Section 3
Theory of
Operation
3-1.
INTRODUCTION
This
section
of the manual describes the theory of operation for the Generator. There
are
four major
headings:
General Description
Functional Description
Software Operation
Detailed
Circuit Descriptions
The
General Description
briefly explains
the functions
and
components of the three
major modules of the Generator. The Functional Description covers the main
output
parameters, amplitude, frequency, and modulation. The Software Operation section
describes the software and how it affects the hardware. The Circuit
Description is a
comprehensive explanation of the operation of each circuit assembly.
3-2.
GENERAL
DESCRIPTION
The Generator has
three
major
sections. The front
section includes
the keyboard and
display for local control. The module section includes the frequency, level,
modulation,
and control circuits. The rear section includes the power supply, cooling fan, and
assorted
external connectors.
3-3. Front Section
The front
section of
the Generator provides the operator interface. It includes the
primary
controls, connectors, and indicators of the
Generator,
All
front panel keys and displays
(except
the power switch that controls the power supply directly) are
monitored and
handled by
the Controller in the module section.
3-4.
Module Section
The module section is a multi-compartmented, shielded enclosure that
includes the
circuits that generate the instrument stimulus
functions:
frequency, modulation, and
amplitude. The Controller
is
also located here. The Controller governs the
Generator
operation and at power-on determines if any options are installed by
checking the option
status bits. The optional Low-Rate FM, is also located in
this section of the instrument.
3-5.
Rear Section
The rear section includes the power supply, the cooling
fan, various external connectors,
the IEEE-488 Interface and the High-Stability Reference Options.
3-1
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