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© Copyright 1995, 1996 National Instruments Corporation. All Rights Reserved. SC-2043-SG User Manual Eight-Channel Strain Gauge Signal Conditioning Accessory August 1996 Edition Part Number 320995B-0.
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,.
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.
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.
© National Instruments Corporation v SC-2043-SG User Manual Contents About This Manual ............................................................................................................... ix Organization of This Manual ....................
Contents SC-2043-SG User Manual vi © National Instruments Corporation Chapter 4 Theory of Operation .......................................................................................................... 4-1 Functional Overview ...................
Contents © National Instruments Corporation vii SC-2043-SG User Manual Figures Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware ............................................................................. 1-3 Figure 2-1.
© National Instruments Corporation ix SC-2043-SG User Manual 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.
About This Manual SC-2043-SG User Manual x © National Instruments Corporation Conventions Used in This Manual The following conventions are used in this manual: bold italic Bold, italic text denotes a note, caution, or warning. italic Italic text denotes emphasis, a cross reference, or an introduction to a key concept.
About This Manual © National Instruments Corporation xi SC-2043-SG User 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.
© National Instruments Corporation 1-1 SC -2043-SG User Manual 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.
Introduction Chapter 1 SC -2043-SG User Manual 1-2 © National Instruments Corporation 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 .
Chapter 1 Introduction © National Instruments Corporation 1-3 SC -2043-SG User Manual minimal modifications to your code. Figure 1-1 illustrates the relationship between NI-DAQ and LabVIEW and LabWindows/CVI.
Introduction Chapter 1 SC -2043-SG User Manual 1-4 © National Instruments Corporation 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.
© National Instruments Corporation 2-1 SC-2043-SG User Manual 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 and Configuration Chapter 2 SC-2043-SG User Manual 2-2 © National Instruments Corporation 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.
Chapter 2 Installation and Configuration © National Instruments Corporation 2-3 SC-2043-SG User Manual 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.
Installation and Configuration Chapter 2 SC-2043-SG User Manual 2-4 © National Instruments Corporation 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.
Chapter 2 Installation and Configuration © National Instruments Corporation 2-5 SC-2043-SG User Manual Local Excitation Sense Selection MIO or MIO E Series Boards If you are using the SC-2043-SG with.
Installation and Configuration Chapter 2 SC-2043-SG User Manual 2-6 © National Instruments Corporation 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.
Chapter 2 Installation and Configuration © National Instruments Corporation 2-7 SC-2043-SG User Manual Bridge Completion Selection Jumpers W4–W7 and W10–W13 select half-bridge or full-bridge configuration for each channel on the SC-2043 -SG.
Installation and Configuration Chapter 2 SC-2043-SG User Manual 2-8 © National Instruments Corporation 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 -EX n terminals.
© National Instruments Corporation 3-1 SC-2043-SG User Manual Chapter 3 Signal Connections This chapter describes the signal connections to the SC -2043-SG board.
Signal Connections Chapter 3 SC-2043-SG User Manual 3-2 © National Instruments Corporation Table 3-1. Pin Assignments for the MIO I/O Connectors Pin Numbers MIO Connector Signal Names MIO E Series I/.
Chapter 3 Signal Connections © National Instruments Corporation 3-3 SC-2043-SG User Manual Table 3-1. Pin Assignments for the MIO I/O Connectors (Continued) Pin Numbers MIO Connector Signal Names MIO.
Signal Connections Chapter 3 SC-2043-SG User Manual 3-4 © National Instruments Corporation Table 3-2. Pin Assignments for the Lab/1200 I/O Connector Pin Numbers Lab/1200 Connector Signal Names 1 ACH0.
Chapter 3 Signal Connections © National Instruments Corporation 3-5 SC-2043-SG User Manual Table 3-2. Pin Assignments for the Lab/1200 I/O Connector (Continued) Pin Numbers Lab/1200 Connector Signal .
Signal Connections Chapter 3 SC-2043-SG User Manual 3-6 © National Instruments Corporation 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.
Chapter 3 Signal Connections © National Instruments Corporation 3-7 SC-2043-SG User Manual 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.
Signal Connections Chapter 3 SC-2043-SG User Manual 3-8 © National Instruments Corporation 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 +EX n , -EX n , CH n +, and CH n -.
Chapter 3 Signal Connections © National Instruments Corporation 3-9 SC-2043-SG User Manual 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.
Signal Connections Chapter 3 SC-2043-SG User Manual 3-10 © National Instruments Corporation 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.
Chapter 3 Signal Connections © National Instruments Corporation 3-11 SC-2043-SG User Manual For example, assuming: EX = 2.5 V V desired nulling range RTI = ± 1 mV RTI Then, using the above formula, the new nulling resistor should have a value of: R 2.
© National Instruments Corporation 4-1 SC-2043-SG User Manual 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.
Theory of Operation Chapter 4 SC-2043-SG User Manual 4-2 © National Instruments Corporation The block diagram in Figure 4-1 illustrates the key functional components of the SC-2043-SG.
Chapter 4 Theory of Operation © National Instruments Corporation 4-3 SC-2043-SG User Manual Bridge Completion Network The SC-2043 -SG provides onboard bridge completion that you can use with half-bridge and quarter-bridge networks.
Theory of Operation Chapter 4 SC-2043-SG User Manual 4-4 © National Instruments Corporation 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.
© National Instruments Corporation 5-1 SC-2043-SG User Manual 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.
Calibration Procedures Chapter 5 SC-2043-SG User Manual 5-2 © National Instruments Corporation 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.
© National Instruments Corporation A-1 SC-2043-SG User Manual 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 .
Specifications Appendix A SC-2043-SG User Manual A-2 © National Instruments Corporation Bridge type .................................................................. Half or full (jumper-selectable); with sockets for quarter- bridge completion Bridge completion .
© National Instruments Corporation B-1 SC-2043-SG User Manual 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.
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.
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.
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: August 1996 Part Number: 320995B-01 Please comment on the completeness, clarity, and organization of the manual.
© National Instruments Corporation G- 1 SC-2043-SG User Manual Glossary ___________________________________________________ Prefix Meaning Value p- pico- 10 - 12 n- nano- 10 - 9 µ - micro- 10 - 6 m-.
Glossary SC-2043-SG User Manual G-2 © National Instruments Corporation NRSE nonreferenced single-ended ppm parts per million RAM random-access memory RC resistance-capacitance rms root mean square RT.
© National Instruments Corporation I- 1 SC-2043-SG User Manual Index Numbers/Symbols +5 V signal Lab/1200 (J9) connector summary (table), 3-6 MIO (J10) connector summary (table), 3-5 power supply, 4-4 fuses, 4-4 A ACH<0.
Index SC-2043-SG User Manual I- 2 © National Instruments Corporation D DGND signal MIO (J10) connector summary (table), 3-5 Lab/1200 (J9) connector summary (table), 3-6 documentation conventions used.
Index © National Instruments Corporation I- 3 SC-2043-SG User Manual S 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 termin.
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