National Instruments Module SCXI-1125 Uživatelský manuál

SCXITMSCXI-1125 User ManualSCXI-1125 User ManualApril 2008 372425B-01

© National Instruments Corporation 1-1 SCXI-1125 User Manual1About the SCXI-1125This chapter introduces the SCXI-1125 module and explains how to insta

Index© National Instruments Corporation I-3 SCXI-1125 User Manualtheory of multiplexed hardware operation, 4-3using software for scanning operationsLa

IndexSCXI-1125 User Manual I-4 ni.comfront connectorpin assignments (table), 2-6overview, 2-1temperature sensor connection, 2-7softwaremultiplexed sca

Chapter 1 About the SCXI-1125SCXI-1125 User Manual 1-2 ni.comNote For maximum allowable voltage for a particular terminal block refer to Table A-2,

Chapter 1 About the SCXI-1125© National Instruments Corporation 1-3 SCXI-1125 User Manual• The SCXI Quick Start Guide—This document contains a quick

Chapter 1 About the SCXI-1125SCXI-1125 User Manual 1-4 ni.comInstalling Application Software, NI-DAQ, and the DAQ DeviceRefer to the DAQ Getting Star

Chapter 1 About the SCXI-1125© National Instruments Corporation 1-5 SCXI-1125 User ManualConnecting the SCXI-1125 to a n E/M Series DAQ Device for Pa

Chapter 1 About the SCXI-1125SCXI-1125 User Manual 1-6 ni.comManually Adding Modules in NI-DAQmxIf you did not auto-detect the SCXI modules, you must

Chapter 1 About the SCXI-1125© National Instruments Corporation 1-7 SCXI-1125 User ManualTroubleshooting the Self-Test VerificationIf the Self-Test V

Chapter 1 About the SCXI-1125SCXI-1125 User Manual 1-8 ni.commodule following the steps listed in the SCXI Quick Start Guide. Click OK.b. If another

© National Instruments Corporation 2-1 SCXI-1125 User Manual2Connecting SignalsThis chapter describes the input and output signals connections to the

Chapter 2 Connecting SignalsSCXI-1125 User Manual 2-2 ni.comcompletely isolated from other channels. You can operate with common-mode voltage levels

SupportWorldwide Technical Support and Product Informationni.comNational Instruments Corporate Headquarters11500 North Mopac Expressway Austin, Texas

Chapter 2 Connecting Signals© National Instruments Corporation 2-3 SCXI-1125 User ManualFloating SignalIn cases where both signal lines at the tran

Chapter 2 Connecting SignalsSCXI-1125 User Manual 2-4 ni.comAC-CouplingYou can have an application where you wish to measure only AC voltages and rem

Chapter 2 Connecting Signals© National Instruments Corporation 2-5 SCXI-1125 User ManualThe value of the bias resistor should be between 100 kΩ and

Chapter 2 Connecting SignalsSCXI-1125 User Manual 2-6 ni.comTable 2-1. Front Signal Pin Assignments Front Connector Diagram Pin Number Column A Colu

Chapter 2 Connecting Signals© National Instruments Corporation 2-7 SCXI-1125 User ManualTemperature Sensor ConnectionPin C4 on the front signal con

Chapter 2 Connecting SignalsSCXI-1125 User Manual 2-8 ni.comTable 2-2. Rear Signal Pin AssignmentsRear Connector DiagramSignal Name Pin Number Pin N

© National Instruments Corporation 3-1 SCXI-1125 User Manual3Configuring and TestingThis chapter discusses configuring the SCXI-1125 in MAX for use wi

Chapter 3 Configuring and TestingSCXI-1125 User Manual 3-2 ni.comConnecting the SCXI-1125 in an SCXI Chassis to an E/M Series DAQ Device for Multip

Chapter 3 Configuring and Testing© National Instruments Corporation 3-3 SCXI-1125 User ManualNI-DAQmxIn NI-DAQmx, you can configure software settin

Chapter 3 Configuring and TestingSCXI-1125 User Manual 3-4 ni.com4. Select Analog Input.5. Select Voltage.6. If you are creating a task, you can se

Important InformationWarrantyThe SCXI-1125 is warranted against defects in materials and workmanship for a period of one year from the date of shipme

Chapter 3 Configuring and Testing© National Instruments Corporation 3-5 SCXI-1125 User Manual• Gain/input signal range—configure gain using module

Chapter 3 Configuring and TestingSCXI-1125 User Manual 3-6 ni.comCreating a Virtual ChannelTo create a virtual channel, complete the following step

Chapter 3 Configuring and Testing© National Instruments Corporation 3-7 SCXI-1125 User Manual8. Click the Device tab.9. Enter the appropriate infor

Chapter 3 Configuring and TestingSCXI-1125 User Manual 3-8 ni.comComplete the following steps to use channel strings in verifying the signal:1. Exp

