National Instruments Data Acquisition Device NI USB-621x, Руководство пользователя

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Contents
© National Instruments Corporation vii NI USB-621x User Manual
Using Non-Referenced Single-Ended (NRSE) Connections
for Floating Signal So u rces ............................................................4-30
Using Referenced Single-Ended (RSE) Connections for
Floating Signal So u rces..................................................................4-31
Connecting Gro u nd-Referenced Signal So u rces .............................................4-31
What Are Gro u nd-Referenced Signal So u rces?................................4-31
When to Use Differential Connections with Gro u nd-Referenced
Signal So u rces ................................................................................4-32
When to Use Non-Referenced Single-Ended (NRSE)
Connections with Gro u nd-Referenced Signal So u rces ..................4-32
When to Use Referenced Single-Ended (RSE) Connections with
Gro u nd-Referenced Signal So u rces ...............................................4-33
Using Differential Connections for Gro u nd-Referenced
Signal So u rces ................................................................................4-33
Using Non-Referenced Single-Ended (NRSE) Connections for
Gro u nd-Referenced Signal So u rces ...............................................4-34
Connecting Analog Inp u t Signals on USB-6215/6216/6218 Devices...........................4-36
Taking Differential Meas u rements..................................................................4-36
Taking Referenced Single-Ended (RSE) Meas u rements ................................4-37
Taking Non-Referenced Single-Ended (NRSE) Meas u rements .....................4-38
Chapter 5
Analog Output
AO Range ......................................................................................................................5-2
Minimizing Glitches on the O
u tp u t Signal ....................................................................5-2
Analog O u tp u t Data Generation Methods .....................................................................5-2
Analog O u tp u t Digital Triggering .................................................................................5-3
Connecting Analog O u tp u t Signals ...............................................................................5-4
Analog O u tp u t Timing Signals ......................................................................................5-4
AO Start Trigger Signal...................................................................................5-5
Using a Digital So u rce ......................................................................5-5
Ro u ting AO Start Trigger to an O u tp u t Terminal.............................5-6
AO Pa u se Trigger Signal.................................................................................5-6
Using a Digital So u rce ......................................................................5-7
AO Sample Clock Signal.................................................................................5-7
Using an Internal So u rce...................................................................5-7
Using an External So u rce..................................................................5-8
Ro u ting AO Sample Clock to an O u tp u t Terminal...........................5-8
Other Timing Req u irements..............................................................5-8
AO Sample Clock Timebase Signal ................................................................5-8
Getting Started with AO Applications in Software .......................................................5-9