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Tektronix 454A User Manual

Tektronix 454A
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Ge
n
er at or
ci r c
u
i t
.
T
h
er e
i s
no
A
u
t o Tr i gger
st age
i n t
h
ezyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Swee
p
Gener at or
i s
t ur ne
d on,
an
d
t
h
e
di s
p
l ay
i s
p
r esent e
d
Tr i gger
Gener at or
ci r c
u
i t
;
t
h
er ef or e,
t
h
er e
i s
no
nee
d
f or
an
at
±
swee
p
r at e
det er mi ne
d
b y
t
h
e
set t i
n
g
of
t
h
e
A
u
t o
Pu
l se
Am
p
l i f i er
or
I sol at i on
Am
p
l i f i er
st age
.
T
h
e
¤™œ
/ DI
V
swi t c h
.
o u
t
p
u
t
f r om
t
h
e
secon
d ar y of p
ul se
t r ansf or mer
¤870
i s
a
pp
l i e
d t o
t
h
e
Swee
p
Gener at or
ci r c
u
i t
t
h
r ou
g
h
C871
.
Q996A
an
d
ar e
connect e
d as
±
vol t age
com
p
ar at or
.
I
n
t
h
i s
conf i gur at i on,
t
h
e
t r ansi st or
wi t
h
t
h
e
most
posi t i ve
S
WEEP
G
ENER
ATO
R
base cont r ol s
cond
u
ct i on
.
dual
t r ansi st or ,
Q996,
and
±
d
ual
d
i o
d
e,
C
R
995,
p
r ovi de
t em
p
er at ur e
st abi l i t y
f or
t
h
e
Gener al
com
p
ar at or
ci r c
u
i t
.
0998
mai nt ai ns
±
const ant
c
u
r r ent
T
h
t
h
r oug
h
t
h
e
cond
u
ct i ng
t r ansi st or
.
R
ef er ence
vol t age
f or
e
Swee
p
Gener at or
ci r c
u
i t i s
basi cal l y
t
h
e
same
as
t
h
t he
com
p
ar at or
ci r cui t
i s
p
r ovi
d
e
d
by
t
h
e
DELAY- TI ME
e
Swee
p
Gener at or
ci r c
u
i t
.
Onl y
t
h
e
d
i f f er ences
M
U
L
TI
PL
I
ER
cont r ol ,
R
997
.
T
h
e
vol t age
t o
t
h
i s
cont r ol
i s
bet wee
n
t
h
e
t wo
ci r c
u
i t s
ar e
d
i scusse
d
h
er e
.
T
h
e
f ol l owi ng
f i l t er ed
by
R
946- C946
t o
r emove
t r ansi ent
noi se
vol t ages
ci r cui t s
o
p
er at e
as
d
escr i be
d
f or
t
h
e
Swee
p
Gener at or
( cor r es
p
on
d
i ng
ci r cui t
numb
er s
assi gne
d
i n t
h
e
900- 999
an
d
al l ow
p
r eci se
d
el ay
p
i c
k
of f
.
T
he
i nst r
u
ment
i s
cal i br at e
d
so
t
h
at
t
h
e
ma
j
or
d
i al
mar
k
i ngs
of
R
997
r ange)
:
Swee
p
Gat e ( C
R
902,
Q904) ,
Di sconnect
Am
p
l i f i er
cor r es
p
on
d
t o
t
h
e
ma
j
or d
i vi si ons
of
h
or i zont al
d
ef l ect i on
( Q919) ,
Sawt oot
h
Swee
p
Gener at or
( 0921,
0925) ,
an d
t
h
e
on
t
h
e
gr at i cul e
.
F
or
exam
p
l e,
i f
t
h
e
DELAY- TI ME
Swee
p R
eset
E
mi t t er
F
ol l ower
( Q938
B
) .
F
i g
.
3- 15
s
h
ows
±
M
U
L
TI
PL
I
ER
d
i al
i s
set
t o 5
. 00,
t
h
e
Swee
p
Gener at or
d
et ai l e
d
bl oc
k d
i agr am
of
t
he
Swee
p
Gener at or
ci r cui t
.
enabl e
pu
l se
i s
d
el aye
d
an
amo
u
nt of
t i me
e
qu
al
t o
f i ve
sc
h
emat i c
of
t
h
i s
ci r cui t
i s
s
hown
on
d i agr am 9
at
t
h
e bac
k
d
i vi si ons
of
t
h
e
swee
p bef or e
i t
can
p
r o
d
uce
±
swee
p
( f or
of
t
h
i s
manual
.
t
h
i s
exam
p
l e,
swee
p
del ay
t i me
e q
ual s
f i ve
t i mes
t
h
e
Out
p
ut
Si gnal
Am
p
l i f i er
set t i ng
of
t
h
e
TI
œ
/ DI
V
swi t c
h
)
.
