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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
Wh
en
t
h
e
emi t t er
vol t age of
Q215
r eac
h
es
±
l evel
sl i g
h
t l y
mor e
negat i ve
t
h an
i t s
base,
Q215
con
d
uct s
.
I t s
col l ect or
l evel
goes negat i ve an d
p
ul l s t
h
e
base
of
Q225
negat i ve
t
h
r ou
g
h
di vi
d
er
R
215-
R
226
t o c
u
t
0225
of f
.
T
h
i s
swi t c
h
es
t
h
e
Di o
d e
Gat e
st age
t o
connect
t
h
e o
pp
osi t e
h
al f
t o
t
h
e
Del ay-
L
i ne
Dr i ver
st age
.
Agai n
C218
begi ns t o c
h
ar ge
t owar
d
- 12
vol t s,
b u
t t
h
i s
t i me
t
h
r ou
g
h
R
229
.
T
h
e emi t t er
of
0225
sl owl y
goes
negat i ve
as
C218
c
h
ar ges,
unt i l
0225
t
u
r ns on,
Q215
i s
s
hu
t
of f
a
n
d
t
h
e cycl e begi ns
agai n
.
Di o
d
es
C
R
218
an d
CR
228
ar e
pr event e
d
f r om
con-
A
MPL
I
F
I
ER
duct i ng
b y
C
R
234
an d
R
234,
w
h
i c
h
ef f ect i vel y
r emove
t
h
em
f r om
t
h
e
ci r c
u
i t
i n
t
h
e
C
H
O
P
mo
d
e
.
Q253
op
er at es
Gener al
t
h
e
same
i n t
h
e
C
H
O
P
mo
d e
as
i n
A
L
T
t o
al l ow
t
h
e
Di o
d
e
T
h
e
V
er t i cal
O
u
t
p
u
t
Am
p
l i f i er
ci r cui t
p
r ovi
d
es
t
h
e
f i nal
Gat es
t o
be swi t c
h
ed wi t
h
±
mi ni m
u
m
am
p
l i t
u
d e swi t c h
i ng
ampl i f i cat i on
f or
t
h
e
ver t i cal
d
ef l ect i on
si gnal
.
T
h
e
si gnal
l evel
.
BANDWI DTH- BEAM
F
I
N
D
ER
swi t c
h
p
r ovi
d
es
b an d
wi
d
t
h
l i mi t i ng
i n t
h
e
up
p
osi t i on,
and
com
p
r esses
an
over scanned
T
he
C
h
o
p
pe d
B
l an
k
i ng
Am
p
l i f i er
st age,
Q244,
p
r ovi
d
es
d
i s
p
l ay
wi t
h
i n
t
h
e
vi ewi ng
ar ea
i n t
h
e d
own
posi t i on
.
T
h
i s
an
out
pu
t
p
ul se
t o
t
h
e
–
Axi s
Am
p
l i f i er
ci r cui t
w
h
i c
h
am
p
l i f i er i s
uni
q ue
i n t
h
at
many
of
t
h
e
com
p
onent s
ar e
an
bl an
k
s
out
t
h
e
t r ansi st i ons
bet ween
t
h
e
C
h
annel
1
and
t
h
e
i nt egr al
p
ar t
of
t
h
e
ci r cui t
boar d
or
ar e
± p
ar t
of
t
h
e
t
h
i c
k
C
h
annel
2
t r ace
.
Wh
en
t
h
e
Swi t c
h
i ng
M
ul t i vi
b
r at or
st age
f i l m
et c
h
ed
ci r c
u
i t
ry use
d
i n t
h
e
Out
p
u
t
Push- Pul l
Am
p
l i -
c
h
anges
st at es,
t
h e vol t age
acr oss
¤
240
moment ar i l y
i n-
f i er
.
T
h
ese
par t s
ar e
i n
d
i cat e
d
on
t
h
e
d
i agr am
by
an
cr eases
.
‘
negat i ve p
ul se
i s
a
pp
l i e
d t o
t
h
e
base
of
Q244
t o
ast er i s
k
.
F
i g
.
