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Tektronix 454A User Manual

Tektronix 454A
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664
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Descr i p
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/
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454A
C
u
r r
en
t P
at
h
R
ever se-
B
i ase
d
Di od
e
F
i g
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3- 11
.
Tr i gger
p
at
h
f or
n
egat i ve- sl o
p
e
t r i gger i ng
( si m
p
l i f i ed
‘
Tr i gger
d
i ag
r
a
m
) .
0664
i s
connect e
d
as
an
ampl i f i er ,
wi t
h
t
h
e p
r i mar y
of
Am
p
l i f i er
Q669
t
h
r o
u
g
h
t
h
e
p
r i mar y
wi n
d
i ng
of
t r a
n
s-
t r ansf or mer
¤
670,
i n
ser i es
wi t
h
t
h
e emi t t er
of
Q669
p
r o-
f or mer
¤
670
.
0669
i s
connect e
d
as
± gr o
u n d
ed-
b
ase
am
p
l i -
vi
d
i ng
t
h
e
col l ect or
l oa
d
.
T
h
e negat i ve- goi ng
p
ul se
at
t
h
e
f i er ,
wi t
h
t
h
e p
r i mar y
of
t r ansf or mer
¤
669
p
r ovi
d
i ng
t
h
e
b
ase
of
Q664
d
r i ves
i t
i nt o h
eavy
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d
u
ct i on,
an d
t
h
e
onl y
col l ect or
l oa
d
.
T
h
e p
osi t i ve- goi ng
si gnal at
t
h
e
emi t t er
r esul t i ng
cur r ent
i ncr ease
of
Q664
f l ows
t
h
r oug
h
¤
670,
of
0669
ca
u
ses
Q669
t o
con
d
u
ct
h
eavi er ,
wi t
h
t
h
e
i n-
C664,
R
659
an d
R
658
.
Due
t o
t
h
e
s
h
or t
t i me- const ant
of
cr eased
col l ect or
c
u
r r ent
f l owi ng
t
h
r o
u
g
h
t
h
e p
r i mar y
of
t
h
e
LR
net wor
k
i nvol vi ng
R
666-
L
664,
t
h
e
c
u
r r ent
of
Q664
t r ansf or mer
¤
669
.
T
h
e o
u
t
p
ut
si gnal
f r om
t
h
e
secon
d ar y of
qu
i c
k
l y
r et
u
r ns
t o
t
h
e
l evel
d
et er mi ne
d by
R
664
an d
t
h
e
t r ansf or mer
¤
669
i s
± negat i ve- goi ng
si gnal
t
h
at
i s a
pp
l i e
d
col l ect or
l oad
.
T
h
e
r es
u
l t ant
si gnal at
t
h
e
col l ect or
of
0664
t
h
r o
u
g h
CR
671
an d
C671
t o
t
h
e
swee
p
- gat i ng
t
u
nnel
d
i o
d e
i s
± p
osi t i ve- goi ng
f ast - r i se
p
ul se
wi t
h
t
h
e wi d
t
h d
et er mi ne
d
i n
t
h
e
‘
Swee
p
Gener at or
ci r c
u
i t
.
b
y
t
h
e
t i me
const ant
of
t
h
e
LR
net wor
k
i n
t
h
e
ci r cui t
.
T
h
e
si gnal
i n t
h
e
secon
d ar y of
¤670
i s
±
posi t i ve- goi
n
g
pu
l se,
coi nci dent
wi t
h
t
h
e
r i se
of
t
h
e
o
u
t
p ut
si gnal
f r om
t
h
e
t r i g-
Aut o
P
ul se
Ampl i f i er
ger
TD
st age
.
T
h
e
p
osi t i ve- goi ng
t r i gger
p
u
l se
f r om
t
h
e
secon
d
ar y
wi ndi ng
of
¤
670
i s
connect ed
t o
t
h
e base of
0674
.
T
h
i s
I sol at i on
Ampl i f i er
st age
i s
si mi l ar
i n
conf i g
u
r at i on
t o
t
h
e
P
ul se
Am
p
l i f i er
st age
.
T
h
e p
r i mar y
of
p
u
l se
t r ansf or mer
¤
680
p
r ovi
d
es
t
h
e
ma
j
or
T
he
f ast - r i se
pu
l se
f r om
t
h
e
col l ect or
ci r c
u
i t
of
P
ul se
col l ect or
l oa
d f or
t
h
i s
st age
.
T
h
e
p
osi t i ve- goi ng
t r i gger
p
ul se
Am
p
l i f i er
Q664
i s
a
pp
l i e
d
t o
t
h
e
emi t t er
of
I sol at i on
i s
i nver t e
d
t
h
r o
u
g h
Q674
a
n
d
¤
680
t o
pr od
u
ce
±
p
osi t i ve-
3-
1
7

Table of Contents

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Preview: Operator's Handbook
Operator's Handbook20 pages

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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