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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
as
±
Sc
h
mi t t
bi st a
b
l e
m
u
l t i vi br at or
.
Qui escent l y,
at
t
h
e
st ar t
t
h
e
‘
swee
p
al so
.
Si nce
t
h
e
‘
swee
p
en d
s
i mmedi at el y
of
t
h
e
swee
p
,
Q774
i s
con
d
u
ct i ng
an
d
Q775
i s
bi ased
of f
t o
f ol l owi ng
t
h
e
en
d of t
h
e
’
swee
p
,
t
h
i s
p
osi t i on
p
r ovi
d
es
t
h
e
p
r o
d
u
ce ± negat i ve
l evel
at
i t s
col l ect or
.
T
h
i s
negat i ve
l evel
maxi mum
r e
p
et i t i on
r at e
( br i g
h
t est
t r ace)
f or
Del aye
d
al l ows
t
h
e
Swee
p
Gat e
t unnel d
i ode,
C
R
702,
t o
be swi t c h
e
d
Swee
p
mo
d e o p er at i on
.
t o pr od
u
ce ±
swee
p
as
d
i scusse
d
p
r evi ousl y
.
Wh
en
t
h
e
negat i ve- goi ng
swee
p
si gnal
i s
connect e
d
t o
t
h
e
b
ase
of
Q775
t
h
r oug
h
CR
761,
0775
i s
event
u
al l y
bi ase
d
on
an d
T
h
e
HF
STA
B
cont r ol ,
R
762,
var i es
t
h
e c
h
ar gi ng
r at e
of
Q774
i s
bi ase
d
of f
by
t
h
e
emi t t er
co
u
p
l i ng
bet ween
t
h
e
H
ol dof f
Ca
p
aci t or
t o p
r ovi
d e
±
st a
b
l e
d
i spl ay
at
f ast
Q774- Q775
.
T
h
e
col l ect or
of
0775
r i ses
p
osi t i ve
an
d
swee
p
r at es
.
T
h
i s
c
h
ange
i n
h
ol dof f al l ows
swee
p
sync
h
r oni -
C
R
702
i s
swi t c
h
ed
bac
k
t o
i t s
l ow- vol t age
st at e
t
h
r o
u
g
h
zat i on
f or
l ess
d
i spl ay
j
i t t er
at
t
h
e
f ast er
swee
p
r at es
.
T
h
i s
R
701
.
T
h
i s
t ur ns
Q704
an d
Q716
of f ,
an
d
Q724
an d
Q726
cont r ol
h
as
l i t t l e
ef f ect
at
sl ow
swee
p
r at es
.
on
t o
r a
p
i
d
l y
d
i sc
h
ar ge
t
h
e
Ti mi ng
Ca
p
aci t or
an d p r od
uce
t
h
e
r et r ace
p
or t i on of
t
h
e
sawt oot
h
si gnal
.
T
h
e
Sawt oot
h
Swee
p
Gener at or
st age
i s
now
r eady
t o
p
r o
d
uce
anot
h
er
L
oc
k
out
Gat e
Am
p
l i f i er
.
Q764
i s ±
cu
r r ent
swi t c
h
swee
p
,
as
soon
as
t
h
e
Swee
p
R
eset
Mu
l t i vi
b
r at or st age
i s
whi ch
i s
d
r i ve
n
by
t
h
e
col l ect or
si gnal
of
0775
t o
p
r o
d
uce
r eset
and
anot
h
er
t r i gger
p
ul se
i s
r ecei ve
d
.
t
h
e d
el aye
d
swee
p
l oc
k
out
gat e
.
T
h
i s
n
egat i ve- goi ng
gat e
at
t he
col l ect or
of
Q764
i s
connect e
d
t o
t
h
e
Del ay
M
ul t i -
vi br at or
st age
i n t
h
e
’
Swee
p
Gener at or
ci r cui t
t o
l oc
k
t
h
e
Wh
en
Q775
i s
t
u
r ned
on
t o en d
t
h
e
swee
p
,
i t
r emai ns
i n
’
Swee
p
Gener at or out
unt i l
t
h
e
‘
Swee
p
Gener at or
h
ol
d
-
con
d
uct i on
f or
±
p
er i o
d of
t i me
t o
est a
b
l i s
h
±
h
ol
d
of f
of f
p
er i o
d
i s
com
p
l et e
.
C
R
769
set s
t
h
e
emi t t er
vol t age of
p
er i o
d
an d
al l ow
al l
ci r c
u
i t s
t o
r et ur
n
t o
t
h
ei r
or i gi nal
0764
at
a
b
o
u
t
- 0
. 5
vol t
so
0764
t ur ns
on
w
h
en
i t s
b ase
i s
con
d
i t i ons
bef or e
t
h
e
next
swee
p
i s
p
r o
d
uce
d
.
