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National Instruments SC-2043-SG manual

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Table of contents for the manual

  • Page 1

    © 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-01[...]

  • Page 2

    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[...]

  • Page 3

    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 [...]

  • Page 4

    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 pot[...]

  • Page 5

    © National Instruments Corporation v SC-2043-SG User Manual Contents About This Manual ............................................................................................................... ix Organization of This Manual ............................................................................................ ix Conventions Used in Thi[...]

  • Page 6

    Contents SC-2043-SG User Manual vi © National Instruments Corporation Chapter 4 Theory of Operation .......................................................................................................... 4-1 Functional Overview ...................................................................................................... 4-1 Bridge Comp[...]

  • Page 7

    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. SC-2043-SG Parts Locator Diagram ...................................................[...]

  • Page 8

    © 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. The cond[...]

  • Page 9

    About This Manual SC-2043-SG User Manual x © National Instruments Corporation Conventions Used in This Manual The following conventions are used in this manual: bold italic Bold, italic text denotes a note, caution, or warning. italic Italic text denotes emphasis, a cross reference, or an introduction to a key concept. Lab/1200 Lab/1200 refers to [...]

  • Page 10

    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. Consult these guides when you [...]

  • Page 11

    © 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. About the SC-2043-SG The SC-2043 -SG is an eight-channel signal [...]

  • Page 12

    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 . Software Pro[...]

  • Page 13

    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. LabWindows/CVI (PC or  Sun SP ARCstation) LabVIEW  (PC, Macintosh, or  Sun SP ARCstation) Conventional  Programming  Envir[...]

  • Page 14

    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. To avoid such damage in handling the board, take the following precautions: • [...]

  • Page 15

    © 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 Note: You must power off [...]

  • Page 16

    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. 1 2 3 4 5 6 7 8 9 11 14 15 16 17 18 19 20 21 22 23 24 25 27 28 29 30 31 32 33 34 35 36[...]

  • Page 17

    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. Jumper W2 routes either the excitation voltage signal or the channel 0 signal to analog input [...]

  • Page 18

    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. If you want to use an external excitation source, set both jumpers[...]

  • Page 19

    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 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[...]

  • Page 20

    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. The SC[...]

  • Page 21

    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. Setting a jumper in the FB position disconnects the half-bridge completion network from the channel and[...]

  • Page 22

    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. To configure a channel[...]

  • Page 23

    © 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. 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 S[...]

  • Page 24

    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/O Connector Signal Names 1 AIGND AIGND 2 AIGND AIGND 3 ACH0† ACH0† 4 ACH8 ACH8 5 ACH1† ACH1† 6 ACH9 ACH9 7 ACH2† ACH2† 8 ACH10 ACH10 9 ACH[...]

  • Page 25

    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 E Series I/O Connector Signal Names 38 †† TRIG1 39 †† TRIG2 40 EXTCONV* CONVERT* 41 SOURCE1 GPCTR1_SOURCE 42 GATE1 GPCTR1_GATE 43 OUT1 GPCTR1[...]

  • Page 26

    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† 2 ACH1† 3 ACH2† 4 ACH3† 5 ACH4† 6 ACH5† 7 ACH6† 8 ACH7† 9 AISENSE 10 DAC0OUT 11 AGND 12 DAC1OUT 13 DGND 14 PA0 15 PA1 16 PA2 17 PA3 [...]

  • Page 27

    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 Names 38 EXTTRIG 39 EXTUPDATE* 40 EXTCONV* 41 OUTB0 42 GATB0 43 OUTB1 44 GATB1 45 CLKB1 46 OUTB2 47 GATB2 48 CLKB2 49 +5 V† 50 DGND† † These sig[...]

  • Page 28

    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. It is also routed to a screw [...]

  • Page 29

    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. ± EX<0..7> V[...]

  • Page 30

    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 -. The pair of wires connected to +EX n and -EX n provide[...]

  • Page 31

    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. This quarter- bridge completion resistor is equal i[...]

  • Page 32

    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. 2. Read the channel output. 3. While monitoring the output, rotate the trimming potentiometer w[...]

  • Page 33

    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 2.5 V 100 1 mV RTI 250 k null ≈ ±       Ω ≈Ω Other Connection Considerat[...]

  • Page 34

    © 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. Functional Overview The SC-2043 -SG consists of eight channels, each comprising a bridge completion network, a[...]

  • Page 35

    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. External Excitation EX0+ CH0+ CH0- EX0- EX1+ CH1+ CH1- EX1- EX7+ CH7+ CH7- EX7- I/O Screw Terminals +- External Power Onboard/External Power Supply Selecti[...]

  • Page 36

    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. The SC-2043 -SG has a single half-bridge reference that is common to all channels, consisting of a resistive divider [...]

  • Page 37

    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. I/O Connectors and Breakout Screw Terminals The outputs of all eight channels are connected to th[...]

  • Page 38

    © 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 2.5 V ± 0.5%. This circuit has one potentiometer (R2) tha[...]

  • Page 39

    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. 1. If you are using a rack-mount[...]

  • Page 40

    © 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 .................................................... 8 differential Input signal ranges ......[...]

  • Page 41

    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 ....................................................... Two 2.5 k Ω , ± 0.02% ratio[...]

  • Page 42

    © 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. Filling out a copy of the Technical[...]

  • Page 43

    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 m[...]

  • Page 44

    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 bef[...]

  • Page 45

    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.[...]

  • Page 46

    © 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- milli- 10 - 3 k- kilo- 10 3 M- mega- 10 6 ˚ degrees Ω ohms +5 V +5 V signal A amperes ACH# DAQ board analog input channel number A/D analog-to-dig[...]

  • Page 47

    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 RTI referred to input s seconds SCANCLK scan clock signal ST screw terminal TCR temperature coefficient tempco temperature coefficient V volts VI virtua[...]

  • Page 48

    © 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..7> signal Lab/1200 (J9) connector summary (table), 3-6 MIO (J10) connector summary (table), 3-5 AGND signal Lab/1200 (J9) [...]

  • Page 49

    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 in manual, x National Instruments documentation, x organization of manual, ix related documentation, xi E environment specifications, A-2 equipment, [...]

  • Page 50

    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 terminal (J1–J6) description, 3-6 table, 3-7 software programming choices LabVIEW and LabWindows/CVI application software, 1-2 NI-DAQ driver software, 1-2[...]