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HP 435B Service Manual

HP 435B
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SERV
IC
ES
HEE
T
5
PR
I
N
CI
PLE
S
O
F
O
PER
ATIO
N
General
Th
e
Α
3asse
mbly
provid
es
α
50
±5
MHz
o
u
t
pu
t
at
1
m
W
±0
.
7%
.
Th
e
osc
ill
ato
r
ou
t
pu
t
i
s
h
e
ld
co
n
sta
n
t
byan
AL
C
loop
m
ad
e
up
o
f
α
peak d
etecto
r
C
R
2
a
nd
co
mp
arato
r
U
2
.
Th
eco
mp
a
r
atorrefe
r e
n
ce
inpu
t
i
s fr
o
m
α
v
e
ry sta
bl
e
+5
V
p
o
w
er
s
upply
co
mp
osed o
f
U
1,
VR
1,
VR
2,
Q2,
a
n
d
t
he
ir
assoc
i
ate
d co
mp
o
n
e
n
ts
.
Th
e
LEVEL
ADJ
co
n
t
r
o
l
R
4
sets
t
h
e
co
mp
a
r
ato
r r e
fer
e
n
ce
whi
c
h
co
n
tr
o
l
s
t
h
e
osc
ill
ato
r f
ee
dbac
k
l
eve
l
a
nd
t
h
e
r e
by
co
n
t
r
o
l
s t
h
e
Α
3
asse
mbly
P
O
W
ER
REFEREN
CE
O
UTPUT
l
e
v
e
l
.
50
MH
z
Oscillator
Th
e
osc
ill
ato
r
cir c
ui
t
i
s
m
ad
e
up
o
f
co
mm
o
n
e
mi
tte r
a
mplif
ie r
Q1
a
nd
i
ts
assoc
i
ated
co
mp
o
n
e
n
ts
.
R
es
i
sto
r s
R
10,
R
11,
R
12 a
nd
R
13
bi
as
Q1
f
or
an
e
mi
tte
r
c
urr
e
n
t
o
f
a
ppr
o
xim
ate
ly
5
mA
.
Th
e
n-
n
et
w
o
rk
t
un
e
d
c
ir
c
ui
t
(C9,
L
2,
C10
a
nd
C11)
d
ete
rmin
es
t
h
e
op
e r
at
in
g
fr e
qu
e
n
c
y
.
Th
e
a
mplifi
e
r
ac
gain
is
set
by
t
h
e
ope
r
at in
g
c
ir c
ui
t
imp
e
d
an
ceacross
t
h
e
t
un
edc
ir
c
ui
t
and
t
h
e
e
mi
tte
r
r
es
i
sto
r
R
15
(w
hi
c
h
i
s
ac
co
upl
e
d
to
g
r
o
und
by
C
12)
.
Th
epos
it
iv
e
f
ee
db
ac
k
r e
quir
e
d
to
s
u
sta
i
n
osc
ill
at
i
o
n
i
s
satisfied
in
t
hi
s
c
ir c
ui
t
.
Ph
ase
s
hif
t
o f
180°
i
s
αc
ha
r
acte
ri
st
i
co
f
b
ot
h
co
mm
o
n
-e
mi
tte r
t
r
a
n
s
i
sto
r
amplifiers
and
7r-network
t
un
e
d
c
ir
c
ui
ts
.
Thi
s
f
ee
db
ac
k
i
s
coupl
e
d
t
hro
ugh
C9
a
nd
C10, b
ac
k
to
t
h
e
b
ase o
f
Q1
.
A
L
C
L
oo
p
A
t t
h
e
pos
i t
iv
e
p
ea
k
o
f
eac
h
c
y
c
l
e,
c
u
rr e
n
t
m
o
m
e
n
ta
rily
flows
fr
o
m
t
he
f
ee
db
ack loop
t
hr
ou
gh p
ea
k
d
etecto
r
di
o
d
e
C
R
2
to
C7
.
Th
e
r
es ul
