Related Manuals for National Instruments SCXI -1124
Summary of Contents for National Instruments SCXI -1124
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Page 1: User Manual
SCXI -1124 User Manual Six-Channel Isolated Digital-to-Analog Converter Module September 1999 Edition Part Number 320712B-01 © Copyright 1994, 1999 National Instruments Corporation. All Rights Reserved. - Page 2 Worldwide Technical Support and Product Information www.natinst.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 794 0100 Worldwide Offices Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 284 5011, Canada (Calgary) 403 274 9391, Canada (Ontario) 905 785 0085, Canada (Québec) 514 694 8521, China 0755 3904939, Denmark 45 76 26 00,...
- Page 3 A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty.
- Page 4 WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS (1) NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN.
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Page 5: Table Of Contents
Contents ___________________________________________________ About This Manual ......................vii Organization of This Manual ..................vii Conventions Used in This Manual ................viii The National Instruments Documentation Set ............. ix Related Documentation ....................ix Customer Communication ................... x Chapter 1 Introduction ........................1-1 What Your Kit Should Contain.................. - Page 6 Table 2-1. Module Configuration of Your Chassis System ............ 2-2 Table 2-2. Module Configuration of Your DAQ Board ............2-2 Table 3-1. SCXIbus to SCXI-1124 Rear Signal Connector to DAQ Board ......3-11 Table 4-1. Typical DAC Channel Ranges ................4-3 © National Instruments Corporation SCXI-1124 User Manual...
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Page 7: About This Manual
This manual describes the electrical and mechanical aspects of the SCXI-1124 and contains information concerning its installation and operation. The SCXI-1124 is one of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series modules. The SCXI-1124 provides six channels of voltage or current output. -
Page 8: Conventions Used In This Manual
MC-DIO-32F, NB-DIO-24, NB-DIO-32F, NB-DIO-96, PC-DIO-24, and PC-DIO-96 digital I/O data acquisition boards unless otherwise noted. DIO-type board DIO-type board refers to National Instruments data acquisition boards that have only digital inputs and outputs. These boards include the DIO-24, DIO-32F, and DIO-96 boards unless otherwise noted. -
Page 9: The National Instruments Documentation Set
The following National Instruments manual contains detailed information for the register-level programmer: • SCXI-1124 Register-Level Programmer Manual (part number 340694-01) This manual is available from National Instruments by request. If you are using NI-DAQ, ® LabVIEW, or LabWindows , you should not need the register-level programmer manual. Using NI-DAQ, LabVIEW, or LabWindows is quicker and easier than and as flexible as using the low- level programming described in the register-level programmer manual. -
Page 10: Customer Communication
About This 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. -
Page 11: Chapter 1 Introduction
182346-01 SCXI-1124 User Manual 320712-01 If your kit is missing any of the components, contact National Instruments. Detailed SCXI-1124 specifications are in Appendix A, Specifications. Software Programming Choices There are four options to choose from when programming your National Instruments plug-in data acquisition board and SCXI hardware. -
Page 12: Ni-Daq Driver Software
776800-01 NI-DAQ Driver Software The NI-DAQ driver software is included at no charge with all National Instruments data acquisition boards. 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... -
Page 13: Register-Level Programming
Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware The National Instruments PC, AT, and MC Series data acquisition boards are packaged with NI-DAQ software for PC compatibles. NI-DAQ software for PC compatibles comes with language interfaces for Professional BASIC, Turbo Pascal, Turbo C, Turbo C++, Borland C++, and Microsoft C for DOS;... -
Page 14: Optional Equipment
If you want to obtain the register-level programmer manual, please fill out the Register-Level Programmer Manual Request Form at the end of this manual and send it to National Instruments. Optional Equipment... -
Page 15: Custom Cables
Remove the module from the package and inspect the module for loose components or any other sign of damage. Notify National Instruments if the module appears damaged in any way. Do not install a damaged module into your SCXI chassis. -
Page 16: Configuration And Installation
This chapter describes the SCXI-1124 jumper configurations, installation of the SCXI-1124 into the SCXI chassis, and cable wiring. Module Configuration The SCXI-1124 includes four jumpers that are shown in the parts locator diagram, Figure 2-1. Figure 2-1. SCXI-1124 Parts Locator Diagram © National Instruments Corporation SCXI-1124 User Manual... -
Page 17: Table 2-1. Module Configuration Of Your Chassis System
If you want to connect the to a DIO-type board, place all three SCXI-1124 to an MIO-type jumpers in the D position (factory board, place all three jumpers in setting). the M position. SCXI-1124 User Manual © National Instruments Corporation... -
Page 18: Supplementary Jumper Configuration Information
Jumpers W2, W3, W4 have labels indicating the DIO and the MIO configurations (D and M are printed on the module). DIO-type boards are National Instruments boards that have only digital inputs and outputs. These boards include the DIO-24, DIO-32F, and DIO-96. - Page 19 If you are using LabWindows, the software installation instructions are in Part 1, Introduction to LabWindows, of the Getting Started with LabWindows manual. After you have installed LabWindows, refer to Chapter 1, Configuring LabWindows, of the LabWindows User Manual for software configuration instructions. SCXI-1124 User Manual © National Instruments Corporation...
