National Instruments Barcode Reader SC 2043 SG User Manual
SC-2043-SG  
User Manual  
Eight-Channel Strain Gauge Signal Conditioning Accessory  
August 1996 Edition  
Part Number 320995B-01  
© Copyright 1995, 1996 National Instruments Corporation.  
All Rights Reserved.  
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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.  
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  
®
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.  
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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.  
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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  
Register-Level Programming.............................................................................1-3  
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  
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Contents  
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  
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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  
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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.  
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About This Manual  
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  
MIO  
Lab/1200 refers to the National Instruments Lab-PC+, DAQPad-1200, and  
DAQCard-1200 products unless otherwise noted.  
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.  
SC-2043-SG User Manual  
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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.  
Related Documentation  
The following document contains information that you may find helpful as you read this manual:  
•
Your DAQ hardware user manual  
Customer Communication  
National Instruments wants to receive your comments on our products and manuals. We are  
interested in the applications you develop with our products, and we want to help if you have  
problems with them. To make it easy for you to contact us, this manual contains comment and  
configuration forms for you to complete. These forms are in Appendix B, Customer  
Communication, at the end of this manual.  
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Chapter 1  
Introduction  
This chapter 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.  
About the SC-2043-SG  
The SC-2043-SG is an eight-channel signal conditioning board that interfaces strain gauge  
signals to National Instruments DAQ boards. Each channel includes half-bridge completion with  
jumper disable for full-bridge connections, sockets for quarter-bridge completion resistors,  
amplifier gain of 10, buffered single pole 1.6 kHz filter, offset nulling circuit, and screw terminal  
connections to accommodate strain gauge bridge measurements. Output voltage excitation leads  
and input signal leads are attached at the screw terminals. An onboard excitation voltage source  
is provided, along with screw terminal connections for optional (user-supplied) external  
excitation, and is common to all channels. The conditioned strain gauge signals are routed to  
eight single-ended analog inputs on the DAQ board.  
Note: The NB-MIO-16H and AT-MIO-16H series boards have a maximum gain of 8 and  
are not intended for interfacing to low-level signals. Therefore, you should not use  
these boards with the SC-2043-SG.  
The SC-2043-SG has additional breakout screw terminals for convenient signal termination of  
additional analog inputs, analog outputs, and digital and timing I/O lines on the DAQ board  
interfacing connector.  
The SC-2043-SG is a circuitboard assembly that is placed on a workbench or mounted in a 19-in.  
rack. The SC-2043-SG draws power from the DAQ board via the 50-pin interfacing connector.  
A green LED indicates when the board is powered on.  
What You Need to Get Started  
To set up and use your SC-2043-SG, you will need the following components:  
SC-2043-SG board  
SC-2043-SG User Manual  
SC-2043-SG screw terminal labels  
One of the following software packages and documentation:  
LabVIEW for Macintosh  
LabVIEW for Windows  
LabWindows/CVI for Windows  
NI-DAQ for Macintosh  
NI-DAQ for PC compatibles  
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Introduction  
Chapter 1  
One of the following:  
SH6850 cable or R6850 cable assembly kit (MIO E Series DAQ board)  
NB-1 cable (MIO Series, Lab-PC+, or DAQPad-1200 board)  
PR50-50F cable (DAQCard-1200)  
Detailed specifications of the SC-2043-SG are in Appendix A, Specifications.  
Software Programming Choices  
There are several options to choose from when programming your National Instruments DAQ  
and SCXI hardware. You can use LabVIEW, LabWindows/CVI, NI-DAQ, or register-level  
programming.  
LabVIEW and LabWindows/CVI Application Software  
LabVIEW and LabWindows/CVI are innovative program development software packages for  
data acquisition and control applications. LabVIEW uses graphical programming, whereas  
LabWindows/CVI enhances traditional programming languages. Both packages include  
extensive libraries for data acquisition, instrument control, data analysis, and graphical data  
presentation.  
LabVIEW features interactive graphics, a state-of-the-art user interface, and a powerful graphical  
programming language. The LabVIEW Data Acquisition VI Library, a series of VIs for using  
LabVIEW with National Instruments DAQ hardware, is included with LabVIEW. The  
LabVIEW Data Acquisition VI Libraries are functionally equivalent to the NI-DAQ software.  
LabWindows/CVI features interactive graphics, a state-of-the-art user interface, and uses the  
ANSI standard C programming language. The LabWindows/CVI Data Acquisition Library, a  
series of functions for using LabWindows/CVI with National Instruments DAQ hardware, is  
included with LabWindows/CVI. The LabWindows/CVI Data Acquisition libraries are  
functionally equivalent to the NI-DAQ software.  
Using LabVIEW or LabWindows/CVI software will greatly reduce the development time for  
your data acquisition and control application.  
NI-DAQ Driver Software  
The NI-DAQ driver software is included at no charge with all National Instruments DAQ  
hardware. NI-DAQ is not packaged with SCXI or accessory products, except for the  
SCXI-1200. NI-DAQ has an extensive library of functions that you can call from your  
application programming environment. These functions include routines for analog input  
(A/D conversion), buffered data acquisition (high-speed A/D conversion), analog output  
(D/A conversion), waveform generation, digital I/O, counter/timer operations, SCXI, RTSI,  
self calibration, messaging, and acquiring data to extended memory.  
NI-DAQ has both high-level DAQ I/O functions for maximum ease of use and low-level DAQ  
I/O functions for maximum flexibility and performance. Examples of high-level functions are  
streaming data to disk or acquiring a certain number of data points. An example of a low-level  
function is writing directly to registers on the DAQ device. NI-DAQ does not sacrifice the  
performance of National Instruments DAQ devices because it lets multiple devices operate at  
their peak performance.  
NI-DAQ also internally addresses many of the complex issues between the computer and the  
DAQ hardware such as programming the PC interrupt and DMA controllers. NI-DAQ maintains  
a consistent software interface among its different versions so that you can change platforms with  
SC-2043-SG User Manual  
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Chapter 1  
Introduction  
minimal modifications to your code. Figure 1-1 illustrates the relationship between NI-DAQ and  
LabVIEW and LabWindows/CVI.  
Conventional  
Programming  
Environment  
(PC, Macintosh, or  
Sun SPARCstation)  
LabVIEW  
(PC, Macintosh, or  
Sun SPARCstation)  
LabWindows/CVI  
(PC or  
Sun SPARCstation)  
NI-DAQ  
Driver Software  
Personal  
Computer  
or  
DAQ or  
SCXI Hardware  
Workstation  
Figure 1-1. The Relationship between the Programming Environment,  
NI-DAQ, and Your Hardware  
Register-Level Programming  
The final option for programming any National Instruments DAQ hardware is to write register-  
level software. Writing register-level programming software can be very time-consuming and  
inefficient and is not recommended for most users.  
Even if you are an experienced register-level programmer, consider using NI-DAQ, LabVIEW,  
or LabWindows/CVI to program your National Instruments DAQ hardware. Using the NI-DAQ,  
LabVIEW, or LabWindows/CVI software is easier than and as flexible as register-level  
programming and can save you weeks of development time.  
Optional Equipment  
Contact National Instruments to order the following optional equipment:  
•
•
•
•
Single or double height rack-mount kit with acrylic plastic cover  
Single or double height rack-mount kit with metal wraparound cover  
120 Ω (0.1%, 10 ppm/°C) quarter-bridge completion resistors (eight per package)  
350 Ω (0.1%, 10 ppm/°C) quarter-bridge completion resistors (eight per package)  
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Introduction  
Chapter 1  
Unpacking  
Your SC-2043-SG board is shipped in an antistatic package to prevent electrostatic damage to  
the board. Electrostatic discharge can damage several components on the board. To avoid such  
damage in handling the board, take the following precautions:  
•
•
•
Ground yourself via a grounding strap or by holding a grounded chassis such as a computer  
chassis.  
Touch the antistatic package to a metal part of your computer chassis before removing the  
board from the package.  
Remove the board from the package and inspect the board for loose components or any other  
sign of damage. Notify National Instruments if the board appears damaged in any way.  
Do not install a damaged board into your computer.  
•
Never touch the exposed pins of connectors.  
