National Instruments USB-621 Series User Manual page 7

Getting Started with AI Applications in Software.........................................................4-22
Connecting Analog Input Signals on USB-6210/6211/6212 Devices...........................4-23
Connecting Floating Signal Sources ...............................................................4-25
Connecting Ground-Referenced Signal Sources .............................................4-31
Connecting Analog Input Signals on USB-6215/6216/6218 Devices...........................4-36
Taking Differential Measurements..................................................................4-36
Taking Referenced Single-Ended Measurements ...........................................4-37
Taking Non-Referenced Single-Ended Measurements ...................................4-38
Chapter 5
Analog Output
AO Range ......................................................................................................................5-2
Minimizing Glitches on the Output Signal ....................................................................5-2
Analog Output Data Generation Methods .....................................................................5-2
Analog Output Digital Triggering .................................................................................5-4
Connecting Analog Output Signals ...............................................................................5-4
Analog Output Timing Signals ......................................................................................5-5
AO Start Trigger Signal...................................................................................5-5
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What Are Floating Signal Sources? ..................................................4-25
When to Use Differential Connections with
Floating Signal Sources..................................................................4-25
When to Use Referenced Single-Ended Connections with
Floating Signal Sources..................................................................4-25
When to Use Non-Referenced Single-Ended Connections with
Floating Signal Sources..................................................................4-26
Using Differential Connections for Floating Signal Sources............4-27
Using Non-Referenced Single-Ended Connections for
Floating Signal Sources..................................................................4-30
Using Referenced Single-Ended Connections for
Floating Signal Sources..................................................................4-31
What Are Ground-Referenced Signal Sources?................................4-31
When to Use Differential Connections with
Ground-Referenced Signal Sources ...............................................4-32
When to Use Non-Referenced Single-Ended Connections with
Ground-Referenced Signal Sources ...............................................4-32
When to Use Referenced Single-Ended Connections with
Ground-Referenced Signal Sources ...............................................4-33
Using Differential Connections for Ground-Referenced
Signal Sources................................................................................4-34
Using Non-Referenced Single-Ended Connections for
Ground-Referenced Signal Sources ...............................................4-35
Using a Digital Source ......................................................................5-5
Routing AO Start Trigger to an Output Terminal.............................5-6
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Contents
NI USB-621x User Manual