National Instruments NI USB-621x manual 7

	Contents
AI Pause Trigger Signal ..................................................................................	4-23
Using a Digital Source ......................................................................	4-23
Getting Started with AI Applications in Software.........................................................	4-24
Chapter 5
Connecting AI Signals on the USB-6210/6211 Devices
Connecting Floating Signal Sources..............................................................................	5-3
What Are Floating Signal Sources? ................................................................	5-3
When to Use Differential Connections with Floating Signal Sources ............	5-3
When to Use Referenced Single-Ended (RSE) Connections with
Floating Signal Sources ................................................................................	5-3
When to Use Non-ReferencedSingle-Ended (NRSE) Connections
with Floating Signal Sources........................................................................	5-4
Using Differential Connections for Floating Signal Sources ..........................	5-5
Using Non-ReferencedSingle-Ended (NRSE) Connections for
Floating Signal Sources ................................................................................	5-8
Using Referenced Single-Ended (RSE) Connections for Floating
Signal Sources ..............................................................................................	5-9
Connecting Ground-Referenced Signal Sources ...........................................................	5-9
What Are Ground-Referenced Signal Sources? ..............................................	5-9
When to Use Differential Connections with Ground-Referenced
Signal Sources ..............................................................................................	5-10
When to Use Non-ReferencedSingle-Ended (NRSE) Connections with
Ground-Referenced Signal Sources..............................................................	5-10
When to Use Referenced Single-Ended (RSE) Connections with
Ground-Referenced Signal Sources..............................................................	5-11
Using Differential Connections for Ground-Referenced Signal Sources........	5-12
Using Non-ReferencedSingle-Ended (NRSE) Connections for
Ground-Referenced Signal Sources..............................................................	5-13
Chapter 6
Connecting AI Signals on the USB-6215/6218 Devices
Differential Measurements ............................................................................................	6-1
Differential Pairs............................................................................................................	6-1
Referenced Single-Ended (RSE) Measurements ...........................................................	6-3
Non-ReferencedSingle-Ended (NRSE) Measurements ................................................	6-4

© National Instruments Corporation vii NI USB-621x User Manual