National Instruments SCB-68 User Manual

4.7 (3)

DAQ

SCB-68 68-Pin Shielded

Connector Block User Manual

SCB-68 Shielded Connector Block User Manual

December 2002 Edition

Part Number 320745B-01

Worldwide Technical Support and Product Information

ni.com

National Instruments Corporate Headquarters

11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 683 0100

Worldwide Offices

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Slovenia 3 425 4200, South Africa 11 805 8197, Spain 91 640 0085, Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545

For further support information, refer to the Technical Support and Professional Services appendix. To comment on the documentation, send email to techpubs@ni.com.

© 1994–2002 National Instruments Corporation. All rights reserved.

Important Information

Warranty

The SCB-68 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and labor.

The media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due to defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period. National Instruments does not warrant that the operation of the software shall be uninterrupted or error free.

A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty.

National Instruments believes that the information in this document is accurate. The document has been carefully reviewed for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition. The reader should consult National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it.

EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF

NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR

DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY

THEREOF. This limitation of the liability of National Instruments will apply regardless of the form of action, whether in contract or tort, including negligence. Any action against National Instruments must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects, malfunctions, or service failures caused by owner’s failure to follow the National Instruments installation, operation, or maintenance instructions; owner’s modification of the product; owner’s abuse, misuse, or negligent acts; and power failure or surges, fire, flood, accident, actions of third parties, or other events outside reasonable control.

Copyright

Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written consent of National Instruments Corporation.

Trademarks

DAQCard, National Instruments, NI, and ni.comare trademarks of National Instruments Corporation.

Product and company names mentioned herein are trademarks or trade names of their respective companies.

Patents

For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.

WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS

(1)NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN.

(2)IN ANY APPLICATION, INCLUDING THE ABOVE, RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS, INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY, COMPUTER HARDWARE MALFUNCTIONS, COMPUTER OPERATING SYSTEM SOFTWARE FITNESS, FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION, INSTALLATION ERRORS, SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS, MALFUNCTIONS OR FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES, TRANSIENT FAILURES OF ELECTRONIC SYSTEMS (HARDWARE AND/OR SOFTWARE), UNANTICIPATED USES OR MISUSES, OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER (ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED “SYSTEM FAILURES”). ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS (INCLUDING THE RISK OF BODILY INJURY AND DEATH) SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE. TO AVOID DAMAGE, INJURY, OR DEATH, THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES, INCLUDING BUT NOT LIMITED TO BACK-UP OR SHUT DOWN MECHANISMS. BECAUSE EACH END-USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS' TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS, THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION, INCLUDING, WITHOUT LIMITATION, THE APPROPRIATE DESIGN, PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION.

Compliance

FFCC/Canada Radio Frequency Interference Compliance

Determining FCC Class

The Federal Communications Commission (FCC) has rules to protect wireless communications from interference. The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial-commercial locations only) or Class B (for use in residential or commercial locations). Depending on where it is operated, this product could be subject to restrictions in the FCC rules. (In Canada, the Department of Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.)

Digital electronics emit weak signals during normal operation that can affect radio, television, or other wireless products. By examining the product you purchased, you can determine the FCC Class and therefore which of the two FCC/DOC Warnings apply in the following sections. (Some products may not be labeled at all for FCC; if so, the reader should then assume these are Class A devices.)

FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and undesired operation. Most of our products are FCC Class A. The FCC rules have restrictions regarding the locations where FCC Class A products can be operated.

FCC Class B products display either a FCC ID code, starting with the letters EXN, or the FCC Class B compliance mark that appears as shown here on the right.

Consult the FCC Web site at http://www.fcc.gov for more information.

FCC/DOC Warnings

This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the instructions in this manual and the CE Marking Declaration of Conformity*, may cause interference to radio and television reception. Classification requirements are the same for the Federal Communications Commission (FCC) and the Canadian Department of Communications (DOC).

Changes or modifications not expressly approved by National Instruments could void the user’s authority to operate the equipment under the FCC Rules.

Class A

Federal Communications Commission

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct

the interference at his own expense.

Canadian Department of Communications

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

Class B

Federal Communications Commission

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

Canadian Department of Communications

This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

Compliance to EU Directives

Readers in the European Union (EU) must refer to the Manufacturer’s Declaration of Conformity (DoC) for information* pertaining to the CE Marking compliance scheme. The Manufacturer includes a DoC for most every hardware product except for those bought for OEMs, if also available from an original manufacturer that also markets in the EU, or where compliance is not required as for electrically benign apparatus or cables.

To obtain the DoC for this product, click Declaration of Conformity at ni.com/hardref.nsf/. This Web site lists the DoCs by product family. Select the appropriate product family, followed by your product, and a link to the DoC appears in Adobe Acrobat format. Click the Acrobat icon to download or read the DoC.

*The CE Marking Declaration of Conformity will contain important supplementary information and instructions for the user or installer.

Contents

About This Manual

Conventions ...................................................................................................................

xi

NI Documentation..........................................................................................................

xii

Chapter 1

Introduction

What You Need to Get Started ......................................................................................

1-1

Quick Reference Label ..................................................................................................

1-2

Installing Cables ............................................................................................................

1-5

Using 68-Pin Cables ........................................................................................

1-5

Using 100-Pin Cables ......................................................................................

