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National Instruments SC-2043-SG User's Manual

1. Offset wr Nulling Local Excitation Circuit Sense Jumper Half Bridge Completion Jumper Quarter Bridge Completion Resistor User Installed VO 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 4 2 National Instruments Corporation 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 kQ 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 conne
2. National Instruments Corporation A 1 SC 2043 SG User Manual Specifications Appendix A BridBe Pcs silo iaa Half or full Gumper selectable with sockets for quarter bridge completion Bridge completion oooconocncnnonconcnnnconccnncnncnnncnonanonnono Two 2 5 kQ 0 02 ratio tolerance 2 ppm C tracking TCR resistors Offset nulling range ooooocccnnconnnonconanancnnnnanona nana nnncnanonns 5 mV referred to input Power Requirement from DAQ Board 5 VDC 110 Using external excitation 0 ees eseeseeereeneeeees 570 mA Using internal 2 5 V excitation oooconoconccconconcconcnnncnnnno 600 770 mA3 Physical DIMENSIONS ita E 4 6 by 20 1 by 12 4 cm 1 8 by 7 9 by 4 9 in TO connectors IS A sits pete ne Mua pre ebees 72 labeled screw terminals DAQ board connector o oo ee eee cee eee tte ceteeeeeeeees Two 50 pin ribbon cable connectors Environment Operating temperature ccs ete ceeeeeceteeteeeeees 0 to 50 C Storage temperature 0 eee eee eeeeeeeseeeneeseecseeneeeaee 20 to 75 C Relative humidity 0 ceseeeeceeeeeeeeeeeeeeens 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 3 When using internal excitation the power requirement will depend on number and type of strain gauges The maximum power requirement listed 770 mA assumes eight 120 Q full bridge
3. 02 377 1200 01635 523545 O National Instruments Corporation B 1 Fax Number 03 9 879 9179 0662 45 79 90 19 0275703 11 519 622 9311 514 694 4399 457671 11 90 502 2930 148 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 91 640 0533 08 730 43 70 056 20 51 55 02 737 4644 01635 523154 SC 2043 SG User Manual 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 Phone Computer brand Model Processor Operating system Speed MHz RAM MB Display adapter Mouse yes no Other adapters installed Hard disk capacity MB Brand Instruments used National Instruments hardware product model Revision Configuration National Instruments software product Version Configuration The problem is List any error messages The following
4. 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 CHn2 to their excitation return screw terminals EXn National Instruments Corporation 3 7 SC 2043 SG User Manual 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
5. cabling options 2 1 calibration procedures excitation adjustment 5 1 external excitation source 5 1 onboard excitation source 5 2 configuration bridge completion selection 2 7 half bridge channels table 2 7 half bridge jumper settings table 2 7 quarter bridge resistors and channels table 2 8 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 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 El SC 2043 SG User Manual Index 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 optional 1 3 excitation specifications A 1 excitation adjustment 5 1 external excitation source 5 1 onboard excitation source 5 2 F filtering 4 4 fuse 2 3 4 4 H hardware calibration See calibration procedures I input connectors signal summary table
6. 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 VO 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
7. AC noise current return point for the analog circuitry and for the onboard excitation supply It is also routed to a screw terminal 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 lt 8 15 gt 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 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 This pin establishes the DC return path for the onboard excitation supply It is not routed to a screw terminal 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 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 3 5 SC 2043 SG User Manual Signal Connections Chapter 3 Tab
8. 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 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 LO o HB I Half Bridge Completion Jumper Half Bridge Completion Reference Figure 3 2 Half Bridge Connection to the SC 2043 SG SC 2043 SG User Manual 3 8 O National Instruments Corporation 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 v
9. 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 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 applic
10. 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
11. 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
12. 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 yo
13. 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 National Instruments Corporation ix SC 2043 SG User Manual 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 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 func