B
asi cal l y,
t
h
e
O
u
t
p u
t
Si gnal
Am
p
l i f i er
i s
t
h
e
same
as
T
h
e
o
u
t
p
u
t
Sawt oot
h
f r om
t
h
e
Sawt oot
h
Swee
p
t
h
e
cor r es
p
on
d
i ng
ci r c
u
i t
i n t
h
e
Swee
p
Gener at or
ci r cui t
.
Gener at or
st age
i s
connect e
d
t o
t
h
e b
ase
of
Q996A
.
T
h
e
I n
t
h
e
,
M
I X
E
D,
and
§
-
¥
p
osi t i ons
of
t
h
e
H
O
R
I Z
q
u
i escent
l evel
of
t
h
e
Sawt oot
h
bi ases
Q996A
on,
an d
i t s
DI S
PL
AY
swi t c
h
,
t
h
e
u
nbl an
k
i ng
p
ul se
i s
bl oc
k
e
d
,
si nce
col l ect or
i s
negat i ve
enoug
h
t o
h
ol
d
Q984
i n t
h
e
Del ay
t
h
er e
i s
no
f or war
d
bi as
vol t age a
pp
l i e
d
t o
C
R
907
or
Mu
l t i vi
b
r at or st age
i n
con
d
u
ct i on
.
As
t
h
e
swee
p
out
p ut
C
R
908
.
I n
t he
A
¤•
D
UR
I
N
G
an
d
t
h
e
( D
EL
AY
E
D
Sawt oot
h
goes
negat i ve,
t
h
e base of
Q996A
al so
goes
S
WEEP)
p
osi t i ons,
cur r ent
i s
connect e
d t o
t
h
e
ano
d
es
of
negat i ve
.
Wh
en
i t
goes
mor e
negat i ve
t
h
an
t
h
e
l evel
at
t
h
e
C
R
907
an
d
C
R
908
t
h
r oug
h R
949
or
R
950
.
Wh
en
t
he
base
of
Q996
B
( est abl i s
h
ed
by
t
h
e
DELAY- TI ME
Swee
p
Gat e
st age
i s
i n i t s
l ow- vol t age
st at e,
t
h
i s
c
u
r r ent
MUL
TI
PL
I
ER
cont r ol ) ,
Q996
B
t a
k
es
over
con
d
u
ct i on of
f l ows
t
h r ou
g
h
C
R
908
t o
t
h
e
Axi s
Am
p
l i f i er
ci r c
u
i t
t
h
e
compar at or
an
d
Q996A
s
h
ut s
of f
.
T
h
i s
al so
swi t c
h
es
t
h
e
( t
h
r oug
h
t
h
e
Swee
p
Gener at or
ci r cui t )
an
d
t
h
e
C
R
T
i s
Del ay
Mu
l t i vi br at or
st age
t o p
r o
d
uce
t
h
e d
esi r e
d
bl an
k
ed
.
Wh
en
t
h
e
Swee
p
Gat e
st age
swi t c h
es t o
i t s
negat i ve- goi ng
r eset
p
ul se
t o
t
h
e
Sweep
R
eset
h
i g
h
- vol t age
st at e
at
t
h
e
st ar t
of
swee
p
,
t
h
e
col l ect or
of
M
ul t i vi br at or
.
Dur i ng
t
h
e
swee
p r ecover y,
Q996A
i s
agai n
Q910
goes
negat i ve
.
T
h
i s
f or war
d b
i ases
C
R
907
an d
t
h
e
r et
u r ne d
t o
con
d u
ct i on
an d
Q996
B
i s
t ur ne d
of f
( Q984
i s
b
l an
k
i ng
cur r ent
i s
d
i ver t ed
f r om
C
R
908
t
h
r oug
h
CR
907
.
al r eady
t ur ned
on
by
d
el ayed
swee
p
l oc
k
out
gat e
f r om
t
h
e
C
R
908
i s
r ever se
b
i ase
d
an
d
t
h
e
C
R
T
i s
u
n
b
l a
nk
ed t o
al l ow
Swee
p
Gener at or
at
t
h
e
en
d of
t
h
e
swee
p
)
.
t
h
e
swee
p t o b e
d
i s
p l aye
d
.