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Page 20: Chapter 3 Signal Connections
If the module is damaged, turn the module off and do not use until service-trained personnel can check its safety. If necessary, return the device to National Instruments for service and repair to ensure that its safety is not compromised. - Page 21 To connect the safety earth ground to the safety ground solder lug, run an earth ground wire in the cable from the signal source to the terminal block. National Instruments is liable for any damages or injuries resulting from inadequate safety earth ground connections.
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Page 22: Front Connector
VOUT 2 ISINK 3 SUPPLY 3 GND 3 VOUT 3 ISINK 4 SUPPLY 4 GND 4 VOUT 4 ISINK 5 SUPPLY 5 GND 5 VOUT 5 CHASSIS Figure 3-1. SCXI-1124 Front Connector Pin Assignments © National Instruments Corporation SCXI-1124 User Manual... -
Page 23: Front Connector Signal Descriptions
The large dots in the figures indicate where you connect wires to the SCXI-1325 terminal block. For information on how to connect the wires to your terminal block, consult the SCXI-1325 High-Voltage Terminal Block Installation Guide. SCXI-1124 User Manual © National Instruments Corporation... -
Page 24: Figure 3-2. Dac Channel Connection As Voltage Output
Figure 3-3 shows how to connect a DAC channel as a current output using the channel loop supply. SCXI-1124 SCXI-1124 SUPPLY SUPPLY 0-20 mA 0-20 mA load load ISINK ISINK High Load with high common-mode voltage Floating load Figure 3-3. DAC Channel Connection as Current Output, Internal Loop Supply © National Instruments Corporation SCXI-1124 User Manual... -
Page 25: Figure 3-4. Dac Channel Connection As Current Output, External Loop Supply
If both your supply and load are grounded, you must connect your signals as shown in Figure 3-5a. The circuit in Figure 3-5b does not work. SCXI-1124 User Manual © National Instruments Corporation... -
Page 26: Chassis Ground Connections
Rear Signal Connector Note: If you are using the SCXI-1124 with a National Instruments DAQ board and cable assembly, you do not need to read the remainder of this chapter. If you are also using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1124, read this section. -
Page 27: Rear Signal Connector Signal Descriptions
Digital Ground–Supplies the reference for DAQ board digital signals and is tied to the module digital ground. Pin 50 is for DIO-type boards. Pin 24 is for MIO-type boards. Jumper W4 selects the pin. SCXI-1124 User Manual © National Instruments Corporation... -
Page 28: Digital I/O Signal Connections
M position. Pin 50 is for DIO-type boards when SCXI-1124 jumpers W2, W3, and W4 are in the D position. • Pin 25, SERDATIN, is equivalent to the SCXIbus MOSI serial data input line. © National Instruments Corporation SCXI-1124 User Manual... - Page 29 SCXI-1124 with an SCXI-1348 cable assembly, the SCXI-1124 signals match the digital lines of the DIO-32F board. Table 3-1 lists the pin equivalences. For more information, consult your cable assembly installation guide. SCXI-1124 User Manual 3-10 © National Instruments Corporation...
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Page 30: Table 3-1. Scxibus To Scxi-1124 Rear Signal Connector To Daq Board
2 V minimum input logic low voltage 0.8 V maximum ±100 µA maximum input current leakage • Digital output specifications (referenced to DIGGND): output logic low voltage 0.4 V maximum at 4 mA maximum © National Instruments Corporation 3-11 SCXI-1124 User Manual... -
Page 31: Theory Of Operation
15 - 21 V – Output Chassis Ground Range Unipolar/ Channel 5 Optical Buffer Selection Bipolar 12-Bit DAC Isolation (1, 5, or 10 V) Selection Isolated Ground Chassis Ground Figure 4-1. SCXI-1124 Block Diagram © National Instruments Corporation SCXI-1124 User Manual... -
Page 32: Rear Signal Connector, Scxibus Connector, And Scxibus Interface
These constants are used in a linear interpolation algorithm to determine the bit pattern to write to a DAC channel when a particular voltage or current is desired. For more information on the EEPROM and calibration, see Chapter 5, Calibration. SCXI-1124 User Manual © National Instruments Corporation... -
Page 33: Analog Output Circuitry
In addition, there can be gain and offset errors in the voltage output circuitry. To account for these errors, there are calibration constants stored in the EEPROM for each channel range. These constants encode the values you write to the DAC to get the two endpoints for the nominal © National Instruments Corporation SCXI-1124 User Manual... -
Page 34: Noise Reduction
= voltage you want = necessary bit pattern to write If you are using National Instruments software, the reading of constants from the EEPROM and calculation of bit patterns is done for you automatically. If you are writing your own software, see the SCXI-1124 Register-Level Programmer Manual for information on how to read the EEPROM and decode the offset information. -
Page 35: Changing Ranges
EEPROM for each channel current range. These constants encode the values that need to be written to the DAC to get zero and 20 mA. © National Instruments Corporation SCXI-1124 User Manual... -