1-6

Configuring the SCB-68 ................................................................................................

1-11

Safety Information .........................................................................................................

1-11

Chapter 2

Parts Locator and Wiring Guide

Switch Configuration .....................................................................................................

2-3

Chapter 3

Connecting Signals

Connecting Analog Input Signals ..................................................................................

3-1

Input Modes.....................................................................................................

3-1

Nonreferenced or Floating Signal Sources......................................................

3-3

Differential Inputs .............................................................................

3-3

Single-Ended Inputs ..........................................................................

3-3

Ground-Referenced Signal Sources ................................................................

3-4

Differential Inputs .............................................................................

3-4

Single-Ended Inputs ..........................................................................

3-4

Differential Connection Considerations (DIFF Input Mode)..........................

3-5

Differential Connections for Ground-Referenced Signal Sources....

3-6

Differential Connections for Nonreferenced

 

or Floating Signal Sources .............................................................

3-7

Using Bias Resistors ...........................................................

3-7

© National Instruments Corporation

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SCB-68 Shielded Connector Block User Manual

Contents

Single-Ended Connection Considerations ......................................................

3-8

Single-Ended Connections for Floating Signal Sources

 

(RSE Input Mode)..........................................................................

3-9

Single-Ended Connections for Grounded Signal Sources

 

(NRSE Input Mode).......................................................................

3-9

Connecting Analog Output Signals ...............................................................................

3-10

Connecting Digital Signals............................................................................................

3-11

Connecting Timing Signals ...........................................................................................

3-12

Noise Considerations.....................................................................................................

3-13

Chapter 4

Using Thermocouples

Switch Settings and Temperature Sensor Configuration...............................................

4-2

Special Considerations ..................................................................................................

4-3

Chapter 5

Adding Components for Special Functions

Channel Pad Configurations..........................................................................................

5-2

Conditioning Analog Input Channels .............................................................

5-2

Conditioning Analog Output Channels...........................................................

5-3

Conditioning PFI0/TRIG1 ..............................................................................

5-4

Accuracy and Resolution Considerations......................................................................

5-5

Open Thermocouple Detection......................................................................................

5-5

Differential Open Thermocouple Detection ...................................................

5-6

Single-Ended Open Thermocouple Detection ................................................

5-6

Sources of Error ..............................................................................................

5-6

Lowpass Filtering ..........................................................................................................

5-7

Theory of Operation........................................................................................

5-7

One-Pole Lowpass RC Filter ..........................................................................

5-10

Selecting Components.....................................................................................

5-11

Adding Components .......................................................................................

5-11

Single-Ended Lowpass Filter............................................................

5-12

Differential Lowpass Filter...............................................................

5-12

Analog Output and Digital Input Lowpass Filtering ........................

5-12

Lowpass Filtering Applications ......................................................................

5-13

Noise Filtering ..................................................................................

5-13

Antialiasing Filtering ........................................................................

5-13

Special Consideration for Analog Input Channels..........................................

5-14

Special Consideration for Analog Output Signals ..........................................

5-14

Special Consideration for Digital Trigger Input Signals ................................

5-15

Measuring a 4 to 20 mA Current ...................................................................................

5-16

Theory of Operation........................................................................................

5-16

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Contents

Selecting a Resistor .........................................................................................

5-17

Adding Components........................................................................................

5-18

Single-Ended Inputs ..........................................................................

5-18

Differential Inputs .............................................................................

5-18

Attenuating Voltage .......................................................................................................

5-18

Theory of Operation ........................................................................................

5-19

Selecting Components .....................................................................................

5-20

Accuracy Considerations ..................................................................

5-20

Adding Components........................................................................................

5-20

Single-Ended Input Attenuators........................................................

5-20

Differential Input Attenuators ...........................................................

5-21

Analog Output and Digital Input Attenuators...................................

5-22

Special Considerations for Analog Input ........................................................

5-22

Special Considerations for Analog Output......................................................

5-23

Special Considerations for Digital Inputs........................................................

5-24

Appendix A

Specifications

Appendix B

Quick Reference Labels

Appendix C

Fuse and Power

Appendix D

SCB-68 Circuit Diagrams

Appendix E

Soldering and Desoldering on the SCB-68

Appendix F

Technical Support and Professional Services

Glossary

Index

© National Instruments Corporation

ix

SCB-68 Shielded Connector Block User Manual

About This Manual

 

This manual describes the SCB-68 and explains how to use the connector

 

block with National Instruments data acquisition (DAQ) devices.

Conventions

 

 

 

 

The following conventions appear in this manual:

<>

Angle brackets that contain numbers separated by an ellipsis represent a

 

range of values associated with a bit or signal name—for example,

 

DIO<3..0>.

»

The » symbol leads you through nested menu items and dialog box options

 

to a final action. The sequence File»Page Setup»Options directs you to

 

pull down the File menu, select the Page Setup item, and select Options

 

from the last dialog box.

 

This icon denotes a note, which alerts you to important information.

 

This icon denotes a caution, which advises you of precautions to take to

 

avoid injury, data loss, or a system crash. When this symbol is marked on

 

the device, refer to the Safety Information of Chapter 1, Introduction, for

 

precautions to take.

bold

Bold text denotes items that you must select or click on in the software,

 

such as menu items and dialog box options. Bold text also denotes

 

parameter names.

italic

Italic text denotes variables, emphasis, a cross reference, or an introduction

 

to a key concept. This font also denotes text that is a placeholder for a word

 

or value that you must supply.

monospace

Text in this font denotes text or characters that you should enter from the

 

keyboard, sections of code, programming examples, and syntax examples.

