National Instruments 776572-1600 User Manual
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National Instruments 776572-1600 User Manual

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SCXI
TM
SCXI-1125 User Manual
SCXI-1125 User Manual
October 2009
372425C-01

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Summary of Contents for National Instruments 776572-1600

  • Page 1 SCXI SCXI-1125 User Manual SCXI-1125 User Manual October 2009 372425C-01...
  • Page 2 Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545 For further support information, refer to the Technical Support Information document. To comment on National Instruments documentation, refer to the National Instruments Web site at and enter the ni.com/info...
  • Page 3 Instruments Corporation. National Instruments respects the intellectual property of others, and we ask our users to do the same. NI software is protected by copyright and other intellectual property laws. Where NI software may be used to reproduce software or other materials belonging to others, you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction.
  • Page 4 Conventions The following conventions are used in this manual: <> Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name—for example, P0.<3..0>. Square brackets enclose optional items—for example, [ response »...

  • Page 5: Table Of Contents

    Chapter 1 About the SCXI-1125 What You Need to Get Started ..................1-1 National Instruments Documentation ................1-3 Installing Application Software, NI-DAQ, and the DAQ Device .........1-4 Installing the SCXI-1125 Module into the SCXI Chassis.......1-4 Connecting the SCXI-1125 in an SCXI Chassis to an E/M/X Series DAQ Device for Multiplexed Scanning ............1-4...
  • Page 6 Contents Chapter 3 Configuring and Testing SCXI-1125 Software-Configurable Settings ..............3-1 Common Software-Configurable Settings ............3-1 Filter Bandwidth ................3-1 Gain/Input Range................3-1 Connecting the SCXI-1125 in an SCXI Chassis to an E/M/X Series DAQ Device for Multiplexed Scanning............3-2 Connecting the SCXI-1125 in a PXI/SCXI Combination Chassis to an E/M/X Series DAQ Device for Multiplexed Scanning........
  • Page 7 Other Application Documentation and Material ............5-29 Traditional NI-DAQ (Legacy) CVI Examples ..........5-29 Traditional NI-DAQ (Legacy) Measurement Studio Examples......5-29 Calibration ........................5-30 Calibration Procedures ..................5-30 One-Point Offset Calibration ............5-31 Two-Point Gain and Offset Calibration ..........5-32 © National Instruments Corporation SCXI-1125 User Manual...
  • Page 8 Contents Appendix A Specifications Appendix B Using SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or Later Appendix C Removing the SCXI-1125 Appendix D Common Questions Glossary Index Figures Figure 2-1. Connecting a Ground-Referenced Signal ..........2-2 Figure 2-2. Connecting a Floating Signal..............2-3 Figure 2-3.
  • Page 9 Gain Values and Input Limits ..............5-31 Table A-1. Input Signal Range Versus Gain ............A-1 Table A-2. Terminal Block Maximum Voltages .............A-8 Table D-1. Comparison of the SCXI-1125 with the SCXI-1120 ......D-1 Table D-2. Digital Signals on the SCXI-1125............D-3 © National Instruments Corporation SCXI-1125 User Manual...

  • Page 10: About The Scxi-1125

    To set up and use the SCXI-1125 module, you need the following: ❑ Hardware – SCXI-1125 module – One of the following terminal blocks: • SCXI-1305 • SCXI-1313A • SCXI-1320 • SCXI-1327 • SCXI-1328 • SCXI-1338 • TBX-1316 • TBX-1328 • TBX-1329 © National Instruments Corporation SCXI-1125 User Manual...
  • Page 11 Chapter 1 About the SCXI-1125 For maximum allowable voltage for a particular terminal block refer to Table A-2, Note Terminal Block Maximum Voltages. – SCXI or PXI/SCXI combination chassis – One of the following: • E/M/X Series multifunction DAQ device •...

  • Page 12: National Instruments Documentation

    • Software documentation—You may have both application software and NI-DAQ software documentation. National Instruments (NI) application software includes LabVIEW, LabWindows/CVI, and Measurement Studio. After you set up the hardware system, use either your application software documentation or the NI-DAQ documentation to help you write your application.

  • Page 13: Installing Application Software, Ni-Daq, And The Daq Device

    Chapter 1 About the SCXI-1125 • One or more of the following help files for software information: – Start»All Programs»National Instruments»NI-DAQ» NI-DAQmx Help – Start»All Programs»National Instruments»NI-DAQ» Traditional NI-DAQ User Manual – Start»All Programs»National Instruments»NI-DAQ» Traditional NI-DAQ Function Reference Help •...

