National Instruments DAQ X NI 634 Series User Manual page 7

Contents
Signal Conditioning .......................................................................................................... 2-8
Sensors and Transducers...........................................................................................2-8
Signal Conditioning Options .................................................................................... 2-9
SCXI ................................................................................................................. 2-9
SCC................................................................................................................... 2-9
Programming Devices in Software ................................................................................... 2-10
Chapter 3
Connector and LED Information
I/O Connector Signal Descriptions ................................................................................... 3-2
+5 V Power Source ........................................................................................................... 3-5
USER 1 and USER 2 ........................................................................................................ 3-5
PCI Express Device Disk Drive Power Connector........................................................... 3-6
When to Use the Disk Drive Power Connector ........................................................ 3-6
Disk Drive Power Connector Installation ................................................................. 3-6
RTSI Connector Pinout..................................................................................................... 3-7
USB Device LED Patterns................................................................................................ 3-7
Chapter 4
Analog Input
Analog Input on MIO X Series Devices ........................................................................... 4-1
Analog Input Range .................................................................................................. 4-2
Working Voltage Range ...........................................................................................4-3
Analog Input Ground-Reference Settings................................................................. 4-4
Configuring AI Ground-Reference Settings in Software ................................. 4-6
Multichannel Scanning Considerations .................................................................... 4-6
Analog Input Data Acquisition Methods .................................................................. 4-9
Software-Timed Acquisitions ........................................................................... 4-9
Hardware-Timed Acquisitions.......................................................................... 4-9
Analog Input Triggering ...........................................................................................4-10
Connecting Analog Input Signals ............................................................................. 4-10
Connecting Floating Signal Sources......................................................................... 4-12
What Are Floating Signal Sources?.................................................................. 4-12
When to Use Differential Connections with Floating Signal Sources.............. 4-12
When to Use Non-Referenced Single-Ended (NRSE) Connections
with Floating Signal Sources ......................................................................... 4-12
When to Use Referenced Single-Ended (RSE) Connections
with Floating Signal Sources ......................................................................... 4-13
Using Differential Connections for Floating Signal Sources ........................... 4-13
Using Non-Referenced Single-Ended (NRSE) Connections
for Floating Signal Sources ........................................................................... 4-16
Using Referenced Single-Ended (RSE) Connections
for Floating Signal Sources ........................................................................... 4-17
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