Table of Contents
Related Manuals for National Instruments SCXI -1122
Summary of Contents for National Instruments SCXI -1122
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Page 1: User Manual
SCXI -1122 User Manual Sixteen-Channel Isolated Transducer Multiplexer Module for Signal Conditioning September 1999 Edition Part Number 320516B-01 © Copyright 1993, 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 ... ix Organization of This Manual ... ix Conventions Used in This Manual ... x The National Instruments Documentation Set ... xi Related Documentation ... xi Customer Communication ... xii Chapter 1 Introduction ... 1-1 What Your Kit Should Contain... 1-1 Software Programming Choices ... - Page 6 Excitation Calibration ... 5-4 Appendix A Specifications ... A-1 Analog Input ... A-1 Excitation ... A-3 Physical ... A-3 Environment ... A-3 Appendix B Customer Communication Glossary ... Glossary-1 Index ... Index-1 SCXI-1122 User Manual ... B-1 © National Instruments Corporation...
- Page 7 Table 4-1. Sense/Current Output Channel Associations ... 4-4 Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections with Current Excited Transducers... 4-7 Table 5-1. Maximum Allowable Error Ranges ... 5-4 © National Instruments Corporation Figures Tables Contents SCXI-1122 User Manual...
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Page 8: About This Manual
About This Manual This manual describes the electrical and mechanical aspects of the SCXI-1122 and contains information concerning its operation. The SCXI-1122 is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series for the National Instruments DAQ plug-in boards. -
Page 9: Conventions Used In This Manual
Lab board refers to the Lab-LC, Lab-NB, Lab-PC, and Lab-PC+ boards unless otherwise noted. MC refers to the Micro Channel series computers. MIO board MIO board refers to the National Instruments multichannel I/O DAQ boards, AT-MIO-16, MC-MIO-16, AT-MIO-16F-5, AT-MIO-16X, AT-MIO-16D, AT-MIO-64F-5, NB-MIO-16, and NB-MIO-16X, unless otherwise noted. -
Page 10: The National Instruments Documentation Set
• SCXI-1122 Register-Level Programmer Manual (part number 340696-01) 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 11: 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 12: Chapter 1 Introduction
The contents of the SCXI-1122 kit (part number 776572-22) are listed as follows: Kit Component SCXI-1122 module SCXI-1122 User Manual If your kit is missing any of the components, contact National Instruments. Detailed specifications of the SCXI-1122 are listed in Appendix A, Specifications. © National Instruments Corporation Part Number... -
Page 13: Software Programming Choices
LabWindows/CVI for Windows NI-DAQ Driver Software The NI-DAQ driver software is included at no charge with all National Instruments DAQ 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 conversion),... -
Page 14: Figure 1-1. The Relationship Between The Programming Environment, Ni-Daq, And Your Hardware
Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware The National Instruments PC, AT, and MC Series DAQ 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 15: Register-Level Programming
Introduction 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. The only users who should consider writing register-level software should meet at least one of the following criteria: •... -
Page 16: 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 17: Configuration And Installation
Jumper W1 configures the guard and the analog output ground, and enables the pseudodifferential reference mode. You must use software to further configure the module. Refer to your software manuals, or to the SCXI-1122 Register-Level Programmer Manual if you are a register-level programmer. © National Instruments Corporation SCXI-1122 User Manual... -
Page 18: Figure 2-1. Scxi-1122 Parts Locator Diagram
Configuration and Installation Chapter 2 Figure 2-1. SCXI-1122 Parts Locator Diagram SCXI-1122 User Manual © National Instruments Corporation... -
Page 19: Digital Signal Connections
If a module is not connected to a DAQ board, the position of W2 is irrelevant. The MISO line on the SCXI-1122 module is for reading the Module ID Register, the Status Register, and the EEPROM. National Instruments software does not read the Module ID automatically–you must indicate to the software which module is in which slot. -
Page 20: Current-Loop Receivers
The SCXI-1122 has pads for transforming individual channels to current-to-voltage converters. National Instruments offers an SCXI process current pack, which consists of a package of four 249 , 0.1%, 5 ppm, 1/4 W resistors. You can find the part number for this kit in the Optional Equipment section of Chapter 1, Introduction. - Page 21 Slide the module back into its enclosure. Reinstall the rear panel. 10. Reinstall the top cover and grounding screw. 11. Your module is ready to be installed into the chassis. © National Instruments Corporation Configuration and Installation Resistor Reference Designator SCXI-1122 User Manual...