  • Page 14: Connecting The Scxi-1125 In A Pxi/Scxi Combination Chassis To An E/M/X Series Daq Device For Multiplexed Scanning

    Connect additional SCXI-1125 modules intended for parallel mode operation by repeating steps 2 through 4. Check the installation, making sure the cable is securely fastened at both ends. Power on the SCXI chassis. Power on the computer. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 15: Verifying The Scxi-1125 Installation In Software

    Chapter 1 About the SCXI-1125 If you have already installed the appropriate software, you are ready to configure the SCXI-1125 module(s) you installed for parallel mode operation. Verifying the SCXI-1125 Installation in Software Refer to the SCXI Quick Start Guide for information about verifying the SCXI installation.

  • Page 16: Troubleshooting The Self-Test Verification

    Expand the list of NI-DAQmx devices by clicking the + next to NI-DAQmx Devices. Right-click the SCXI chassis and click Properties to load the chassis configurator. Under the Modules tab, ensure that the cabled module is listed in the correct slot. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 17 Chapter 1 About the SCXI-1125 If the cabled module is not listed in the correct slot, complete the following troubleshooting steps: If the cabled module is not listed in the correct slot and the slot is empty, click the drop-down listbox next to the correct slot and select the cabled module.

  • Page 18: Connecting Signals

    The pin assignment for the SCXI-1125 front signal connector is shown in Table 2-1. The positive input terminal for each channel is in Column A and the negative input terminal for each channel is in Column C. Input © National Instruments Corporation SCXI-1125 User Manual...

  • Page 19: Ground-Referenced Signal

    Chapter 2 Connecting Signals connections to each channel are fully floating with respect to ground and completely isolated from other channels. You can operate with common-mode voltage levels up to 300 V Figures 2-1 through 2-4 show signal connection methods that give the highest noise immunity.

  • Page 20: Floating Signal

    Connecting the signal to chassis ground breaks the isolation barrier. – – Module Figure 2-2. Connecting a Floating Signal © National Instruments Corporation SCXI-1125 User Manual...

  • Page 21: Ac-Coupling

    Chapter 2 Connecting Signals AC-Coupling You can have an application where you wish to measure only AC voltages and remove the DC component of a signal before amplification and sampling. In such cases, you can connect a capacitor in series with one or both input terminals of the SCXI-1125, as shown in Figures 2-3 and 2-4.

  • Page 22: Pin Assignments

    Do not make signal connections to pins A2, A4, A6, A8, C2, C4, C6, or C8 on the Caution front signal connector. Connecting external signals to these pins can damage the SCXI-1125 Module. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 23: Table 2-1. Front Signal Pin Assignments

    Chapter 2 Connecting Signals Table 2-1. Front Signal Pin Assignments Front Connector Diagram Pin Number Column A Column B Column C AI 0 + — AI 0 – — — — Column AI 1 + — AI 1 – — —...

  • Page 24: Temperature Sensor Connection

    If the E/M/X Series DAQ device is connected to the SCXI-1125, these digital lines are unavailable for general-purpose digital I/O. The rear signal pin assignments are shown in Table 2-2. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 25: Table 2-2. Rear Signal Pin Assignments

    Chapter 2 Connecting Signals Table 2-2. Rear Signal Pin Assignments Rear Connector Diagram Signal Name Pin Number Pin Number Signal Name AI GND AI GND CH 0 + CH 0 – CH 1 + CH 1– CH 2 + CH 2 – CH 3 + CH 3 –...

  • Page 26: Configuring And Testing

    Gain/input range is a software-configurable setting that allows you to choose the appropriate amplification to fully utilize the range of the E/M/X Series DAQ device. In most applications NI-DAQ chooses and sets the gain for you determined by the input range. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 27: Connecting The Scxi-1125 In An Scxi Chassis To An E/M/X Series Daq Device For Multiplexed Scanning

    Chapter 3 Configuring and Testing Connecting the SCXI-1125 in an SCXI Chassis to an E/M/X Series DAQ Device for Multiplexed Scanning Refer to the SCXI Quick Start Guide to install the cable adapter and connect the SCXI modules to the DAQ device. If you have already installed the appropriate software, refer to Chapter 3, Configuring and Testing, to configure the SCXI-1125 module(s).