14. steps will reproduce the problem 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 e Interrupt Level of Hardware DMA Channels of Hardware e Base I O Address of Hardware e NI DAQ Version Other Products e Computer Make and Model e Microprocessor e Clock Frequency e Type of Video Board Installed e Operating System e Operating System Version e Operating System Mode e Programming Language e Programming Language Version e Other Boards in System e Base I O Address of Other Boards DMA Channels of Other Boards e Interrupt Level of Other Boards 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 cla
15. 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 National Instruments Corporation 5 1 SC 2043 SG User Manual 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
16. 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 SC 2043 SG User Manual J J9 Lab 1200 and J10 MIO connectors See connectors Lab 1200 39 and J10 jumpers and switches See configuration L LabVIEW and LabWindows CVI application software 1 2 M manual See documentation O offset nulling 3 9 4 3 adjustment 3 9 table 3 9 nulling range adjustment 3 10 table 3 10 operation of SC 2043 SG See theory of operation P parts locator diagram 2 2 physical specifications A 2 pin assignments for I O connectors J9 and J10 table 3 2 3 4 power on sequence 2 8 power supply description 4 4 fuses 4 4 specifications A 2 R register level programming 1 3 O National Instruments Corporation S SC 2043 SG block diagram 4 2 features 1 1 VO 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 to 1 3 register level programming 1 4 unpacking 1 4 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 half bridge connection 3 8 illustration 3 8 quarter bridge connection 3 9 illustration 3 9 connections excee
17. CHO Table 2 5 Local Excitation Sense Jumper Settings for Lab 1200 Series Boards CHO position Place the jumper in this position to route the conditioned strain gauge bridge signal that entered via the CHO screw terminals to ACHO factory setting EX position Place the jumper in this position to route the excitation source voltage to ACHO EX position NEVER leave the jumper in this position factory setting ST position Always keep the jumper in this position to route the DACIOUT analog output signal from the Lab 1200 board to a screw terminal SC 2043 SG User Manual 2 6 National Instruments Corporation 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 Hal
18. G User Manual Signal Connections Chapter 3 Table 3 1 Pin Assignments for the MIO I O Connectors Names Signal Names continues SC 2043 SG User Manual 3 2 National Instruments Corporation Chapter 3 Signal Connections Table 3 1 Pin Assignments for the MIO I O Connectors Continued Names Signal Names T 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 tt 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 National Instruments Corporation 3 3 SC 2043 SG User Manual Signal Connections Chapter 3 Table 3 2 Pin Assignments for the Lab 1200 I O Connector Signal Names continues SC 2043 SG User Manual 3 4 National Instruments Corporation Chapter 3 Signal Connections Table 3 2 Pin Assignments for the Lab 1200 I O Connector Continued Signal Names t 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 Signal Name Pin Number AISENSE ACH lt 0 7 gt 3 5 7 9 11 13 15 17 Others Others O National Instruments Corporation MIO 310 VO Connectors Signal Summary Description Analog Input Ground This pin provides the
19. 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 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 Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Italy 02 48301892 Japan 03 5472 2970 Korea 02 596 7456 Mexico 95 800 010 0793 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 Taiwan 02 377 1200 U K 01635 523545 Limited Warranty The SC 2043 SG is warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping
20. VDC Vrms SC 2043 SG User Manual nonreferenced single ended parts per million random access memory resistance capacitance root mean square referred to input seconds scan clock signal screw terminal temperature coefficient temperature coefficient volts virtual instrument volts direct current volts root mean square G 2 National Instruments Corporation 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 lt 0 7 gt signal Lab 1200 J9 connector summary table 3 6 MIO J10 connector summary table 3 5 AGND signal Lab 1200 J9 connector summary table 3 6 AIGND signal MIO 310 connector summary table 3 5 AISENSE signal Lab 1200 J9 connector summary table 3 6 MIO 310 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 half bridge connection 3 8 illustration 3 8 quarter bridge connection 3 9 illustration 3 9 National Instruments Corporation B block diagram of SC 2043 SG 4 2 board configuration See configuration bridge completion network 4 3 breakout screw terminals J1 J6 4 4 C