 

This font is also used for the proper names of disk drives, paths, directories,

 

programs, subprograms, subroutines, device names, functions, operations,

 

variables, filenames and extensions, and code excerpts.

© National Instruments Corporation

xi

SCB-68 Shielded Connector Block User Manual

About This Manual

NI Documentation

For more information about using the SCB-68 with DAQ devices, refer to the following resources:

DAQ device user manuals, at ni.com/manuals

NI Developer Zone, at ni.com/zone

SCB-68 Shielded Connector Block User Manual

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ni.com

1

Introduction

The SCB-68 is a shielded I/O connector block with 68 screw terminals for easy signal connection to a National Instruments 68or 100-pin DAQ device. The SCB-68 features a general breadboard area for custom circuitry and sockets for interchanging electrical components. These sockets or component pads allow RC filtering, 4 to 20 mA current sensing, open thermocouple detection, and voltage attenuation. The open component pads allow signal conditioning to be easily added to the analog input (AI) signals and to the DAC0OUT, DAC1OUT, and PFI0/TRIG1 signals of a 68-pin or 100-pin DAQ device.

What You Need to Get Started

To set up and use the SCB-68, you need the following items:

SCB-68 68-pin shielded connector block

One of the devices listed in Table 1-1

One of the device-compatible cables listed in Table 1-1

The device user manual or user guide, which you can access at ni.com/manuals

Phillips number 1 and number 2 screwdrivers

0.125 in. flathead screwdriver

Long-nose pliers

Wire cutters

Wire insulation strippers

Quick reference label for the DAQ device you are using

© National Instruments Corporation

1-1

SCB-68 Shielded Connector Block User Manual

Chapter 1

Introduction

The following items, if you are adding components (optional):

Soldering iron and solder

Resistors

Capacitors

Quick Reference Label

A quick reference label for E Series devices is included in this kit. Quick reference labels for some other devices ship with the DAQ device itself. These labels show the switch configurations and define the screw terminal pinouts for compatible DAQ devices. You can put the label on the inside of the SCB-68 cover for easy reference if you are using one of these devices.

Refer to Appendix B, Quick Reference Labels, for the switch configurations and screw terminal pinouts that are included on each quick reference label.

Table 1-1 shows cabling options and features for DAQ devices that are compatible with the SCB-68. Figure 1-1 shows where to apply the quick reference label to the inside cover of the SCB-68.

Table 1-1. Device-Specific Hardware Configuration

Device

Cable Assembly

Features

 

 

 

 

 

 

 

E Series Devices

 

 

 

 

68-Pin Devices (except DAQCards)

SH68-68-EP,

Direct feedthrough only

 

SH68-68-R1-EP,

Thermocouple measurements

 

R6868

Open thermocouple detection

 

 

Current input

 

 

Filtering

 

 

Voltage dividers

 

 

AC coupling

 

 

 

100-Pin Devices

SH1006868

Direct feedthrough only

 

 

Thermocouple measurements

 

 

Open thermocouple detection

 

 

Current input

 

 

Filtering

 

 

Voltage dividers

 

 

AC coupling

 

 

 

SCB-68 Shielded Connector Block User Manual

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Chapter 1 Introduction

Table 1-1. Device-Specific Hardware Configuration (Continued)

Device

Cable Assembly

Features

 

 

 

 

 

 

NI 6024E for PCMCIA

SCH68-68-EP,

Direct feedthrough only

(DAQCard-6024E),

RC68-68

Thermocouple measurements

NI 6036E for PCMCIA

 

Open thermocouple detection

(DAQCard-6036E),

 

Current input

NI 6062E for PCMCIA

 

Filtering

(DAQCard-6062E)

 

Voltage dividers

 

 

AC coupling

 

 

 

NI 6012E for PCMCIA

PSHR68-68,

Direct feedthrough only

(DAQCard-AI-16XE-50),

PR68-68F

Thermocouple measurements

NI 6041E for PCMCIA

 

Open thermocouple detection

(DAQCard-AI-16E-4)

 

Current input

 

 

Filtering

 

 

Voltage dividers

 

 

AC coupling

 

 

 

 

Analog Output (AO) Devices

 

 

 

 

NI 670X

SH68-68-D1

Direct feedthrough only

for PCI/PXI/CompactPCI

R6868

RC filtering

 

 

 

NI 671X/673X

SH68-68-EP

Direct feedthrough only

for PCI/PXI/CompactPCI

SH68-68-R1-EP

RC filtering

 

R6868

 

 

 

 

NI 6715 for PCMCIA

SHC68-68-EP

Direct feedthrough only

(DAQCard-6715)

RC6868

RC filtering

 

 

 

 

Digital I/O (DIO) Devices

 

 

 

 

NI 6533

SH68-68-D1

Direct feedthrough only

for ISA/PCI/PXI/CompactPCI

R6868

 

 

 

 

NI 6533 for PCMCIA

PSHR68-68-D1,

Direct feedthrough only

(DAQCard-6533),

PR6868F

 

