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National Instruments 3.21E+04 Differential Connections for Ground-Referenced Signal Sources

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Chapter 4 Signal Connections

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National Instruments Corporation 4-21 AT-MIO/AI E Series User Manual

Differential Connections for Ground-Referenced Signal Sources

Figure 4-6 shows how to connect a ground-referenced signal source to

an AT E Series board channel configured in DIFF input mode.

Figure 4-6. Differential Input Connections for Ground-Referenced Signals

With this type of connection, the PGIA rejects both the common-mode

noise in the signal and the ground potential difference between the

signal source and the AT E Series board ground, shown as Vcm in

Figure 4-6.

Ground-

Referenced

Signal

Source

Common-

Mode

Noise and

Ground

Potential

Input Multiplexers

AISENSE

Instrumentation

Amplifier

VmMeasured

Voltage

AIGND

Vcm

I/O Connector

ACH<0..7>

ACH<8..15>

Selected Channel in DIFF Configuration

PGIA

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS About This Manual Chapter 1 Introduction Chapter 2 Installation and Configuration Table of Contents Chapter 3 Hardware Overview Chapter 4 Signal Connections Chapter 5 Calibration Page Page Tables About This Manual Organization of This Manual About This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction About the AT E Series What You Need to Get Started Software Programming Choices LabVIEW and LabWindows/CVI Application Software NI-DAQ Driver Software Page Register-Level Programming Optional Equipment Custom Cabling Unpacking Installation and Configuration Software Installation Hardware Installation Board Configuration Bus Interface Plug and Play Switchless Data Acquisition Base I/O Address Selection DMA Channel Selection Interrupt Channel Selection Chapter 2 Installation and Conguration National Instruments Corporation 2-5 AT-MIO/AI E Series User Manual Table 2-1. PC AT I/O Address Map (Continued) Chapter 2 Installation and Conguration AT-MIO/AI E Series User Manual 2-6 National Instruments Corporation Table 2-2. PC AT Interrupt Assignment Map Page Hardware Overview National Instruments Corporation 3-1 AT-MIO/AI E Series User Manual DAQ - STC AT I/O Channel RTSI Bus Figure 3-2 shows the block diagram for the AT-MIO-64E-3. DAQ - STC RTSI Bus I/O Connector AT I/O Channel Figure 3-3 shows the block diagram for the AT-MIO-16E-10 and AT-MIO-16DE-10. DAQ - STC RTSI Bus I/O Connector AT I/O Channel Figure 3-4 shows a block diagram for the AT-MIO-16XE-10. Data (16) Figure 3-4. AT-MIO-16XE-10 Block Diagram Trigger Level DACs Analog Circuitry Figure 3-5 shows a block diagram for the AT-AI-16XE-10. Circuitry Figure 3-5. AT-AI-16XE-10 Block Diagram Trigger Level DACs Analog AT-MIO/AI E Series User Manual 3-6 Analog Input Input Mode Input Polarity and Input Range Page Page Considerations for Selecting Input Ranges Dither AT-MIO/AI E Series User Manual 3-12 National Instruments Corporation Figure 3-7. Dither Multiple-Channel Scanning Considerations a. Dither disabled; no averaging b. Dither disabled; average of 50 acquisitions d. Dither enabled; average of 50 acquisitions c. Dither enabled; no averaging Page Analog Output Analog Output Reference Selection Analog Output Polarity Selection Analog Output Reglitch Selection Analog Trigger Page Page Page Digital I/O Timing Signal Routing Programmable Function Inputs Board and RTSI Clocks RTSI Triggers AT-MIO/AI E Series User Manual 3-22 National Instruments Corporation Figure 3-15. RTSI Bus Signal Connection Signal Connections I/O Connector AT-MIO/AI E Series User Manual 4-2 National Instruments Corporation Figure 4-2. I/O Connector Pin Assignment for the AT-MIO-64E-3 National Instruments Corporation 4-3 AT-MIO/AI E Series User Manual Figure 4-3. I/O Connector Pin Assignment for the AT-MIO-16DE-10 AT-MIO/AI E Series User Manual 4-4 National Instruments Corporation National Instruments Corporation 4-5 AT-MIO/AI E Series User Manual I/O Connector Signal Descriptions AT-MIO/AI E Series User Manual 4-6 National Instruments Corporation National Instruments Corporation 4-7 AT-MIO/AI E Series User Manual AT-MIO/AI E Series User Manual 4-8 National Instruments Corporation Table 4-1 shows the I/O signal summary for the AT-MIO-16E-1, AT-MIO-16E-2 and AT-MIO-64E-3. Table 4-1. I/O Signal Summary, AT-MIO-16E-1, AT-MIO-16E-2, and AT-MIO-64E-3 National Instruments Corporation 4-9 AT-MIO/AI E Series User Manual Table 4-1. I/O Signal Summary, AT-MIO-16E-1, AT-MIO-16E-2, and AT-MIO-64E-3 (Continued) AT-MIO/AI E Series User Manual 4-10 National Instruments Corporation Table 4-2 shows the I/O signal summary for the AT-MIO-16E-10 and AT-MIO-16DE-10. Table 4-2. I/O Signal Summary, AT-MIO-16E-10 and AT-MIO-16DE-10 National Instruments Corporation 4-11 AT-MIO/AI E Series