21. age 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 National Instruments Corporation 3 1 SC 2043 S
22. ally 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 R6850 or SH6850 MIO J10 boards 50 pin MIO boards NB1 MIO J10 100 pin MIO boards3 R1005050 MIO J10 Lab PC DAQPad 1200 NB1 Lab 1200 J9 DAQCard 1200 PR50 50F Lab 1200 J9 1 To install the SC 2043 SG with any of these boards refer to the installation guide of the cable kit for instructions 2 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 lt 0 15 gt 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 Confi
23. alue 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 FBIS x10 HB Half Bridge Bri Quarter Bridge Completion en Completion Resistor Jumper Retarenes 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 Trimming Potentiometer National Instruments Corporation 3 9 SC 2043 SG User Manual Signal Connections Chapter 3 To null the static voltage offset of the system in
24. ation designer Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel and all traditional medical safeguards equipment and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used National Instruments products are NOT intended to be a substitute for any form of established process procedure or equipment used to monitor or safeguard human health and safety in medical or clinical treatment Contents About This Manualen keenean e e ix Organization of This Manual ui ia ix Conventions Used in This Manual is x National Instruments Documentation eccceeeseceeseceeaeeceeneeceeneeceeneeceneecseeeecneeeeeneeeees x Related Documento ono ocn xi Customer Communication e sienn a a is xi Chapter 1 A A A e a a al 1 1 About the SC 20435 SG iia 1 1 What You Necd to Get Started sonra e n e R e aa 1 1 Software Programming Choices ac A 1 2 LabVIEW and LabWindows CVI Application Software cooooccinocccinocccinancnnnnos 1 2 NI DAQ Driver Software i E RE ET EE RG 1 2 Register Level Programming a oa iria trenes 1 3 Optional Equipment ol ee eel adie aaa ee ealetee eon 1 3 Malang Ae A a NO 1 4 Chapter 2 Installation and Configurati0W oooccdiccicicicicnnnnnnnnnnnocononorononononononorononoronororororonorono
25. cluding 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 RTD 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 The value of all the nulling resistors on the SC 2043 SG is 47 kQ 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 pull EX RTI desired nulling range where Ru is the nulling resistor value EX is the excitation voltage factory adjusted to 2 5 V Vd
26. cted 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 c
27. ding maximum ratings warning 3 1 VO 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 National Instruments Corporation I 3 Index register level programming 1 3 specifications analog input amplifier characteristics A 1 dynamic characteristics A 1 input characteristics A 1 stability A 1 transfer characteristics A 1 environment A 2 physical A 2 power requirements A 2 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 power supply 4 6 U unpacking the SC 2043 SG 1 4 SC 2043 SG User Manual
28. esired nulling range RTI is the desired nulling range referred to input SC 2043 SG User Manual 3 10 National Instruments Corporation Chapter 3 Signal Connections 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 100 Beg 25 y a E mV am 250 kQ 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 National Instruments Corporation 3 11 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 an instrumentation amplifier with a gain of 10 offset nulling filtering and screw terminal connections to accommodate strain gauge bridge meas
29. f Bridge Completion Jumper Settings FB position Use this setting to select full bridge completion factory setting PN W13 W12 HB position Use this setting to select half bridge completion Channel O National Instruments Corporation 2 7 SC 2043 SG User Manual 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 SC 2043 SG User Manual 2 8 National Instruments Corporation Chapter 3 Signal Connections This chapter describes the signal connections to the SC 2043 SG board T 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 dam