 

 

 

NI 6534

SH68-68-D1

Direct feedthrough only

for PCI/PXI/CompactPCI

R6868

 

 

 

 

 

Real-Time (RT) Devices

 

 

 

 

NI 7030/6030E

SH68-68-EP

Direct feedthrough only

for PCI/PXI/CompactPCI,

SH68-68R1-EP,

Thermocouple measurements

NI 7030/6040E

R6868

Open thermocouple detection

for PCI/PXI/CompactPCI

 

Current input

 

 

Filtering

 

 

Voltage dividers

 

 

AC coupling

 

 

 

NI 7030/6533

SH68-68-D1

Direct feedthrough only

for PCI/PXI/CompactPCI

R6868

 

 

 

 

© National Instruments Corporation

1-3

SCB-68 Shielded Connector Block User Manual

Chapter 1 Introduction

Table 1-1. Device-Specific Hardware Configuration (Continued)

Device

Cable Assembly

Features

 

 

 

 

 

 

 

S Series Devices

 

 

 

 

NI 6110/6111 for PCI

SH68-68-EP

Direct feedthrough only

 

SH68-68R1-EP,

 

 

R6868

 

 

 

 

NI 6115/6120

SH68-68-EP

Direct feedthrough only

for PCI/PXI/CompactPCI

SH68-68R1-EP,

 

 

R6868

 

 

 

 

 

Timing I/O (TIO) Devices

 

 

 

 

NI 6601/6602

SH68-68-D1,

Direct feedthrough only

for PCI/PXI/CompactPCI

R6868

 

 

 

 

 

Other Devices

 

 

 

 

NI 250X

SH68-68

Direct feedthrough only

for PXI/CompactPCI

 

 

 

 

 

NI 4350 for PCMCIA

SH68-68

Not recommended for use with the

(DAQCard-4350),

 

SCB-68

NI 4350 for USB

 

To maximize the available features,

 

 

 

 

NI recommends using this DAQ

 

 

device with the CB-68T, TBX-68,

 

 

or TBX-68T terminal blocks.

 

 

 

NI 4351

SH68-68

Not recommended for use with the

for PCI/PXI/CompactPCI

 

SCB-68

 

 

To maximize the available features,

 

 

NI recommends using this DAQ

 

 

device with the CB-68T, TBX-68,

 

 

or TBX-68T terminal blocks.

 

 

 

NI 445X for PCI

SHC50-68

Direct feedthrough only

 

 

 

NI 455X for PCI

SHC50-68

Direct feedthrough only

 

 

 

NI 5411

SHC50-68

Direct feedthrough only

for PCI/PXI/CompactPCI

 

 

 

 

 

NI 5431

SHC50-68

Direct feedthrough only

for PCI/PXI/CompactPCI

 

 

 

 

 

SCB-68 Shielded Connector Block User Manual

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Chapter 1

Introduction

 

1

 

 

2

 

 

 

3

9

10

 

 

5

4

 

 

 

6

 

 

8

 

 

7

 

1

Quick Reference Label

4

Lock Washers

8

Strain-Relief Bars

2

Cover

5

Shielding Screws

9

Strain-Relief Screws

3

68-Pin Connector

6

68-Pin I/O Connector

10

Circuit Card Assembly

 

Screws

7

Base

 

 

 

 

 

 

 

 

Figure 1-1. SCB-68 Parts Locator Diagram

Installing Cables

The following sections describe how to cable one or more SCB-68 connector blocks to a DAQ device using 68-pin or 100-pin cables.

Note For the I/O connector pinout of the DAQ device, refer to the device user manual at ni.com/manuals or to the quick reference label provided with the DAQ device.

Using 68-Pin Cables

Table 1-1 lists the 68-pin cable assemblies that can connect the SCB-68 to a 68-pin DAQ device. Each end of these 68-pin cables has a 68-pin I/O connector that you can connect to the SCB-68 and to the 68-pin DAQ device. In this configuration, the I/O connector pinout on the DAQ device determines the I/O connector pinout on the SCB-68.

© National Instruments Corporation

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SCB-68 Shielded Connector Block User Manual

Chapter 1

Introduction

Figure 1-2 shows how to use a 68-pin cable to connect the SCB-68 to a 68-pin DAQ device.

 

 

1

 

5

4

3

2

1

68-Pin Cable Assembly

4

68-Pin I/O Connector

2

68-Pin DAQ Device

5

SCB-68 Connector Block

3

68-Pin I/O Connector

 

 

 

 

 

 

Figure 1-2. Connecting a 68-Pin DAQ Device to an SCB-68

Using 100-Pin Cables

You can use the SH1006868 cable assembly to connect two SCB-68 connector blocks to a 100-pin DAQ device. The SH1006868 is Y-shaped, with a 100-pin male connector on one end and two 68-pin female connectors on the opposite end. The DAQ device connects to the 100-pin cable connector, and an SCB-68 can connect to each 68-pin cable connector. Figure 1-3 shows how use the SH1006868 to cable a 100-pin DAQ device to two SCB-68 devices.