Page 36: Figure 4-3. Loop Supply
= current you want = necessary bit pattern to write If you are using National Instruments software, the reading of constants from the EEPROM and calculation of bit patterns is done for you automatically. If you are writing your own software, see the SCXI-1124 Register-Level Programmer Manual for information on how to read the EEPROM and decode the offset information. -
Page 37: Chapter 5 Calibration
= high value of the range (+1 V, +5 V, +10 V or 20 mA) = output you want = necessary bit pattern you write to get O (rounded to the nearest integer) © National Instruments Corporation SCXI-1124 User Manual... -
Page 38: Calibration Methods
(1 V, 5 V, 10 V, or 20 mA), and B is the necessary bit pattern you write (rounded to the nearest integer) to get O SCXI-1124 User Manual © National Instruments Corporation... -
Page 39: Voltage Calibration Method
B as real numbers. However, when storing the constants to the EEPROM, the values must be rounded to the nearest integer. • INL error–This adds another 0.5 LSB of error to the output. © National Instruments Corporation SCXI-1124 User Manual... -
Page 40: Current Calibration Method
The EEPROM has a limited amount of storage space. Therefore, there is a limited range of values for B and B that can be coded into the EEPROM. Valid values for B and B are: 0 ≤ B ≤ 255 and 3,840 ≤ B ≤ 4,095 SCXI-1124 User Manual © National Instruments Corporation... -
Page 41: Measurement Technique
If you use a DAQ board that does not use an integrating ADC, you should average a few hundred readings. Remember that any errors from your calibration measurements must be added to the error described in the calibration sections. © National Instruments Corporation SCXI-1124 User Manual... -
Page 42: Appendix A Specifications
Protection Short circuit and open circuit 0 µA Power-on state Update rate depends on the computer and software you use. These tests were done using a 50 MHz 80486 DX/2 computer running LabWindows. © National Instruments Corporation SCXI-1124 User Manual... -
Page 43: Physical
< 2000 meters Safety Electrical Measuring IEC/EN 61010-1, UL 3111-1, and Test Equipment CAN/CSA C22.2, No. 1010.1 Installation category Category II Pollution degree Settling time is to ±0.012% (±0.5 LSB) accuracy for a full-scale step. SCXI-1124 User Manual © National Instruments Corporation... -
Page 44: Appendix B Customer Communication
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. - Page 45 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.
- Page 46 Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
- Page 47 Register-Level Programmer Manual Request Form National Instruments offers a register-level programmer manual at no charge to customers who are not using National Instruments software. Title: SCXI-1124 Register-Level Programmer Manual Part Number: 340694-01 Please indicate your reasons for obtaining the register-level programmer manual. Check all that apply.
- Page 48 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: SCXI-1124 User Manual Edition Date: September 1999 Part Number: 320694B-01 Please comment on the completeness, clarity, and organization of the manual.
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Page 49: Glossary
DIGGND Digital Ground signal Deutsche Industrie Norme Digital Input/Output signal direct memory access differential nonlinearity EEPROM electrically erased programmable read-only memory EXTSTROBE* External Strobe signal Farads FIFO first-in-first-out feet © National Instruments Corporation Glossary-1 SCXI-1124 User Manual... - Page 50 Voltage Output signal (0 ≤ # ≤ 5) VOUT# reference voltage Vrms volts, root mean square watts SCXI-1124 User Manual Glossary-2 © National Instruments Corporation...
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Page 51: Index
SCXIbus to SCXI-1124 pin equivalences (illustration), 5-1 (table), 3-11 storage of constants in EEPROM specifications and ratings, 3-11 determining correct codes using with other boards, 3-10 for current output, 4-5 to 4-6 © National Instruments Corporation Index-1 SCXI-1124 User Manual... - Page 52 NI-DAQ driver software, 1-2 to 1-3 noise reduction, 4-4 to 4-5 GND <0..5> signal, 3-4 operation of SCXI-1124. See theory of operation. output voltage, 4-3 to 4-4 hardware installation, 2-3 to 2-4 hazardous voltage warnings, 3-1 SCXI-1124 User Manual Index -2 © National Instruments Corporation...
- Page 53 1-1 to 1-2 NI-DAQ driver software, 1-2 to 1-3 register-level programming, 1-3 to 1-4 technical support, B-1 unpacking, 1-5 theory of operation communication signals analog output circuitry, 4-3 to 4-6 © National Instruments Corporation Index-3 SCXI-1124 User Manual...
- Page 54 SCXIbus connector and interface, 4-2 unipolar mode, 4-3 unpacking the SCXI-1124, 1-5 voltage output circuitry, 4-3 to 4-4 specifications, A-1 to A-2 voltage-to-current converter, 4-5 voltages, hazardous, 3-1 VOUT <0..5> signal, 3-4 SCXI-1124 User Manual Index -4 © National Instruments Corporation...
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