EasyManuals Logo
Home>Tektronix>Test Equipment>454A

Tektronix 454A User Manual

Tektronix 454A
365 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #66 background imageLoading...
Page #66 background image
Ci r cui t
Descr i pt i on- 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
‘
/
R
454A
an
d
5
m
V
p
osi t i ons
of
t
he
C
H
1
VO
L
TS/ DI
V
swi t c
h
.
i n
p
u
t
si gnal
t o
±
push- pul l
out
p ut
si gnal
.
Gai n
of
t he
st age
i s
A
pp
r oxi mat e
gai
n
of
t h
i s
st age
i s
d
et er mi ne
d
by
t
he
d
et er mi ne
d
by
t
h
e
emi t t er
d
egener at i on
.
As
t
he
r esi st a
n
ce
f or mul a
:
bet ween
t h
e
emi t t er s of
Q64
an
d
Q74
i ncr eases,
emi t t er
R
42
+
R
47
d
egener at i on
i ncr eases
al so
t o
r es
u
l t
i n
l ess
gai n
t
h
r o
ugh
t
he
Vol t age
Gai n,
‘
=
R42
st age
.
T
he
GAI
N
ad
j
ust ment ,
R
67,
var i es
t
he
r esi st ance
b
et ween
t
he
emi t t er s t o
cont r ol
t he
over al l
gai n
of
t
h
e
T
h
e
val ue
of
f ee
d
b
ac
k
r esi st or
R
42
i s
c
h
ange
d
t o
pr ovi
d e
C
h
annel
1
Ver t i cal
P
r eam
p
ci r c
u
i t
.
Ca
p
aci t or
C78
i s
a
d
j u
st -
t
he
cor r ect
gai n
by
swi t c
h
i ng
i n
r esi st ances
i n
p
ar al l el
wi t h
ab
l e
t o var y
t
he
h
i g
h
- f r e
q uency
gai n
of
t
h
i s
st age
t o
pr ovi
d e
R
42
.
op
t i m
u
m
h
i g
h
- f r e
qu
ency
r es
p
onse
.
Ver t i cal posi t i on
of
t h e
t r ace
i s
d
et er mi ne
d by
t
h
e
set -
Tr ansi st or s
Q84
an
d
Q94
pr ovi
d e
t
he o
u
t
p
ut
si gnal
f r om
t i ng
of
t
he
P
OSI TI O
N
cont r ol ,
R
35
.
T
h
i s
cont r ol
ch
anges
t
he
C
h
annel
1
Ver t i cal
Pr eam
p
ci r cui t
.
T
he
si gnal at
t he
t
he
base
l evel
of
Q38,
w
h
i c
h ch
anges
t
he
cur r ent
d
r i ve t o
col l ect or s
of
Q64
and
Q74
i s
connect e
d
t o
t he
emi t t er s of
Q34
.
Si nce
t
he
emi t t er
of
Q34
i s
±
ver y
l ow- i mpedance
t
he gr ound
e
d
- base
st age,
Q84
an d
Q94
.
T
h
e out put
si gnal
p
oi
nt
i n
t
h
e
ci r c
u
i t ,
t h
er e
i s
negl i gi
b
l e
vol t age
ch
a
n
ge at
t h
i s
on
t
he
col l ect or s
of
Q84
an d
Q94
i s
connect ed
t o
t
he
p
oi nt
.
However ,
t
he c
h
ange
i n
cur r ent
f r om
t h
e P
OSI TI O
N
C
h
annel
1
Di o
d
e
Gat e
st age
i n
t
h
e
Ver t i cal
Swi t c
h
i ng
ci r -
cont r ol
p
r oduces
±
r esul t ant
DC
vol t age
at
t
he out
p
ut
of
cu
i t
.
‘
sam
p
l e
of
t
he
C
h
annel
1
si gnal
i s
t a
k
en
f r om
t
he
t
he
Fee
d
bac
k
Am
p
l i f i er
st age
t o
ch
ange