F
or
¤•
D
UR
I
N
G
o
p
er at i on,
t
h
e
C
R
T d
i s
p
l ay
i s
p
ar t i al l y
unbl an
k
e
d
d ur i ng
swee
p
t i me
an
d
f ur t
h
er
u
nbl an
k
e
d
d
u
r i ng
swee
p
t i me
( see
Del ay
M
ul t i vi br at o
r
t
h
e
Swee
p
Gener at or
d
i sc
u
ssi on)
.
I n
t
h
e
( D
EL
AY
E
D
T
h
e
Del ay
M
ul t i vi br at or ,
Q984
and
Q986,
cont r ol s
t
h
e
S
WEEP)
p
osi t i on,
t
h
e
u
n
b
l an
k
i ng
p
ul se
i s
b
l oc
k
e
d
( see
st at e
of
t
h
e
Sweep
R
eset
M
ul t i vi br at or
and
t
h
e
M
i xe
d
O
u
t
p
ut
Si gnal
Am
p
l i f i er
d
i sc
u
ssi on)
.
I n
t
h
e
M
I X
E
D
Sweep
B
l an
k
i ng
Mu
l t i vi
b
r at or
.
I t
l oc
k
s
o u
t t
h
e
Sweep
p
osi t i on,
t
h
e
C
R
T
d
i s
p
l ay
i s
p
ar t i al l y
u
nbl an
k
e
d
at
t
h
e
st ar t
Gener at or
u
nt i l
i t i s
swi t c h
e
d b y
t
h
e
Del ay-
P
i c
k
of f
Com
p
ar -
of
t
h
e
swee
p
t i me
a
nd
i s
f ur t
h
er u
nbl an
k
ed
at
t
h
e
st ar t
of
at or
.
Tr ansi st or s
Q984
an d
Q986
ar e
connect e
d
as
±
t
h
e
swee
p
t i me
.
At
t
h
e
en
d
of
t
h
e
swee
p
t i me
t
h
e
C
R
T
Sc
h
mi t t
b
i st a
b
l e
m
u
l t i vi
b
r at or
.
Q
u
i escent l y,
Q984
i s
h
el
d
d
i s
p
l ay
i s
com
p
l et el y
b
l an
k
ed
( see
M
i xe
d
Swee
p B
l an
k
i ng
on
by
t
h e
negat i ve
l evel
at
t
h
e
col l ect or
of
Q996A
an
d
M
ul t i vi br at or
d
i scussi o
n
)
.
0986
r emai ns
of f
.
T
h
e
ci r cui t
r emai ns
i n t
h
i s
con
d
i t i on
unt i l
t
he
i ncomi ng
swee
p swi t c
h
es
t
h
e
Del ay-
P
i c
k
of f
Del ay-
P
¯
c
k
of f
Com
p
ar at or
Com
p
ar at or
( see
Del ay-
P
i c
k
of f
Com
p
ar at or
d
i sc
u
ssi on)
.
T
h
en
t
h
e
base of
0984
goes p
osi t i ve
an
d
i t
t
u
r ns
of f
.
At
t
h
e
T
h
e Del ay-
P
i c
k
of f
Com
p
ar at or st age
al l ows
sel ect i on
of
same
t i me,
t
h
e
base
of
Q986
i s
p
ul l e
d negat i ve by
t
h
e
col -
t
h
e
amou
nt
of
del ay
f r om
t
h
e
st ar t
of
t
h
e
swee
p b ef or e
l ect or
l evel
of
¿
996
an d
i t
t
u
r ns
on
.
T
h
e
col l ect or
of
t
h
e
Swee
p
Gener at or
i s
t
u
r ne d
on
.
T
h
i s
st age
al l ows
t
h
e
Q984
goes
negat i ve
an d
±
negat i ve- goi ng o
u
t
p
ut
p
u
l se
i s
st ar t
of
sweep
t o b
e
d
el aye
d b
et ween
0
. 10 an d
10
. 10
co
up
l e
d
t o
t
h
e
Swee
p
R
eset
M
ul t i vi br at or
st age
and
t
h
e
t i mes
t
h
e
set t i ng
of
t
h
e
¤™œ
/ DI
V
swi t c
h
.
T
h
en,
t
h
e
M
i xe
d
Swee
p
B
l an
k
i ng
Mu
l t i vi br at or
st age
t
h
r oug
h
C983
.
Ci r cui t
Descr i
p
t i on- 454
/
R
454A
3-
25

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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