SCB-68 Shielded Connector Block User Manual

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ni.com

 

 

Chapter 1

Introduction

 

3

 

 

1

2

 

 

 

5

4

 

1

SCB-68 Connector Blocks

4

100-Pin DAQ Device

2

68-Pin I/O Connectors

5

100-Pin I/O Connector

3

SH1006868 Cable Assembly

 

 

 

 

 

 

Figure 1-3. Connecting a 100-Pin DAQ Device to Two SCB-68 Connector Blocks

When you attach two SCB-68 devices to the SH1006868 cable, one of the SCB-68 connector blocks has a full 68-pin I/O connector pinout, and the other SCB-68 connector block has an extended AI or extended digital pinout. Each 68-pin end of the SH1006868 cable has a label that indicates which I/O connector pinout is associated with that 68-pin I/O connector.

Figure 1-4 shows the pin assignments for the I/O connector on a 68-pin E Series device. This connector is available when you use the SH68-68-EP or R6868 cable assemblies with an E Series DAQ device. It is also one of two 68-pin connectors available when you use the SH1006868 cable assembly with a 100-pin E Series DAQ device.

© National Instruments Corporation

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SCB-68 Shielded Connector Block User Manual

Chapter 1

Introduction

ACH8

34

68

ACH0

ACH1

33

67

AIGND

AIGND

32

66

ACH9

ACH10

31

65

ACH2

ACH3

30

64

AIGND

AIGND

29

63

ACH11

ACH4

 

 

 

28

62

AISENSE

AIGND

 

 

 

27

61

ACH12

ACH13

26

60

ACH5

ACH6

25

59

AIGND

AIGND

24

58

ACH14

ACH15

 

 

 

23

57

ACH7

 

 

 

 

DAC0OUT1

22

56

AIGND

DAC1OUT1

21

55

AOGND2

EXTREF3

20

54

AOGND2

DIO4

19

53

DGND

DGND

18

52

DIO0

DIO1

17

51

DIO5

DIO6

16

50

DGND

DGND

15

49

DIO2

 

 

 

 

+5V

14

48

DIO7

DGND

13

47

DIO3

DGND

12

46

SCANCLK

PFI0/TRIG1

11

45

EXTSTROBE*

PFI1/TRIG2

10

44

DGND

DGND

9

43

PFI2/CONVERT*

+5V

8

42

PFI3/GPCTR1_SOURCE

DGND

7

41

PFI4/GPCTR1_GATE

PFI5/UPDATE*

6

40

GPCTR1_OUT

PFI6/WFTRIG

5

39

DGND

DGND

4

38

PFI7/STARTSCAN

PFI9/GPCTR0_GATE

3

37

PFI8/GPCTR0_SOURCE

GPCTR0_OUT

2

36

DGND

FREQ_OUT

1

35

DGND

1No connect on the DAQCard-AI-16E-4, DAQCard-AI-16XE-50, NI PCI-6023E, NI PCI-6032E, NI PCI-6033E, and NI PCI-6034E

2No connect on the DAQCard-AI-16E-4 and DAQCard-AI-16XE-50

3No connect on the DAQCard-AI-16E-4, DAQCard-AI-16XE-50, DAQCard-6024E, NI PCI-6023E, NI PCI-6024E, NI PXI-6030E, NI PXI-6031E, NI PCI-6032E, NI PCI-6033E, NI PCI-6034E,

NI PCI-6035E, NI PCI-6036E, PCI-MIO-16XE-10, and PCI-MIO-16XE-50

Figure 1-4. SCB-68 E Series I/O Connector Pinout (Full)

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Chapter 1

Introduction

Figure 1-5 shows the pin assignments for the extended AI connector. This pinout shows the other 68-pin connector when you use the SH1006868 cable assembly with an NI 6031E, NI 6033E, or NI 6071E.

ACH24

34

68

ACH16

ACH17

33

67

ACH25

ACH18

32

66

ACH26

ACH27

31

65

ACH19

ACH20

30

64

ACH28

ACH21

29

63

ACH29

ACH30

 

 

 

28

62

ACH22

 

 

 

 

ACH23

27

61

ACH31

ACH32

26

60

ACH40

ACH41

25

59

ACH33

ACH34

24

58

ACH42

ACH35

 

 

 

23

57

ACH43

 

 

 

 

AIGND

22

56

AISENSE2

ACH44

21

55

ACH36

ACH37

20

54

ACH45

ACH38

19

53

ACH46

ACH47

18

52

ACH39

ACH48

17

51

ACH56

ACH49

16

50

ACH57

ACH58

15

49

ACH50

 

 

 

 

ACH51

14

48

ACH59

ACH52

13

47

ACH60

ACH61

12

46

ACH53

ACH54

11

45

ACH62

ACH55

10

44

ACH63

NC

9

43

NC

NC

8

42

NC

NC

7

41

NC

NC

6

40

NC

NC

5

39

NC

NC

4

38

NC

NC

3

37

NC

NC

2

36

NC

NC

1

35

NC

NC = No Connect

Figure 1-5. SCB-68 E Series I/O Connector Pinout (Extended AI)

© National Instruments Corporation

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SCB-68 Shielded Connector Block User Manual

Chapter 1

Introduction

Figure 1-6 shows the pin assignments for the extended digital connector. This pinout shows the other 68-pin connector when you use the SH1006868 cable assembly with an NI 6025E or the NI 6021E (AT-MIO-16DE-10) for ISA.

