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Tektronix 454A User Manual

Tektronix 454A
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I f
t
h
e
mul t i vi br at or
d
oes
not
r ecei ve
anot
h
er
Tr i gger
Out
p ut
Si gnal
Am
p
l i f i er
.
T
h
e p
osi t i ve- goi ng
gat e p
ul se
Pu
l se,
C689
r ec
h
ar ges
t o
abo
u
t
+13
vol t s
i n
abo
u
t
85
mi l l i -
f r om
t
h
e
Swee
p
Gat e
st age
i s
a
pp
l i e
d
t o
t
h
e
base of
Q716
.
secon
d
s
.
T
h en
Q694
i s
bi ased
of f
t o en d
t
h
e a u t o gat e
T
h
e
r es
u
l t ant
negat i ve- goi ng
si gnal
at
t
h
e
col l ect or
of
Q716
(
d
i s
p
l ay
f r ee
r
u
ns
or
i s
u
nst a
b
l e)
.
H
owever ,
i f zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
±
r e
p
et i t i ve
p
r ovi
d
es
t
h
e
u
nbl an
k
i ng
gat e
si gnal ,
an
d
i s
al so
connect e
d
t r i gger
si gnal
t
u
r
n
s
0685
on
agai n
bef or e
C689
h
as
r e-
t o
t
h
e
H
ol
d of f
Dr i ver
st age
.
C
R
715
pr event s
t
h
e
si gnal
l evel
c h
ar ged
t o
+13
vol t s,
C689
i s
di sc
h
ar ge
d
compl et el y
agai n
at
t
he
ano
d
e
of
C
R
717
f r om
goi ng
mor e
n
egat i ve
t
h
a
n
an d
once
mor e
st ar t s
t o c
h
ar ge
t owar ds
+75
vol t s
.
Si nce
t
h
e
abo
u
t
- 0
. 5
vol t
.
I n
al l
p
osi t i ons
of
t
h
e
H
O
R
I Z
DI S
PL
AY
base of
Q694
r emai ns
negat i ve
eno
u
g
h
wi t
h
±
r e
p
et i t i ve
swi t c
h
S1001A
exce
p
t
§
- Y,
cur r ent
i s
co
n
nect e
d t o
t
h
e
t r i gger
si gnal t o
h
ol
d
i t
i n
con
d
u
ct i on,
t
h
e
aut o
gat e o
u
t put
ano
d
e
of
C
R
717
t
h
r o
u
g
h R
717
.
B
ef or e
t
h
e
Sweep
Gat e
l evel
i s
cont i nuous
t o
pr od
u
ce
±
t r i gger e
d
di s
p
l ay
( see
Aut o
st age
i s
swi t c
h
e
d
,
t
h
i s
c
u
r r ent
f l ows
t
h
r o
u
g
h
CR
717
f r om
Tr i gger
M
o
d e o per at i on
i n
t
h
e
Swee
p
Gener at or
d
escr i
p
-
t
h
e
Axi s
Am
p
l i f i er
ci r c
u
i t
an d
t
h
e
C
R
T
i s
b
l an
k
e
d
.
Wh
en
t i on)
.
t
h
e
Swee
p
Gat e
st age
swi t c
h
es
an d
t
he
col l ect or
of
0716
goes
negat i ve,
C
R
717
i s
r ever se
bi ase
d an d
t
h
e
cur r ent
f r om
R
717
i s
s
h
unt ed
by
0716
.
C
R
717
i s
r ever se
b
i ase
d
an d
t
h
e
S
WEEP
G
ENER
ATO
R
CR
T
i s
unbl an
k
e
d
t o
al l ow
t
h
e
swee
p
t o
be
d
i s
p l ayed
.
I n
t
h
e
¤•
D
UR
I
N
G p
osi t i on
of
S1001A,
a
dd
i t i onal
Gener al
c u
r r ent
i s
a
dd
ed t o
t
h
e
ci r c
u
i t
at
t
h
e cat
h
o d e of
C
R
717
t
h
r oug
h
R
719
an
d
R
950
( i n
Swee
p
Gener at or
ci r cui t )
.
T
h
e
Sweep
Gener at or
ci r cui t
pr od uces
±
sawt oot
h
Thi s
a
dd
i t i onal
c
u
r r ent
r e
d
u
ces
t
h
e
i nt ensi t y
l evel
of
t
h
e
vol t age
w
h
i c
h
i s
am
p
l i f i e
d
by
t
h
e
H
or i zo n
t al
Am
p
l i f i er ci r -
CRT
d
i s
p
l ay
du
r i ng
swee
p
t i me
.