  • Page 28: Ni-Daqmx

    To create a new NI-DAQmx global task or channel, complete the following steps: Double-click Measurement & Automation on the desktop. Right-click Data Neighborhood and select Create New. Select NI-DAQmx Task or NI-DAQmx Global Channel, and click Next. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 29: Traditional Ni-Daq (Legacy)

    Chapter 3 Configuring and Testing Select Analog Input. Select Voltage. If you are creating a task, you can select a range of channels by holding down the <Shift> key while selecting the channels. You can select multiple individual channels by holding down the <Ctrl> key while selecting channels.

  • Page 30: Configuring Module Property Pages In Traditional Ni-Daq (Legacy)

    If you need to change the module configuration, right-click the module and repeat steps 1 through 4. Test the system following the steps in the Troubleshooting the Self-Test Verification section of Chapter 1, About the SCXI-1125. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 31: Creating A Virtual Channel

    Chapter 3 Configuring and Testing Creating a Virtual Channel To create a virtual channel, complete the following steps: Right-click Data Neighborhood and select Create New. Select Traditional NI-DAQ Virtual Channel and click Finish. Click Add Channel. Select Analog Input from the drop-down list and click Next. Enter the Channel Name and Channel Description, and click Next.

  • Page 32: Verifying The Signal In Traditional Ni-Daq (Legacy)

    The slots in a chassis are numbered from left to right, starting with 1. • channel is the channel that is sampled from module z. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 33: Verifying The Signal Using Virtual Channel

    Chapter 3 Configuring and Testing Use the format n to verify the signal, where n is a ob x ! sc y ! md z ! single input channel. Complete the following steps to use channel strings in verifying the signal: Expand Devices and Interfaces.

  • Page 34: Theory Of Operation

    ±5 V to ±2.5 mV. When the SCXI-1125 is used with a terminal block that provides attenuation, the input range expands up to 1000 V. Refer to Appendix A, Specifications for a full list of input ranges. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 35: Filter Bandwidth And Cutoff Frequency

    SCXI-1125. Using this mode of operation, you can scan all input channels of the SCXI-1125 into one output channel that is read by the National Instruments DAQ device. You can also multiplex the CJC channel that connects to a sensor on the SCXI terminal block for making temperature measurements.

  • Page 36: Multiplexed Hardware Operation Theory

    When performing multiple scans, the list pointer of the module automatically wraps around and starts scanning with the first channel in the scan list. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 37: Operating In Parallel Mode

    Chapter 4 Theory of Operation Operating in Parallel Mode You can configure the SCXI-1125 to operate in parallel mode as described in Chapter 1, About the SCXI-1125. In parallel mode, all eight analog output channels on the SCXI-1125 are connected to eight analog input channels on the E/M/X Series DAQ device.

  • Page 38: Using The Scxi-1125

    Knowing the temperature at the point where the thermocouple is connected to the measurement instrument allows you to determine the correct temperature reading at the thermocouple junction. Due to the nonlinear relationship between © National Instruments Corporation SCXI-1125 User Manual...
  • Page 39 You have completed the steps to get the true temperature reading from the thermocouple junction. National Instruments software ADEs have useful conversion functions for CJC. In LabVIEW, virtual channels with the CJC channel invoked or the Convert Thermocouple Reading VI are used. In C, use the NI-DAQ function, .
  • Page 40 ± (21.73 µV + 2.44 µV), which corresponds to about 0.59 °C. If you were to choose a 16-bit board, you can achieve a code width of 0.153 µV, producing a total system error of 0.53 °C. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 41: Making High-Voltage Measurements

    Chapter 5 Using the SCXI-1125 Making High-Voltage Measurements Another common use of the SCXI-1125 is to make measurements up to 1000 VDC. Making measurements beyond ± 5 V requires use of the an attenuator terminal block. The SCXI-1327 and SCXI-1313A terminal blocks have a selectable attenuator for choosing between no attenuation or 100:1 attenuation, which allows you to use the SCXI-1125 with up to 300 V...

  • Page 42: Developing Your Application In Ni-Daqmx

    Typical Program Flowchart Figure 5-1 shows a typical program flowchart for creating a task to configure channels, take a measurement, analyze and present the data, stop the measurement, and clear the task. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 43: Figure 5-1. Typical Program Flowchart

    Chapter 5 Using the SCXI-1125 Create Task Using DAQ Assistant? Create a Task Programmatically Create Task in DAQ Assistant or MAX Create Channel Create Another (Application Specific) Channel? Hardware Timing/Triggering? Further Configure Channels? Adjust Timing Settings Configure Channels Analyze Data? Process Start Measurement Data...

