Service
Model
83522A
83522A RF PLUG-IN SIMPLIFIED BLOCK DIAGRAM DESCRIPTION
The operating principles of the 83522A RF Plug-in are described in two levels.
The Functional Block Diagram Description describes major functional areas of
the instrument. The Troubleshooting Block Diagram Description discusses the
theory in greater depth, and outlines the breakdown of functions among the
various instrument assemblies.
FUNCTIONAL BLOCK DIAGRAM DESCRIPTION
The HP Model 83522A RF Plug-In, used with the 8350A Sweep Oscillator,
covers the 0.01 to 2.4
GHz frequency range with
+
13 dBm of leveled RF power.
Internal crystal markers, at 1, 10, or 50 MHz intervals, are available to produce
Z-axis intensity markers or 1 dB amplitude markers up to 2.4
GHz (below
1
Ghz
for the 1 MHz markers). In addition to internal leveling, external detectors or
power meters can be used to level the RF power. Furthermore, the
83522A can
sweep power proportional to either frequency or sweep.
The
83522A can be broken down into five functional sections:
Digital Control and Front Panel
Frequency Control
Power Control (ALC)
Marker Generation
RF Section
The functional description for each of these five functions is described briefly
below.
Digital Control/Front Panel
The entire 83522A is digitally controlled by a microprocessor in the Model
8350A. It must be emphasized that nearly all functions are commanded by the
8350A; very few activities take place without microprocessor intervention.
The Digital Control section of the
83522A is the focal point of all
communication between plug-in and
8350A. It receives commands ordered by
the microprocessor along the
8350A's instrument bus. Once in the 835224 these
commands are decoded and routed to the appropriate part of the plug-in to
control virtually every capability. The Digital Control section also contains a
block of Read Only Memory (ROM), which provides the microprocessor with
the constants and program software tailored to the plug-in. The Digital Control
section, then, is the "control center" for the entire plug-in.
The Front Panel Interface is the communication link between the Front Panel
displays or controls and, via the
8350A microprocessor, the rest of the plug-in. It
receives and stores information to be presented by the numerical display or
annunciators through the Digital Control block, and continuously refreshes the
display. It also receives the user's commands through the Front Panel
pushbuttons and Rotary Pulse Generator (RPG), and sends them back through
the Digital Control block to the
8350A microprocessor. Certain analog signals,
such as FREQ CAL, pass through the Front Panel Interface to the appropriate
part of the
83522A.
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