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Tektronix 454A User Manual

Tektronix 454A
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Ci r cui t
Descr i
p
t i on- 454zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
‘
/
R
454A
Out
p
ut
Am
p
l i f i er
3-
36
q
ui c
k
l y
t ur n
t
h
e d
i s
p
l ay
of f
.
T
h
e
out
p ut
unbl an
k
i ng
gat e
at
t
h
e
emi t t er
of
Q1343
i s
connect e
d t o
t
h
e
C
R
T
ci r c
u
i t
t
h
r o
u
g
h
R
1344
.
T
h
e
r esul t ant
si gnal
p r od
u
ced
f r om
t
h
e
var i o
u
s
i n
p
ut s
by
t
h
e
I n
p ut
Am
p
l i f i er
st age
i s
connect ed
t o
t
h
e base of
Q1324
t
h
r oug
h
C1324, and
t
h
e
base
of
Q1334
t
h
r oug
h
R1330
.
T
h
ese
t r ansi st or s
ar e
connect e
d
as
±
col l ect or -
cou
p
l e
d
com
p
l ement ar y
am
p
l i f i er
.
T
h
i s
conf i g u
r at i on
pr ovi des
±
l i near ,
f ast
out
p
ut
si gnal
wi t
h
mi ni m
u
m
q u
i es-
cent
p
ower
.
T
h
e
C
R
T
Ci r c
u
i t
p
r ovi
d
es
t
h
e
h
i g
h
- vol t age
an
d
cont r ol
ci r c
u
i t s
necessar y f or o p
er at i on
of
t
h
e
cat
h
o
d
e- r ay
t
u be
T
h
e
over al l
–
Axi s
Am
p
l i f i er
ci r c
u
i t i s
±
s
hu
nt - f ee
d
bac
k
( C
R
T)
.
F
i g
.
3- 20
s
h
ows
± d
et ai l e
d b
l oc
k
d
i agr am
of
t
h
e
oper at i onal
ampl i f i er
wi t
h
f eed
b
ac
k
connect e
d
f r om
t
h
e
C
R
T
Ci r c u
i t
.
‘
sc
h
emat i c
of
t
h
i s
ci r cui t
i s
s
hown
on
d
i a
Out
p
ut
Am
p
l i f i er
st age
t o
t
h
e
I n
p
u
t
Ampl i f i er
st age
gr am 17
at
t
h
e bac
k
of
t
h
i s
man
u
al
.
t
h
r o
u
g
h
C1351- C1352-
R
1351
.
T
h
e
out
p
u
t
vol t age
i s
d
et er -
mi ne
d b y
t
h
e i n
p
u
t
cur r ent
§
t
h
e f ee
d
bac
k
r esi st or
an
d
i s
s
hown
by
t
h
e
f or m
u
l a
:
E
o
u
t
=
i i n
§
R
FB
wher e
R
1351
i s
H
i g
h
- Vol t age
Osci l l at or
R
FB
.
T
h
e
‘
and
’
unbl an
k
i ng
i n
p
u
t
cur r ent
c
h
ange
i s
Q1430
an d
associ at ed
ci r cui t r y
com
p
r i se
±
cl ass
C
osci l -
a p
p
r oxi mat el y
t wo
mi l l i am
p
er es
.
T
h
er ef or e,
t
h
e
maxi mum
l at or
t o pr od
u
ce
t
h
e
dr i ve
f or
t
h
e
h
i g
h
- vol t age
t r ansf or mer ,
out
p ut vol t age c
h
ange
i s a
b
out
60
vol t s
( 2
mA
§ 30
. 1
k
©
)
.
¤
1430
.
Wh
en
t
h
e
i
n
st r
u
ment
i s
t
u r ne
d
on,
t
h
e cur r ent
C1352
a
d
j u
st s
t
h
e
f eed
b
ac
k
ci r c
u
i t
f or
o p
t i m
u
m
st e
p
r es-
t hr ough
R
1425
c
h
ar ges
C1419
p
osi t i ve,
an
d
01430
i s
f or -
p
onse,
so
t
h
e
u
nbl an
k
i ng
gat e
si gnal at
t
h
e
out
p ut of
t
h
i s
war d
bi ase
d
.