  • Page 44: General Discussion Of Typical Flowchart

    DAQ Assistant or programmatically using function calls or property nodes. If you create a task in the DAQ Assistant, you can still modify the timing properties of the task programmatically in your application. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 45: Configuring Channel Properties

    Chapter 5 Using the SCXI-1125 When programmatically adjusting timing settings, you can set the task to acquire continuously, acquire a buffer of samples, or acquire one point at a time. For continuous acquisition, you must use a while loop around the acquisition components even if you configured the task for continuous acquisition using MAX or the DAQ Assistant.

  • Page 46: Acquiring, Analyzing, And Presenting

    Help»VI, Function, & How-To Help from the LabVIEW menu bar. Note Except where otherwise stated, the VIs in Table 5-4 are located on the Functions» All Functions»NI Measurements»DAQmx - Data Acquisition subpalette and accompanying subpalettes in LabVIEW. © National Instruments Corporation SCXI-1125 User Manual...

  • Page 47: Table 5-4. Programming A Task In Labview

    Chapter 5 Using the SCXI-1125 Table 5-4. Programming a Task in LabVIEW Flowchart Step VI or Program Step Create Task in DAQ Assistant Create a located on the DAQmx Task Name Constant Controls»All Controls»I/O»DAQmx Name Controls subpalette, right-click it, and select New Task (DAQ Assistant). Create a Task —This VI is optional if you created DAQmx Create Task.vi...

  • Page 48: Using A Daqmx Channel Property Node In Labview

    If you do not use Active Channels, the properties are set on all of the channels in the task. Right-click ActiveChans, and select Add Element. Left-click the new ActiveChans box. Navigate through the menus, and select the property you wish to define. © National Instruments Corporation 5-11 SCXI-1125 User Manual...

  • Page 49: Specifying Channel Strings In Ni-Daqmx

    Chapter 5 Using the SCXI-1125 Change the property to read or write to either get the property or write a new value. Right-click the property, go to Change To, and select Write, Read, or Default Value. After you have added the property to the property node, right-click the terminal to change the attributes of the property, add a control, constant, or indicator.
  • Page 50 Add Element. To change the new property, left-click it and select the property you wish to define. Note Refer to the LabVIEW Help for information about property nodes and specific NI-DAQmx properties. © National Instruments Corporation 5-13 SCXI-1125 User Manual...

  • Page 51: Text Based Ades

    Chapter 5 Using the SCXI-1125 Text Based ADEs You can use text based ADEs such as LabWindows/CVI, Measurement Studio, Visual Basic, .NET, and C# to create code for using the SCXI-1125. LabWindows/CVI LabWindows/CVI works with the DAQ Assistant in MAX to generate code for a task.

  • Page 52: Developing Your Application In Traditional Ni-Daq (Legacy)

    Measurement Studio, and other text-based ADEs. These NI ADEs provide greater flexibility and access to more settings than MAX, but you can use ADEs in conjunction with MAX to quickly create a customized application. © National Instruments Corporation 5-15 SCXI-1125 User Manual...

  • Page 53: Traditional Ni-Daq (Legacy) In Labview

    Chapter 5 Using the SCXI-1125 Traditional NI-DAQ (Legacy) in LabVIEW LabVIEW is a graphical programming environment for test and measurement application development with built-in easy to use tools for data acquisition, analysis, and display. You can use functional graphical blocks called subVIs to easily create a custom application that fully utilizes the SCXI-1125 programmable functionality.

  • Page 54: Typical Program Flow

    Create Virtual Channel in MAX Configure Mode Properties Start Acquisition Take Measurements Continue Sampling? Scale, Analyze, and Display Clear Acquisition Error Handling Figure 5-3. Typical SCXI-1125 Program Flow with Traditional NI-DAQ (Legacy) © National Instruments Corporation 5-17 SCXI-1125 User Manual...

  • Page 55: Configure The Scxi-1125 Settings Using Traditional Ni-Daq (Legacy) In Labview

    Chapter 5 Using the SCXI-1125 Configure the SCXI-1125 Settings Using Traditional NI-DAQ (Legacy) in LabVIEW You can configure SCXI-1125 settings in MAX using the virtual channel. To configure and control the SCXI-1125 from LabVIEW, use the AI Parameter VI. You can find AI Parameter VI in the function subpalette Data Acquisition»Analog Input»Advanced Analog Input.