GND

34

68

PC7

PC6

33

67

GND

PC5

32

66

GND

GND

31

65

PC4

PC3

30

64

GND

PC2

29

63

GND

GND

 

 

 

28

62

PC1

 

 

 

 

PC0

27

61

GND

PB7

26

60

GND

GND

25

59

PB6

PB5

24

58

GND

PB4

 

 

 

23

57

GND

 

 

 

 

GND

22

56

PB3

GND

21

55

PB2

PB1

20

54

GND

PB0

19

53

GND

GND

18

52

PA7

PA6

17

51

GND

PA5

16

50

GND

GND

15

49

PA4

 

 

 

 

PA3

14

48

GND

PA2

13

47

GND

GND

12

46

PA1

PA0

11

45

GND

+5V

10

44

GND

NC

9

43

NC

NC

8

42

NC

NC

7

41

NC

NC

6

40

NC

NC

5

39

NC

NC

4

38

NC

NC

3

37

NC

NC

2

36

NC

NC

1

35

NC

NC = No Connect

Figure 1-6. SCB-68 E Series I/O Connector Pinout (Extended Digital)

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Chapter 1

Introduction

Configuring the SCB-68

For instructions about using Measurement & Automation Explorer (MAX) to configure the SCB-68 as an accessory for a DAQ device, complete the following steps:

1.Navigate to MAX by selecting Start»Programs»National Instruments»Measurement&Automation.

2.Select Help»Help Topics»NI-DAQ in MAX.

3.Select DAQ Devices»Configuring DAQ Devices»Configuring DAQ Devices»Accessory in the Measurement & Automation Explorer Help for MAX.

Safety Information

The following section contains important safety information that you must follow when installing and using the SCB-68.

Do not operate the SCB-68 in a manner not specified in this document. Misuse of the SCB-68 can result in a hazard. You can compromise the safety protection built into the SCB-68 if the device is damaged in any way. If the SCB-68 is damaged, return it to NI for repair.

Do not substitute parts or modify the SCB-68 except as described in this document. Use the SCB-68 only with the chassis, modules, accessories, and cables specified in the installation instructions. You must have all covers and filler panels installed during operation of the SCB-68.

Do not operate the SCB-68 in an explosive atmosphere or where there may be flammable gases or fumes. Operate the SCB-68 only at or below the pollution degree stated in Appendix A, Specifications.

Pollution is foreign matter in a solid, liquid, or gaseous state that can reduce dielectric strength or surface resistivity. The following is a description of pollution degrees:

Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The pollution has no influence.

Pollution Degree 2 means that only nonconductive pollution occurs in most cases. Occasionally, however, a temporary conductivity caused by condensation must be expected.

© National Instruments Corporation

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SCB-68 Shielded Connector Block User Manual

Chapter 1

Introduction

Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive pollution occurs that becomes conductive due to condensation.

Clean the SCB-68 with a soft nonmetallic brush. Make sure that the SCB-68 is completely dry and free from contaminants before returning it to service.

You must insulate signal connections for the maximum voltage for which the SCB-68 is rated. Do not exceed the maximum ratings for the SCB-68. Remove power from signal lines before connecting them to or disconnecting them from the SCB-68.

Operate the SCB-68 only at or below the installation category stated in

Appendix A, Specifications.

The following is a description of installation categories:

Installation Category I is for measurements performed on circuits not directly connected to MAINS1. This category is a signal level such as voltages on a printed wire board (PWB) on the secondary of an isolation transformer.

Examples of Installation Category I are measurements on circuits not derived from MAINS and specially protected (internal) MAINS-derived circuits.

Installation Category II is for measurements performed on circuits directly connected to the low-voltage installation. This category refers to local-level distribution such as that provided by a standard wall outlet.

Examples of Installation Category II are measurements on household appliances, portable tools, and similar equipment.

Installation Category III is for measurements performed in the building installation. This category is a distribution level referring to hardwired equipment that does not rely on standard building insulation.

Examples of Installation Category III include measurements on distribution circuits and circuit breakers. Other examples of Installation Category III are wiring including cables, bus-bars, junction boxes, switches, socket outlets in the building/fixed

1MAINS is defined as the electricity supply system to which the equipment concerned is designed to be connected either for powering the equipment or for measurement purposes.

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Chapter 1

Introduction

installation, and equipment for industrial use, such as stationary motors with a permanent connection to the building/fixed installation.

Installation Category IV is for measurements performed at the source of the low-voltage (<1,000 V) installation.

Examples of Installation Category IV are electric meters, and measurements on primary overcurrent protection devices and ripple-control units.

Below is a diagram of a sample installation.

© National Instruments Corporation

1-13

SCB-68 Shielded Connector Block User Manual

2

Parts Locator and Wiring Guide

This chapter explains how to connect signals to the SCB-68.

The following cautions contain important safety information concerning hazardous voltages and terminal blocks.

Cautions Keep away from live circuits. Do not remove equipment covers or shields unless you are trained to do so. If signal wires are connected to the SCB-68, dangerous voltages may exist even when the equipment is powered off. To avoid dangerous electrical shock, do not perform procedures involving cover or shield removal unless you are qualified to do so. Before you remove the cover, disconnect the AC power or any live circuits from the SCB-68.

The chassis GND terminals are for grounding high-impedance sources such as floating sources (1 mA maximum). Do not use these terminals as safety earth grounds.

