Table of Contents
Advertisement
3-1.
INTRODUCTION
3-2.
This
section
of
the
manual
contains the theory
of operation
for
the
Model 3330B.
The
information
is
arranged
under
headings of
"ASSEMBLY
NUMBERING
SYSTEM,
FUNDAMENTAL
CIRCUIT DESCRIPTION,
GENERAL
CIRCUIT ANALYSIS,
and
CIRCUIT
DESCRIP-
TIONS".
An
equivalent
circuit
of
the
instrument
is
illustrated
in
Figure
3-2.
A
system block diagram and
schematic diagrams
are
located
in
Section 8
of
the
manual.
3-3.
ASSEMBLY NUMBERING
SYSTEM.
3-4.
General
3-5.
The
following
assembly
numbering
system
has
been employed
in
the
Model
3330B
to identify
specific
assemblies
and
their electrical
components.
3-6.
Assembly
Reference
Designations.
3-7.
The Model 3330B
is
divided into
mqor
parent
assemblies designated the
letter
number
A1
through A7.
These
assemblies
and
their
respective
titles
are:
A1
Front Panel
A2
Rear
Panel
A3
Front
Mother Board
A4
Main Mother Board
A5
Rear
Mother Board
A6
Relay
Board
A7
Inner Chassis
3-8.
Assemblies contained within
major
assemblies
are
also identified
by
aletter
number
designation.
For
example,
the
Chopper
Amplifier located
on
the
A4
Main Mother
Board
has
been
assigned the
letter
number
A2. Complete
identification
of
this
assembly
is
A4A2.
3-9.
Components
located
on
each assembly
are
designa-
ted the appropriate
letter
number
Ql,
Cl,
Rl,
etc.
For
example, the
MOS
FET
transistor
on
the
Chopper
Ampli-
fier
is
designated the
letter
number
Ql. Complete
identi-
fication
of
a
component
is
then
possible
by
preceding
its
reference designation
by
the
assembly
designation.
In the
preceding
example,
Ql
is
completely
identified
by
the
designation
A4A2Q1.
3-10.
Assembly
Identifiers
3-11.
During
the
manufacturing
processes,
assembly
identifiers
have been
assigned to the
completed
printed
circuit
boards.
A
printed
circuit
board
may
be
identified
by
a
3000
series
number
that
is
silk-screened
on
the land
pattern
side
of
the assembly, or
by
a
six-digit
FLUKE
part
number
located
on
the
component
side.
3-12.
Schematic Diagram
Identifiers
3-13.
Figure
3-1
contains
a
chart
which
lists all
of
the
diagrams
associated
with
this
instrument.
These diagrams
are
located
at
the
rear
of
the
manual.
3-14.
FUNDAMENTAL
CIRCUIT
DESCRIP-
TION.
3-15.
The
circuitry
of the
Model 3330B
consists basic-
ally
of
a
high-gain operational amplifier
such
as
the
one
shown
in
Figure
3-2.
A
precision reference voltage
fur-
Advertisement
Table of Contents