T
h
e
h
ol
d
of f
above
zer o
vol t s
.
t i me
i s
d
et er mi ne
d
by
t
h
e c
h
ar ge
r at e
of
t
h
e
H
ol
d
of f
Ca
p
aci t or ,
C760
.
At
t
h
e
st ar t
of
t
h
e
swee
p
,
C760
i s
com-
L
am
p
Dr i ver
.
T
h
e
a
u
t o- gat e
l evel
f r om
t
h
e
A
u
t o
Mu
l t i -
p
l et el y
d
i sc
h
ar ged by
t
h
e u
nbl an
k
i ng
gat e
t
h
r o
u
g
h
t
h
e
vi br at or
st age
i n
t
h
e
‘
Tr i gger
Gener at or
ci r cui t
i s
µ¿·
-
H
ol
d
of f
Dr i ver ,
Q714
.
T
h
e
H
ol
d of f
Ca
p
aci t or
i s
h
el
d
at
t
h
i s
nect e
d
t o
t
h
e
L
am
p
Dr i ver
st age,
Q794,
t
h
r oug
h
C
R
794
l evel
t
h
r o
u
g
h
o
u
t
t
h
e
swee
p
t i me
.
T
h
en,
w
h
e
n
Q704
i s
an d
CR
795
.
T
h
i s
gat e
l evel
i s
coi nci
d
ent
wi t
h
t
h
e
t r i gger
t ur ne
d
of f ,
Q716
an
d
Q714
ar e
c
u
t
of f
.
C760
b
egi ns t o
p
ul se
gener at e
d
by
t
h
e
‘
Tr i gger
Gener at or
ci r cui t ,
and
i s
c
h
ar ge
t owar
d
+75
vol t s
t
h
r o
u
g
h
R
761,
R
762
an
d
R
763
.
pr esent
onl y
w
h
en
t
h
e
i nst r ument
i s
cor r ect l y
t r i gger e
d
.
T
h
e
p
osi t i ve- goi ng
vol t age
acr oss
t
he
H
ol
d
of f
Ca
p
aci t or
as
i t
The
p
osi t i ve- goi ng
aut o- gat e
l evel
at t
h
e base of
0794
d
r i ves
c
h
ar ges
i s
connect e
d t o
t
h
e
base of
Q775
t
h
r ou
g
h
C
R
763
Q794
i nt o
sat ur at i on
.
T
h
e
col l ect or
of
Q794
goes
negat i ve
an
d
VR
766
.
Wh
en
t
h
e b
ase
of
Q775
r i ses
p
osi t i ve
enoug
h
t o
abo
u
t
zer o
vol t s
and
t
h
e
‘
S
WEEP
T
R
I G' D
l i g
h
t ,
so
i t i s
r ever se bi ased,
i t s
col l ect or
l evel
dr o
p
s
negat i ve
an
d
DS793,
comes
on
.
T
h
i s
l i g
h
t
r emai ns
on
as
l ong
as
t
h
e
0774
comes
bac
k
i nt o
con
d
u
ct i on
.
T
h
e
b
i as
on
t
h
e
‘
a
u
t o- gat e
l evel
i s
p r esent
.
Wh
en
t
h
e
aut o- gat e
l evel
goes
Swee
p
Gat e
t unnel
d
i o
d
e,
C
R
702
r et ur ns
t o ±
l evel
t
h
at
negat i ve b
ecause
t
h
e
i nst r ument
i s
no
l onger
t r i gger e
d
,
al l ows
i t
t o
acce
p
t
t
h
e
next
t r i gger
p
ul se
( C
R
702
i s
C
R
793
cl am
p
s t
h
e
base
l evel
of
Q794
at
about
- 0
. 5
vol t
ena
b
l e
d
)
.
T
h
e
H
ol dof f
Cap
aci t or ,
C760,
i s
c h
ange
d
b
y
t
h
e
an d
Q794
i s
r ever se
bi ased
.
T
h
e
col l ect or
of
Q794
r i ses
‘
¤™œ•
/ DI
V
swi t c
h
f or
t
h
e
var i o
u
s
swee
p
r at es
t o p
r ovi de
posi t i ve
an
d
DS793
goes
of f
.
t
h
e
cor r ect
h
ol dof f
t i me
.
Di agr am
10
s
h
ows
±
comp
l et e
d
i agr am
of
t
h
e
‘
¤™œ•
/ DI
V
swi t c
h
.