3- 7
s
h
ows
±
det ai l ed
bl oc
k d
i agr am
of
t
h
e
t ur n
i t
of f
.
T
h
e
wi
d
t
h of
t
h
e
pu
l se
at
t
h
e b
ase
of
Q244
i s
V
er t i cal
O
u
t
p
u
t
Am
p
l i f i er
ci r c
u
i t
.
‘
sc
h
emat i c
of
t
h
i s
d
et er mi ne
d b y
R
241
an
d
C241
.
Q244
i s
q
u
i c
k
l y
d
r i ven
i nt o
ci r c
u
i t i s
s
hown
on
d
i agr am
4 at
t
h
e
r ear
of
t hi s
man u
al
.
c
u
t of f
an
d
t
h
e p
osi t i ve- goi ng
o
u
t p
u
t
p
u
l se,
w
h
i c
h
i s
coi
n
ci -
d
ent
wi t
h
t r ace
swi t c
h
i ng,
i s
connect e
d t o
t
h
e
–
Axi s
Am
p
l i f i er
ci r cui t
t
h
r o
u
g
h
R
245
.
B
uf f er
Am
p
l i f i er
ADD
.
I n t
h
e
ADD
p
osi t i o
n
of
t
h
e
M
OD
E
swi t c h
,
t
h
e
Di ode
Gat e
st age
al l ows b ot
h
si gnal s
t o p
ass
t o
t
h
e Del ay-
L
i ne
Dr i ver
st age
.
T
h
e
Di o
d
e
Gat es
ar e
bot
h h
el
d
on
by
- 12
vol t s
a
pp
l i e
d
t o
t
h
ei r
cat
h
o
d
es
t
h
r ou
g
h
R
270
an d
R
280
.
Si nce
bot h
si gnal s
ar e
a
pp
l i e
d
t o
t
h
e Del ay-
L
i ne
Dr i ver
st age,
t
h
e
o
u
t
p
u
t
si gnal
i s
t
h
e
al ge
b
r ai c
s
u
m
of
t
h
e
si gnal s
on
bot
h
C
h
annel s
1
an
d
2
.
Del ay-
L
i ne
Dr i ver
O
u
t
p
u
t
of
t
h
e
Di o
d
e
Gat e
st age
i s
a
p
p
l i e
d
t o
t
h
e
Del ay-
Am
p
l i t u
d
e
Com
p
ensat i on
N
et wor
k
L
i
n
e
Dr i ver
st age,
Q274
and
Q284
.
Q274
an d
Q284
ar e
connect e
d
as
f ee
d
b
ac
k
am
p
l i f i er s
wi t
h
R
276
an d
R
286
T
h
e
Am
p
l i t ude
Com
p
ensat i on
N
et wor
k
L
318-
R
318
p
r ovi
d
i ng f ee
d
bac
k
f r om
t
h
e
col l ect or
t o
t
h
e b
ase
of
t
h
e
L
R
318-
L
R
319- L41
8- L
R
418-
L
R
419-
R
417-
R
418-
R
419
r es
p
ect i ve
t r ansi st or
.
O
u
t
p ut of
t
h
e
Del ay-
L
i ne
Dr i ver
st age
connect ed
b
et ween
t
h
e bases
of
Q324- Q424,
p
r ovi
d
es
±
i s
connect e
d
t o
t
h
e
V
er t i cal
Out
p
u
t
Am
p
l i f i er t
h
r oug
h
t
h
e
gr a
d
ual
boost
i n
gai n
wi t
h
i ncr easi ng
f r e
qu
ency
t o
com
p en
Del ay
L
i ne
.
sat e
f or
s
k
i n- ef f ect
l osses
i n t
h
e
Del ay
L
i
n
e
.
R
417
an
d
R
419
ar e
ad
j
ust a
b
l e
t o p
r ovi
d
e
o
p t i m
u
m
com
p ensat i on
f or
t
h
e
Del ay
L
i ne
l osses
.