© National Instruments Corporation 4-1 SCXI-1125 User Manual4Theory of OperationThe section includes a brief overview and a detailed discussion of the

Chapter 4 Theory of OperationSCXI-1125 User Manual 4-2 ni.comRefer to the Configurable Settings in MAX section of Chapter 3, Configuring and Testing,

Chapter 4 Theory of Operation© National Instruments Corporation 4-3 SCXI-1125 User ManualMultiplexed Hardware Operation TheoryWhen you configure a

Chapter 4 Theory of OperationSCXI-1125 User Manual 4-4 ni.comTheory of Parallel Hardware OperationIn parallel mode, the CH0 signal on the rear signal

© National Instruments Corporation 5-1 SCXI-1125 User Manual5Using the SCXI-1125This chapter discusses typical applications for the SCXI-1125. While t

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-2 ni.comthermocouple junction voltage and temperature, this voltage conversion (linearization)

ConventionsThe following conventions are used in this manual:< > Angle brackets that contain numbers separated by an ellipsis represent a range

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-3 SCXI-1125 User ManualComplete the following steps to calculate the overall temp

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-4 ni.comMaking High-Voltage MeasurementsAnother common use of the SCXI-1125 is to make measure

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-5 SCXI-1125 User ManualThe overall input impedance is reduced when attenuating th

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-6 ni.comFigure 5-1. Typical Program FlowchartYe sCreate Channel(Application Specific)Adjust T

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-7 SCXI-1125 User ManualGeneral Discussion of Typical FlowchartThe following secti

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-8 ni.comtime. For continuous acquisition, you must use a while loop around the acquisition com

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-9 SCXI-1125 User ManualAcquiring, Analyzing, and PresentingAfter configuring the

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-10 ni.comTable 5-4. Programming a Task in LabVIEW Flowchart Step VI or Program StepCreate Tas

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-11 SCXI-1125 User ManualUsing a DAQmx Channel Property Node in LabVIEWYou can use

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-12 ni.com7. Change the property to read or write to either get the property or write a new val

© National Instruments Corporation v SCXI-1125 User ManualContentsChapter 1About the SCXI-1125What You Need to Get Started ...

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-13 SCXI-1125 User ManualFollow the general programming flowchart or open an examp

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-14 ni.comText Based ADEsYou can use text based ADEs such as LabWindows/CVI, Measurement Studio

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-15 SCXI-1125 User ManualNote This is not a complete list of NI-DAQmx properties

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-16 ni.comTraditional NI-DAQ (Legacy) in LabVIEWLabVIEW is a graphical programming environment

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-17 SCXI-1125 User ManualTypical Program FlowAfter you have determined how you wan

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-18 ni.comConfigure the SCXI-1125 Settings Using Traditional NI-DAQ (Legacy) in LabVIEWYou can

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-19 SCXI-1125 User ManualAn example of using the AI Parameter VI to control an SCX

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-20 ni.comConvert Scaling Using Traditional NI-DAQ (Legacy) in LabVIEWIf you need scaling, you

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-21 SCXI-1125 User ManualTraditional NI-DAQ (Legacy) in Text-Based ADEsNI text-bas

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-22 ni.comNote NI strongly recommends monitoring the built-in error status of each NI-DAQ func

ContentsSCXI-1125 User Manual vi ni.comChapter 3Configuring and TestingSCXI-1125 Software-Configurable Settings ...

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-23 SCXI-1125 User ManualPerform Offset Null Compensation Using Traditional NI-DAQ

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-24 ni.comthe data corresponds to a scanned channel for easier access by C applications. BASIC

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-25 SCXI-1125 User Manualsupport virtual channels using Data Neighborhood (DAQ Cha

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-26 ni.comThe last parameter, channels, is the list of channels that are scanned for module z.

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-27 SCXI-1125 User ManualNote You cannot mix virtual channels with the SCXI chann

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-28 ni.comC and Low-Level DAQ FunctionsWhen using a C-based environment, several steps are need

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-29 SCXI-1125 User ManualAfter parallel mode has been configured in software, you

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-30 ni.comCalibrationThe SCXI-1125 is shipped with a calibration certificate and is calibrated

Chapter 5 Using the SCXI-1125© National Instruments Corporation 5-31 SCXI-1125 User ManualOne-Point Offset CalibrationTo perform offset calibration

Chapter 5 Using the SCXI-1125SCXI-1125 User Manual 5-32 ni.comIf you are using a C-based ADE, use the following procedure to do an offset calibrati

Contents© National Instruments Corporation vii SCXI-1125 User ManualConfiguring Channel Properties...