t
h
e
ver t i cal
posi -
emi t t er s of
Q64
and
Q74
an d
a
pp
l i e
d
t o
t
h
e
C
h
annel
1
t i on
of
t
he
t r ace
.
T
he
C
H
1
P
osi t i on
Cent er
a
d
j u
st ment ,
Tr i gger
P
i c
k
of f
st age
.
R
40,
i s
a
dj
ust e
d
t o
pr ovi de
±
cent er ed
di s
p
l ay
w
hen
t
h
e
C
H
1
P
OSI TI O
N
cont r ol
i s
cent er e
d
( wi t
h ±
zer o- vol t
DC
i n
p
ut
l evel )
.
C
h
annel
1
Tr i gger
Pi c
k
of f
Tr ansi st or
Q45
pr ovi
d
es
±
l ow- i mpedance
vol t age
so
u
r ce
f or
t
he
emi t t er
of
Q44
.
Var i abl e
r esi st or
R44
pr ovi
d
es
emi t t er
dam
p
i ng f or
Q44
t o
p
r event
h
i g
h
- f r e
q
uency
r i ng-
i ng,
an d
C45
p
r ovi
d
es
h
i g
h
- f r e
q
uency
peak
i ng
.
I n
d u
ct or
L
44
pr ovi
d
es
±
const ant
DC
bi as
f or
Q44
w
h
i l e
R44
i s
bei ng
a
d
j u
st ed
f or
cor r ect
h
i g
h
- f r e
q uency
r es
p
onse
.
T
h
e
out p u
t
si gnal
f r om
t he Feed
b
ac
k
Am
p
l i f i er
st age
i s
connect e
d
t o
t h
e P
ar a
p h
ase
Am
p
l i f i er
st age
.
Par a
ph
ase
Am
p
l i f i er
3-
6
T
he
C
h
annel
1
Tr i gger
P
i c
k
of f
st age
i s
an
emi t t er
cou p
l e
d
am
p
l i f i er
st age
wi t h
t
h
e
mai n
si gnal
dr i ve
a
p p
l i e
d
t o
t
he
b
ase
of
Q56
and t he out
p
u
t
si g
n
al
t a
ken f r om
t
h
e
col l ect or
of
Q54
.
T
h
i s
ci r c
u
i t
conf i g
u
r at i on
of f er s
goo
d
f r e
q
uency
r es
p
onse
and
DC
st a
b
i l i t y
an
d
r e
d u
ces
unwant e
d
common- mod
e
si gnal s
.
T
he
CH
1
Out
p u
t
DC
L
evel
a
d
j
ust -
ment ,
R
52,
a
d
j
ust s
t
h
e
DC
l evel
at
t
h
e
CH
1
O
U
T
co
n
-
nect or
f or
±
zer o- vol t
ou
t
p ut
l evel
w
h
en
t
h
e
C
h
annel
1
t r ace
i s
cent er ed
ver t i cal l y
.
O
u
t
p ut
f r om
t
he
C
h
annel
1
Tr i gger
P
i c
k
of f
st age
i s
connect e
d
t o
t
he
Tr i gger
P
r eamp
ci r cui t
t
h
r o
u
g
h
t
he
T
R
I GG
ER
swi t c
h
,
S238
B
.
T
he out p u
t
si gnal
f r om
t
h
e
Fee
d back
Am
p
l i f i er
st age
i s
CHANNEL
2
connect ed
t o
t
he
P
ar a
p
h
ase
Am
p
l i f i er
st age
t
h
r o
ugh
t
he
VER
TI CA
L
PRE
A
MP
VA
R
I A
BLE
cont r ol ,
R
60A-
R
60
B
.
T
h
i s
cont r ol
an
d
t
he
¤
- coi l ,
L
64,
ar e
desi gne
d
t o
pr ovi
d e ±
const ant
l oa
d
f or
Q44
Gener al
w
h
en
t h e
VA
R
I A
BLE
cont r ol
i s
r ot at e
d
.
Wh
en
t
h
e
V
A
R
I -
A
BLE
cont r ol
i s
set
t o
t
h
e
CA
L
p
osi t i on
( f ul l y
cl oc
k
wi se) ,
T
h
e
C
h
annel
2
Ver t i cal
P
r eam
p
ci r c
u
i t
i s
basi cal l y
t
h
e
R
60A
i s
b
y-
p
assed
an
d
