National-instruments Data Acquisition Device NI USB-621x Instrukcja Użytkownika Pobierz pdf (Strona 6)

Contents

NI USB-621x User Manual vi ni.com

Chapter 4

Analog Input

Analog Input Range....................................................................................................... 4-2

Analog Input Ground-Reference Settings ..................................................................... 4-3

Configuring AI Ground-Reference Settings in Software................................ 4-5

Multichannel Scanning Considerations......................................................................... 4-5

Analog Input Data Acquisition Methods....................................................................... 4-8

Analog Input Digital Triggering.................................................................................... 4-10

Field Wiring Considerations.......................................................................................... 4-10

Analog Input Timing Signals ........................................................................................ 4-11

AI Sample Clock Signal.................................................................................. 4-14

Using an Internal Source .................................................................. 4-14

Using an External Source ................................................................. 4-14

Routing AI Sample Clock to an Output Terminal............................ 4-14

Other Timing Requirements ............................................................. 4-14

AI Sample Clock Timebase Signal ................................................................. 4-15

AI Convert Clock Signal................................................................................. 4-16

Using an Internal Source .................................................................. 4-16

Using an External Source ................................................................. 4-16

Routing AI Convert Clock to an Output Terminal ........................... 4-16

Using a Delay from Sample Clock to Convert Clock ...................... 4-17

Other Timing Requirements ............................................................. 4-17

AI Convert Clock Timebase Signal ................................................................ 4-19

AI Hold Complete Event Signal ..................................................................... 4-19

AI Start Trigger Signal.................................................................................... 4-20

Using a Digital Source...................................................................... 4-20

Routing AI Start Trigger to an Output Terminal.............................. 4-20

AI Reference Trigger Signal ........................................................................... 4-21

Using a Digital Source...................................................................... 4-22

Routing AI Reference Trigger to an Output Terminal ..................... 4-22

AI Pause Trigger Signal.................................................................................. 4-22

Using a Digital Source...................................................................... 4-22

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

What Are Floating Signal Sources?.................................................. 4-25

When to Use Differential Connections with Floating

Signal Sources ............................................................................... 4-25

When to Use Referenced Single-Ended (RSE) Connections

with Floating Signal Sources ......................................................... 4-25

When to Use Non-Referenced Single-Ended (NRSE)

Connections with Floating Signal Sources .................................... 4-26

Using Differential Connections for Floating Signal Sources ........... 4-27

1 2 3 4 5 6 7 8 9 10 11 ... 184 185

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