National Instruments Data Acquisition Device NI USB-621x - Manual (Page 7)

Contents
© National Instruments Corporation vii NI USB-621x User Manual
Using Non-Referenced Single-Ended (NRSE) Connections
for Floating Signal Sources ............................................................4-30
Using Referenced Single-Ended (RSE) Connections for
Floating Signal Sources..................................................................4-31
Connecting Ground-Referenced 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 (NRSE)
Connections with Ground-Referenced Signal Sources ..................4-32
When to Use Referenced Single-Ended (RSE) Connections with
Ground-Referenced Signal Sources ...............................................4-33
Using Differential Connections for Ground-Referenced
Signal Sources ................................................................................4-33
Using Non-Referenced Single-Ended (NRSE) Connections for
Ground-Referenced Signal Sources ...............................................4-34
Connecting Analog Input Signals on USB-6215/6216/6218 Devices...........................4-36
Taking Differential Measurements..................................................................4-36
Taking Referenced Single-Ended (RSE) Measurements ................................4-37
Taking Non-Referenced Single-Ended (NRSE) 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 .................................................................................5-3
Connecting Analog Output Signals ...............................................................................5-4
Analog Output Timing Signals ......................................................................................5-4
AO Start Trigger Signal...................................................................................5-5
Using a Digital Source ......................................................................5-5
Routing AO Start Trigger to an Output Terminal.............................5-6
AO Pause Trigger Signal.................................................................................5-6
Using a Digital Source ......................................................................5-7
AO Sample Clock Signal.................................................................................5-7
Using an Internal Source...................................................................5-7
Using an External Source..................................................................5-8
Routing AO Sample Clock to an Output Terminal...........................5-8
Other Timing Requirements..............................................................5-8
AO Sample Clock Timebase Signal ................................................................5-8
Getting Started with AO Applications in Software .......................................................5-9