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Tektronix 454A User Manual

Tektronix 454A
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Ci r cui t
Descr i pt i on
- 454A/
R
454A
vi
deszyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
±
sam
p
l e
of
t
he
l i ne
vol t age t o
t
h
e
an d
Tr i gger
T
he
osci l l at i ons
of
t
he
L
C
ci r cui t ,
¤
1275- C1275,
ar e
Gener at or
ci r c
u
i t s
f or
i nt er nal
t r i gger i ng
at
t h
e
l i ne
f r e-
s
u
st ai ne
d
b
y
t
he
f ee
d
b
ac k
wi n
d i ng of
¤
1275
connect ed
t o
q
uency
.
t
he b
ase
of
Q1275
.
C1286
connect s
±
sam
p
l e
of
t
he
out p
u
t
f r om
t
he
L
C
ci r cui t
t o
t
he
b
ase of
Q1285
.
T
h e
r egener at i ve
f eedbac
k
f r om
t
he
emi t t er
of
Q1285
t o
t
he emi t t er of
V
O
L
TAG
E
DI STR
I
BU
TI ON
Q1275
pr od uces
f ast
c
h
ange- over
bet ween
Q1275
an d
01285
t o p
r ovi
d
e
±
f ast
r i set i me
on
t
h
e
o u
t
p ut
s
q uar e
Di agr am
14
s
h
ows
t
he d
i st r i
bu
t i on
of
t
he
out
p ut
vol t -
wave
.
F
r e
q
uency
of t he o u
t
p u
t s
qu
ar e
wave
can
be
a
d
j u
st e
d
ages
f r om
t
he
P
ower
Su pp
l y ci r c
u
i t
t o
t
he
ci r c
u
i t
b oar d
s i n
by
var yi ng
t
he
i n
d
uct ance
of
t
he p
r i mar y
wi n
d
i ng
of
T1275
t
h
i s
i nst r
u
ment
.
T
he
d
ecou
p
l i ng
net wor
k
s
w
h
i c
h p
r ovi
d
e
sl i g
h
t l y
.
Th
e
s
q
uar e- wave
si gnal at
t
he
col l ect or
of
Q1285
i s
d
eco
up
l e
d op
er at i ng vol t ages
ar e
s
h
own
on
t h
i s
Di agr am
connect ed
t o
t
h
e
Out
p u
t
Am
p
l i f i er
.
an d
ar e
not
r e
p
eat e
d
on
t
he
i n
d
i vi
d u
al
ci r cui t
d
i agr ams
.
3-
3
4
Osci l l at or
01275,
01285
O
u
t
pu
t
Ampl i f i er
01294
Out
p
ut
Am
p
l i f i er
CA
L
I
BR
ATO
R
T
he o u
t
p
u
t
si gnal
f r om
t
h
e
osci l l at or
st age
over d
r i ves
Gener al
Q1294
t o
pr o
d
uce
t
he
accur at e
s
q
uar e
wave
at
t
he
out
p ut
.
.
Wh
en
t
he
base
of
Q1294
goes
p
osi t i ve,
Q1294
i s
c
u t
of f
an
d
.
T
h
e
Cal i br at or
ci r cui t
p
r o
d
uces
±
sq
u
ar e- wave
o
u
t
p u
t
t
h
e
out
p u
t
si gnal
dr op
s
negat i ve
t o
gr oun
d
.
Wh
en
t
he base
wi t
h
acc
u
r at e
am
p
l i t ude
an
d
f r e
q
uency
.
T
h
i s
o u
t
p ut
i s
goes
negat i ve,
Q1294
i s
d
r i ven
i nt o
sat ur at i on
and
t
h
e
out -
avai l a
b
l e
as
±
s
qu
ar e- wave
vol t age
at
t
he
1
V
CA
L
1
kH
z
p
u
t
si gnal
r i ses
p
osi t i ve
t o
a
b
out
+12
vol t s
.
T
he
col l ect or
connect or
an d
as
± sq
uar e- wave
c
u
r r ent
t
h
r oug
h
t
he
C
UR-
cur r ent
of
Q1294
f l ows
t
hr oug h
R1296,
R1298
an
d
t
h e
REN
T
PR
O
BE
CA
L
l oop
.
F
i g
.
3- 18
s
h
ows
± d
et ai l e
d
bl oc
k
C
URREN
T
PR
O
BE
CA
L
l oop
on
t
he
si
d e p
anel
.
Cur r ent
d
i agr am
of
t
he
Cal i br at or
ci r cui t
.
sch
emat i c
of
t
h
i s
ci r cui t
.
t
h
r oug
h
t
he
C
URREN
T
PR
O
BE
CA
L
l oop
i s
±
f i ve-
i s
s
h
own
on
d
i agr am
15
at
t
he
b
ac k
of
t
h
i s
manual
.
mi l l i am
p
er e
squar e
wave
.
T
he ou
t
p u
t
vol t age
i s
connect e
d
f r om
t
he d
i vi der
R1296- R
. 1298
t o
t
h
e
1
V CA
L
1
kH
z
connect or
t
hr oug h
R1299
.
T
he
out
p
ut of
t
h
e
+12-
V
ol t
Osci l l at or
Su
pp
l y
i s
a
d
j
ust e
d
f or
an
accur at e
one- vol t
out
p ut
si gnal at
t
h
e 1
V CA
L
1
kH
z
connect or
.
Q1275
an d
i t s
associ at e
d
ci r cui t r y
com
p
r i ses
± t uned-
col l ect or
osci l l at or
.
F
r e
q
uency
of
osci l l at i on
i s
d
et er mi ne
d
by
t
h
e
L
C
ci r cui t
ma
d e
up
of
t
he p
r i mar y
of
var i a
b
l e
t r ans-
AXI S
A
MPL
I
F
I
ER
f or mer
¤
1275
i n
par al l el
wi t h
C1275
.
T
he acc ur acy an d
Gener al
st abi l i t y
r e
qu
i r e
d t o p
r ovi
d e an
accur at e
t i me
an d
f r e-
qu
ency
r ef er ence
i s
o b
t ai ne
d
by
usi ng ± ca p
aci t or
an
d
t r ans-
T
h
e
Axi s
Am
p
l i f i er
ci r c
u
i t
cont r ol s
t
he
CRT
i
n
t ensi t y
f or mer
w
h
i c
h have
o
pp
osi t e
t emper at ur e
coef f i ci ent s
.
l evel
f r om
sever al
i n
p u
t s
.
T
h
e
ef f ect
of
t
h
ese
i n
p ut
si gnal s
i s
F
i g
.
3- 18
.
Cal i br at or
d
et ai l e
d b
l oc
k d
i agr am
.
81296
81299
-
1
V
CA
L
1
kH
z
C
URREN
T
PR
O
BE CAL
5
mA

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Tektronix 454A Specifications

General IconGeneral
BrandTektronix
Model454A
CategoryTest Equipment
LanguageEnglish

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