SC-2043-SG User Manual  
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Chapter 2  
Installation and Configuration  
This chapter 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.  
Installation  
Note: You must power off your computer—and the SC-2043-SG if externally powered—  
before installing or making any connection to the SC-2043-SG.  
The SC-2043-SG includes two 50-pin cable connectors for signal connection to a DAQ board.  
Connect the SC-2043-SG to your DAQ board I/O connector using the appropriate cable and  
SC-2043-SG 50-pin connector. Table 2-1 lists the required cables and connectors to use with  
each DAQ board option.  
Table 2-1. Installation and Cabling Options for the SC-2043-SG  
DAQ Board  
Required Cabling  
SC-2043-SG 50-Pin Connector  
68-pin MIO E Series  
boards1  
R6850 or SH6850  
MIO (J10)  
50-pin MIO boards2  
100-pin MIO boards3  
Lab-PC+, DAQPad-1200  
DAQCard-1200  
NB1  
MIO (J10)  
R1005050  
NB1  
MIO (J10)  
Lab/1200 (J9)  
Lab/1200 (J9)  
PR50-50F  
1
2
To install the SC-2043-SG with any of these boards, refer to the installation guide of the cable kit for instructions.  
The NB-MIO-16H and AT-MIO-16H boards have a maximum gain of 8 and are not intended for interfacing to low-level  
signals. Therefore, you should not use these boards with the SC-2043-SG.  
3
The SC-2043-SG connects only to pins 1–50 (ACH<0..15>) of the 100-pin MIO boards.  
You can mount the SC-2043-SG in a rack-mount chassis using the mounting holes in the four  
corners of the SC-2043-SG board.  
The SC-2043-SG is installed. You are now ready to install and configure your software. If you  
are using NI-DAQ, LabVIEW, or LabWindows/CVI, refer to the installation instructions to  
install and configure your software.  
Board Configuration  
Note: You must configure your DAQ board analog channels for NRSE (nonreferenced  
single-ended) inputs for use with the SC-2043-SG.  
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Installation and Configuration  
Chapter 2  
The SC-2043-SG has one slide switch and 12 jumpers that you use to configure your board.  
Figure 2-1 shows the switch and jumpers in the parts locator diagram.  
1
5
7
14  
11  
12  
2
3
4
6
8
9
10  
13  
15  
16  
17  
18  
19  
21  
20  
22  
24  
26  
28  
30  
23  
25  
27  
29  
31  
33  
32  
34  
36  
55  
54  
53  
35  
52  
51  
50  
49  
48  
43  
37  
38  
39  
40  
41  
42  
44  
45  
46  
47  
1
Screen Printed Screw  
Terminal Label  
J1  
J3  
J5  
W1  
J7  
W3  
R2  
J8  
14 Product Name and  
Assembly Number  
15 SW1  
16 R9  
17 W10  
18 J9  
19 J10  
20 F3  
21 R23  
22 R17  
27 R37  
28 W12  
29 R51  
30 R54  
31 R55  
32 W13  
33 R65  
34 R69  
35 Serial Number  
36 W9  
37 R18  
38 R30  
39 R34  
41 R53  
42 R62  
43 R68  
44 W7  
45 W6  
46 W5  
47 W4  
48 R6  
49 R20  
50 R36  
51 R52  
52 W2  
53 J6  
2
3
4
5
6
7
8
9
10 F1  
11 F2  
12 R14  
13 W8  
23 R19  
24 W11  
25 R33  
26 R35  
40 R50  
54 J4  
55 J2  
Figure 2-1. SC-2043-SG Parts Locator Diagram  
SC-2043-SG User Manual  
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Chapter 2  
Installation and Configuration  
Switch SW1 selects the power supply source for the SC-2043-SG board. Two jumpers, W1 and  
W3, select the excitation source for the strain gauge bridges. Jumper W2 routes either the  
excitation voltage signal or the channel 0 signal to analog input channel 0 on the DAQ board.  
Jumper W8 routes either the excitation voltage signal or an external signal to analog input  
channel 8 (for MIO and MIO E Series boards only). Jumpers W4–W7 and W10–W13 configure  
the onboard bridge completion network for each of the eight channels for either half-bridge or  
full-bridge inputs. Tables 2-2 through 2-6 show the settings for the switch and jumpers.  
Power Supply Selection  
Set switch SW1 to the INT position to draw power from the +5 V line on the DAQ board. Set  
switch SW1 to the EXT position to draw power from an external +5 V power supply connected  
to J8. In external power mode, the SC-2043-SG has two fuses, F1 and F2, to limit the current to  
1 A at +5 V. The board also has a spare fuse (F3), as shown in Figure 2-1.  
Note: If you are using an NB-MIO-16X or a DAQPad-1200 with the SC-2043-SG, you must  
use an external +5 V power supply with the SC-2043-SG.  
Table 2-2. Power Supply Selection  
Switch  
Description  
Configuration  
SW1  
INT position—Use this setting to  
configure the SC-2043-SG to draw  
power through the DAQ board.  
(factory setting)  
EXT INT  
J8  
SW1  
SW1  
EXT position—Use this setting to  
draw +5 V power from an external  
supply connected to connector J8.  
EXT INT  
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Installation and Configuration  
Chapter 2  
Onboard/External Excitation Selection  
If you want to use the onboard voltage excitation source to excite your strain gauge bridges, set  
both jumpers W1 and W3 to the INT position. If you want to use an external excitation source,  
set both jumpers W1 and W3 to the EXT position and connect your excitation source to  
connector J7.  
Table 2-3. Onboard/External Excitation Jumpers  
Jumpers  
Description  
Configuration  
W1, W3  
EXT  
INT position—Place jumpers W1  
and W3 in this position to provide  
excitation voltage from the onboard  
excitation source. (factory setting)  
J7  
INT  
W1  
W3  
W1, W3  
EXT  
EXT position—Place jumpers W1  
and W3 in this position to provide  
excitation voltage from an external  
excitation source connected to  
connector J7.  
INT  
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Chapter 2  
Installation and Configuration  
Local Excitation Sense Selection  
MIO or MIO E Series Boards  
If you are using the SC-2043-SG with an MIO or MIO E Series board, you can locally sense the  
exact level of the excitation voltage by routing the excitation voltage (internal or external) to one  
of two analog channels, selected by jumpers W8 and W2. Table 2-4 shows these jumper  
settings.  
Setting jumper W8 to the EX position (the factory setting) routes the excitation voltage to ACH8  
so you can use ACH<0..7> for conditioned strain gauge signal inputs. Setting jumper W8 to the  
ST position routes an external signal (from the screw terminal labeled 4 in the MIO column, or  
ACH8 if you are using the stick-on labels) to ACH8.  
Setting jumper W2 to the EX position routes the excitation voltage to ACH0, leaving you  
ACH<1..7> for conditioned strain gauge signal inputs. Setting jumper W2 to the CH0 position  
(the factory setting) routes the conditioned strain gauge bridge signal (that entered via the CH0±  
screw terminals) to ACH0.  
Table 2-4. Local Excitation Sense Jumper Settings for MIO and MIO E Series Boards  
Jumper  
Description  
Configuration  
W2  
EX  
CH0 position—Place the jumper in  
this position to route the conditioned  
strain gauge bridge signal (that  
entered via the CH0± screw  
CH0  
terminals) to ACH0. (factory setting)  
W2  
W2  
EX  
EX position—Place the jumper in  
this position to route the excitation  
source voltage to ACH0.  
CH0  
W8  
EX position—Place the jumper in  
this position to route the excitation  
source voltage to ACH8. (factory  
setting)  
EX  
ST  
W8  
W8  
ST position—Place the jumper in this  
position to route an external input  
signal to ACH8.  
EX  
ST  
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Installation and Configuration  
Chapter 2  
Lab/1200 Series Boards  
If you are using the SC-2043-SG with a Lab/1200 Series board, you can locally sense the exact  
level of the excitation voltage by routing the excitation voltage (internal or external) to ACH0,  
configured by jumper W2. The SC-2043-SG also has jumper W8, which you must also  
configure. Table 2-5 shows these jumper settings.  
Caution: Although the factory-default setting for jumper W8 is the EX position, you MUST  
set jumper W8 to the ST position if you are using a Lab/1200 Series board.  