T
h
e
col l ect or
cur r ent
of
Q1430
i ncr eases
and
±
ci r c
u
i t
h
as
±
f ast
r i se
wi t
h
mi ni mum
over s
h
oot
or
r i ngi ng
.
vol t age
i s
devel o p ed
acr oss
t
h
e
col l ect or
wi n
d
i ng
of
¤
1430
.
Over s
h
oot
or
r i ngi ng
on
t
h
e
unbl an
k
i ng
gat e
woul d
p
r o
d
uce
T
h
i s
pr o
du
ces
±
cor r es
p
on
d
i ng
c
u
r r ent
i ncr ease
i n
t
h
e
f ee
d
-
±
d
i s
p
l ay
wi t
h u
neven
i nt ensi t y
i mmedi at el y
f ol l owi ng
bac
k
wi n
d
i ng
of
¤
1430
w
h
i c
h
i s
connect e
d t o
t
h
e base
of
su
dd en
c
h
anges
i n
bl an
k
i ng
l evel
.
Q1430,
an d
t
h
i s
f ee
d
bac
k
cur r ent
i ncr eases
t
h
e
vol t age
l evel
at
t
h
e
b
ase
of
Q1430
.
Wh
en
C1419
i s
f ul l y
c
h
ar ged
,
t
h
e
base
cur r ent
of
01430
st abi l i zes
and
t
h
er e
i s
no
c
h
angi ng
T
h
e emi t t er vol t age f or
Q1324
i s
c
h
anged
by
t
h
e
H
O
R
I Z
cur r ent
i n t
h
e
col l ect or
wi n
d
i ng
of
¤
1430
.
Si nce
t
h
er e
i s
no
DI S
PL
AY
swi t c
h
,
S1001A,
an d
t
h
e
‘
¤™œ•
/ DI
V
swi t c
h
,
change
i n
cur r ent
t
h
r o
u
g h
t
he
col l ect or
wi n
d
i ng,
t
h
er e
i s
no
f ee
d
bac
k
vol t age t o
t
h
e
base,
an
d
t
h
e
col l ect or
cur r ent
of
S750A,
t o pr event
ph
os
ph
or
bur ni ng
.
Wh
en
t
h
e
H
O
R
I Z
Q1430
b
egi ns
t o
decr ease
.
T
h
i s
pr od
u
ces
±
cur r ent
i n
t
h
e
DI S
PL
AY
swi t c
h
i s
set
t o
’ ( D
EL
AY
E
D
S
WEEP)
or
§
-
¥
,
f ee
d
bac
k
wi n
d
i ng
of
¤
1430
an d ± cor r es p
on
d
i ng
negat i ve
+150
vol t s
i s
connect ed
t o
t
h
e emi t t er
of
Q1324
t
h
r oug
h
vol t age
( l ess
p
osi t i ve)
at
t
h
e
base of
Q1430
w
h
i c
h begi ns
t o
C
R
1326-
R
1326-
R
1327
.
C
R
1353
i s
r ever se
b
i ase
d
an
d
t
he
t ur n
i t
of f
.
C1419
sl owl y
d
i schar ges
t o
t
h
e
negat i ve pot en-
+75
vol t s
at
i t s
ano
d
e
i s
d
i sconnect e
d
f r om
t
h
e
ci r cui t
.
t i al
on
t
h
e b
ase
of
Q1430
.
Once
agai n,
t
h
e cur r ent
f l ow
H
owever ,
i n t
h
e
‘
,
‘
™• ¤• •
D
UR
I
N
G ’
an d
M
I X
E
D p
osi -
t hr ough
t
h
e
col l ect or
wi ndi ng
ceases
an
d
t
h
er e
i s
no
f eed-
t i ons
of
t
h
e
H
O
R
I Z
DI S
PL
AY
swi t c h
,
t
h
e emi t t er so
u
r ce
back
t o
t
h
e b
ase
of
Q1430
.
T
h
en
C1419
b
egi ns
t o
r ec
h
ar ge
f or
Q1324
i s
d
et er mi ne
d by
t
h
e
‘
¤™œ•
/ DI
V
swi t c
h
.
I n
t
h
e
t hr ough
R
1425,
an d
t
h
e
base
l evel
of
Q1430
r i ses
p
osi t i ve
. 1
s
t o 5
s
p
osi t i ons
of
t
h
e
‘ ¤
1
ϥ
/ DI
V
swi t c
h
, t
h
e emi t t er
unt i l
i t i s
f or war d
bi ase
d
.
