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National Instruments NI PXI-4224 Synchronizing the NI PXI-4224 Using LabVIEW

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Chapter 5 Using the NI PXI-4224

NI PXI-4224 User Manual 5-10 ni.com

Synchronizing the NI PXI-4224 Using LabVIEW

This section describes in more detail the steps shown in Figure 5-2, such

as how to create a task in LabVIEW and configure the channels of the

NI PXI-4224. For further instructions, select Help»VI, Function, &

How-To Help from the LabVIEW menu bar.

Note Except where otherwise stated, the VIs in Table 5-3 are located on the Functions»

All Functions»NI Measurements»DAQmx - Data Acquisition subpalette and

accompanying subpalettes in LabVIEW.

Table 5-3. Synchronizing the NI PXI-4224 Using LabVIEW

Flowchart Step VI or Program Step

Create a Master Task

(optional)

DAQmx Create Task.vi—This VI is optional if you created

and configured your task using the DAQ Assistant. However, if

you use it in LabVIEW, any changes you make to the task will not

be saved to a task in MAX.

Create Master AI Voltage

Channels

DAQmx Create Virtual Channel.vi (AI Voltage by

default).

Configure Master Channels Use a DAQmx Channel Property Node. Refer to the Using a

DAQmx Channel Property Node in LabVIEW section for more

information.

Configure Master Timing DAQmx Timing.vi (Sample Clock by default).

Get Master Timebase Source

and Rate from Master Task

Use a DAQmx Timing Property Node to get

MasterTimebase.Src and MasterTimebase.Rate.

Create a Slave Task

(optional)

DAQmx CreateTask.vi—This VI is optional if you created and

configured your task using the DAQ Assistant. However, if you

use it in LabVIEW, any changes you make to the task will not be

saved to a task in MAX.

Create Slave AI Voltage

Channels

DAQmx Create Virtual Channel.vi (AI Voltage by

default).

Configure Slave Channels DAQmx Channel Property Node. Refer to the Using a DAQmx

Channel Property Node in LabVIEW section for more

information.

Configure Slave Timing DAQmx Timing.vi (Sample Clock by default).

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Conventions Contents Page Figures Tables About the NI PXI-4224 What You Need to Get Started National Instruments Documentation Installing the Application Software, NI-DAQ, and the DAQ Device Installing the NI PXI-4224 LED Pattern Descriptions Connecting Signals Connecting Signals to the NI PXI-4224 Front Signal Connector Page Analog Input Connections Page Figure 2-3. Unshielded Grounded Signal Source Connection Using a D-SUB Connector Figure 2-4. Shielded Floating Signal Source Connection Using a D-SUB Connector Figure 2-5. Shielded Grounded Signal Source Connection Using a D-SUB Connector Figures 2-6 through 2-9 illustrate connecting signals using a terminal block. Figure 2-6. Unshielded Floating Signal Source Connection Using a Terminal Block Figure 2-7. Unshielded Grounded Signal Source Connection Using a Terminal Block Figure 2-8. Shielded Floating Signal Source Connection Using a Terminal Block Floating Signal Source Connection Ground-Referenced Signal Connection Shielded Ground-Referenced Signal Connection (Recommended) Configuring and Testing Verifying and Self-Testing the Signals Using Test Panels Configuring the NI PXI-4224 in MAX Creating a Voltage Task or Global Channel Using NI-DAQmx Verifying and Self-Testing an NI-DAQmx Task or Global Channel Page Chapter 4 Theory of Operation Figure 4-1. Block Diagram of NI PXI-4224 NI PXI-4224 User Manual 4-2 ni.com Signal Conditioning Functional Overview Measurement Considerations Input Impedance Common-Mode Rejection Ratio Effective CMR Timing and Control Functional Overview Programmable Function Inputs Device and PXI Clocks Figure 4-4 shows this signal connection scheme. Figure 4-4. NI PXI-4224 PXI Trigger Bus Signal Connection Page Using the NI PXI-4224 Developing Your Application Typical Program Flow Chart Figure 5-1. Typical Program Flowchart Overview of Typical Flow Chart Creating a Task Using DAQ Assistant or Programmatically Adjusting Timing and Triggering Configuring Channel Properties Acquiring, Analyzing, and Presenting Completing the Application Developing an Application Using LabVIEW Page Using a DAQmx Channel Property Node in LabVIEW Synchronization and Triggering Synchronizing the NI PXI-4224 Figure 5-2. General Synchronizing Flowchart Synchronizing the NI PXI-4224 Using LabVIEW Other Application Documentation and Material Calibrating the NI PXI-4224 Loading Calibration Constants Self-Calibration External Calibration A Specifications Overvoltage Protection Analog Input Accuracy Transfer Characteristics Calibration Pre-Calibration Errors Memory Digital Triggers PXI Trigger Bus PCI Bus Interface Power Requirements Physical Maximum Working Voltage Isolation Voltages Environmental Safety Electromagnetic Compatibility CE Compliance Online Product Certification Environmental Management RoHS B Timing Signal Information Connecting Timing Signals Programmable Function Input Connections DAQ Timing Connections AI START TRIG Signal AI REF TRIG Signal AI SAMP CLK Signal Page AI CONV CLK Signal AI PAUSE TRIG Signal AI SAMPLE CLK TIMEBASE Signal AI HOLD COMPLETE Signal C Removing the NI PXI-4224 Removing the NI PXI-4224 from a PXI or PXI/SCXI Combination Chassis Removing the NI PXI-4224 from MAX D Common Questions Page Glossary Symbols A B C D E F G H I K L M N O P R S T V Page Index A B C D E F G H I L O P Q R S T V