Failure to do so can damage your Lab/1200 board if your excitation voltage  
exceeds 10 V. National Instruments is NOT liable for any damages resulting from  
incorrect configuration of jumper W8. Refer to Table 2-5 for more information.  
Setting jumper W8 to the ST position routes DAC1OUT (pin 12 on the Lab/1200 connector) to  
the screw terminal labeled 12 in the Lab/1200 column, or DAC1OUT if you are using the stick-  
on labels.  
Setting jumper W2 to the EX position routes the excitation voltage to ACH0, leaving you  
ACH<1..7> for strain gauge signal measurement. Setting jumper W2 to the CH0 position (the  
factory setting) routes the conditioned strain gauge bridge signal (that entered via the CH0±  
screw terminals) to ACH0.  
Table 2-5. Local Excitation Sense Jumper Settings for Lab/1200 Series Boards  
Jumper  
Description  
Configuration  
W2  
CH0 position—Place the jumper in  
this position to route the conditioned  
strain gauge bridge signal (that  
entered via the CH0± screw  
EX  
CH0  
terminals) to ACH0. (factory setting)  
W2  
EX  
W2  
EX position—Place the jumper in  
this position to route the excitation  
source voltage to ACH0.  
CH0  
W8  
EX position—NEVER leave the  
jumper in this position. (factory  
setting)  
EX  
ST  
ST  
W8  
EX  
ST position—Always keep the  
jumper in this position to route the  
DAC1OUT analog output signal  
from the Lab/1200 board to a screw  
terminal.  
W8  
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Chapter 2  
Installation and Configuration  
Bridge Completion Selection  
Jumpers W4–W7 and W10–W13 select half-bridge or full-bridge configuration for each channel  
on the SC-2043-SG. Setting a jumper in the FB position disconnects the half-bridge completion  
network from the channel and connects the CHn- screw terminal to the negative input of the  
instrumentation amplifier for full-bridge signal inputs. Setting a jumper in the HB position  
disconnects the CHn- screw terminal from the instrumentation amplifier and connects the half-  
bridge completion network to the negative input of the instrumentation amplifier. Table 2-6  
shows the jumper settings for the half-bridge completion jumpers and Table 2-7 lists their  
corresponding channels.  
Table 2-6. Half-Bridge Completion Jumper Settings  
Jumper  
Description  
Configuration  
FB  
HB  
W5  
W4 W10  
FB position—Use this setting to  
select full-bridge completion.  
(factory setting)  
W11  
W6 W7 W13 W12  
FB  
HB  
HB position—Use this setting to  
select half-bridge completion.  
Table 2-7. Half-Bridge Completion Jumpers and Corresponding Channels  
Channel  
Jumper  
0
1
2
3
4
5
6
7
W7  
W6  
W5  
W4  
W13  
W12  
W11  
W10  
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Installation and Configuration  
Chapter 2  
Additionally, there are sockets for eight quarter-bridge completion resistors. When inserted, the  
quarter-bridge completion resistors connect to the positive inputs of the instrumentation  
amplifiers and the -EXn terminals. To configure a channel for quarter-bridge completion, set the  
corresponding bridge completion jumper to the HB position and insert your quarter-bridge  
completion resistor into the appropriate sockets. The parts locator diagram, Figure 2-1, shows  
where these quarter-bridge completion resistor sockets are located. Table 2-8 lists the quarter-  
bridge completion resistors and corresponding channels.  
Table 2-8. Quarter-Bridge Completion Resistors and Corresponding Channels  
Channel  
Resistor  
0
1
2
3
4
5
6
7
R52  
R36  
R20  
R6  
R54  
R37  
R23  
R9  
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Chapter 3  
Signal Connections  
This chapter describes the signal connections to the SC-2043-SG board.  
I/O Connector Pin Description  
Warning: Connections, including any power signals connected to ground and vice versa, that  
exceed any of the maximum input or output signal ratings on the SC-2043-SG and  
the DAQ board can damage the SC-2043-SG, the DAQ board, and the computer.  
National Instruments is NOT liable for any damages resulting from any such  
signal connections.  
The SC-2043-SG has two male 50-pin I/O connectors to connect it to a DAQ board. These  
connectors, J9 and J10, are labeled Lab/1200 and MIO, respectively. The Lab/1200 connector  
(J9) carries the signals between the SC-2043-SG and a Lab/1200 board. The MIO connector  
(J10) carries the signals between the SC-2043-SG and an MIO or MIO E Series board. You can  
use only one of these connectors to interface to a DAQ board at any time. Figure 2-1 shows the  
position of these connectors on the SC-2043-SG board.  
Notes: If you are connecting to an MIO or MIO E Series board, you must use the MIO  
connector. If you are connecting to a Lab/1200 board, you must use the Lab/1200  
connector. These connectors are NOT pin-for-pin compatible and, therefore, you  
must be careful NOT to use the wrong connector.  
Connector W9 is reserved for National Instruments internal use only.  
Tables 3-1 and 3-2 show the pin assignments for the SC-2043-SG I/O connectors. These tables  
list the pin numbers of the I/O connector and the corresponding signal names for the MIO  
connector if you are using an MIO or MIO E Series DAQ board, and for the Lab/1200 connector  
if you are using a Lab/1200 Series DAQ board. Tables 3-3 and 3-4 list the MIO and Lab/1200  
I/O connector signal summaries, respectively.  
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Signal Connections  
Chapter 3  
Table 3-1. Pin Assignments for the MIO I/O Connectors  
Pin Numbers  
MIO Connector Signal MIO E Series I/O Connector  
Names  
AIGND  
AIGND  
ACH0†  
ACH8  
Signal Names  
AIGND  
AIGND  
ACH0†  
ACH8  
1
2
3
4
5
ACH1†  
ACH9  
ACH1†  
ACH9  
6
7
ACH2†  
ACH10  
ACH3†  
ACH11  
ACH4†  
ACH12  
ACH5†  
ACH13  
ACH6†  
ACH14  
ACH7†  
ACH15  
AISENSE  
DAC0OUT  
DAC1OUT  
EXTREF  
AOGND  
DGND  
ACH2†  
ACH10  
ACH3†  
ACH11  
ACH4†  
ACH12  
ACH5†  
ACH13  
ACH6†  
ACH14  
ACH7†  
ACH15  
AISENSE  
DAC0OUT  
DAC1OUT  
EXTREF  
AOGND  
DGND  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
ADIO0  
BDIO0  
ADIO1  
BDIO1  
ADIO2  
BDIO2  
ADIO3  
BDIO3  
DGND†  
+5 V†  
DIO0  
DIO4  
DIO1  
DIO5  
DIO2  
DIO6  
DIO3  
DIO7  
DGND†  
+5 V†  
+5 V  
+5 V  
SCANCLK  
SCANCLK  
EXTSTROBE*  
††  
(continues)  
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Chapter 3  
Signal Connections  
Table 3-1. Pin Assignments for the MIO I/O Connectors (Continued)  
Pin Numbers  
MIO Connector Signal MIO E Series I/O Connector  
Names  
Signal Names  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
††  
††  
TRIG1  
TRIG2  
EXTCONV*  
SOURCE1  
GATE1  
CONVERT*  
GPCTR1_SOURCE  
GPCTR1_GATE  
GPCTR1_OUT  
UPDATE*  
OUT1  
††  
GATE2  
OUT2  
WFTRIG  
STARTSCAN  
GPCTR0_SOURCE  
GPCTR0_GATE  
GPCTR0_OUT  
FREQ_OUT  
SOURCE5  
GATE5  
OUT5  
FOUT  
†
These signals are not routed to screw terminals. All other signals on the I/O connectors are routed directly to  
screw terminals (J1–J6) for convenient signal termination.  
†† The function of this connector pin varies depending on the type of MIO Series board you have. Refer to your  
MIO board user manual for the appropriate pin name.  
