National Instruments SC-2043-SG Bedienungsanleitung

SC-2043-SG

User Manual

Eight-Channel Strain Gauge Signal Conditioning Accessory

August 1996 Edition

Part Number 371201A-01

National Instruments Corporate Headquarters

6504 Bridge Point Parkway

Austin, TX 78730-5039

(512) 794-0100

Technical support fax: (800) 328-2203

(512) 794-5678

Branch Offices:

Australia 03 9 879 9422, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Canada (Ontario) 519 622 9310,

Canada (Québec) 514 694 8521, Denmark 45 76 26 00, Finland 90 527 2321, France 1 48 14 24 24,

Germany 089 741 31 30, Hong Kong 2645 3186, Italy 02 48301892, Japan 03 5472 2970, Korea 02 596 7456,

Mexico 95 800 010 0793, Netherlands 0348 433466, Norway 32 84 84 00, Singapore 2265886, Spain 91 640 0085,

Sweden 08 730 49 70, Switzerland 056 20 51 51, Taiwan 02 377 1200, U.K. 01635 523545

Limited Warranty

The SC-2043-SG 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.

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 manual 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. CUSTOMER'S 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.

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

LabVIEW®, NI-DAQ®, RTSI®, DAQCard™, and DAQPad™ are trademarks of National Instruments Corporation.

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

WARNING REGARDING MEDICAL AND CLINICAL USE

OF NATIONAL INSTRUMENTS PRODUCTS

National Instruments products are not designed with components and testing intended to ensure a level of reliability

suitable for use in treatment and diagnosis of humans. Applications of National Instruments products involving

medical or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on the

part of the user or application designer. Any use or application of National Instruments products for or involving

medical or clinical treatment must be performed by properly trained and qualified medical personnel, and all

traditional medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent

serious injury or death should always continue to be used when National Instruments products are being used.

National Instruments products are NOT intended to be a substitute for any form of established process, procedure, or

equipment used to monitor or safeguard human health and safety in medical or clinical treatment.

Contents

About This Manual ...............................................................................................................ix

Organization of This Manual ............................................................................................ix

Conventions Used in This Manual....................................................................................x

National Instruments Documentation ...............................................................................x

Related Documentation ....................................................................................................xi

Customer Communication ................................................................................................xi

Chapter 1

Introduction ..........................................................................................................................1-1

About the SC-2043-SG ..................................................................................................1-1

What You Need to Get Started ......................................................................................1-1

Software Programming Choices ....................................................................................1-2

LabVIEW and LabWindows/CVI Application Software ..................................1-2

NI-DAQ Driver Software...................................................................................1-2

Optional Equipment .......................................................................................................1-3

Unpacking ......................................................................................................................1-4

Chapter 2

Installation and Configuration.......................................................................................2-1

Installation......................................................................................................................2-1

Board Configuration ......................................................................................................2-1

Power Supply Selection .....................................................................................2-3

Onboard/External Excitation Selection..............................................................2-4

Local Excitation Sense Selection.......................................................................2-5

MIO or MIO E Series Boards ................................................................2-5

Lab/1200 Series Boards .........................................................................2-6

Bridge Completion Selection.............................................................................2-7

Chapter 3

Signal Connections .............................................................................................................3-1

I/O Connector Pin Description.......................................................................................3-1

Screw Terminal Description ..........................................................................................3-6

Analog Input Connections .................................................................................3-7

Sensor Connection to the SC-2043-SG..................................................3-7

Full-Bridge Connection..............................................................3-8

Half-Bridge Connection.............................................................3-8

Quarter-Bridge Connection........................................................3-9

Offset Nulling ................................................................................................................3-9

Offset Nulling Adjustment.................................................................................3-9

Nulling Range Adjustment.................................................................................3-10

Other Connection Considerations ..................................................................................3-11

Contents

SC-2043-SG User Manual vi © National Instruments Corporation

Chapter 4

Theory of Operation ..........................................................................................................4-1

Functional Overview......................................................................................................4-1

Bridge Completion Network..........................................................................................4-3

Amplification .................................................................................................................4-3

Offset Nulling ................................................................................................................4-3

Filtering..........................................................................................................................4-4

I/O Connectors and Breakout Screw Terminals ............................................................4-4

Excitation Voltage Source .............................................................................................4-4

Power Supply .................................................................................................................4-4

Chapter 5

Calibration Procedures.....................................................................................................5-1

Excitation Adjustment....................................................................................................5-1

Onboard Excitation Source ................................................................................5-1

External Excitation Source.................................................................................5-2

Appendix A

Specifications........................................................................................................................A-1

Appendix B

Customer Communication...............................................................................................B-1

Glossary..................................................................................................................................G-1

Index ........................................................................................................................................I-1

Contents

Figures

Figure 1-1. The Relationship between the Programming Environment,

NI-DAQ, and Your Hardware .............................................................................1-3

Figure 2-1. SC-2043-SG Parts Locator Diagram ...................................................................2-2

Figure 3-1. Full-Bridge Connection to the SC-2043-SG........................................................3-8

Figure 3-2. Half-Bridge Connection to the SC-2043-SG.......................................................3-8