ta
n
t
sto
r
e
d
c
h
a
r
ge
i
s coupl
e d,
as α d
o
inpu
t
vo
l
tage,
to
pin 3
o f
U
2
.
Th
e
d
etecto
r ou
t
pu
t
i
s
co
mp
a
r e
d
to
α
v
e
ry
stab
l
e
r
efe
r e
n
ce
inpu
t
by co
mp
a
r
ato
r
U
2
.
Any
diff
e
r e
n
ce
b
etwee
n
t
h
e
co
mp
a
r
ato
r
's
inpu
t
v
o
l
tages
pr
o
du
ces
an
e
rr
o
r
vo
l
tage
at
t
h
e
d
o
o
u
t
pu
t
.
Th
e
co
mp
arator o
u
t
pu
t
i
s
coupl
e
d
to
α
r
eacta
n
ce vo
l
tage
divid
e
r,
ca
p
ac
i
to
r
C9
a
nd
v
aracto
r
C
R
3
.
As
t
h
e
er
r
o
r
o
u
t
pu
t
v
o
l
t-
age
goes
m
o
r e
p
os
i
t
iv
e t
h
e
ca
p
ac
i t
iv
e
r
eacta
n
ce
o
f
C
R
3
d
ec
r
eases,
whi
c
h
r e
du
ces
t
h
e osc
ill
ato
r
fee
db
ack
.
Conv
e
rse
ly,
α
m
o
r
e
n
ega-
t
iv
e o
u
t
pu
t
v
o
l
tage
w
ill
in
c
r
ease
t
h
e
f
ee
db
ack
.
For
exa
mpl
e,
if
t
h
e
osc
ill
ato
r
ou
t
pu
t
we
r e
to
s
udd
e
nly
in
c r
ease,
t
h
e
d
etecto
r
o
u
t
pu
t
wo
uld b
eco
m
e
m
o
r e
pos
i t
iv
e
.
Th
e co
mp
arator ou
tp
u
t
w
ould
b
eco
m
e
m
o
r
e
p
os
i
t
iv
e,
α
l
owe
r
C
R
3
r
eacta
n
ce
wo
uld
d
ec
r
ease
t
h
e
f
ee
db
ac
k
to
Q1
whi
c
h
f
o
r
ces
t
h
e
osc
ill
ato
r
o
u
t
pu
t
l
e
v
e
l
b
ac
k
to
i
ts
o
ri
g
in
a
l l
eve
l
.
If
t
h
e
R
4
LEVEL
ADJ
co
n
t
r
o
l
we
r e
ad
j
u
ste
d
f
o
r
α
m
o
r e
pos
i t
iv
e r
e
f
e
r e
n
ce
vo
l
tage,
t
h
e
co
mp
a
r
ato
r
o
u
t
pu
t
w
ould
go
m
o
r
e n
egat
iv
e,
t
h
e
f
ee
db
ac
k
wo
uld
in
c r
ease,
a
ll
o
win
g
t
h
e
osc
ill
a-
to
r
ou
t
pu
t
to
in
c
r
ease
.
Th
e
r e
f
o
r
e,
t
h
e p
ea
kd
etecto
r o
u
t
pu
t
w
ould
in
c r
ease
un
t
il i
t
e
qu
a
l
s
t
h
e
co
mp
a
r
ato
r r e f
e
r e
n
ce
l
e
v
e
l
inpu
t,
t
hu
s
esta
bli s
hin
g
α
hi
g
h
e
r
l
e
v
e
l
e
d
-o
u
t
pu
t
s
i
g
n
a
l
fro
m
t
h
e osc
ill
ato
r
.
P
ower
Supply
Ρ
/
Ο
Α
4
S
ERV
IC
E
S
HE
E
T
14

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HP 435B Specifications

General IconGeneral
BrandHP
Model435B
CategoryMeasuring Instruments
LanguageEnglish

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