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Signal Connections  
Chapter 3  
Table 3-2. Pin Assignments for the Lab/1200 I/O Connector  
Pin Numbers  
Lab/1200 Connector  
Signal Names  
1
ACH0†  
ACH1†  
ACH2†  
ACH3†  
ACH4†  
ACH5†  
ACH6†  
ACH7†  
AISENSE  
DAC0OUT  
AGND  
DAC1OUT  
DGND  
PA0  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
PA1  
PA2  
PA3  
PA4  
PA5  
PA6  
PA7  
PB0  
PB1  
PB2  
PB3  
PB4  
PB5  
PB6  
PB7  
PC0  
PC1  
PC2  
PC3  
PC4  
PC5  
PC6  
PC7  
(continues)  
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Chapter 3  
Signal Connections  
Table 3-2. Pin Assignments for the Lab/1200 I/O Connector (Continued)  
Pin Numbers  
Lab/1200 Connector  
Signal Names  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
EXTTRIG  
EXTUPDATE*  
EXTCONV*  
OUTB0  
GATB0  
OUTB1  
GATB1  
CLKB1  
OUTB2  
GATB2  
CLKB2  
+5 V†  
DGND†  
†
These signals are not routed to screw terminals. All other signals on the I/O connectors are routed directly to  
screw terminals (J1–J6) for convenient signal termination.  
Table 3-3. MIO (J10) I/O Connectors Signal Summary  
Signal Name  
Pin Number  
Description  
AIGND  
2
Analog Input Ground—This pin provides the AC noise current return  
point for the analog circuitry and for the onboard excitation supply. It is  
also routed to a screw terminal.  
AISENSE  
19  
Analog Input Sense—This pin is the reference node for the conditioned  
strain gauge bridge signals. It is also routed to a screw terminal to  
provide a reference for analog inputs on channels ACH<8..15>.  
AISENSE is directly connected to the excitation supply return and is  
earth-grounded. This makes AISENSE a low impedance reference;  
therefore, all signals referenced to it MUST be floating.  
ACH<0..7>  
DGND  
3, 5, 7, 9, 11,  
13, 15, 17  
Analog Input Channels 0 through 7—These pins carry the conditioned  
strain gauge bridge signals (referenced to AISENSE) to the DAQ board.  
They are not routed to screw terminals.  
24  
Digital Ground—This pin is the reference for the +5 VDC power supply.  
It is also routed to a screw terminal to provide a reference for the digital  
signals at the screw terminals.  
33  
This pin establishes the DC return path for the onboard excitation supply.  
It is not routed to a screw terminal.  
+5 V  
34  
+5 VDC Source—This pin provides DC power for the SC-2043-SG from  
the MIO or MIO E Series board. It is not routed to a screw terminal.  
Others  
Others  
The remaining pins are routed directly to screw terminals to provide easy  
access to the additional analog, digital, and counter/timer I/O signals of  
the DAQ board. Refer to the Signal Connections chapter in your DAQ  
board user manual for pin descriptions.  
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Signal Connections  
Chapter 3  
Table 3-4. Lab/1200 (J9) I/O Connector Signal Summary  
Signal Name  
Pin Number  
Description  
AGND  
11  
Analog Ground—This pin provides the AC noise current return point for  
the analog circuitry and for the onboard excitation supply. It is also  
routed to a screw terminal.  
AISENSE  
9
Analog Input Sense—This pin is the reference node for the conditioned  
strain gauge bridge signals. It is also routed to a screw terminal.  
AISENSE is directly connected to the excitation supply return and is  
earth-grounded. This makes AISENSE a low impedance reference;  
therefore, all signals referenced to it MUST be floating.  
ACH<0..7>  
DGND  
1–8  
13  
Analog Input Channels 0 through 7—These pins carry the conditioned  
strain gauge bridge signals (referenced to AISENSE) to the DAQ board.  
They are not routed to screw terminals.  
Digital Ground—This pin is the reference for the +5 VDC power supply.  
It is also routed to a screw terminal to provide a reference for the digital  
signals at the screw terminals.  
50  
This pin establishes the DC return path for the onboard excitation supply.  
It is not routed to a screw terminal.  
+5 V  
49  
+5 VDC Source—This pin provides DC power for the SC-2043-SG from  
the Lab/1200 board. It is not routed to a screw terminal.  
Others  
Others  
The remaining pins are routed directly to screw terminals to provide easy  
access to the additional analog, digital, and counter/timer I/O signals of  
the DAQ board. Refer to the Signal Connections chapter in your DAQ  
board user manual for pin descriptions.  
Screw Terminal Description  
Screw terminal blocks J1–J6, shown in Figure 2-1, provide excitation output and strain gauge  
bridge signal inputs, and terminate signals on the MIO and Lab/1200 I/O connectors. Two sets  
of labels are silkscreened onto the SC-2043-SG board for these screw terminals—one set for the  
MIO connector and the other for the Lab/1200 connector. Notice that only the excitation output  
screw terminals, +EXn, -EXn (n is the channel number), and the analog signal input screw  
terminals CHn+ and CHn- have signal names. All other screw terminals on terminal blocks  
J1–J6 are labeled with the pin numbers of the MIO and Lab/1200 I/O connector pins to which  
they are mapped.  
Additionally, a sheet of sticker labels printed with signal names for every screw terminal is  
included with your SC-2043-SG. This sheet consists of three sets of sticker labels, one set  
printed with MIO Series signal names, one set with Lab/1200 Series signal names, and one set  
with MIO E Series signal names. You can peel off the appropriate set of sticker labels and apply  
them on the SC-2043-SG board over the silkscreened labels by following these steps:  
1. Select the set of sticker labels (MIO, Lab/1200, or MIO E Series) that corresponds to the type  
of DAQ board to which you are connecting the SC-2043-SG.  
2. Peel off each of the three labels and mount them on the SC-2043-SG over the silkscreened  
labels. For the Lab/1200 boards, make sure you match the sticker label signal numbers to the  
Lab/1200 silkscreened signal numbers on the board.  
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Chapter 3  
Signal Connections  
Table 3-5 lists the screw terminals (J1–J6) signal summary.  
Table 3-5. Screw Terminals J1–J6 Signal Summary  
Signal Name  
Description  
CH<0..7>±  
Input Channels—These inputs are the input signals for analog channels  
0 through 7.  
±EX<0..7>  
Voltage Excitation Outputs—These output signals route the excitation  
voltage supply (internal or external) to the sensors connected to these  
channels.  
Others  
All other screw terminals provide signal termination for the remaining I/O  
lines of the DAQ board, except ACH<0..7>, +5 V, and one DGND line.  
Refer to Tables 3-1 and 3-2 for these signal pin numbers.  
If you are not using the sticker labels that come in the SC-2043-SG kit, the  
numbers silkscreened on the board beside these screw terminals are the  
pin numbers of the MIO and Lab/1200 I/O connector pins to which they  
are mapped.  
There are two additional screw terminal blocks, J7 and J8, shown in Figure 2-1. Screw terminal  
block J7 is for external voltage excitation input signals, which hook up to the +EX and -EX  
terminals. When the SC-2043-SG is configured for external excitation, the ±EX inputs are  
routed directly to the ±EX<0..7> excitation output screw terminals.  
Note: The -EX input signal is connected to DGND on the SC-2043-SG. Because this low-  
impedance connection can cause a ground loop, which may affect your measurements,  
your excitation voltage source MUST be floating.  
Screw terminal block J8 is for external +5 V power inputs, which hook up to the +5 V signal and  
ground terminals. When the SC-2043-SG is configured for external power these inputs provide  
power to the SC-2043-SG.  
Note: The ground input signal is directly connected to DGND on the SC-2043-SG. In order  
to avoid a ground loop, which may affect your measurements, your +5 V power supply  
MUST be floating.  
Analog Input Connections  
Sensor Connection to the SC-2043-SG  
You can connect strain gauges to the SC-2043-SG in full-bridge, half-bridge, and quarter-bridge  
configurations. See Chapter 2, Installation and Configuration, to make sure that you have  
configured the SC-2043-SG channels correctly before you connect any sensors to them.  
Note: Configure any unused channels for full-bridge connections and short their input screw  
terminals (CHn±) to their excitation return screw terminals (-EXn).  