30. fset Nulles 4 3 A tte cea enter wide sana E a va ona ate e a pes damn eRe Rea eae 4 4 VO Connectors and Breakout Screw Terminals oooncccnnncccnoncccnonccononcnonnncnononcnnnnnccnnnnnos 4 4 Excitation Voltage SOURCE ostia o era ae aean T ES EER E SES aS 4 4 E 4 4 Chapter 5 Calibration Procedures ceca eA at cet teeth ede sake 5 1 Excitation Adjustment ibi ti 5 1 Onboard EXCITA SOURCE A A Oe 5 1 External Excitation SOLES ns 5 2 Appendix A Specifications e os A 1 Appendix B Customer COMMUNICA ION oooncicnicicicicioninooconononononononnonon cono co nono B 1 A A A eatoni te ii G 1 Eao CS EE BSH RATS EAST DAI AA NIE 1 1 SC 2043 SG User Manual vi O National Instruments Corporation Contents Figures Figure 1 1 The Relationship between the Programming Environment NI DAQ dnd Your Hate ware ui ii 1 3 Figure 2 1 SC 2043 SG Parts Locator Diagram ooooonnncccnnocccnoncncnoncnononcnononcnonnnncononcnnnnnccnnnnoss 2 2 Figure 3 1 Full Bridge Connection to the SC 2043 SG cee eeecccceseceeseeeeceteeeeseeeeesteeeeaees 3 8 Figure 3 2 Half Bridge Connection to the SC 2043 SG occ eeeccecsenceeseeeeceneeeeeeeeeenteeeeaees 3 8 Figure 3 3 Quarter Bridge Connection to the SC 2043 SG occ eeecceeeseeeceteeeesteeeesneeeenaees 3 9 Figure 4 1 SC 2043 SG Block Diagram a 4 2 Tables Table 2 1 Installation and Cabling Options for the SC 2043 SG cooooococnnccccconnconancnonnnccnnnnoss 2 1 Table 2 2 Power Supply Selection sie czcesszesvase
31. guration Note You must configure your DAQ board analog channels for NRSE nonreferenced single ended inputs for use with the SC 2043 SG National Instruments Corporation 2 1 SC 2043 SG User Manual 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 l MIGILAB 120 jaMIOLAB 120 40 38 50 48 a 39 37 49 47 MIO al 30 30 29 29 28 28 27 27 26 26 38 36 48 46 37 ao 47 45 36 34 46 44 29 25 35 33 24 13 45 43 23 23 44 42 22 22 32 32 43 41 31 24 12 3 ojo CH7 CH7 ro O O O oLOLorafo o ol o o EX al ICNENE RERENNENE ENE ENEE CE NENNSENE ENE RERSENNE NE RE RENE il i LAMAMA slasla st asla ses a sa sa aa a SL LS SL LS LS LS I Ss a Ss CSMA SS S S ee ee ee ee el Ll molololoolo olololololoololo
32. inputs The minimum power requirement listed 600 mA assumes one 350 Q half bridge input SC 2043 SG User Manual A 2 National Instruments Corporation 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 Branch Offices Australia Austria Belgium Canada Ontario Canada Quebec Denmark Finland France Germany Hong Kong Italy Japan Korea Mexico Netherlands Norway Singapore Spain Sweden Switzerland Taiwan U K 512 794 5678 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 2265886 91 640 0085 08 730 49 70 056 20 51 51
33. ion 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 lt 0 7 gt 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 ACHO leaving you ACH lt 1 7 gt for conditioned strain gauge signal inputs Setting jumper W2 to the CHO position the factory setting routes the conditioned strain gauge bridge signal that entered via the CHO screw terminals to ACHO Table 2 4 Local Excitation Sense Jumper Settings for MIO and MIO E Series Boards l CHO position Place the jumper in this position to route the conditioned strain gauge bridge signal that entered via the CHO screw terminals to ACHO factory setting EX position Place the jumper in this position to route the excitation source voltage to ACHO EX position Place the jumper in this position to route the excitation source voltage to ACH8 fact
34. ircuitry 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 4 3 SC 2043 SG User Manual 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 lt 0 7 gt 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 con
35. ise noted Analog Input Input Characteristics Number of channels Input signal ranges 0 eee eeeeeseceeeceeeecesseceeeeeeeeeneeeeee Max working voltage signal common mode Overvoltage protection oooocnnonnccnonononconncancnnncnnonacinncnnos Inputs protected Transfer Characteristics Nonlinearity enining ao a E GAIN EITOR EASE E E ASET Amplifier Characteristics Input impedance Normal powered on Powered off or overload Input bias curr nt seccina Input offset CUITENE sencer i CMRR OUtPUt Tange sc iccscecscsastispseisdscesssatidsvapssssstvebsestesdscbetness Dynamic Characteristics Bandwidth System noise Stability Recommended warm up time Offset temperature coefficient eect eee Gain temperature Coefficient eles eeseeeeeeeees Excitation Channels Tee Ve EAE A evs cescd ieee AO ET Current drive nc Bochco UM chat DA A E E NN O EENE EAT 8 differential 1 V fixed gain of 10 on each channel Each input should remain within 11 V of ground 45 V powered on 30 V powered off CH lt 0 7 gt t 0 01 FSR 0 15 of reading max 10 GQ 5 2 KQ 2 5 nA 1 5 nA 93 dB min 11 V 1 6 kHz single pole RC filter 5 Vrms referred to input 10 minutes 3 5 uV C referred to input 10 ppm C 1 connected to 8 screw terminal pairs 2 5 V 0 5 adjustable from 1 5 to 2 5 V 167 mA at 2 5 V 480 ppm C l Excitation current drive assumes eight full bridge 120 Q strain gauges
36. le 3 4 Lab 1200 J9 I O Connector Signal Summary Signal Name Pin Number Description 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 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 lt 0 7 gt 1 8 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 tThis 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 This pin establishes the DC return path for the onboard excitation supply It is not routed to a screw terminal 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
