e
.
C1074,
C1094,
C1095
and
R
1095
a
d
j
ust
l ect or
of
01018,
i t
occ
u
r s i n t
h
e p or t i on of
t
h
e
sawt oot
h
t
h
e
t r ansi ent
r es
p
onse
of t
h
e
ampl i f i er
so
i t
h
as
goo
d
l i near -
w
h
i c
h
i s
not
d
i s
p
l aye
d
on
t
h
e
C
R
T
.
T
h
i s
ar r a
n
gement
pr o-
i t y
at f ast
swee
p
r at es
.
3-
30
‘

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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