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Tektronix 454A User Manual

Tektronix 454A
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Si g
n
al
i
n
f
r
om
Ch
a
nn
el
1
V
e
r
t i cal
Pr
ea
mp
R
21
4
CH
2zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Ÿ
A
LT
- 12V
Ÿ
C
H
O
P
Ÿ
ADD
R
210
R
220
R
213
R
223
S238A
M
OD
E
C
H
1
0215
0225
C
ha
nn
el
1
Di o
d
e
Gat e
5
¯ · ±™
C
R
206
g
*
i
n
f r
o
m
C
R
207
C
h
a
nn
el
2
V
e
r
t i cal
Pr
eam
p
CR
208
CCR
-
1
1~11
4
.
1P
'
201
- - _- - -
V
er t i cal
C
R
202
Si gnal
t o
Del ay- L
i
n
e
D
r
i ve
r
St age
CR
202
,
C
ha
nn
el
2
Di o
d
e
Gat e
R
224
Ci r cui t
Descr i p
t i on- 454
/
R
454A
C
ur r
e
n
t
P
at
h
R
eve
rse-
B
i ased
Di o
d
e
F
i g
.
3- 6
.
E
f f ect
of
Di o
d
e Gat es
on
si g
n
al
p
at
h
( si m
p
l i f i e
d d
i agr am)
.
Co
nd
i t i ons
s
h
ow
n
f or
C
H
2
posi t i o
n
of
t
h
e
M
OD
E
swi t c
h
.
vi o
u
sl y
ar e
r ever se
d
;
now
t
h
e
C
h
annel
1
Di o
d
e
Gat e
i s
r e-
i ng
si gnal
r egar
d
l ess
of
t
h
e d
ef l ect i on
si gnal at
t
h
e
ano
d
es
of
ver se bi ase
d
an
d
t
h
e
C
h
an
n
el
2
si gnal
p
asses
t
h
r oug
h
t
h
e
t
h
e
s
hu
nt
d
i o
d
es
.
C
h
annel 2
Di o
d
e
Gat e
.
CH
O
P
.
I n t
h
e
C
H
O
P
p
osi t i on
of
t
h
e
M
OD
E
swi t c
h
,
t
h
e
T
h
e
R
ef er ence
F
eed
b
ac
k
st age,
Q253,
p
r ovi
d
es
commo
n
-
Swi t c
h
i ng
Mu
l t i vi
b
r at or st age
f r ee
r u
n
s
as
an
ast a
b
l e
m
u
l t i -
mo
d
e
vol t age
f ee
db
ac
k
f r om
t
h
e Del ay-
L
i ne
Dr i ver
st age
t o
vi
b
r at or
at a
b
out
one- mega
h
er t z
r at e
.
T
h
e
emi t t er s of
Q215
al l ow
t
h
e
d
i o
d
e
gat es
t o
be
swi t c
h
ed
wi t
h
±
mi ni mum
an
d
Q225
ar e
connect e
d
t o
- 12
vol t s
t
h
r oug
h R
219
or
am
p
l i t
ud
e
swi t c
h
i ng
si gnal
.
T
h
e emi t t er
l evel
of
Q253
i s
R
229
an
d
t
h
e
p
r i mar y
of
¤240
.
At
t
h
e
t i me
of t ur n- on,
one
connect ed
t o
t
h
e
j un
ct i o
n
s
of
t
h
e
Swi t c
h
i ng
M
ul t i vi br at or
of
t
h
e
t r ansi st or s
b
egi ns t o
con
d
u
ct
;
f or
examp
l e,
Q225
.
col l ect or
r esi st or s,
R
210-
R
213
an d
R
220-
R
223
t
h
r o
u
g
h
Q225
con
d
uct s
t
h
e
C
h
annel
2
c
u
r r ent
an d p
r event s
t
h
e
C
R
212
or
C
R
222
.
T
h
e
col l ect or
l evel
of
t
h
e
" on"
Swi t c
h
-
C
h
annel 2
si gnal
f r om
r ea
d
i ng
t
h
e
Del ay-
L
i ne
Dr i ver
st age
.
i ng
M
ul t i vi br at or
t r a
n
si st or
i s
negat i ve
and
ei t
h
er
C
R
212
or
M
eanw
h
i l e,
t
h
e
C
h
annel
1
Di o
d
e
Gat e
p
asses
t
he
C
h annel
1
C
R
222
i s
f or war
d b
i ase
d
.
T
h
i s
cl am
p
s t
he cat
h
o
d
e
l evel
of
si gnal
t o
t
h
e Del ay-
L
i ne
Dr i ver
st age
.
t
h
e
f or war
d
-
b
i ase
d s
h
unt
d
i o
d
es i n
t
h
e
a
pp
l i cabl e
Di o
d
e
Gat e
about
0
. 5
vol t
mor e
negat i ve
t
h
an
t
h
e
emi t t er
l evel
of
Q253
.
T
h
e
s
h
unt
di odes
ar e
cl am
p ed near
t
h
ei r
swi t c
h
i ng
T
h
e
f r e
qu
ency-
d
et er mi ni ng
com
p
onent s
i
n
t
h
e
C
H
O
P
l evel ,
an
d
t
h
er ef or e
t
h
ey
can
b
e
swi t c
h
e
d
ver y
f ast
wi t
h
±
mo
d
e
ar e
C218-
R
219-
R
229
.
Swi t c
h
i ng
act i on
occ
u
r s
as
mi ni m
u
m
ampl i t
u
d e swi t c
h
i
n
g
si g
n
al
.
T
h
e
l evel
at
t
he emi t -
f ol l ows
:
Wh
en
Q225
i s
on,
C218
at t em
p
t s
t o c
h
ar ge t o
- 12
t er
of
Q253
f ol l ows
t
h
e
aver age vol t age
l evel
at
t
he emi t t er s
vol t s
t
h
r oug
h
R
219
.
T
h
e
emi t t er
of
Q215
sl owl y
goes
t o-
of
t
h
e
Del ay-
L
i
n
e Dr i ver
st age
.
T
h
i s
mai nt ai ns
a
b
out
t
h
e
war
d
- 12
vol t s
as
C218
c
h
ar ges
.
T
h
e base
of
Q215
i s
h
el
d
same
vol t age
d
i f f er e
n
ce
acr oss
t
he
Di ode
Gat e
s
h u
n
t
d
i o
d
es
at
±
negat i ve
p
oi nt
d
et er mi ne
d
by
vol t age
d
i vi
d
er
so
t
h
ey ca
n
be
swi t c
h
ed wi t
h
±
mi ni mum
ampl i t u
d e swi t c
h
-
R
216-
R
225
bet ween
- 12
vol t s
an d
t
h
e
col l ect or
of
0225
.

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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