As
t
h
e
‘
S
WEEP
LEN
GT
H
cont r ol
i s
r ot at ed
co
u
nt er -
O
p
er at i on
of
t
h
e
‘
Sweep
Gener at or
ci r cui t
i n
t
h
e
cl oc
k
wi se
f r om
t
h
e
FULL
p
osi t i on,
C
R
760
cont r ol s
t
h
e
A
U
TOT
R
I G posi t i on of
t
h
e
‘
S
WEEP
M
OD
E
swi t c h
i s
t
h
e
t
u
r n- of f
p
oi nt
of
t
h
e
Swee
p R
eset
Mu
l t i vi
b
r at or
at
±
l evel
same
as
f or
t
h
e
N
O
RM
T
R
I G
p
osi t i on
j u
st
d
escr i be
d
w
h
en
±
d
et er mi ne
d
by
t
h
e
set t i ng
of
R
765
.
R
765
p
l aces
±
mor e
t r i gger
p
ul se
i s
p
r esent
.
H
owever ,
w
h
en ±
t r i gger
pul se
i s
not
p
osi t i ve
l evel
on
t
h
e
ano
d
e of
C
R
760
t
h
an
i s
on
t
h
e
ano
d e
p
r esent ,
±
f r ee- r unni ng r ef er ence
t r ace
i s
pr o
d
uce
d
i n
t
h
e
of
C
R
761,
so
C
R
761
r emai ns
r ever se
b
i ased
.
T
h
e
Swee
p
A
U
TOT
R
I G
mo
d e
.
T
h
i s
occ
u
r s
as
f ol l ows
:
R
eset
M
ul t i vi
b
r at or
i s
now
r eset
as
d
escr i bed
f or
FULL
o
p
er at i on
at
t
h
e
p
oi nt
w
h
er e
C
R
760
( i nst ea
d
of
C
R
761)
i s
T
h
e
aut o- gat e
l evel
f r om
t
h
e
A
u
t o
M
ul t i vi
b
r at or st age
i n
f or war
d
b
i ase
d
.
Si nce
t
h
i s
occur s
at
±
mor e
p
osi t i ve
l evel
on
t
h
e
‘
Tr i gger
Gener at or
ci r cui t
i s
al so
connect e
d
t o
C
R
796
.
t
h
e
negat i ve- goi ng
sawt oot
h
,
t
h
e d
i s
p l ayed
swee
p
i s
s
h
or t er
.
Wh
en
t
h
e
aut o- gat e
l evel
i s
p
osi t i ve
( t r i gger e
d
) ,
t
h
e
cur r ent
T
h
us
R
765
p
r ovi
d
es
±
var i a
b
l e
swee
p
l engt
h
f or
t
h
e
‘
f l owi ng
t
h
r oug
h
CR
796
and
R
797
r ever se
bi ases
C
R
797
sweep
( f r om
a
b
out
11
di vi si ons
i n t
h
e
FULL
p
osi t i on
t o
an d
t
h
e
Swee
p
Gat e
t unnel
d
i ode,
C
R
702,
o
p
er at es
as
abo
u
t
f o
u
r
d
i vi si ons i n
t
h
e
f ul l y
cl oc
k
wi se
p
osi t i on- not
i n
p
r evi ousl y
d
escr i be
d f or
N
O
RM
T
R
I G
o p
er at i on
.
H
owever ,
’
EN
DS
‘
d
et ent )
.
I n
t
h
e
’
EN
DS
‘
p
osi t i o
n
( f
u
l l y
w
h en
t
h
e
i nst r ument
i s
n
ot
t r i gger e
d
,
t
h
e
a
u
t o- gat e
l evel
co
u nt er cl oc
k
wi se) ,
±
n
egat i ve- goi ng
p
ul se
f r om
t
h
e
’
Swee
p
d
r o
p
s
negat i ve an
d
t
h
e
r e
d
uct i on
i n
cur r ent
t
h
r oug
h
C
R
796
Gener at or
ci r cui t
i s
connect e
d t o
t
h
e
b
ase
of
Q775
t
h
r oug
h
an
d
R
797
al l ows
C
R
797
t o
become
f or war
d
bi ase
d
.
Now,
C
R
770
at
t
h
e en d of
t
h
e
’
swee
p
t i me
.
I f
t
h
e
‘
swee
p
i s
w
h
en
t
h
e
Swee
p
R
eset
M
ul t i vi
b
r at or st age
r eset s
at
t
h
e
en
d
st i l l
r unni ng,
t
h
i s
n
egat i ve- goi ng
p
ul se
t ur ns
on
Q775
t o
en
d
of
t
h
e
h
ol
d of f
p
er i o
d
,
t
h
e
a
dd
i t i o
n
al
c
u
r r e
n
t
f r o
m
3-
22
Aut o
Tr i gger
M
ode
O
p
er at i on

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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