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Signal Connections  
Chapter 3  
Full-Bridge Connection  
In this configuration all four elements of the bridge are external to the SC-2043-SG. Four lead  
wires connect the full-bridge to screw terminals +EXn, -EXn, CHn+, and CHn-. The pair of  
wires connected to +EXn and -EXn provides excitation voltage to the bridge, and the other pair  
connected to CHn+ and CHn- senses the output voltage of the bridge. Figure 3-1 shows this  
configuration, along with the appropriate half-bridge jumper placement.  
Full Bridge  
+EX  
+EXn  
CHn+  
CHn-  
-EXn  
FB  
HB  
x10  
Half-Bridge  
Completion  
Jumper  
Half-Bridge  
Completion  
Reference  
Figure 3-1. Full-Bridge Connection to the SC-2043-SG  
Half-Bridge Connection  
In this configuration only two strain gauges are used. Bridge completion is provided by a half-  
bridge completion reference internal to the SC-2043-SG. Three lead wires connect the half-  
bridge to screw terminals +EXn, -EXn, and CHn+. The pair of wires connected to +EXn and  
-EXn provides excitation voltage to the half-bridge, and the other wire connected to CHn+ senses  
the output voltage of the half-bridge with respect to the internal half-bridge completion reference.  
Figure 3-2 shows this configuration, along with the appropriate half-bridge jumper placement.  
Half Bridge  
+EX  
+EXn  
CHn+  
CHn-  
-EXn  
FB  
HB  
x10  
Half-Bridge  
Completion  
Jumper  
Half-Bridge  
Completion  
Reference  
Figure 3-2. Half-Bridge Connection to the SC-2043-SG  
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Chapter 3  
Signal Connections  
Quarter-Bridge Connection  
In this configuration only one strain gauge is used. Bridge completion is provided by the internal  
half-bridge completion reference as well as a quarter-bridge completion resistor. This quarter-  
bridge completion resistor is equal in value to the external strain gauge element. Insert your  
completion resistor in the appropriate sockets. Two lead wires connect the quarter-bridge strain  
gauge to screw terminals +EXn and CHn+. If your strain gauge has three lead wires—two wires  
at one end and one at the other end—connect the two wires sharing the same end of the strain  
gauge at the CHn+ screw terminal, and connect the single wire end to the +EXn screw terminal.  
Figure 3-3 shows this configuration, along with the appropriate quarter-bridge completion  
resistor and half-bridge jumper placement.  
Quarter Bridge  
+EX  
+EXn  
CHn+  
CHn-  
-EXn  
FB  
HB  
x10  
Half-Bridge  
Completion  
Jumper  
Half-Bridge  
Completion  
Reference  
Quarter Bridge  
Completion Resistor  
(User Installed)  
Figure 3-3. Quarter-Bridge Connection to the SC-2043-SG  
Offset Nulling  
Offset Nulling Adjustment  
The SC-2043-SG has circuitry for offset nulling adjustment of Wheatstone bridges. The nulling  
circuitry uses the excitation voltage as a reference and operates with full-bridge, half-bridge and  
quarter-bridge strain gauge configurations. Each channel has its own nulling circuit, with a  
trimming potentiometer to adjust the nulling voltage level, listed in Table 3-6.  
Table 3-6. Offset Nulling Adjust Potentiometer and Corresponding Channel  
Channel  
Trimming Potentiometer  
0
1
2
3
4
5
6
7
R62  
R50  
R30  
R14  
R65  
R51  
R33  
R17  
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Signal Connections  
Chapter 3  
To null the static voltage offset of the system, including the bridge, use the following procedure:  
1. Configure and connect your bridge to the selected channel.  
2. Read the channel output.  
3. While monitoring the output, rotate the trimming potentiometer wiper with a flathead  
screwdriver until you reach 0 V.  
You have nulled your system offset and are ready for a measurement.  
Nulling Range Adjustment  
The nulling range of the offset nulling circuitry is approximately ±5 mV referred to input (RTI),  
assuming an excitation voltage of 2.5 V. The nulling circuit of each channel has a resistor which  
sets this nulling range. You can change the nulling range of the offset nulling circuitry for each  
channel by replacing its nulling resistor with a resistor of another value. Therefore, you can mix  
your ranges to accommodate each channel requirement. Table 3-7 lists the nulling resistors and  
their corresponding channels.  
Table 3-7. Nulling Resistor and Corresponding Channel  
Channel  
Nulling Resistor  
0
1
2
3
4
5
6
7
R68  
R53  
R34  
R18  
R69  
R55  
R35  
R19  
The value of all the nulling resistors on the SC-2043-SG is 47 kΩ. Notice that these resistors are  
socketed for easy replacement. These sockets best fit a 1/4 W resistor lead size.  
If you want to change the nulling range of any channel, use the following formula to determine  
the nulling resistor value you need to achieve your desired nulling range:  
100  
R
≈ EX  
Ω
null  
V
RTI  
desired nulling range  
where:  
R
is the nulling resistor value,  
null  
EX is the excitation voltage (factory-adjusted to 2.5 V),  
RTI is the desired nulling range, referred to input.  
V
desired nulling range  
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Chapter 3  
Signal Connections  
For example, assuming:  
EX = 2.5 V  
V
RTI = ±1 mV RTI  
desired nulling range  
Then, using the above formula, the new nulling resistor should have a value of:  
100  
R
≈ 2.5 V  
Ω
null  
±1 mV RTI  
≈250 kΩ  
Other Connection Considerations  
If you are using an MIO or MIO E Series board with 8 additional single-ended analog input  
channels, remember that your DAQ board will be configured for NRSE operation and all analog  
inputs are referenced to AISENSE (pin 19 on the MIO I/O connector).  
Note: AISENSE is ground referenced on the SC-2043-SG. In order to avoid a ground loop,  
which may affect your measurements, all analog input signals MUST be floating.  
For all other input and output signals, refer to the appropriate sections in your DAQ board user  
manual for additional signal connection information.  
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Chapter 4  
Theory of Operation  
This chapter contains a functional overview of the SC-2043-SG board and explains the operation  
of each functional unit making up the SC-2043-SG.  
Functional Overview  
The SC-2043-SG consists of eight channels, each comprising a bridge completion network, an  
instrumentation amplifier with a gain of 10, offset nulling, filtering, and screw terminal  
connections to accommodate strain gauge bridge measurements. An onboard excitation voltage  
source is provided, along with the option of user-supplied external excitation. Additional  
breakout screw terminals are also provided for signal termination of analog, digital, and timing  
I/O lines on the DAQ board I/O connector.  
The key functional components of the SC-2043-SG are:  
•
•
•
•
•
•
•
Bridge completion network  
Amplification  
Offset nulling  
Filtering  
MIO and Lab/1200 I/O connectors and breakout screw terminals  
Excitation voltage source  
Power supply  
The remainder of this chapter describes the theory of operation for each of these components.  
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Theory of Operation  
Chapter 4  
The block diagram in Figure 4-1 illustrates the key functional components of the SC-2043-SG.  
External Excitation  
External Power  
+5 V Gnd  
+
-
Onboard/External  
Excitation  
Onboard/External  
Power Supply  
Selection Switch  
Internal  
+2.5 V  
Excitation  
Power  
Converter  
Jumpers  
±15 V  
Half-Bridge  
Completion Reference  
+5 V  
+5 V  
EX0+  
CH0+  
CH0-  
EX0-  
ACH0  
ACH1  
ACH0  
ACH1  
Lowpass Filter  
(Buffered)  
x10  
Local Excitation  
Sense Jumper  
Offset  
Nulling  
Circuit  
ACH7  
ACH7  
ACH8  
Half-Bridge  
Completion  
Jumper  
DAC1OUT  
EX1+  
CH1+  
CH1-  
EX1-  
Lowpass Filter  
(Buffered)  
x10  
Offset  
Nulling  
Circuit  
Half-Bridge  
Completion  
Jumper  
EX7+  
CH7+  
CH7-  
EX7-  
Lowpass Filter  
(Buffered)  
x10  
Offset  
Nulling  
Circuit  
Half-Bridge  
Completion  
Jumper  
Local Excitation  
Sense Jumper  
Quarter-Bridge  
Completion Resistor  
(User-Installed)  
I/O Screw  
Terminals  
Unused Analog, Digital, and Timing I/O Lines of  
MIO, MIO E, or Lab/1200 Series Board  
Figure 4-1. SC-2043-SG Block Diagram  
SC-2043-SG User Manual  
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Chapter 4  
Theory of Operation  
Bridge Completion Network  
The SC-2043-SG provides onboard bridge completion that you can use with half-bridge and  
quarter-bridge networks.  