User Manual Table 4-2. I/O Signal Summary, AT-MIO-16E-10 and AT-MIO-16DE-10 (Continued) AT-MIO/AI E Series User Manual 4-12 National Instruments Corporation Table 4-3 shows the I/O signal summary for the AT-MIO-16XE-10 and AT-AI-16XE-10. Table 4-3. I/O Signal Summary, AT-MIO-16XE-10 and AT-AI-16XE-10 National Instruments Corporation 4-13 AT-MIO/AI E Series User Manual Table 4-3. I/O Signal Summary, AT-MIO-16XE-10 and AT-AI-16XE-10 (Continued) AT-MIO/AI E Series User Manual 4-14 National Instruments Corporation Table 4-4 shows the I/O signal summary for the AT-MIO-16XE-50. Table 4-4. I/O Signal Summary, AT-MIO-16XE-50 National Instruments Corporation 4-15 AT-MIO/AI E Series User Manual Table 4-4. I/O Signal Summary, AT-MIO-16XE-50 (Continued) Analog Input Signal Connections - Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Configurations National Instruments Corporation 4-19 AT-MIO/AI E Series User Manual Figure 4-5 summarizes the recommended input configuration for both types of signal sources. Figure 4-5. Summary of Analog Input Connections Differential Connection Considerations (DIFF Input Configuration) National Instruments Corporation 4-21 AT-MIO/AI E Series User Manual Differential Connections for Ground-Referenced Signal Sources Figure 4-6. Differential Input Connections for Ground-Referenced Signals Differential Connections for Nonreferenced or Floating Signal Sources Page Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Configuration) Single-Ended Connections for Grounded Signal Sources (NRSE Configuration) Common-Mode Signal Rejection Considerations Analog Output Signal Connections Digital I/O Signal Connections Page Power Connections Timing Connections Programmable Function Input Connections Data Acquisition Timing Connections SCANCLK Signal EXTSTROBE* Signal TRIG1 Signal Page TRIG2 Signal STARTSCAN Signal AT-MIO/AI E Series User Manual 4-38 National Instruments Corporation Figures 4-21 and 4-22 show the input and output timing requirements for the STARTSCAN signal Figure 4-21. STARTSCAN Input Signal Timing b. Scan in Progress, Two Conversions per Scan Figure 4-22. STARTSCAN Output Signal Timing a. Start of Scan CONVERT* Signal Page AIGATE Signal SISOURCE Signal Waveform Generation Timing Connections WFTRIG Signal UPDATE* Signal Page UISOURCE Signal General-Purpose Timing Signal Connections GPCTR0_SOURCE Signal GPCTR0_GATE Signal GPCTR0_OUT Signal GPCTR0_UP_DOWN Signal GPCTR1_SOURCE Signal GPCTR1_GATE Signal GPCTR1_OUT Signal National Instruments Corporation 4-51 AT-MIO/AI E Series User Manual GPCTR1_UP_DOWN Signal Figure 4-37. GPCTR Timing Summary FREQ_OUT Signal Timing Specifications for Digital I/O Ports A, B, and C Page Mode 1 Input Timing Mode 1 Output Timing Mode 2 Bidirectional Timing Field Wiring Considerations Calibration Loading Calibration Constants Self-Calibration External Calibration Other Considerations Specifications A AT-MIO-16E-1, AT-MIO-16E-2 and AT-MIO-64E-3 Page Page Page Page Page Page Page Analog Trigger Page AT-MIO-16E-10 and AT-MIO-16DE-10 Page Page Page Page Appendix A Specications for AT-MIO-16E-10 and AT-MIO-16DE-10 AT-MIO/AI E Series User Manual A-16 National Instruments Corporation Handshaking (AT-MIO-16DE-10 only)................3-wire Digital logic levels............ PA<0..7>, PB<0..7>, PC<0..7> ....................... Digital Trigger RTSI Bus Interface Page AT-MIO-16XE-10 and AT-AI-16XE-10 Page Page Analog Output (AT-MIO-16XE-10 only) Page Analog Trigger Page AT-MIO-16XE-50 Page Page Page Page Page Optional Cable Connector Descriptions B Figure B-1. 68-Pin MIO Connector Pin Assignments AT-MIO/AI E Series User Manual B-2 National Instruments Corporation National Instruments Corporation B-3 AT-MIO/AI E Series User Manual Figure B-2. 68-Pin DIO Connector Pin Assignments AT-MIO/AI E Series User Manual B-4 National Instruments Corporation Figure B-3. 68-Pin Extended Analog Input Connector Pin Assignments National Instruments Corporation B-5 AT-MIO/AI E Series User Manual Figure B-4. 50-Pin MIO Connector Pin Assignments AT-MIO/AI E Series User Manual B-6 National Instruments Corporation Figure B-5. 50-Pin DIO Connector Pin Assignments National Instruments Corporation B-7 AT-MIO/AI E Series User Manual Figure B-6. 50-Pin Extended Analog Input Connector Pin Assignments Common Questions C General Information Installation and Configuration Analog Input and Output Page Timing and Digital I/O Page Page Page Customer Communication D Electronic Services Bulletin Board Support FTP Support Fax and Telephone Support Telephone Fax FaxBack Support E-Mail Support (currently U.S. only) Technical Support Form AT E Series Hardware and Software Configuration Form National Instruments Products Other Products Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Symbols Glossary A B C D E F Page Page T U V W Index Symbols A Page B C D Page E F G H I L M N O P Page Q R S Page Page T U V W