National Instruments NI cDAQ-9139 User Manual page 7

Contents
Chapter 2
Analog Input
Analog Input Triggering Signals ...................................................................................... 2-1
Analog Input Timing Signals............................................................................................ 2-1
AI Sample Clock Signal ...........................................................................................2-2
Routing the Sample Clock to an Output Terminal ........................................... 2-2
AI Sample Clock Timebase Signal ........................................................................... 2-2
AI Convert Clock Signal Behavior For Analog Input Modules ............................... 2-2
Scanned Modules.............................................................................................. 2-3
Simultaneous Sample-and-Hold Modules ........................................................ 2-3
Sigma-Delta Modules ....................................................................................... 2-3
Slow Sample Rate Modules.............................................................................. 2-4
AI Start Trigger Signal ............................................................................................. 2-4
Using a Digital Source ...................................................................................... 2-5
Using an Analog Source ................................................................................... 2-5
Routing AI Start Trigger to an Output Terminal .............................................. 2-5
AI Reference Trigger Signal..................................................................................... 2-5
Using a Digital Source ...................................................................................... 2-6
Using an Analog Source ................................................................................... 2-6
Routing the Reference Trigger Signal to an Output Terminal.......................... 2-6
AI Pause Trigger Signal............................................................................................ 2-7
Using a Digital Source ...................................................................................... 2-7
Using an Analog Source ................................................................................... 2-7
Getting Started with AI Applications in Software............................................................ 2-7
Chapter 3
Analog Output
Analog Output Data Generation Methods ........................................................................ 3-1
Software-Timed Generations .................................................................................... 3-1
Hardware-Timed Generations................................................................................... 3-2
Buffered Analog Output ................................................................................... 3-2
Analog Output Triggering Signals.................................................................................... 3-3
Analog Output Timing Signals ......................................................................................... 3-3
AO Sample Clock Signal .......................................................................................... 3-3
Routing AO Sample Clock to an Output Terminal........................................... 3-4
AO Sample Clock Timebase Signal ......................................................................... 3-4
AO Start Trigger Signal ............................................................................................ 3-4
Using a Digital Source ...................................................................................... 3-4
Using an Analog Source ................................................................................... 3-4
Routing AO Start Trigger Signal to an Output Terminal ................................. 3-5
AO Pause Trigger Signal .......................................................................................... 3-5
Using a Digital Source ...................................................................................... 3-5
Using an Analog Source ................................................................................... 3-5
Minimizing Glitches on the Output Signal .......................................................................3-6
Getting Started with AO Applications in Software .......................................................... 3-6
vi | ni.com