37. lo o ololo o 0 0 o Ll slolooloolololololoo 0lo ololololo o oloo olo Ll molololooloolololololololololo o ololo o 0 o o O O Screen Printed Screw Product Name and R37 Terminal Label Assembly Number W12 J1 Sw1 R51 J3 R9 R54 R55 J9 W13 J10 R65 F3 R69 R23 Serial Number R17 wg R19 R18 W11 R30 R33 R34 R35 R50 OANDORWPD Figure 2 1 SC 2043 SG Parts Locator Diagram SC 2043 SG User Manual 2 2 National Instruments Corporation 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 c
38. nd 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 J SC 2043 SG board LJ SC 2043 SG User Manual J SC 2043 SG screw terminal labels LL 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 National Instruments Corporation 1 1 SC 2043 SG User Manual Introduction Chapter 1 J One of the following SH6850
39. nectors 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 tEX lt 0 7 gt 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 tEX lt 0 7 gt 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 ACHO or ACH8 of the MIO board or to ACHO 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 input
40. ngle or double height rack mount kit with metal wraparound cover e 120 Q 0 1 10 ppm C quarter bridge completion resistors eight per package e 350 Q 0 1 10 ppm C quarter bridge completion resistors eight per package National Instruments Corporation 1 3 SC 2043 SG User Manual 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 1 4 National Instruments Corporation 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 extern
41. noos 2 1 NS 2 1 A S aE SNTE 2 1 POW ST Supply Selecion Sasi ad cda 2 3 Onboard External Excitation Selection ooonnnocccnonccconnncononccononccnnnnncnnnnccnnnnccnnnos 2 4 Local Excitation Sense Selection si ccsisisegesccaceasiesasedeeasaseecseessnscecsnanevssne bensabensens 2 5 MIO or MIO E Series Boards eiii a bdo adan 2 5 Lab 1200 Series Board socorrista a n 2 6 Bridge Completion Selecionar atorado tes 2 7 Chapter 3 Signal Connections lt 3 1 10 Connector Pim Des Crinum aeeoeia a a a a a iE 3 1 Screw Terminal Description o sctesdiccaseseasiennidaccvanaiacesdeglarsaousedaavenecceds iisi iii 3 6 Analog Mp t CONNECH OMS csset eseeto niis 3 7 Sensor Connection to the SC 2043 SG ssesssessssssesseessressessseresseesssees 3 7 Full Bridge COn OM ici aaa citas adidas 3 8 Half Bridge COMEN ds 3 8 Quarter Bridge Connection oooooccconcconnnonnnononcconcnananona nono nccnnncnnnss 3 9 a A ae A es ausens saa cas acad E E au secs E EEE 3 9 Offset Nulling Adjustment ia a A E 3 9 Nulline Range Adjustment aid tetas es cos oeauth cde cto Cazante usecase deat iat eae lay 3 10 Other Connection Considerations mao 3 11 National Instruments Corporation v SC 2043 SG User Manual Contents Chapter 4 Theory of Operation 2 55220 A ae de utes 4 1 F nctonal OVER VICW ds ados sus dave o a anes 4 Bridge Completion Network iis t cicaeasssecaieea aria Noria edilicia 4 3 PRTP GC AUGM sagnene euansegusadteeed Bas waives e iaae ar g EES 4 3 Of
42. nte esne i aies 2 3 Table 2 3 Onboard External Excitation Jumpers 0 0 0 ccceesceeeseeeeeeeeeeeeeeeceeeeeesteeeeneeeeaees 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 ooocccnnococnoncccnoncnonnnnnononaconnnccnonnccnnnnnos 2 7 Table 2 7 Half Bridge Completion Jumpers and Corresponding Channels 006 2 7 Table 2 8 Quarter Bridge Completion Resistors and Corresponding Channels 2 8 Table 3 1 Pin Assignments for the MIO W O Connectors coooonnocononononnnonanonancnoncnnnncnnn ccoo ccoo 3 2 Table 3 2 Pin Assignments for the Lab 1200 I O Connector oooonoccnnocononnconncnoncnannninnncnnncnnos 3 4 Table 3 3 MIO J10 I O Connectors Signal Summary 0 cee eeeeeesseeeeeeeeeceteeeenteeeeaees 3 5 Table 3 4 Lab 1200 39 Signal Summary cee cece ceesecesececeseeeceeeeecseeeeceeeecseeeeneeeenaees 3 6 Table 3 5 Screw Terminals J1 J6 Signal Summary 200 0 eee eeeceeeceeeeeeeceeeeeceeeeeenteeeeaees 3 7 Table 3 6 Offset Nulling Adjust Potentiometer and Corresponding Channel 3 9 Table 3 7 Nulling Resistor and Corresponding Channel ooooccnnnnconnnncccoonnnononcconancnoonaccnannnss 3 10 National Instruments Corporation vii SC 2043 SG User Manual About This Manual This manual describe
43. ory setting ST position Place the jumper in this position to route an external input signal to ACH8 National Instruments Corporation 2 5 SC 2043 SG User Manual 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 ACHO 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 WS is the EX position you MUST set jumper WS 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 ACHO leaving you ACH lt 1 7 gt for strain gauge signal measurement Setting jumper W2 to the CHO position the factory setting routes the conditioned strain gauge bridge signal that entered via the CHO screw terminals to A
