Specifications

Chapter 2
Theory of Operation
2-1 INTRODUCTION This chapter provides a brief overview of the functional assemblies and
major parts that comprise a typical MS462XX Vector Network Measure
-
ment System. It also briefly describes the operation of each major assem
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bly.
2-2 SYSTEM
OVERVIEW
MS462XA/B Series Vector Network Measurement Systems are ratio mea
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surement systems used to measure complex vector signal characteristics
of devices and systems in the 10 MHz to 9 GHz range. They also incorpo
-
rate special measurement capabilities such as Noise Figure measure
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ment, Intermodulated Distortion measurement, and more.
The MS462XC Series Vector Network Measurement Systems are config-
ured as Direct Access Receivers for antenna, frequency conversion, and
multiple output device measurements in the 10 MHz to 9 GHz range.
They also maintain the ability to measure all four S-parameters with the
addition of a reflectometer setup at the front end of the receiver.
The MS462XD Series Vector Network Measurement Systems are used to
measure complex vector signal characteristics of multiport balanced/dif-
ferential devices and systems in the 10 MHz to 9 GHz range.
The MS462XX performs complex vector signal measurements by sourcing
a stimulus signal to the Device Under Test (DUT) connected to the front
panel Port 1, Port 2, Port 3 (optional for MS462XB), or Port 4 (for
MS462XD) connectors. It simultaneously measures the DUT response,
which consists of reflected or transmitted (attenuated or amplified) sig
-
nals at the connectors of the DUT. The reflected or transmitted signal(s)
and a sample of the stimulus signal are down converted to 125 kHz inter
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mediate frequency (IF) signals.
These IF signals are then converted into digital information and sent to
the Central Processor Module where the digital information is processed
by a Digital Signal Processor (DSP) using Single Frequency Digital Fou
-
rier Transfer to determine the magnitude and phase of the signal being
measured. The information is then normalized for the desired S-parame
-
ter and presented to the user via the front panel color LCD display. The
display information is also available on the rear panel VGA Out connec
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tor for use with an external VGA monitor.
The normalized measurement information is also available on the rear
panel Printer Out connector and Dedicated GPIB connector for use with
an external printer and plotter respectively.
MS462XX MM 2-3