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Page 22: Hardware Installation
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-1122 User Manual © National Instruments Corporation Chapter 2... -
Page 23: Chapter 3 Signal Connections
O NOT SUBSTITUTE PARTS OR MODIFY EQUIPMENT introducing additional hazards, do not install unauthorized parts or modify the module. Return the module to National Instruments for service and repair to ensure that its safety features are not compromised. Do not operate this equipment in a manner that contradicts the information specified in this document. - Page 24 SCXI-1122 can damage any or all of the boards connected to the SCXI chassis, the host computer, and the SCXI-1122 module. National Instruments is resulting from incorrect signal connections. If high voltages ( 30 Vrms, 42.4 Vpk or 60 Vdc) are present,...
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Page 25: Front Connector
For this reason treat all inputs as potentially hazardous if any inputs are in contact with hazardous voltages ( 30 Vrms, 42.4 Vpk or 60 Vdc). Number Figure 3-1. SCXI-1122 Front Connector Pin Assignments © National Instruments Corporation Signal Column Signal Name... -
Page 26: Front Signal Connection Descriptions
Reserved–This pin is reserved. Do not connect any signal to this pin. Positive Input Channel–These pins are connected to the positive input channels 0 through 15 respectively. Negative Input Channel–These pins are connected to the negative input channels 0 through 15 respectively. © National Instruments Corporation Chapter 3... -
Page 27: Analog Input Channel Signal Connections
250 Vrms between input or output channels, and 480 Vrms between input or output channels and earth ground) can damage the SCXI-1122, the SCXIbus, and the DAQ board. National Instruments is liable for any damages or injuries resulting from such signal connections. -
Page 28: Figure 3-2. Ground-Referenced Signal Connection With High Common-Mode Voltage
Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR Figure 3-4. Floating AC-Coupled Signal Connection Referenced SCXI-1122 User Manual to Chassis Ground for Better SNR Chapter 3 © National Instruments Corporation... -
Page 29: Figure 3-5. Ac-Coupled Signal Connection With High Common-Mode Voltage
Figure 3-6a, acquire 100 points on each channel then switch to the next channel and acquire a new set of samples, as shown in Figure 3-6b. © National Instruments Corporation total Signal Connections... -
Page 30: Excitation Channel Signal Connections
CH2 x 100 samples CH3 x 100 samples average the samples for each channel b. Good technique—software- driven scanning saves relay life. Single-Sample Channel Scanning liable for any damages or injuries resulting from such signal Chapter 3 © National Instruments Corporation... -
Page 31: Using The Internal Half-Bridge Completion
SCXI-1122. The connection is overvoltage-protected to 250 Vrms with power on and off. Warning: Exceeding the overvoltage protection on the temperature connections can damage the SCXI-1122, the SCXIbus, and the DAQ board. National Instruments is liable for any damages resulting from such signal connections. © National Instruments Corporation Maximum Load 3.333 V... -
Page 32: Rear Signal Connector
Signal Connections Rear Signal Connector Note: If you are using the SCXI-1122 with a National Instruments DAQ board and cable assembly, you do not need to read the remainder of this chapter. If you are using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1122, read this section. -
Page 33: Rear Signal Connection Descriptions
W1 to the analog reference on the SCXI-1122. You can use these pins as a general analog power ground tie point to the SCXI-1122 if necessary. © National Instruments Corporation Description Analog Output Ground–These pins are connected to the analog reference when jumper W1 is in position AB-R0. -