The SC-2043-SG has a single half-bridge reference that is common to all channels, consisting of  
a resistive divider network of two 2.5 kΩ resistors, with 0.02% ratio tolerance and 2 ppm/°C  
tracking temperature coefficient (TCR). Each channel has a jumper that configures the channel  
for either half-bridge or full-bridge inputs. When configured for half-bridge inputs, the jumper  
connects the half-bridge reference output to the negative input of the instrumentation amplifier in  
that channel for half-bridge completion. When configured for full-bridge inputs, the jumper  
disconnects the half-bridge reference output from the instrumentation amplifier negative input  
and connects the negative input to the CHn- screw terminal for full-bridge signal inputs.  
Additionally, sockets are provided for eight quarter-bridge completion resistors. When inserted,  
the quarter-bridge completion resistors are connected to the positive inputs of the instrumentation  
amplifiers and the -EXn terminals, as shown in the block diagram.  
Amplification  
Each channel of the SC-2043-SG has an instrumentation amplifier with a fixed gain of 10, to  
which the bridge output signals are routed. The instrumentation amplifier inputs are protected  
from over-voltages up to ±45 V with the SC-2043-SG powered on and ±30 V powered off.  
These amplifiers fulfill two purposes on the SC-2043-SG board. First, they convert differential  
input signals into single-ended signals referred to the SC-2043-SG AISENSE node for input  
common-mode signal rejection. With this conversion, the SC-2043-SG can extract the bridge  
input signals from common-mode noise voltages before the DAQ board samples and converts the  
signals. Second, the instrumentation amplifiers amplify input signals, resulting in increased  
measurement resolution and accuracy.  
Note: If you select the SC-2043-SG as an accessory when you configure your DAQ board  
using the NI-DAQ software, NI-DAQ compensates for the gain of 10 by automatically  
dividing any input channels 0 through 7 by 10 on the DAQ board.  
Configure all unused channels for full-bridge connections and short their inputs to  
their respective excitation return screw terminals (-EXn). If the inputs are left open-  
circuited, the unused channels will saturate, causing the power consumption of the  
SC-2043-SG board to increase significantly.  
Offset Nulling  
The SC-2043-SG has circuitry for offset nulling adjustment of Wheatstone bridges. The nulling  
circuitry uses the excitation voltage as a reference and operates with full-bridge, half-bridge and  
quarter-bridge strain gauge configurations. Each channel has its own nulling circuit, with a  
trimming potentiometer to adjust the nulling voltage level. The nulling circuit of each channel  
also has a resistor that sets the nulling range. You can change the nulling range of the offset  
nulling circuitry for each channel by replacing its nulling resistor with a resistor of another value.  
Therefore, you can mix your ranges to accommodate each channel requirement. The offset  
nulling circuitry has the added advantage of nulling the offset voltages of your entire signal path,  
including the bridge, the SC-2043-SG channel, and the DAQ board analog input channel.  
© National Instruments Corporation  
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Theory of Operation  
Chapter 4  
Filtering  
Each channel of the SC-2043-SG has a postgain, lowpass filter. This filter is a single-pole,  
buffered, RC filter with a cutoff frequency of 1.6 kHz.  
I/O Connectors and Breakout Screw Terminals  
The outputs of all eight channels are connected to the ACH<0..7> analog input channel pins on  
the MIO I/O connector and the Lab/1200 I/O connector. All the remaining pins, except two, on  
these connectors are mapped to breakout screw terminals (J1–J6). These two pins are +5 V  
(pin 34 on the MIO and pin 49 on the Lab/1200 I/O connectors) and DGND (pin 33 on the MIO  
and pin 50 on the Lab/1200 I/O connectors). Refer to Chapter 3, Signal Connections, for the pin  
assignments of the I/O connectors and their mapping to the screw terminals.  
Excitation Voltage Source  
The SC-2043-SG has an onboard excitation voltage source for Wheatstone bridge excitation.  
This source is powered by the +5 V power supply and is routed to eight output screw terminal  
pairs (±EX<0..7>), one pair per channel. The excitation source provides an adjustable, regulated  
voltage output with a range of 1.5 to 2.5 VDC, controlled by a potentiometer (R2), and short-  
circuit current limiting (approximately 1 A). The factory-default onboard excitation source  
setting is 2.5 V. Screw terminals on J7 can connect an external excitation source of up to  
10 VDC to the SC-2043-SG. Two jumpers select whether the onboard excitation source or the  
external excitation source is routed to the output screw terminal pairs ±EX<0..7>. The offset  
nulling circuitry also uses the excitation source output as a reference.  
You can locally sense the exact level of the excitation voltage by routing the excitation voltage  
via jumpers W2 and W8 to ACH0 or ACH8 of the MIO board or to ACH0 on a Lab/1200 board.  
Refer to Chapter 2, Installation and Configuration, for further information on excitation source  
configuration.  
Note: There is NO onboard overvoltage protection and current limiting protection for the  
external excitation inputs. Therefore, if you select external excitation, you MUST  
ensure that your excitation supply does not exceed 10 V and is current-limited.  
Power Supply  
The SC-2043-SG contains an onboard power switch (SW1) to either power the SC-2043-SG  
from the DAQ board or draw power from an external +5 V supply. Fuses F1 and F2 limit the  
external +5 V power supply input to 1A at +5 V. The SC-2043-SG also has a spare fuse, F3, as  
shown in Figure 2-1. From the +5 V power supply, an onboard DC-DC converter generates a  
±15 V source, which is used to power the analog circuitry. The +5 V power supply also powers  
the onboard excitation supply. A green LED indicates that the board is receiving power.  
SC-2043-SG User Manual  
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Chapter 5  
Calibration Procedures  
This chapter discusses the calibration procedures for the SC-2043-SG board.  
Excitation Adjustment  
Onboard Excitation Source  
The excitation voltage source on the SC-2043-SG is factory-adjusted to 2.5 V ±0.5%. This  
circuit has one potentiometer (R2) that you must adjust to change the excitation voltage level on  
all eight output channels.  
Note: Because the offset nulling circuitry uses the excitation voltage as a reference, if you  
want to change the excitation voltage level or you are using external excitation, you  
MUST complete your excitation voltage level adjustments before adjusting the offset  
nulling circuitry. If you do not, you will have to readjust the offset nulling voltage  
levels on all channels.  
If you want to readjust the onboard excitation voltage level to a different value, you must  
perform the following steps:  
1. If you are using a rack-mount kit, remove the cover to expose the calibration pot.  
2. Configure all your strain gauge bridges to the desired SC-2043-SG channels so that the  
excitation voltage source is calibrated with the exact bridge load it must supply. Refer to  
Chapter 3, Signal Connections, for more information.  
Note: Remember to short the input terminals (CHn±) of any unused channel to its  
negative excitation output terminal (-EXn).  
3. Select and read the channel that is configured for local excitation sensing. If you have not  
configured the SC-2043-SG for local excitation sensing, refer to Chapter 2, Installation and  
Configuration, for more information.  
4. Adjust the potentiometer (R2) wiper with a flathead screwdriver until the voltage you are  
monitoring reaches the exact level desired.  
5. Replace the rack-mount chassis cover, if used.  
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Calibration Procedures  
Chapter 5  
External Excitation Source  
You can connect an external excitation source of up to 10 VDC to screw terminal block J7 on the  
SC-2043-SG. If you are using an external excitation source, you must perform the following  
steps.  
1. If you are using a rack-mount kit, remove the cover.  
Caution: If you are using the SC-2043-SG with a Lab/1200 board, you MUST set jumper  
W8 to the ST position. Failure to do so can damage your Lab/1200 board if  
your excitation voltage exceeds 10 V. National Instruments is NOT liable for  
any damages resulting from incorrect configuration of jumper W8. Refer to  
Table 2-5 and Chapter 2, Configuration and Installation, for more information.  