Do not connect high voltages to the SCB-68 even with an attenuator circuit. Never connect voltages ≥42 Vrms. NI is not liable for any damage or injuries resulting from improper use or connection.

© National Instruments Corporation

2-1

SCB-68 Shielded Connector Block User Manual

National Instruments SCB-68 User Manual

Chapter 2 Parts Locator and Wiring Guide

1

2

3

4

C6

R20

 

R21

 

C4

 

R22(A)

S5 S4 S3

33 34

 

 

R4(F)

 

 

 

 

 

 

RC12(B)

RC4(E)

 

 

 

R23(C)

 

 

 

 

 

 

 

RC13(D)

 

R5(G)

 

 

 

 

 

 

R24(A)

 

R6(F)

 

 

 

 

 

 

RC14(B)

RC5(E)

 

 

 

R25(C)

 

 

 

 

 

 

 

RC15(D)

 

R7(G)

 

 

 

 

 

 

R26(A)

 

R8(F)

 

 

 

 

 

 

RC16(B)

RC6(E)

 

 

 

R27(C)

 

 

 

 

 

 

 

RC17(D)

 

R9(G)

 

 

 

 

 

 

R28(A)

 

R10(F)

 

 

 

 

 

 

RC18(B)

RC7(E)

 

 

 

R29(C)

 

 

 

C5

 

 

 

RC19(D)

R11(G)

 

13

 

C3

 

R38

 

 

 

 

 

 

 

R30(A)

 

R12(F)

 

 

 

 

 

 

RC20(B)

RC8(E)

 

 

 

R31(C)

 

 

 

 

 

 

 

RC21(D)

 

R13(G)

 

 

 

 

 

 

R32(A)

 

R14(F)

 

 

 

 

 

 

RC22(B)

RC9(E)

 

 

 

R33(C)

 

 

 

 

 

 

 

RC23(D)

 

R15(G)

 

 

 

 

 

 

R34(A)

 

R16(F)

 

 

 

 

 

 

RC24(B)

RC10(E)

 

 

 

R35(C)

 

 

 

 

 

 

 

RC25(D)

 

R17(G)

 

 

 

 

 

 

R36(A)

 

R18(F)

 

 

 

 

 

 

RC26(B)

RC11(E)

 

 

 

R37(C)

 

 

 

 

 

 

 

RC27(D)

 

R19(G)

 

 

 

 

 

SCB-68

©COPYRIGHT 1993

J1

68

34

67

33

66

32

65

31

64

30

63

29

62

28

61

27

60

26

59

25

58

24

57

23

1 3

12

46

13

47

14

48

15

49

16

50

17

51

18

52

19

53

20

54

21

55

22

56

XF1

 

C2

C1

S1

 

S2

 

 

 

1

 

 

 

35

 

 

 

2

 

 

 

36

 

 

 

3

 

 

 

37

 

 

 

4

 

 

 

38

 

 

 

5

 

 

 

39

 

 

 

6

 

 

 

40

 

 

 

7

 

 

 

41

 

 

 

8

 

 

 

42

RC2

 

 

9

 

 

43

R2

RC1

R10

10

 

 

 

RC3

 

 

44

R3

 

 

 

 

11

 

 

 

 

 

 

45

B.REV 01-ASSY182470

S/N

5

6

7

8

 

12

11

10

9

 

 

 

 

 

 

 

 

 

 

1

Pads R20 and R21

 

8

Serial Number

2

Switches S3, S4, and S5

 

9

RC Filters and Attenuators for DAC0,

3

68-Pin I/O Connector

 

 

DAC1, and TRIG1

4

Fuse (0.8 A)

 

10

Breadboard Area

5

Switches S1 and S2

 

11

Temperature Sensor

6

Assembly Number and Revision Letter

 

12

Product Name

7

Screw Terminals

 

13

Pads for AI Conditioning

 

 

 

 

 

Figure 2-1. SCB-68 Printed Circuit Diagram

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Chapter 2 Parts Locator and Wiring Guide

To connect signals to the SCB-68, complete the following steps while referring to Figure 1-1, SCB-68 Parts Locator Diagram, and to Figure 2-1.

1.Disconnect the 68-pin cable from the SCB-68, if it is connected.

2.Remove the shielding screws on either side of the top cover with a Phillips-head number 1 screwdriver. You can now open the box.

3.Configure the switches and other options relative to the types of signals you are using.

4.Loosen the strain-relief screws with a Phillips-head number 2 screwdriver. Slide the signal wires through the front panel strain-relief opening. You can also remove the top strain-relief bar if you are connecting many signals. Add insulation or padding if necessary.

5.Connect the wires to the screw terminals by stripping off 0.25 in. of the insulation, inserting the wires into the green terminals, and tightening the screws.

6.Reinstall the strain-relief bar (if you removed it) and tighten the strain-relief screws.

7.Close the top cover.

8.Reinsert the shielding screws to ensure proper shielding.

You can now connect the SCB-68 to the 68-pin I/O connector.

Switch Configuration

The SCB-68 has five switches that must be properly configured to use the SCB-68 with the DAQ device. Table 2-1 illustrates the available switch configurations and the affected signals for each switch setting. Refer to Table 2-1 to determine the switch setting that applies to your application, and then refer to the following sections for more information on specific types of signals.