44. rity 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 National Instruments Corporation 6504 Bridge Point Parkway 512 794 5678 Austin TX 78730 5039 Glossary o Q 5 V A ACH A D AGND AIGND AISENSE AOGND C CHn DAC DAC OUT DAQ DC DGND DIO EX EXn EXT EXTREF EXTSTROBE FB HB Hz in INT VO LED m MB National Instruments Corporation rs ei vate degrees ohms 5 V signal amperes DAQ board analog input channel number analog to digital analog ground signal analog input ground signal analog input sense signal analog output ground Celsius 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 external reference signal external strobe signal full bridge half bridge hertz inches internal input output light emitting diode meters megabytes SC 2043 SG User Manual Glossary NRSE ppm RAM RC rms RTI S SCANCLK ST TCR tempco V VI
45. s 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 Fl 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 4 4 O National Instruments Corporation 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
46. s 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
47. 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 1 2 National Instruments Corporation Chapter 1 Introduction minimal modifications to your code Figure 1 1 illustrates the relationship between NI DAQ and LabVIEW and LabWindows CVI Conventional Programming LabVIEW LabWindows CVI Environment PC Macintosh or PC or PC Macintosh or Sun SPARCstation Sun SPARCstation Sun SPARCstation NY 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 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 e Single or double height rack mount kit with acrylic plastic cover e Si
48. tions 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 e 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 e 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 x National Instruments Corporation About This Manual e 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 physicall
49. u match the sticker label signal numbers to the Lab 1200 silkscreened signal numbers on the board SC 2043 SG User Manual 3 6 National Instruments Corporation 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 lt 0 7 gt Input Channels These inputs are the input signals for analog channels O through 7 EX lt 0 7 gt 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 lt 0 7 gt 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 lt 0 7 gt excitation output screw terminals Note The EX input signal is connected to DGND on the SC 2043 SG
50. urements 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 e Bridge completion network e Amplification e Offset nulling e Filtering e MIO and Lab 1200 I O connectors and breakout screw terminals e Excitation voltage source e Power supply The remainder of this chapter describes the theory of operation for each of these components National Instruments Corporation 4 1 SC 2043 SG User Manual Theory of Operation Chapter 4 The block diagram in Figure 4 1 illustrates the key functional components of the SC 2043 SG ernal Excitation External Power 5V Gnd Onboard External Scent Internal Bower Onboard External umpers 2 5 V Power Supply Excitation Converter Selection Switch Half Bridge Completion Reference Lowpass Filter Buffered Local Excitation Sense Jumper Half Bridge Niles ACH Completion Paes Circuit Jumper DAC10UT Lowpass Filter ES Buffered Offset Nulling Circuit p1e0g Salas 00Z 1 08 104 JOJ03UUOD O Uld 0G pieog Sevag 3 OIN 10 OIN 40 1093UU09 O I Uld 0S Lowpass Filter Buffered
51. urrent to 1 Aat 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 A INT position Use this setting to configure the SC 2043 SG to draw power through the DAQ board factory setting EXT position Use this setting to draw 5 V power from an external supply connected to connector J8 O National Instruments Corporation 2 3 SC 2043 SG User Manual 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 INT position Place jumpers W1 and W3 in this position to provide excitation voltage from the onboard excitation source factory setting EXT position Place jumpers W1 and W3 in this position to provide excitation voltage from an external excitation source connected to connector J7 SC 2043 SG User Manual 2 4 National Instruments Corporation Chapter 2 Installation and Configuration Local Excitation Sense Select
52. y 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 e 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 National Instruments Corporation xi 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 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 a
53. you MUST set jumper WS 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 5 2 National Instruments Corporation Appendix A Specifications This appendix lists the specifications for the SC 2043 SG These are typical at 25 C unless otherw

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