专业英语Lesson 11 Computer-based Test Instruments 《测控技术与仪器英语教程》

Figure11.2 Flash-converter block diagram
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11.4 Computer Interface
• In the case of the internal PC instrument, the data bits are
transferred directly to the computer using the computer’s internal data bus
• In the design of external PC-test instruments, external box
should connect to the internal computer bus
• manufacturer attempts to standardize its interface
• The first major step toward this goal was taken by HewlettPackard in the early 1970’s with their introduction of the Hewlett-Packard Interface-Bus (HP-IB)
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11.1 Internal Adapters
• PC instruments designed for internal use are fabricated on one
or more computer adapter boards.
• A example of internal-adapter PC-test device —IS-16
cabinet external to the computer’s cabinet
• The connection between the external PC test instrument and
the computer is cable
• A example of external PC-test instrument— multifunctional
within a single clock cycle
• conversion principle
Analog-to-digital conversion is accomplished through a parallel array of voltage comparators
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analytical oscillograph
• process by the computer’s software to derive measurements
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11.2 External PC Instruments
• The external PC test instrument is housed in a conventional
Figure11.1 Successive approximation register ADC block diagram
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11.3.2 Flash Converters
• The flash converter performs a conversion and outputs data
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11.0 Personal-computer-based Test Instruments
• advantages of Personal-computer-based test instruments
Personal-computer-based test instruments have fast become the quick and easy way for companies to realize the advantages of computer-aided testing.
audio analyzer
• through the software to drive measurement
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11.3 Analog-to-digital Conversion
• Analog-to-digital converter is central to the performance of
any PC-based test instrument • Two analog-to-digital conversion methods used for PC- based
test instruments 11.3.1 successive approximation register conversion 11.3.2 flash converters
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11.5 General-purpose Interface BUS
• As the need for electronic measurements has grown in number and complexity ,only assemble individual test instruments into interactive, automated systems can reach this new needs
Lesson 11 Computer-based Test Instruments
• Backgrounds • Text tour • Language in use
– Vocabulary – Structure – Reading/writing techniques
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11.3.1 Successive Approximation Register Conversion
• the successive approximation requires very little hardware • conversion principle