National Instruments PXIe-4480, Руководство пользователя, Страница: 5 / 37

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Contents
Chapter 1
Getting Started
Installation ........................................................................................................................ 1-1
Specifications.................................................................................................................... 1-2
Accessories ....................................................................................................................... 1-2
Chapter 2
Using the Module
Input Connector Pinouts ................................................................................................... 2-1
Signal Descriptions........................................................................................................... 2-2
Connecting Signals ................................................................................................... 2-3
Front Panel LED Status .................................................................................................... 2-5
Block Diagrams ................................................................................................................ 2-6
Channel Types .................................................................................................................. 2-8
Channel Configuration ..................................................................................................... 2-8
Input Connections..................................................................................................... 2-9
Input Coupling.................................................................................................................. 2-10
IEPE Excitation ................................................................................................................ 2-11
Transducer Electronic Data Sheet .................................................................................... 2-11
Voltage Excitation ............................................................................................................ 2-11
Fault Conditions ............................................................................................................... 2-13
IEPE Open and IEPE Short ...................................................................................... 2-13
Voltage Excitation Current Limit ............................................................................. 2-13
Overtemperature Detection....................................................................................... 2-14
Chapter 3
Signal Acquisition
Analog-to-Digital Converter............................................................................................. 3-1
Nyquist Frequency and Nyquist Bandwidth..................................................................... 3-1
Operation Modes .............................................................................................................. 3-1
Frequency Domain Mode Acquisitions.................................................................... 3-2
Anti-Alias Filters .............................................................................................. 3-2
Passband ........................................................................................................... 3-3
Stopband ........................................................................................................... 3-3
Alias-Free Bandwidth....................................................................................... 3-3
Filter Group Delay............................................................................................ 3-3
Time Domain Mode Acquisitions ............................................................................ 3-4
Analog Front End ............................................................................................. 3-4
Delta-Sigma ADC Modulator........................................................................... 3-4
Low Pass FIR Filter.......................................................................................... 3-5
1/n Decimation ................................................................................................. 3-7