Figure 3-3. Quarter-Bridge Connection to the SC-2043-SG..................................................3-9

Figure 4-1. SC-2043-SG Block Diagram ...............................................................................4-2

Tables

Table 2-1. Installation and Cabling Options for the SC-2043-SG........................................2-1

Table 2-2. Power Supply Selection.......................................................................................2-3

Table 2-3. Onboard/External Excitation Jumpers.................................................................2-4

Table 2-4. Local Excitation Sense Jumper Settings for MIO and MIO E Series Boards .....2-5

Table 2-5. Local Excitation Sense Jumper Settings for Lab/1200 Series Boards.................2-6

Table 2-6. Half-Bridge Completion Jumper Settings ...........................................................2-7

Table 2-7. Half-Bridge Completion Jumpers and Corresponding Channels ........................2-7

Table 2-8. Quarter-Bridge Completion Resistors and Corresponding Channels..................2-8

Table 3-1. Pin Assignments for the MIO I/O Connectors ....................................................3-2

Table 3-2. Pin Assignments for the Lab/1200 I/O Connector ..............................................3-4

Table 3-3. MIO (J10) I/O Connectors Signal Summary.......................................................3-5

Table 3-4. Lab/1200 (J9) Signal Summary...........................................................................3-6

Table 3-5. Screw Terminals J1–J6 Signal Summary ............................................................3-7

Table 3-6. Offset Nulling Adjust Potentiometer and Corresponding Channel .....................3-9

Table 3-7. Nulling Resistor and Corresponding Channel .....................................................3-10

About This Manual

This manual describes the electrical and mechanical aspects of the SC-2043-SG and contains

information concerning its configuration and operation. The SC-2043-SG is an eight-channel

strain gauge signal conditioning accessory for National Instruments DAQ boards. The

conditioned strain gauge signals are routed directly to the analog input channels of the DAQ

board via a 50-pin connector. The SC-2043-SG also has breakout screw terminals for additional

analog inputs (MIO and MIO E Series boards only), analog outputs, and digital and timing I/O

pins on the DAQ board I/O connector.

Organization of This Manual

The SC-2043-SG User Manual is organized as follows:

• Chapter 1, Introduction, describes the SC-2043-SG, lists what you need to get started with

your SC-2043-SG, describes the optional software and optional equipment, and explains how

to unpack your SC-2043-SG.

• Chapter 2, Installation and Configuration, describes the installation and configuration of

your SC-2043-SG. The topics discussed are connection of the SC-2043-SG to the DAQ

board and switch and jumper configuration for your SC-2043-SG.

• Chapter 3, Signal Connections,describes the signal connections to the SC-2043-SG board.

• Chapter 4, Theory of Operation, contains a functional overview of the SC-2043-SG board

and explains the operation of each functional unit making up the SC-2043-SG.

• Chapter 5, Calibration Procedures, discusses the calibration procedures for the SC-2043-SG.

• Appendix A, Specifications, lists the specifications for the SC-2043-SG.

• Appendix B, Customer Communication, contains forms you can use to request help from

National Instruments or to comment on our products.

• The Glossary contains an alphabetical list and description of terms used in this manual,

including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.

• The Index contains an alphabetical list of key terms and topics used in this manual, including

the page where you can find each one.

About This Manual

SC-2043-SG User Manual x © National Instruments Corporation

Conventions Used in This Manual

The following conventions are used in this manual:

bold italic Bold, italic text denotes a note, caution, or warning.

italic Italic text denotes emphasis, a cross reference, or an introduction to a key

concept.

Lab/1200 Lab/1200 refers to the National Instruments Lab-PC+, DAQPad-1200, and

DAQCard-1200 products unless otherwise noted.

MIO MIO refers to the National Instruments AT-MIO-16/64 and

NB-MIO-16/64 (except the -16H and -DH) DAQ boards unless otherwise

noted.

MIO E MIO E refers to the National Instruments MIO E Series of DAQ boards

unless otherwise noted.

monospace Text in this font denotes text or characters that are to be literally input

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, variables, filenames, and extensions, and for statements and

comments taken from program code.

Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the

Glossary.

National Instruments Documentation

The SC-2043-SG User Manual is one piece of the documentation set for your system. You could

have any of several types of manuals, depending on the hardware and software in your system.

Use the manuals you have as follows:

• Your DAQ hardware user manuals–These manuals have detailed information about the DAQ

hardware that plugs into or is connected to your computer. Use these manuals for hardware

installation and configuration instructions, specification information about your DAQ

hardware, and application hints.

• Software manuals–Examples of software manuals you might have are the LabVIEW and

LabWindows®/CVI manual sets and the NI-DAQ manuals. After you set up your hardware

system, use either the application software (LabVIEW or LabWindows/CVI) manuals or the

NI-DAQ manuals to help you write your application. If you have a large and complicated

system, it is worthwhile to look through the software manuals before you configure your

hardware.

About This Manual

• Accessory manuals–If you are using accessory products, read the terminal block and cable

assembly installation guides or accessory board user manuals. They explain how to

physically connect the relevant pieces of the system together. Consult these guides when you

are making your connections.

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