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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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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, N
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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 eq
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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 Nati
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Contents About This Manual ix ............................................................................................................... Organization of This Manual ix ............................................................................................ Conventions Used in This Manual x ...............................................................
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Contents Chapter 4 4-1 .......................................................................................................... Theory of Operation Functional Overview 4-1 ...................................................................................................... Bridge Completion Network 4-3 .......................................................................................... Amplification 4-3 ...................................................................................
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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 .....................
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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-
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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 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 unle
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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 Inst
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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
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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 La
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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
LabVIEW
LabWindows/CVI
Programming
(PC, Macintosh, or
(PC or
Environment
Sun SPARCstation) Sun SPARCstation) (PC, Macintosh, or
Sun SPARCstation)
NI-DAQ
Driver Software Personal
DAQ or
Computer
SCXI Hardware or
Workstation Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hard
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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.
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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 mak
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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. 5 7 1 14 11 2 3 4 6 8 9 10 12 13 15 16 17 18 19 20 21 22 23 24 25
26
27 28 29 30 31 32 33 34 36 55 54 53 35 52 43 37 51 44 38 45 50 39
49 46 40 48 41 47 42 1 Screen Printed Screw 14 Product Name and 27 R37 41 R53 Terminal Label Assembly Number 28 W12 42 R62 2 J1 15 SW1 29 R51 43 R68 3 J3 16 R9
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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 o
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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 INT position—Place jumpers W1 J7 EXT and
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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
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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 S