2. Configure the SC-2043-SG for external excitation so that your excitation source is connected  
to screw terminal block J7. Refer to Chapter 2, Installation and Configuration, and  
Chapter 3, Signal Connections, for more information.  
3. Configure all your strain gauge bridges to the desired SC-2043-SG channels so that the  
excitation voltage source is calibrated with the exact bridge load it must supply.  
Note: Remember to short the input terminals (CHn±) of any unused channel to its  
negative excitation output terminal (-EXn).  
4. Select and read the channel that is configured for local excitation sensing. If you have not  
configured the SC-2043-SG for local excitation sensing, refer to Chapter 2, Installation and  
Configuration, for more information.  
5. Adjust your excitation source output level until the voltage you are monitoring reaches the  
exact level desired. Do NOT exceed 10 VDC.  
6. Replace the rack-mount chassis cover, if used.  
SC-2043-SG User Manual  
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Appendix A  
Specifications  
This appendix lists the specifications for the SC-2043-SG. These are typical at 25° C unless otherwise noted.  
Analog Input  
Input Characteristics  
Number of channels .................................................... 8 differential  
Input signal ranges ...................................................... ±1 V (fixed gain of 10 on each channel)  
Max working voltage (signal + common mode)......... Each input should remain within ±11 V of ground  
Overvoltage protection ................................................ ±45 V powered on, ±30 V powered off  
Inputs protected.................................................... CH<0..7>±  
Transfer Characteristics  
Nonlinearity ................................................................ ±0.01% FSR  
Gain error .................................................................... ±0.15% of reading max  
Amplifier Characteristics  
Input impedance  
Normal powered on.............................................. 10 GΩ  
Powered off or overload....................................... 5.2 kΩ  
Input bias current ........................................................ ±2.5 nA  
Input offset current ...................................................... ±1.5 nA  
CMRR ......................................................................... 93 dB min  
Output range ................................................................ ±11 V  
Dynamic Characteristics  
Bandwidth ................................................................... 1.6 kHz (single-pole RC filter)  
System noise................................................................ 5 µVrms (referred to input)  
Stability  
Recommended warm-up time ..................................... 10 minutes  
Offset temperature coefficient..................................... ±3.5 µV/°C (referred to input)  
Gain temperature coefficient....................................... ±10 ppm/°C  
Excitation  
Channels ...................................................................... 1, connected to 8 screw terminal pairs  
Level............................................................................ 2.5 V, ±0.5% (adjustable from 1.5 to 2.5 V)  
1
Current drive .............................................................. 167 mA at 2.5 V  
Drift ............................................................................. ±480 ppm/°C  
1
Excitation current drive assumes eight full-bridge 120 Ω strain gauges.  
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Specifications  
Appendix A  
Bridge type .................................................................. Half or full (jumper-selectable); with sockets for quarter-  
bridge completion  
Bridge completion....................................................... Two 2.5 kΩ, ±0.02% ratio tolerance  
(±2 ppm/°C tracking TCR resistors)  
Offset nulling range .................................................... ±5 mV, referred to input  
Power Requirement (from DAQ Board)2  
+5 VDC (±10 %)  
Using external excitation ............................................ 570 mA  
Using internal 2.5 V excitation ................................... 600–770 mA  
3
Physical  
Dimensions.................................................................. 4.6 by 20.1 by 12.4 cm (1.8 by 7.9 by 4.9 in.)  
I/O connectors  
I/O signals ............................................................ 72 labeled screw terminals  
DAQ board connector .......................................... Two 50-pin ribbon-cable connectors  
Environment  
Operating temperature................................................. 0° to 50° C  
Storage temperature .................................................... -20° to 75° C  
Relative humidity ........................................................ 5% to 90% noncondensing  
2
Power requirements assume all eight inputs are used or shorted to their respective excitation return (-EXn) screw terminals.  
Open-circuited inputs will increase power requirements.  
When using internal excitation, the power requirement will depend on number and type of strain gauges. The maximum power  
3
requirement listed (770 mA) assumes eight 120 Ω full-bridge inputs. The minimum power requirement listed (600 mA)  
assumes one 350 Ω half-bridge input.  
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Appendix B  
Customer Communication  
For your convenience, this appendix contains forms to help you gather the information necessary  
to help us solve technical problems you might have as well as a form you can use to comment on  
the product documentation. Filling out a copy of the Technical Support Form before contacting  
National Instruments helps us help you better and faster.  
National Instruments provides comprehensive technical assistance around the world. In the U.S.  
and Canada, applications engineers are available Monday through Friday from 8:00 a.m. to  
6:00 p.m. (central time). In other countries, contact the nearest branch office. You may fax  
questions to us at any time.  
Corporate Headquarters  
(512) 795-8248  
Technical support fax: (800) 328-2203  
(512) 794-5678  
Branch Offices  
Australia  
Austria  
Belgium  
Canada Ontario)  
Canada (Quebec)  
Denmark  
Finland  
Phone Number  
03 9 879 9422  
0662 45 79 90 0  
02 757 00 20  
519 622 9310  
514 694 8521  
45 76 26 00  
90 527 2321  
1 48 14 24 24  
089 741 31 30  
2645 3186  
02 48301892  
03 5472 2970  
02 596 7456  
95 800 010 0793  
03480 33466  
32 84 84 00  
Fax Number  
03 9 879 9179  
0662 45 79 90 19  
02 757 03 11  
519 622 9311  
514 694 4399  
45 76 71 11  
90 502 2930  
1 48 14 24 14  
089 714 60 35  
2686 8505  
02 48301915  
03 5472 2977  
02 596 7455  
5 520 3282  
03480 30673  
32 84 86 00  
2265887  
France  
Germany  
Hong Kong  
Italy  
Japan  
Korea  
Mexico  
Netherlands  
Norway  
Singapore  
Spain  
Sweden  
2265886  
91 640 0085  
08 730 49 70  
056 20 51 51  
02 377 1200  
01635 523545  
91 640 0533  
08 730 43 70  
056 20 51 55  
02 737 4644  
01635 523154  
Switzerland  
Taiwan  
U.K.  
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Technical Support Form  
Photocopy this form and update it each time you make changes to your software or hardware, and use the completed  
copy of this form as a reference for your current configuration. Completing this form accurately before contacting  
National Instruments for technical support helps our applications engineers answer your questions more efficiently.  
If you are using any National Instruments hardware or software products related to this problem, include the  
configuration forms from their user manuals. Include additional pages if necessary.  
Name  
Company  
Address  
Fax (  
Computer brand  
Operating system  
)
Phone (  
Model  
)
Processor  
Speed  
MHz  
RAM  
no  
MB  
Display adapter  
Mouse  
yes  
Other adapters installed  
Brand  
Hard disk capacity  
Instruments used  
MB  
National Instruments hardware product model  
Configuration  
Revision  
National Instruments software product  
Configuration  
Version  
The problem is  
List any error messages  
The following steps will reproduce the problem  
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SC-2043-SG Hardware and Software  
Configuration Form  
Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a  
new copy of this form each time you revise your software or hardware configuration, and use this form as a  
reference for your current configuration. Completing this form accurately before contacting National Instruments  
for technical support helps our applications engineers answer your questions more efficiently.  
National Instruments Products  
•
•
•
•
•
DAQ Hardware Revision  
Interrupt Level of Hardware  
DMA Channels of Hardware  
Base I/O Address of Hardware  
NI-DAQ Version  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Other Products  
•
•
•
•
•
•
•
•
•
•
•
•
•
Computer Make and Model  
Microprocessor  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
_________________________________________________  
Clock Frequency  
Type of Video Board Installed  
Operating System  
Operating System Version  
Operating System Mode  
Programming Language  
Programming Language Version  
Other Boards in System  
Base I/O Address of Other Boards  
DMA Channels of Other Boards  
Interrupt Level of Other Boards  
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Documentation Comment Form  
National Instruments encourages you to comment on the documentation supplied with our products. This  
information helps us provide quality products to meet your needs.  
Title: SC-2043-SG User Manual  
Edition Date:  
Part Number:  
August 1996  
320995B-01  
Please comment on the completeness, clarity, and organization of the manual.  
If you find errors in the manual, please record the page numbers and describe the errors.  
Thank you for your help.  
