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Introduction to the System
Operating Principles
Operating Principles
The software of the HP 81200 Data Generator/Analyzer Platform is based
on two concepts:
• the idea of virtual machines
• the idea of keeping models of the real world—a model of the present
instrument configuration and a model of the DUT
This section explains the interdependencies and terms.
"Virtual Instruments/Systems"
"Hardware and Setup Models" on page 27
"Software Structure" on page 28
Virtual Instruments/Systems
In practice, one mainframe can house several independent clock modules
with associated data generator/analyzer modules. This makes it possible to
test a device under asynchronous conditions.
The concept of the HP 81200 system is to create so-called virtual
instruments out of the system's present hardware resources (generator and
analyzer channels).
By editing the dvtsys.txt configuration file, new virtual instruments can be
created. New modules added to the HP 81200 system are automatically
added to the dvtits.txt configuration file.
The basic (default) instrument is called DSRA (DSR = digital stimulus and
response). Additional instruments may have suffixes or ascending names,
such as DSRB, DSRC, and so on.
N O T E
The user interface and remote control commands enable you to load and
operate any of the configured instruments. The Windows NT operating
system also enables you to operate several instruments in parallel.
If you are operating the system remotely via SCPI commands, the system
names are used to construct the handles for identifying the respective
instrument.
26
HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1
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