Q1430
r et ur ns
t o
conduct i on
and
of
Q
1
324
s
r et ur ne
d
t o
+75
vol t s
t
h
r o u
g
h
anot
h
er
cycl e
begi ns
.
T
h
e
si gnal
p
r o
d
uce
d
acr oss
T1430
i s
±
C
R
1326-
R
1326-
R
1327
an
d
CR
1353
.
T
h
i s
l ess
p
osi t i ve
si ne
wave
wi t
h
±
f r e
q
uency
of
40
t o
50
k
i l o
h
er t z
.
T
h
e
emi t t er
sou
r ce f or
Q1324
l i mi t s
t
h
e
col l ect or
l evel
of
Q1324
an d
Q1334
t o
a
b
o
u
t
+75
vol t s
t o
p
r ot ect
t
h
e
C
R
T
am
p
l i t u
d e of
t
h
e
osci l l at i ons
at
t
h
e
col l ect or
of
Q1430
i s
ph
osp
h
or
i n t
h
ese
swi t c
h
p
osi t i ons
. I
n
t
h
e . 02
¼
s
t o
50 ms
cont r ol l ed
by
t
h
e
H
i g
h
-
V
ol t age
R
egul at or
st age
.
p
osi t i ons,
t
h
e emi t t er
sour ce
f or
Q1324
i s
+150
vol t s
.
O
p
er at i on
i s
t
h
e
same
as i n
t
h
e
’ ( D
EL
AY
E
D
S
WEEP)
an
d
¥
posi t i ons of
t
h
e
H
O
R
I Z
DI S
PL
AY
swi t c
h
.
F
use
F
1437
p
r ot ect s
t
h
e
+12-
V
ol t
Su pp
l y
i f
t
h
e Hi gh-
X-
Y
Osci l l at or
st age
i s
s
h
or t ed
.
F
i l t er
net wor
k
L
1437- C1437
pr event s cur r ent
c
h
anges
i n t
h
i s
st age
f r om
Zener
d
i o
d
e
VR
1356
connect e
d
bet ween
+75
vol t s
and
af f ect i ng
t he
+12- vol t
r eg
u
l at or
ci r c
u
i t
.
Gener al
C
R
T
CI
R
C
U
I T
+150
vol t s
t
h
r ou
g
h
C
R
1357-
R
1357-
R
1358
p r od
u
ces
±
+100- vol t
l evel
at
t
h
e
cat hode
of
VR
1356
.
T
h
i s
vol t age
Hi gh- Vol t age
R
egul at or
est a
b
l i s
h
es
t
h
e cor r ect op
er at i ng
l evel
f or
t
h
e
Geomet r y
ad-
j
ust ment
i n t
h
e
C
R
T
Ci r cui t an
d
est abl i s
h
es
t
h
e cor r ect
F
ee
d
bac
k
f r om
t
h
e
secon
d ar y
of
¤
1430
i s
connect e
d
t o
col l ect or
l evel
f or
Q1343
.
C
R
1343,
connect e
d
f r om
b
ase
t o
t
h
e base of
Q1414
t
h
r o
u
g
h
t
h
e
vol t age
d
i vi der
net wor
k
emi t t er of
Q1343,
i mp r oves
t
h
e
r es
p
onse
of
Q1343
t o
R
1405-
R
1412
.
T
h
i s
sam
p
l e
of
t
h
e
o
u
t
p
u
t vol t age
i s
am
p
l i -
negat i ve- goi ng
si gnal s
.
Wh
en
t
h
e
base of
Q1343
i s
d
r i ven
f i ed
b
y
Q1414
an
d
01413,
an d
app
l i e
d
t o
t
h
e b
ase
of
negat i ve t o c
u
t of f ,
C
R
1343
i s
f or war
d
bi ase
d
an
d
con
d uct s
Q1423
.
Ampl i t u
d
e
of t
h
e
osci l l at i o
n
s
at
t
h
e
col l ect or
of
t
h
e
negat i ve- goi ng p
or t i on
of
t
h
e u
nbl an
k
i ng
si gnal
.
T
h
i s
Q1430
i s
d
et er mi ne
d
by
t
h
e
aver age
DC
l evel
at
t
h
e
emi t t er
p r ovi des ±
f ast
f al l i ng
ed ge
on
t
h
e
u
nbl an
k
i ng
gat e
t o
of
Q1423
.

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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