Manuals / Brands / Home Audio / Stereo Receiver / National Instruments / Home Audio / Stereo Receiver

National Instruments NI PXI-4224 Ground-Referenced Signal Connection, Shielded Ground-Referenced Signal Connection (Recommended)

1 85

Download 85 pages, 1.21 Mb

Chapter 2 Connecting Signals

NI PXI-4224 User Manual 2-12 ni.com

Ground-Referenced Signal Connection

Figures 2-3, 2-5, 2-7, and 2-9 illustrate the ground-referenced signal

connection. In this configuration, the voltage source being measured is

referenced to its own ground reference that is connected through a

conductive path to the instrument ground reference. For example, the path

can be through a common earth ground or through the power line ground.

To connect a ground-reference signal source to the NI PXI-4224, the signal

(VSIG +) is connected to the NI PXI-4224 channel (AI X+). The signal

reference (VSIG –) is connected to the channel reference (AI X–).

Shielded Ground-Referenced Signal Connection

(Recommended)

Figures 2-5 and 2-9 illustrate shielded ground-referenced signal

connections. The connection to this signal source is identical to the

ground-referenced signal connection with the addition of shielding

around the field wiring. The shielding is grounded at the signal source

ground (VSIG Ground Reference). Connect the signal (VSIG +) to the

NI PXI-4224 channel (AI X+). Connect the signal reference (VSIG –) to the

channel reference (AI X–).

This shielding scheme is effective at reducing capacitive or electrically

coupled noise. The same concerns regarding the difference in ground

potentials, discussed in the Ground-Referenced Signal Connection section,

also apply to this configuration.

For more information about the function of the NI PXI-4224 and other

measurement considerations, refer to Chapter 4, Theory of Operation.

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