R
60
B
i s
set f or
maxi mum
r esi st ance
.
same
as
t
he
C
h
annel
1
Ver t i cal
P
r eam
p
ci r c
u
i t
.
Onl y
t
he
Maxi mum
si gnal
c
u
r r ent
r eac
h
es
t
he
b
ase
of
Q64
.
Swi t ch
d
i f f er ences
bet ween
t
h
e
t wo
ci r c
u
i t s
ar e
d
escr i be
d
h
er e
.
S60,
ganged
wi t h
t
he
VA
R
I A
BLE
cont r ol ,
i s
cl ose
d an d
P
or t i ons
of
t
h
i s
ci r c
u
i t
not
descr i
bed
i n
t
he
f ol l owi ng
des-
t
he
UNCA
L
neon
bul
b
i s
by- passed
.
As
t
he
VA
R
I A
BLE
cr i
p
t i on
op
er at e
i n
t
he
same
manner
as
f or
t
he
C
h
annel
1
cont r ol
i s
r ot at e
d co
u
nt er cl oc
k
wi se
f r om
t
he
CA
L
d
et ent ,
Ver t i cal
P
r eam
p
ci r c
u
i t
( cor r es
p
on
d
i ng
ci r c
u
i t
nu
m
b
er s
S60
opens
and
t
he
UN
CA
L
l i g
h
t ,
DS63,
i gni t es
t o
i n
d
i cat e
assi gne
d
i n
t
h
e 100- 199
r ange)
.
Fi g
.
3- 3
s
h
ows
±
d
et ai l ed
t
h
at
t
h
e
ver t i cal
def l ect i on
f act or
i s
uncal i br at ed
.
T
h
e
si gnal
b
l oc
k
d
i agr am
of
t he
C
h
annel
2
Ver t i cal
Pr eamp
ci r cui t
.
‘
app
l i e
d
t o
t
h
e
base
of
Q64
i s
cont i nuousl y
r e
d u
ce
d
by
sc
h
emat i c
of
t
h
i s
ci r c
u
i t i s
s
h
own
on
d
i agr am
2
at
t
he
r ear
R
60A
as
t
he
VA
R
I A
BLE
cont r ol
i s
r ot at e
d
count er cl oc
k
-
of
t h
i s
man
u
al
.
wi se
.
At
t
he
same
t i me
t
h
at
t
h
e
r esi st ance
of
R
60A
i n-
cr eases,
t
he
r esi st ance
of
R
60
B
decr eases
so
t
he
combi
n
e
d
r esi st ance
of
R
60A,
R
60
B
and
R
62
r emai ns
t
he
same
t o
Par a
ph
ase
Am
p
l i f i er
mai nt ai n
±
const ant
l oa
d
f or
t he Fee
d
b
ac
k
Am
p
l i f i er
st age
.
T
h
e
basi c
C
h
annel
2 P
ar a
p
h
ase
Am
p
l i f i er
conf i g
u
r at i on
an d
o
p
er at i on
i s
t
h
e
same
as
f or
C
ha
n
nel
1
.
H
owever ,
t
h
e
I
NVER
T
swi t c
h
,
S181,
h
as
b
een added
i n
t h e
C
h
annel
2
Q64
an
d
Q74
ar e
connect e
d
as
±
common- emi t t er
p
h
ase
ci r c
u
i t
.
T
h
i s
swi t c
h
al l ows
t
h
e
out p
ut
si gnal
f r om
t
h
e
P
ar a-
i nver t er
(
p
ar a
p h
ase
ampl i f i er )
t o
conver t
t
h
e
si
n
gl e- en
d
e
d
p
h
ase
Am
p
l i f i er
t o
b
e connect e
d
t o
ei t
h
er
emi t t er
of
t
he

Table of Contents

Other manuals for Tektronix 454A

Preview: Operator's Handbook
Operator's Handbook20 pages

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Tektronix 454A and is the answer not in the manual?

Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

Related product manuals