Page 34: Digital I/O Signal Connections
Notice that the temperature sensor is located on the terminal block. Warning: The SCXI-1122 analog outputs are not overvoltage-protected. Applying external voltages to these outputs can damage the SCXI-1122. National Instruments is liable for any damages resulting from such signal connections. -
Page 35: Table 3-2. Scxibus To Scxi-1122 Rear Signal Connector To Daq Board Pin Equivalences
Digital input specifications (referenced to DIGGND): input logic high voltage input logic low voltage input current leakage • Digital output specifications (referenced to DIGGND): output logic high voltage output logic low voltage © National Instruments Corporation MIO-16 Lab Boards ADIO0 ADIO1 ADIO2 EXTSTROBE* BDIO0 5.5 V with respect to DIGGND... -
Page 36: Chapter 4 Theory Of Operation
This chapter contains a functional overview of the SCXI-1122 module and explains the operation of each functional unit making up the SCXI-1122. Functional Overview The block diagram in Figure 4-1 illustrates the key functional components of the SCXI-1122. © National Instruments Corporation SCXI-1122 User Manual... -
Page 37: Figure 4-1. Scxi-1122 Block Diagram
Theory of Operation Chapter 4 Selector Input Amplifier Relays Relays Input InputT/Output Figure 4-1. SCXI-1122 Block Diagram SCXI-1122 User Manual © National Instruments Corporation... -
Page 38: Rear Signal Connector, Scxibus Connector, And Scxibus Interface
At any point in time one and only one of sixteen channels is connected to the isolation amplifier. In the four-wire scan mode the sixteen channels are divided into two © National Instruments Corporation SCXI-1122 User Manual... -
Page 39: Table 4-1. Sense/Current Output Channel Associations
Current Output Channel 0 Channel 8 Channel 1 Channel 9 Channel 2 Channel 10 Channel 3 Channel 11 Channel 4 Channel 12 Channel 5 Channel 13 Channel 6 Channel 14 Channel 7 Channel 15 Chapter 4 © National Instruments Corporation... -
Page 40: Excitation Output Channels
In case of a quarter-bridge configuration, you must provide an additional resistor–equal in value to your nominal strain © National Instruments Corporation shunting resistor introduces is -199 resistor should produce. For example,... -
Page 41: Figure 4-2. Series Connection With Current Excitation
Figure 4-3. Four-Wire Scan Connection with Multiplexed Current Excitation SCXI-1122 User Manual CH+0 CH-0 CH+1 CH-1 CH+2 CH-2 CH+15 CH-15 R T = R1 +...+R15 CH+8 CH+0 CH-0 CH-8 CH+9 CH+1 CH-1 CH-9 CH+15 CH+7 CH-7 CH-15 Any R Chapter 4 IEX+ IEX- © National Instruments Corporation... -
Page 42: Table 4-2. Pros And Cons Of Two-Wire And Four-Wire Connections With Current Excited Transducers
Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections Type Series connection with two-wire scanning Independent connection with four-wire scanning © National Instruments Corporation with Current Excited Transducers Pros 16 transducers per module All transducers are continuously excited Two-wire connections are... -
Page 43: Chapter 5 Calibration
Excitation Calibration section. You need to read the following section only if you are using National Instruments software and you intend to determine new calibration constants. -
Page 44: Gain And Offset Calibration
Disable auto-zeroing. d. Apply 9.9 V/G or -9.9 V/G e. Go to step 3. SCXI-1122 User Manual digits 0.004% standard 0.16% sufficient digits 0.004% standard 0.16% sufficient digits to the amplifier input. Chapter 5 © National Instruments Corporation... - Page 45 0 V as your two calibration points. When you are making a measurement and using National Instruments software, the driver automatically performs the software correction.
