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National Instruments PCI-6023E, PCI-6024E, PCI-6025E Differential Connections for Ground-Referenced Signal Sources

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Chapter 4 Signal Connections

PCI-6023E/6024E/6025E User Manual 4-14

National Instruments Corporation

Differential Connections for Ground-Referenced Signal Sources

Figure 4-5 shows how to connect a ground-referenced signal source to a

channel on the board configured in DIFF input mode.

Figure 4-5. 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 board ground, shown as Vcm in Figure 4-5.

Ground-

Referenced

Signal

Source

Common-

Mode

Noise and

Ground

Potential

Input Multiplexers

AISENSE

Instrumentation

Amplifier

VmMeasured

Voltage

AIGND

Vcm

I/O Connector

ACH+

ACH-

Selected Channel in DIFF Configuration

PGIA

Programmable Gain

PCI.book Page 14 Wednesday, September 16, 1998 9:09 AM

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Contents Chapter 4 Signal Connections Page Glossary Index Figures Tables About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction Features of the PCI-6023E, PCI-6024E, and PCI-6025E What You Need to Get Started Unpacking Software Programming Choices National Instruments Application Software NI-DAQ Driver Software Page Register-Level Programming Optional Equipment Installation and Configuration Software Installation Hardware Configuration Hardware Installation National Instruments Corporation 3-1 PCI-6023E/6024E/6025E User Manual PCI.book Page 1 Wednesday, September 16, 1998 9:09 AM Hardware Overview DAQ - STC I/O Connector Figure 3-1. PCI-6023E, PCI-6024E, and PCI-6025E Block Diagram PCI Connector Analog Input Input Mode Input Range Dither Chapter 3 Hardware Overview PCI.book Page 4 Wednesday, September 16, 1998 9:09 AM PCI-6023E/6024E/6025E User Manual 3-4 National Instruments Corporation Multichannel 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 d. Dither enabled; average of 50 acquisitions Analog Output Analog Output Glitch Digital I/O Timing Signal Routing Programmable Function Inputs Board and RTSI Clocks RTSI Triggers Chapter 3 Hardware Over view National Instruments Corporation 3-9 PCI-6023E/6024E/6025E User Manual Figure 3-4. RTSI Bus Signal Connection Signal Connections I/O Connector Figure 4-1. I/O Connector Pin Assignment for the PCI-6023E/PCI-6024E PCI-6023E/6024E/6025E User Manual 4-2 National Instruments Corporation Figure 4-2. I/O Connector Pin Assignment for the PCI-6025E PCI.book Page 3 Wednesday, September 16, 1998 9:09 AM National Instruments Corporation 4-3 PCI-6023E/6024E/6025E User Manual PCI-6023E/6024E/6025E User Manual 4-4 National Instruments Corporation Table4-1 shows the I/O connector signal descriptions for the PCI-6023E, PCI-6024E, and PCI-6025E. Table 4-1. I/O Connector Signal Descriptions National Instruments Corporation 4-5 PCI-6023E/6024E/6025E User Manual Table 4-1. I/O Connector Signal Descriptions (Continued) PCI-6023E/6024E/6025E User Manual 4-6 National Instruments Corporation Table 4-1. I/O Connector Signal Descriptions (Continued) National Instruments Corporation 4-7 PCI-6023E/6024E/6025E User Manual Table4-2 shows the I/O signal summary for the PCI-6023E, PCI-6024E, and PCI-6025E. Table 4-2. I/O Signal Summary Analog Input Signal Overview Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Analog Input Modes - Analog Input Signal Connections Figure 4-4. Summary of Analog Input Connections PCI-6023E/6024E/6025E User Manual 4-12 National Instruments Corporation Differential Connection Considerations (DIFF Input Configuration) PCI-6023E/6024E/6025E User Manual 4-14 National Instruments Corporation Differential Connections for Ground-Referenced Signal Sources Figure 4-5. Differential Input Connections for Ground-Referenced Signals National Instruments Corporation 4-15 PCI-6023E/6024E/6025E User Manual Differential Connections for Nonreferenced or Floating Signal Sources Figure 4-6. Differential Input Connections for Nonreferenced Signals 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 All Boards PCI-6025E Only Port C Pin Assignments Digital I/O Power-up State Changing DIO Power-up State to Pulled Low Timing Specifications Page Mode 1 Input Timing Mode 1 Output Timing Mode 2 Bidirectional Timing Power Connections Timing Connections Programmable Function Input Connections DAQ Timing Connections SCANCLK Signal EXTSTROBE* Signal TRIG1 Signal TRIG2 Signal STARTSCAN Signal Page CONVERT* Signal AIGATE Signal SISOURCE Signal Waveform Generation Timing Connections WFTRIG Signal UPDATE* Signal 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 GPCTR1_UP_DOWN Signal Page FREQ_OUT Signal Field Wiring Considerations Page Calibration Loading Calibration Constants Self-Calibration External Calibration Other Considerations A Specifications Analog Input Input Characteristics Accuracy Information Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Stability Analog Output Output Characteristics Accuracy Information Transfer Characteristics Voltage Output Dynamic Characteristics Stability Digital I/O DIO<0..7> PA<0..7>,PB<0..7>,PC<0..7> Timing I/O Triggers Digital Trigger Page B Custom Cabling and Optional Connectors Custom Cabling Optional Connectors Appendix B C ustom Cabling and Optional Connectors Figure B-1. 68-Pin E Series Connector Pin Assignments National Instruments Corporation B-3 PCI-6023E/6024E/6025E User Manual Appendix B Custom Cabling and Optional Connectors PCI-6023E/6024E/6025E User Manual B-4 National Instruments Corporation Figure B-2. 68-Pin Extended Digital Input Connector Pin Assignments Appendix B C ustom Cabling and Optional Connectors National Instruments Corporation B-5 PCI-6023E/6024E/6025E User Manual ACH8 ACH9 ACH10 ACH11 ACH12 Figure B-4. 50-Pin Extended Digital Input Connector Pin Assignments C Common Questions General Information Installation and Configuration Analog Input and Output Timing and Digital I/O Page Page D Customer Communication Electronic Services Bulletin Board Support FTP Support Fax-on-Demand Support Telephone and Fax Support Country Telephone Fax Technical Support Form PCI-6023E/6024E/6025E Hardware and Software Configuration Form National Instruments Products Other Products Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Technical Publications Glossary Numbers/Symbols A B C D E F G H I K L M N O P Page Q R S Page T U V W Index Numbers A B C D E F G H I L M N O P Q R S Page T U V W