Name  
Title  
Company  
Address  
Phone  
(
)
Mail to:  
Technical Publications  
Fax to:  
Technical Publications  
National Instruments Corporation  
(512) 794-5678  
National Instruments Corporation  
6504 Bridge Point Parkway,  
Austin, TX 78730-5039  
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Glossary  
___________________________________________________  
Prefix  
Meaning  
Value  
-12  
10  
p-  
n-  
µ-  
m-  
k-  
pico-  
nano-  
micro-  
milli-  
kilo-  
-9  
10  
10  
10  
10  
-6  
-3  
3
6
M-  
mega-  
10  
˚
degrees  
ohms  
+5 V signal  
amperes  
Ω
+5 V  
A
ACH#  
A/D  
AGND  
AIGND  
AISENSE  
AOGND  
C
DAQ board analog input channel number  
analog-to-digital  
analog ground signal  
analog input ground signal  
analog input sense signal  
analog output ground  
Celsius  
CHn±  
DAC  
DAC#OUT  
DAQ  
DC  
DGND  
DIO  
±EX  
±EXn  
EXT  
module positive or negative input channel number  
digital-to-analog converter  
digital-to-analog converter output signal  
data acquisition  
direct current  
digital ground  
digital input-output  
voltage excitation input signals  
positive or negative voltage excitation output channels  
external  
EXTREF  
EXTSTROBE*  
FB  
external reference signal  
external strobe signal  
full bridge  
HB  
half bridge  
Hz  
in.  
hertz  
inches  
INT  
I/O  
internal  
input/output  
LED  
m
light-emitting diode  
meters  
MB  
megabytes  
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Glossary  
NRSE  
ppm  
RAM  
RC  
rms  
RTI  
nonreferenced single-ended  
parts per million  
random-access memory  
resistance-capacitance  
root mean square  
referred to input  
s
seconds  
scan clock signal  
screw terminal  
SCANCLK  
ST  
TCR  
tempco  
V
VI  
VDC  
Vrms  
temperature coefficient  
temperature coefficient  
volts  
virtual instrument  
volts direct current  
volts, root mean square  
SC-2043-SG User Manual  
G-2  
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Index  
Numbers/Symbols  
B
+5 V signal  
Lab/1200 (J9) connector summary  
(table), 3-6  
MIO (J10) connector summary  
(table), 3-5  
block diagram of SC-2043-SG, 4-2  
board configuration. See configuration.  
bridge completion network, 4-3  
breakout screw terminals (J1–J6), 4-4  
power supply, 4-4  
fuses, 4-4  
C
A
cabling options, 2-1  
calibration procedures  
ACH<0..7> signal  
excitation adjustment, 5-1  
external excitation source, 5-1  
onboard excitation source, 5-2  
configuration  
Lab/1200 (J9) connector summary  
(table), 3-6  
MIO (J10) connector summary  
(table), 3-5  
bridge completion selection, 2-7  
half-bridge channels (table), 2-7  
half-bridge jumper settings  
(table), 2-7  
AGND signal  
Lab/1200 (J9) connector summary  
(table), 3-6  
AIGND signal  
quarter-bridge resistors and channels  
(table), 2-8  
MIO (J10) connector summary  
(table), 3-5  
AISENSE signal  
local excitation sense selection  
MIO or MIO E Series boards, 2-5  
jumper settings (table), 2-5  
Lab/1200 Series boards, 2-6  
jumper settings (table), 2-6  
onboard/external excitation  
selection, 2-4  
Lab/1200 (J9) connector summary  
(table), 3-6  
MIO (J10) connector summary  
(table), 3-5  
single-ended analog input, 3-11  
analog input specifications  
amplifier characteristics, A-1  
dynamic characteristics, A-1  
input characteristics, A-1  
stability, A-1  
transfer characteristics, A-1  
analog input connections, 3-7 to 3-9  
sensor connection, 3-7  
full-bridge connection, 3-8  
illustration, 3-8  
jumper settings (table), 2-4  
parts locator diagram, 2-2  
power supply selection, 2-3  
jumper settings (table), 2-3  
connectors Lab/1200 (J9) and MIO (J10)  
overview, 3-1, 4-4  
Lab/1200 (J9) pin assignments  
(table), 3-4  
signal summary (table), 3-6  
MIO (J10) pin assignments (table), 3-2  
signal summary (table), 3-5  
customer communication, xi, B-1  
half-bridge connection, 3-8  
illustration, 3-8  
quarter-bridge connection, 3-9  
illustration, 3-9  
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SC-2043-SG User Manual  
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Index  
D
J
DGND signal  
J9 (Lab/1200) and J10 (MIO) connectors.  
See connectors Lab/1200 (J9) and (J10).  
jumpers and switches. See configuration.  
MIO (J10) connector summary  
(table), 3-5  
Lab/1200 (J9) connector summary  
(table), 3-6  
documentation  
L
conventions used in manual, x  
National Instruments documentation, x  
organization of manual, ix  
LabVIEW and LabWindows/CVI  
application software, 1-2  
related documentation, xi  
M
E
manual. See documentation.  
environment specifications, A-2  
equipment, optional, 1-3  
excitation specifications, A-1  
excitation adjustment, 5-1  
O
external excitation source, 5-1  
onboard excitation source, 5-2  
offset nulling, 3-9, 4-3  
adjustment, 3-9  
table, 3-9  
nulling range adjustment, 3-10  
table, 3-10  
F
operation of SC-2043-SG. See theory  
of operation.  
filtering, 4-4  
fuse, 2-3, 4-4  
P
H
parts locator diagram, 2-2  
physical specifications, A-2  
pin assignments for I/O connectors J9 and  
J10 (table), 3-2, 3-4  
hardware calibration.  
See calibration procedures.  
power-on sequence, 2-8  
power supply  
I
description, 4-4  
fuses, 4-4  
specifications, A-2  
input connectors signal summary (table), 3-4  
input mode selection, 2-7  
installation, 2-1  
cabling options (table), 2-1  
unpacking the SC-2043-SG, 1-4  
instrumentation amplifiers, 4-3  
R
register-level programming, 1-3  
SC-2043-SG User Manual  
I-2  
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Index  
register-level programming, 1-3  
specifications  
analog input  
amplifier characteristics, A-1  
S
dynamic characteristics, A-1  
input characteristics, A-1  
stability, A-1  
SC-2043-SG  
block diagram, 4-2  
features, 1-1  
I/O connectors (J9 and J10)  
(tables), 3-2, 3-4  
optional equipment, 1-3  
screw terminal (J1–J6) description, 3-6  
table, 3-7  
transfer characteristics, A-1  
environment, A-2  
physical, A-2  
power requirements, A-2  
software programming choices  
LabVIEW and LabWindows/CVI  
application software, 1-2  
NI-DAQ driver software, 1-2 to 1-3  
register-level programming, 1-4  
unpacking, 1-4  
T
technical support, B-1  
theory of operation  
amplification, 4-3  
block diagram, 4-2  
bridge completion network, 4-3  
excitation voltage source, 4-4  
filtering, 4-4  
functional overview, 4-1  
offset nulling, 4-3  
what you need to get started, 1-1  
table, 2-4  
signal connections  
analog signal inputs, 3-7 to 3-9  
sensor connection, 3-7  
full-bridge connection, 3-8  
illustration, 3-8  
power supply, 4-6  
half-bridge connection, 3-8  
illustration, 3-8  
quarter-bridge connection, 3-9  
illustration, 3-9  
U
connections exceeding maximum ratings  
(warning), 3-1  
unpacking the SC-2043-SG, 1-4  
I/O connectors J9 and J10 (tables), 3-2  
and 3-4  
offset nulling, 3-9, 4-3  
adjustment, 3-9  
table, 3-9  
nulling range adjustment, 3-10  
table, 3-10  
other connection considerations, 3-11  
output connectors (J9 and J10) signal  
summary (table), 3-5 to 3-6  
screw terminal (J1–J6) description, 3-6  
table, 3-7  
software calibration.  
See calibration procedures.  
software programming choices  
LabVIEW and LabWindows/CVI  
application software, 1-2  
NI-DAQ driver software, 1-2  
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SC-2043-SG User Manual  
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