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435B
HP 435B Service Manual
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S
ERV
IC
E
S
HEE
T
3
General
Γ
PR
I
N
CI
PLE
S
O
F
O
PER
ATIO
N
The
input
from
t
he
Synchronous
D
etector
passes
through
α
L
ow
P
ass
Filter
before
i
t
i
s
amplified
by
t
he
D
C
Amplifier
.
The
output
drives
the
M
eter,
the
Servo
Amplifier,
and
may
a
lso
b
e
coupled
t
hrough
t
he
RECORDER
O
UTPUT
j
ack
to
drive
'an
external
device
such
as
an
χ
-y
recorder
.
The
gain
o
f
t
he
D
C
Amplifier
is
set
by
t
he
CAL
FACTOR
switch
.
The
Servo
Amplifier
generates
an
error
voltage
if
t
he
D
C
Ampli-
fier
o
utput
i
s
n
ot
ground
potential
.
Without
an
RF
input
coupled
to
the
p
ower
sensor,
the
D
C
Amplifier
o
utput
i
s
v
ery
c
lose
to
0
Vdc
.
W
hen
t
he
ZERO
switch
is
pressed,
the
Servo
Amplifier
e
rror
o
ffset
v
oltage
i
s
coupled
to
the
Auto
Z
ero
circuits
.
The
error
vol-
tage
i
s
processed,
attenuated
a
nd
coupled
across
the
p
ower
sen-
sor's
p
ower
sensing
d
evice
output
as
α
z
eroing
correction
voltage
.
This
correction
voltage
i
s
of
e
qual
do
l
evel
but
opposite
p
plarity
to
the
output
of
t
he
p
ower
sensing
d
evice
(no
RF
input)
.
With
the
corrected
input
v
oltage,
the
D
C
Amplifier
o
utput
i
s
exactly
zero
.
When
t
he
ZERO
switch
is
r
eleased,
the
Servo
Amplifier
o
utput
v
oltage
i
s
stored
within
t
he
Auto
Z
ero
circuits
and
t
he
correction
voltage
r
emains
coupled
across
the
output
of
t
he
p
ower
sensing
d
evice
.
(Refer
to
the
Auto
Z
ero
f
eedback
diagram
below
.)
PO
WER
S
EN
SI
N
G
-
I
NPU
T
Ι
Ι
_
AC
SYN
C
DC
D
E
V
IC
E
A
MPL
I
F
I
ER
A
MPL
I
F
I
ER
S
DET
E
CTO
R
A
MPL
I
F
I
ER
A
U
TO
ZERO
®
~
.
_
Z
ER
O
(~
1
S
ERV
O
A
u
to
Zero
F
ee
db
ac
k
P
at
h
A
MPL
I
F
I
ER
-'
86
88
Table of Contents
Table of Contents
4
General Information
9
Introduction
9
In Struments Covered by Manual
9
De Sc R Iptio N
9
O P B Tio N S
10
Atte Ry
11
Sa F et y Co N S ID E R at I O N
11
HP M Odel 435 Β a
11
R Ecommend Ed Test Equipment
11
I Nstall Atio N
13
Introduction
13
Preparation for Use
13
T I a L in S P Ect I O N
13
Mete R
14
Ower Cable
14
Oltage Selection
14
L Ect I O N
14
Interconnections
14
L I N E V Oltage Selection
14
Operat Ing Environment
15
B Ench O Peration
15
F R Ac K Moun Ting
15
M Ains Plu Gs Available
15
B Atte Ry Installation
16
Ow er Mete R
16
3-12 . Battery
20
Rea R Pa N E L Co N Trol S, Connectors and Ind Icato R S
22
Oper Ator's C He Cks
23
O Per Ating Instru Ct I O N S
25
Per Atio N
26
Specified Uncertainties
27
Calculating M
29
Eas Ureme Nt un Certa Inties
29
Mismatch un Certai Nties
30
Calculating M Eas Ureme Nt un Certai Nty
31
Introduction
32
In Eas
32
R St Case
32
CC Ur
32
Ac Ur
32
Perf O Rm an Ce te Sts
34
Eco Rd
34
Rf Rm Ce Tests
34
Power Reference
34
Est
35
Z Ero Carryover Test Set up
35
Erform Ance Est
37
Est
38
Ad Ju St Men Ts
40
Introduction
40
N S
40
Ad J
40
Locations
40
Specifications
40
Actory Selected Co Mponents
40
Ower Reference Oscillator Level Adjustment
42
P Ower Reference Osc Ill Ator Level
43
Multivibrator Adjust Ment
45
Ower Meter Adjustments with 50Ω P
47
P Ower Meter Ad
47
Owe R Sensor
48
O W E R M Ete R Ad J U St M E N Ts Wi T H Ca Libr Ato R
50
With Calibrator
50
Repl Ac
52
Section E ABLE P V I a RTS
52
Introduction
52
Abbreviations
52
E Pl Acea Bl E P
52
Actory Se Lecte D Parts (*)
52
Orderin G in St Ructions
52
Arts Provi Sioning
52
Epl Acea Ble Parts
52
Ma Nu al Chan G es
63
Introduction
63
Manual Change in Structions
63
Servic E
65
Introduction
65
Sa F et y Co N S ID E R at I O N
65
H Eets
65
Fr O N T
69
Ower Sensor
77
Sc Hem at IC
78
Ge Neral Se Rvi Ce Inf Orm at Ion
79
Ca Libr Ato R
79
Oa Rd S
81
Ρ/Ο Α4 Ass Embly
82
Ρ/0 Α
86
P Ower S Upply
89
Operational Amplifiers
90
Ρ/Ο Α4 Assem Bl y
92
Ρ/Ο Α4 Ass Embly
99
Ower Refere Eference Assembly
107
Sc Hematic Diagram
107
Ocatio Ns
108
Ero
110
5
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HP 435B Specifications
General
Brand
HP
Model
435B
Category
Measuring Instruments
Language
English
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