T
h
en,
w
h
en
t
h
e
Swee
p
cui t
t o p
r ovi
d
e
h
or i zont al
swee
p def l ect i on
on
t
h
e
C
R
T
.
Gener at or
p
r o
d uces
an
unbl an
k
i ng
gat e,
t
h
i s
c u
r r ent
i s
T
h
i s
o
u
t
p u
t si g
n
al i s
gener at e
d
on
comman
d
( t r i gger
p
ul se)
s
h
unt e
d
by
t
h
e
unbl an
k
i ng
gat e
an
d
±
br i g
h
t ened
p
or t i on
f r om
t
h
e
Tr i gger
Gener at or
ci r cui t
.
T
he
Sweep
Gener a-
i s
pr o
d
uce
d
on
t
h
e d
i s
p
l ay
w
h
i c
h
i s
coi nci dent
wi t
h
t
h
e
f
or
ci r cui t
al so
pr od
u
ces an
un
b
l an
k
i ng
gat e t o
u
nbl a
nk
t
h
e
t i me
.
C
R
T
d
ur i ng
swee
p
t i me
.
I n
a
dd
i t i on,
t
h
i s
ci r cui t
p
r od
u
ces
sweep
sever al
cont r ol
si gnal s
f or ot
h
er
ci r c
u
i t s
wi t
h
i n
t
h
i s
i nst r
u
-
ment
an d
t wo out
p
ut
si gnal s
t o
t
h
e
si
d
e-
p
anel
connect or s
.
I n
t
h
e
§
-
¥
p
osi t i on
of
t
h
e
H
O
R
I Z
DI S
PL
AY
swi t c
h
,
F
i g
.
3- 13
s
h
ows
±
d
et ai l ed
b
l oc
k
d
i agr am
of
t
h
e
Sweep
+12
vol t s
i s
connect e
d t o
t
h
e
cat
h
o d
e
of
C
R
717
t
h
r oug
h
Gener at or
ci r c
u
i t
.
sc
h
emat i c
of
t
h
i s
ci r c
u
i t i s
s
h
own
on
R718
.
T
h
i s
h
ol
d
s
C
R
717
r ever se
bi ase
d
t o bl oc
k
t
h
e
d i agr am 7
at
t
h
e
b
ac
k
of
t
h
i s
manual
.
un
b
l an
k
i ng
gat e
.
T
h
e
§
-
¥
i nt ensi t y
l evel
i s
est a
b
l i s
h
e
d
by
t
h
e
cur r ent
t
h
r o
u
g
h
R
718,
t
h
e
I
N
T
EN
SI TY
cont r ol
set t i ng,
T
h
e
S
WEEP
M
OD
E
al l ows
t
h
r ee
modes
of
o
p
er at i on
.
an
d
t
h
e
l evel
est abl i s
h
e
d by
t
h
e
H
O
R
I Z
DI S
PL
AY
swi t c h
i n
I n
t
h
e
N
O
RM
T
R
I G p
osi t i on,
±
swee
p
i s
p
r o
d
uce
d
onl y
t he
Axi s
Am
p
l i f i er
ci r cui t
( see
Axi s
Am
p
l i f i er
d
i s-
w
h
en ±
t r i gger
p
ul se
i s
r ecei ve
d
f r om
t
h
e
Tr i gger
Gener a-
cessi on)
.
f
or
ci r c
u
i t
.
Oper at i on
i n
t
h
e
A
U
TOT
R
I G p
osi t i on
i s
m
uc
h
t
h
e
same
as
N
O
RM
T
R
I G,
exce
p
t t
h
at
±
f r ee- r
u
nni ng
t r ace
i s
d
i s
p l ayed
w
h
en ±
t r i gger
p
ul se
i s
not
p
r esent ,
or
w
h
en
t
h
e
Gat e
Out p
u
t
.
T
he p
osi t i ve- goi ng
gat e
si gnal at
t
h
e
ampl i t
u
d e of
t
he
t r i gger
si gnal
i s
not ade
q
uat e
.
I n
t
h
e
base
of
Q716
i s
emi t t er - co
up
l e
d t o
Q726
.
T
h
i s
p
osi t i ve-
SI
N
G
LE
S
WEEP
p
osi t i on,
oper at i on
i s
al so
si mi l ar
t o
goi ng
si gnal
at
t
h
e
emi t t er
of
Q726
c
u
t s
i t
of f ,
an
d
t
h
e
N
O
RM
T
R
I G,
exce
p
t t
h
at
t
h
e
swee
p
i s
not
r ecur r ent
.