© National Instruments Corporation

2-3

SCB-68 Shielded Connector Block User Manual

Chapter 2 Parts Locator and Wiring Guide

Table 2-1. Switch Configurations and Affected Signals

Switch Setting

Applicable Signals

Analog input, analog output,

digital I/O, and timing I/O

Temperature Sensor

S5 S4 S3

Signal Conditioning

Circuitry Power (Off)

S1

S2

Direct feedthrough, with temperature sensor disabled and accessory power disabled

Analog input

and analog output1

Temperature Sensor

S5 S4 S3

Signal Conditioning

Circuitry Power (On)

S1

S2

Temperature sensor disabled, and accessory power enabled2

Note: This configuration is the factory-default configuration.

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Chapter 2 Parts Locator and Wiring Guide

Table 2-1. Switch Configurations and Affected Signals (Continued)

Switch Setting

Applicable Signals

Single-ended analog input3

Temperature Sensor

S5 S4 S3

Signal Conditioning

Circuitry Power (On)

S1

S2

Single-ended temperature sensor, with accessory power enabled2

Differential analog input

Temperature Sensor

S5 S4 S3

Signal Conditioning

Circuitry Power (On)

S1

S2

Differential temperature sensor, with accessory power enabled2

1When accessory power is enabled, I/O pin 8 is fused and is intended to be connected to +5V. This setting is not recommended for use with the NI 653X, NI 670X, or NI 660X. Refer to the device user manual at ni.com/manuals to determine if the device supplies +5 V to I/O pin 8.

2Only applies to the signal conditioning circuitry.

3Except NI 61XX devices. Refer to the device user manual at ni.com/manuals to determine if the device supports single-ended inputs.

© National Instruments Corporation

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SCB-68 Shielded Connector Block User Manual

3

Connecting Signals

This chapter describes the types of signal sources that you use when configuring the channels and making signal connections to the SCB-68, describes input modes, and discusses noise considerations to help you acquire accurate signals.

Connecting Analog Input Signals

The following sections describe how to connect signal sources for single-ended or differential (DIFF) input mode. On most devices, you can software-configure the DAQ device channels for two types of single-ended connections—nonreferenced single-ended (NRSE) input mode and referenced single-ended (RSE) mode. RSE input mode is used for floating signal sources. In this case, the DAQ device provides the reference ground point for the external signal. NRSE input mode is used for ground-referenced signal sources. In this case, the external signal supplies its own reference ground point, and the DAQ device should not supply one.

Note Some devices might only support one of the possible input modes.

Input Modes

You can configure the DAQ device for one of three input modes—NRSE, RSE, or DIFF. The following sections discuss the use of single-ended and differential measurements and considerations for measuring both floating and ground-referenced signal sources. On devices that support both single-ended and DIFF input modes, using DIFF input mode commits two channels, ACH<i> and ACH<i+8>, to each signal. Figure 3-1 summarizes the recommended input modes for both types of signal sources.

© National Instruments Corporation

3-1

SCB-68 Shielded Connector Block User Manual

Chapter 3 Connecting Signals

 

 

Signal Source Type

 

 

 

 

 

 

Floating Signal Source

Grounded Signal Source

 

(Not Connected to Building Ground)

 

 

 

 

 

Examples:

Examples:

 

• Ungrounded thermocouples

• Plug-in instruments with

Input

Signal conditioning with

nonisolated outputs

 

Isolated outputs

 

 

 

 

 

Battery devices

 

 

 

 

 

ACH(+)

+

 

 

 

 

ACH(+)

+

 

+

 

V1

 

+

 

V1

 

 

 

 

 

ACH(–)

 

 

 

ACH(–)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Differential

 

 

 

R

 

 

 

 

 

 

 

 

(DIFF)

Common-

 

 

 

Common-

 

 

 

 

 

 

+

 

 

 

+

 

 

 

 

 

 

Mode

 

AIGND

 

Mode

 

 

 

 

AIGND

 

Voltage

 

 

 

Voltage

 

 

 

 

 

 

Refer to the Using Bias Resistors

 

 

 

 

 

 

 

 

section for information on bias resistors.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOT RECOMMENDED

 

 

 

 

 

 

 

 

 

 

ACH

 

+

 

 

 

 

ACH

 

+

V1

 

 

 

 

 

 

 

+

 

 

 

 

 

+

 

V1

 

 

 

 

 

 

 

 

AIGND

 

 

 

 

+

Vg

Single-Ended —

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ground

 

 

 

 

 

Common-

+

 

 

 

 

 

Referenced

 

 

 

 

 

Mode

 

 

 

 

AIGND

(RSE)

CommonMode - +

 

 

 

Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage

 

 

 

Ground-loop losses, Vg, are added to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

measured signal.

 

 

 

 

ACH

+

 

 

 

 

ACH

 

+

 

+

 

V1

 

+

 

V1

 

 

 

 

 

AISENSE

 

 

AISENSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Single-Ended —

 

 

 

 

 

 

 

 

 

 

 

 

Nonreferenced

Common-

+

 

R

 

Common-

+

 

 

 

 

 

(NRSE)

Mode

 

AIGND

Mode

 

 

 

 

AIGND

 

Voltage

 

 

 

Voltage

 

 

 

 

 

Refer to the Using Bias Resistors section for information on bias resistors.

Figure 3-1. Summary of AI Connections

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