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Page 46: Excitation Calibration
You do not need to read the following section if you are going to use the factory-determined correction factors and you are using National Instruments software. If you want to determine a new set of voltage excitation calibration constants and you are using National Instruments software, use the following procedure: 1. -
Page 47: Appendix A Specifications
Max working voltage (signal + common mode) Overvoltage protection Protected terminals Vrms refers to sinusoidal waveform; V refers to DC or AC peak. © National Instruments Corporation 16 differential, 8 4-wire, software selectable Module Gain Max (Software Selectable) 0.01 0.02 0.05... - Page 48 4 Hz (-10 dB) or 4 kHz, software selectable 60 dB at 4 Hz bandwidth 20 minutes (0.2 + 150/gain) V/ C 10 ppm/ C for gain 1, 25 ppm/ C for gain < 1 © National Instruments Corporation Appendix A 160 dB 100 dB...
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Page 49: Excitation
Relative humidity Maximum altitude Safety Electrical Measuring and Test Equipment Installation Category Pollution degree © National Instruments Corporation 2 (1 voltage and 1 current) Quarter, half, or full Two 2.5 k 0.02% ratio tolerance resistors 3.333 V 0.04% 225 mA 30 ppm/ C 1.0 mA 0.04%... -
Page 50: 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 51 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 52 Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
- Page 53 Register-Level Programmer Manual Request 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-1122 Register-Level Programmer Manual Part Number: 340696-01 Please indicate your reasons for obtaining the register-level programmer manual. Check all that apply.
- Page 54 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-1122 User Manual Edition Date: September 1999 Part Number: 320516B-01 Please comment on the completeness, clarity, and organization of the manual.
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Page 55: Glossary
American National Standards Institute AOGND Analog Output Ground signal Arms amperes, root mean square American Wire Gauge BDIO Port B Digital Input/Output signal Celsius AC coupling capacitor © National Instruments Corporation Meaning pico- nano- micro- milli- kilo- mega- Glossary-1 Value... - Page 56 MIO gain SCXI gain total gain total hertz bias current bias current excitation channel IEX- Negative Current Excitation Output signal IEX+ Positive Current Excitation Output signal input current leakage inches SCXI-1122 User Manual Glossary-2 © National Instruments Corporation...
- Page 57 SCAL referenced single-ended (input) RSVD Reserved bit/signal resistance temperature detector RTSI Real-Time System Integration SCANCLK Scan Clock signal SCXI Signal Conditioning eXtensions for Instrumentation (bus) Software Developer's Kit © National Instruments Corporation Glossary-3 Glossary SCXI-1122 User Manual...
- Page 58 Half Voltage Excitation Output signal Virtual Instrument input logic high voltage input logic low voltage offset bias voltage ofsbias output logic high voltage output logic low voltage Vrms volts, root mean square watts SCXI-1122 User Manual Glossary-4 © National Instruments Corporation...
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Page 59: Index
1-5 optional equipment (table), 1-4 calibration equipment requirements, 5-1 to 5-2 excitation calibration, 4-4, 5-4 © National Instruments Corporation gain and offset calibration, 5-2 to 5-3 overview, 5-1 CH-(0:15) signal, 3-4 CH+(0:15) signal, 3-4 configuration. See also installation. - Page 60 (table), 2-4 digital signal connections (table), 2-3 Lab-NB/PC/PC+ boards SCXIbus to SCXI-1122 rear signal connector to DAQ board pin equivalences (table), 3-13 LabVIEW applications software, 1-2, 2-6 LabWindows applications software, 1-2, 2-6 Index-2 © National Instruments Corporation...
- Page 61 3-11 to 3-12 digital I/O signal connections, 3-12 to 3-13 pin assignments (illustration), 3-10 © National Instruments Corporation SCXIbus interface, 4-3 SCXIbus to SCXI-1122 rear signal connector to DAQ board pin equivalences (table), 3-13 signal descriptions, 3-11...
- Page 62 SCXIbus interface, 4-3 SCXI-1122 User Manual unpacking the SCXI-1122, 1-5 user-defined current receiver resistors. See current-loop receivers. VEX- signal, 3-4, 4-5 VEX/2 signal, 3-4 VEX+ signal, 3-4, 4-5 voltage (VEX) excitation channel, 3-8 Wheatstone bridge, 4-5 Index-4 © National Instruments Corporation...