T
h
e
r es
u
l t i ng
p
osi t i ve- goi ng
si gnal
at
i t s
col l ect or
i s
cou
p
l ed
t o
f ol l owi ng
ci r cui t
d
escr i
p
t i on
i s
gi ven
wi t
h
t
h
e
S
WEEP
t
h
e
V
er t i cal
Swi t c
h
i ng
ci r cui t
t
h r o
u
g
h
C728
t o p
r ovi
d
e
an
M
OD
E
swi t c h
set
t o
N
O
RM
T
R
I G
.
Di f f er ences
i n
op
er at i on
al t er nat e- t r ace
sync
p
ul se
f or
du
al - t r ace
o p
er at i on
.
I t
i s
al so
f or
t
h
e ot
h
er
t wo
mo
d
es
ar e d
i scussed
l at er
.
co
u p
l e
d t o
t
h
e
+
GAT
E
o
u
t
p
ut
connect or
on
t
h
e
si
d e
p a
n
el
t
h
r ou
g
h
R
727
t o
p
r ovi
d e
±
gat e
si gnal
( a
b
out
+12
vol t s
i n
am
p
l i t u
d
e)
w
h
i c
h
i s
coi nci
d
ent
wi t
h
t
h
e
swee
p
.
N
or mal
Tr
i
gger
M
od
e
O
p
er at
i
on
C
R
726
cl am
p
s t
h
e
col l ect or
of
Q726
at
about
- 0
. 5
vol t
w
h
en
i t i s
con
d uct i ng
.
Sweep
Gat e
.
T
h
e
negat i ve- goi ng
t r i gger
p
ul se
gener at e
d
by
t
h
e
Tr i gger
Gener at or
ci r c
u
i t i s
a
p
p
l i e
d
t o
t
h
e
Swee
p
Gat e
st age
t
h
r oug
h
C
R
701
.
Tunnel
d
i o
d e
C
R
702
i s
qu
i es-
H
ol
d
of f
Dr i ver
.
T
h
e
negat i ve- goi ng
si gnal at
t
h
e
col -
cent l y b
i ased
on
i n
i t s
l ow- vol t age
st at e
.
Wh
en
t
h
e
negat i ve-
l ect or
of
Q716
w
h
en
t
h
e
swee
p
begi ns
i s
connect e
d t o
t
he
goi ng
t r i gger
pu
l se
i s
a
pp
l i e
d
t o
i t s
cat h o
d
e, t
h
e
cur r ent
H
ol
d
of f
Ca
p
aci t or
t
h r o
u
g h
Q714
.
T
h
i s
negat i ve- goi ng
si gnal
t
h
r oug
h
C
R
702
i ncr eases
and
i t r a
p
i
d
l y
swi t c
h
es
t o
i t s
h
i g
h
-
di sc
h
ar ges
t
h
e
H
ol
d of f
Ca
p
aci t or
com
p
l et el y
at
t
h
e
st ar t
of
vol t age
st at e,
w
h
er e
i t
r emai ns
unt i l
r eset
by
t
h
e
Swee
p
eac
h
swee
p t o p
r ovi
d
e acc
u
r at e
swee
p
h
ol
d
of f
t i me
.
C
R
710
R
eset
Mu
l t i vi br at or
st age
at
t
h
e
en
d of
t
h
e
swee
p
.
T
h
e
cl am
p
s t
h
e
col l ect or
of
Q714
so
i t
d
oes not
go
mor e
nega-
negat i ve- goi ng
l evel
at
t
h
e
cat
h
o d e
of
C
R
702
i s
connect ed
t i ve
t
h
an
a
b
out
- 0
. 5
vol t
.
t
o
t
h
e b
ase
of
Q704
t
h
r oug
h
C702
an
d
R
702
.
0704
i s
t
u
r ne
d
on
an d
i t s
col l ect or
goes p
osi t i ve
.
T
h
i s
p
osi t i ve- goi ng
st e
p
i s
cou
p
l e
d
t
h
r oug
h
R
704
t o
t
h
e
Di sconnect
Am
p
l i f i er
Di sconnect
Am
p
l i f i er
.
T
he
Di sconnect
Ampl i f i er ,
Q724,
an
d
t
h
e
Out
p ut
Si gnal
Am
p
l i f i er
.
i s
qu
i escent l y
con
d
u
ct i ng
c
u
r r ent
t
h
r o
u
g
h
R
759,
Ti mi ng
Ci r cui t
Descr i
p
t i on- 454
/
R
454A
3-
1
9

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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