© National Instruments Corporation A-1 SCXI-1125 User ManualASpecificationsThis appendix lists the specifications for the SCXI-1125 modules. These spe

Appendix A SpecificationsSCXI-1125 User Manual A-2 ni.comOvervoltage protectionIsolated connector pins:Powered on and off...±3

Appendix A Specifications© National Instruments Corporation A-3 SCXI-1125 User ManualAbsolute AccuracyNominal RangeOverall Gain% of ReadingOffsetSyst

Appendix A SpecificationsSCXI-1125 User Manual A-4 ni.com±10 mV 500 0.08 0.53 20 μV 1.3 μV 21.8 μV 0.27 μV 4.70 μV 0.0027 1.0 μV 80μV±5 mV 1000 0.08

Appendix A Specifications© National Instruments Corporation A-5 SCXI-1125 User ManualAnalog InputsNumber of input channels ... 8 d

Appendix A SpecificationsSCXI-1125 User Manual A-6 ni.comNormal Mode Rejection, 50/60 Hz (NMRR)4 Hz filter enabled ...60 dBCr

Appendix A Specifications© National Instruments Corporation A-7 SCXI-1125 User ManualPhysicalFigure A-1. SCXI-1125 DimensionsWeight...

Appendix A SpecificationsSCXI-1125 User Manual A-8 ni.comMaximum Working VoltageMaximum voltage rating refers to the signal voltage plus the common m

Appendix A Specifications© National Instruments Corporation A-9 SCXI-1125 User ManualSafetyThis product is designed to meet the requirements of the f

Appendix A SpecificationsSCXI-1125 User Manual A-10 ni.comEnvironmental ManagementNational Instruments is committed to designing and manufacturing pr

ContentsSCXI-1125 User Manual viii ni.comAppendix ASpecificationsAppendix BUsing SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or LaterAp

© National Instruments Corporation B-1 SCXI-1125 User ManualBUsing SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or LaterNote This append

Appendix B Using SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or LaterSCXI-1125 User Manual B-2 ni.comchannels is the list of channels t

© National Instruments Corporation C-1 SCXI-1125 User ManualCRemoving the SCXI-1125This appendix explains how to remove the SCXI-1125 from MAX and an

Appendix C Removing the SCXI-1125SCXI-1125 User Manual C-2 ni.com2. If the SCXI-1125 is the module cabled to the E Series DAQ device, disconnect the

© National Instruments Corporation D-1 SCXI-1125 User ManualDCommon QuestionsThis appendix lists common questions related to the use of the SCXI-1125.

Appendix D Common QuestionsSCXI-1125 User Manual D-2 ni.comWhich version of NI-DAQ is needed to work with the SCXI-1125 and how do I get the most c

Appendix D Common Questions© National Instruments Corporation D-3 SCXI-1125 User ManualIn LabVIEW, can I use different input limits for the same SC

Appendix D Common QuestionsSCXI-1125 User Manual D-4 ni.comIn LabVIEW, can I use a VI to change my filter setting?In NI-DAQmx, you can change the f

© National Instruments Corporation G-1 SCXI-1125 User ManualGlossarySymbol Prefix Valueppico10 – 12nnano10 – 9μ micro 10 – 6m milli 10 – 3k kilo 10 3

GlossarySCXI-1125 User Manual G-2 ni.comAA/D analog-to-digitalabsolute accuracy The maximum difference between the measured value from a data acquisit

Contents© National Instruments Corporation ix SCXI-1125 User ManualTablesTable 2-1. Front Signal Pin Assignments ...

Glossary© National Instruments Corporation G-3 SCXI-1125 User ManualCCCelsiusCE Conformité Européenne—The European emissions control standard. The CE

GlossarySCXI-1125 User Manual G-4 ni.comDAQ Data acquisition—(1) collecting and measuring electrical signals from sensors, transducers, and test probe

Glossary© National Instruments Corporation G-5 SCXI-1125 User ManualFfiltering A type of signal conditioning that allows you to remove unwanted signal

GlossarySCXI-1125 User Manual G-6 ni.comisolation A type of signal conditioning in which you isolate the transducer signals from the computer for safe

Glossary© National Instruments Corporation G-7 SCXI-1125 User Manualmultiplexed mode An SCXI operating mode in which analog input channels are multipl

GlossarySCXI-1125 User Manual G-8 ni.comppm parts per millionPXIA rugged, open system for modular instrumentation based on CompactPCI, with special me

Glossary© National Instruments Corporation G-9 SCXI-1125 User ManualSCXI Signal Conditioning eXtensions for Instrumentation—the National Instruments p

GlossarySCXI-1125 User Manual G-10 ni.comTthermocouple A temperature sensor created by joining two dissimilar metals. The junction produces a small vo

© National Instruments Corporation I-1 SCXI-1125 User ManualIndexAAC and DC voltage connections, 2-1AC-coupling, 2-4floating AC-coupled signal connect

IndexSCXI-1125 User Manual I-2 ni.comdigital lines, unavailability on DAQ device, D-2digital signals on SCXI-1125 (table), D-3documentationconventions