N
or mal
Tr i gger
P
i c
k
of f
E
mi t t er
F
ol l ower
Del ay
L
i ne
T
h
e
Del ay
L
i ne
p
r ovi des
a
pp
r oxi mat el y
120
nano-
seconds
d
el ay
f or
t
h
e
ver t i cal si gnal
t o al l ow
t
h
e
Swee
p
Gener at or
ci r cui t s
t i me
t o
i ni t i at e
±
swee
p
bef or e
t
h
e
ver t i -
cal
si gnal
r eac
h
es
t
h
e
ver t i cal
d
ef l ect i on
p
l at es
.
T
h
i s
al l ows
t
h
e
i nst r
u
ment
t o
d
i s
p
l ay
t
h
e
l ea
d
i ng
e
d ge of
t
h
e
si gnal
or i gi nat i ng
t
h
e
t r i gger
pu
l se
w
h
en
usi ng
i nt er nal
t r i gger i ng
.
VER
TI CA
L
OUT
PU
T
T
he
Bu
f f er
Am
p
l i f i er
st age,
0314
an d
0414,
p
r ovi
d
es
±
l ow
i n
p
u
t
i m
p
e d
ance
f or
t
h
e
V
er t i cal
O
u
t
p
u
t
Am
p
l i f i er ci r -
cui t
.
I t
al so
s
u
pp
l i es ±
cur r ent
d
r i ve
t o
t
h
e
Am
p
l i t
u d
e
Com-
p
ensat i on
N
et wor
k
.
C307
an
d
R
307
i n t
h
e
emi t t er
of
Q314,
an d
C407
and
R
407
i n t
h
e emi t t er of
Q414,
p
r ovi
d
e
f or war
d
t er mi nat i on
f or
t
h
e
Del ay
L
i ne
.
L
308
and
R
308
bet wee
n
t
h
e
emi t t er s of
Q314
an
d
Q414
p
r ovi
d
e
±
met
h
o d
of
t
h
er mal
comp
ensat i on
w
h
er eby
Q314
an d
Q414
gener at e
an
e
qu
al
an d
op
p
osi t e
t
h
er mal
d
i st or t i on
f r om
t
h
at
gener -
at e
d by
Q374
an d
Q474
.
T
h
e Tr i gger
si gnal
f or
N
O
RM
t r i gger
o
p
er at i on
i s
ob-
Push- Pul l
Ampl i f i er
St ages
t ai ne
d
f r om
t
h
e
col l ect or
of
Q274
t
h
r oug
h
emi t t er
f ol l ower
Q293
.
T
h
e
N
or mal
Tr i gger
DC
L
evel
a
d
j
ust ment ,
R
272,
set s
Gener al
.
T
h
e
12
t r ansi st or s
f ol l owi ng
t
h
e
Bu
f f er
Am
p
l i -
t
h
e
DC
l evel
of
t
h
e
nor mal
t r i gger
o
u
t
p ut
si gnal
so
t
h
e
f i er
st age
f or m
t
h
r ee
si mi l ar ,
f o
u
r - t r ansi st or
am
p
l i f i er
st ages
.
swee
p
i s
t r i gger e
d
at
t
h
e
zer o- vol t
l evel
of
t
h
e d
i s
p
l aye
d
F
i g
.
3- 8
s
h
ows
± si m
p
l i f i e
d
ci r cui t
of
t
h
e
basi c
push- pul l
si gnal
w
h
en
t
h
e Tr i gger i ng
LEVEL
cont r ol
i s
set
t o
0
.
T
h
e
am
p
l i f i er
conf i g
u
r at i on
.
T
h
e
cur r ent
gai
n
( i i
n
/ l
ou
t )
i s
nor mal
t r i gger
si gnal
i s
connect e
d
t o
t
h
e Tr i gger
P
r eam
p
sl i g
h
t l y
l ess
t
h
an
t
h
e
r at i o
of
R
s t o
Re
.
T
h
e
conf i g
u
r at i on
ci r cui t
t
h
r o
u
g
h R
294- C294
a
n
d
S238
B
.
u
se
d
f or eac
h
of
t
h
ese
push- pul l
am
p
l i f i er
st ages
p
r ovi
d
es
±
3-
1
0

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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