  • Page 56: Configure, Start Acquisition, And Take Readings Using Traditional Ni-Daq (Legacy) In Labview

    For more information about using the intermediate data acquisition Traditional NI-DAQ (Legacy) functions, refer to the LabVIEW Help. You also can use the LabVIEW Help for more detailed information about the various inputs and outputs of these functions. © National Instruments Corporation 5-19 SCXI-1125 User Manual...

  • Page 57: Convert Scaling Using Traditional Ni-Daq (Legacy) In Labview

    Chapter 5 Using the SCXI-1125 Convert Scaling Using Traditional NI-DAQ (Legacy) in LabVIEW If you need scaling, you can either use an analog input voltage virtual channel with a custom scale configured in MAX or SCXI channel strings, and provide scaling in your LabVIEW application. If you are using SCXI channel strings, you can easily convert the SCXI-1125 voltage signal measurements in your application into scaled units of interest such as pounds or newtons.

  • Page 58: Traditional Ni-Daq (Legacy) In Text-Based Ades

    Table 5-7. For additional information such as the function prototypes, parameters, and usage instructions for each function, refer to the Traditional NI-DAQ (Legacy) Function Reference Help installed by default in Start»All Programs»National Instruments» NI-DAQ. © National Instruments Corporation...

  • Page 59: Configure Module Settings Using Traditional Ni-Daq (Legacy) C Api

    NI-DAQ function calls shown in Table 5-8. For more information regarding each setting, refer to the Traditional NI-DAQ (Legacy) Function Reference Help installed by default in Start»All Programs»National Instruments»NI-DAQ. SCXI-1125 User Manual 5-22 ni.com...

  • Page 60: Perform Offset Null Compensation Using Traditional Ni-Daq (Legacy) C Api

    , the resultant data is not SCAN_Op organized by channel, so you should demultiplex the data using rearranges, or demultiplexes, data acquired by SCAN_Demux SCAN_Demux into row-major order, meaning each row of the array holding SCAN_Op © National Instruments Corporation 5-23 SCXI-1125 User Manual...

  • Page 61: Perform Scaling, Analysis, And Display

    For more information regarding each acquisition function, refer to the Traditional NI-DAQ (Legacy) Function Reference Help installed by default in Start»All Programs»National Instruments» NI-DAQ. Perform Scaling, Analysis, and Display...

  • Page 62: Labview And The Scxi Channel String

    DAQ device to be automatically set to fit the input limits parameter. When this specifier is omitted, the default gain on the E Series DAQ device, usually the lowest gain, is used, but the SCXI-1125 gain is adjusted to fit the input limits. © National Instruments Corporation 5-25 SCXI-1125 User Manual...

  • Page 63: Labview And The Virtual Channel String

    Chapter 5 Using the SCXI-1125 The last parameter, channels, is the list of channels that are scanned for module z. It can have several formats: • n, where n is a single input channel. ob x ! sc y ! md z ! •...

  • Page 64: Performing A Multiplexed Scan

    This is not a comprehensive discussion of SCXI scanning using LabVIEW or Measurement Studio, but it should give you enough information to help you get started with the examples that are shipped with these software packages. © National Instruments Corporation 5-27 SCXI-1125 User Manual...

  • Page 65: C And Low-Level Daq Functions

    Chapter 5 Using the SCXI-1125 C and Low-Level DAQ Functions When using a C-based environment, several steps are needed to configure the SCXI-1125 for multiplexed scanning. The following procedure outlines the steps for programming with the low-level DAQ function calls: Prepare the SCXI-1125 settings by either loading the original SCXI configuration settings using , or by specifying...

  • Page 66: C And Parallel Mode

    By default, the example programs are installed in C:\Program . More examples Files\National Instruments\CVI x . x \Samples are installed by default in C:\Program Files\National Instruments\NI-DAQ\Examples Traditional NI-DAQ (Legacy) Measurement Studio Examples Many example programs ship with NI-DAQ.

  • Page 67: Calibration

    SCXI-1125 module. Calibration Procedures You can calibrate the offset on the SCXI-1125 using National Instruments software. When calibrating the offset on the SCXI-1125, make sure the DAQ device you are using has been calibrated recently or you will invalidate the offset calibration on the SCXI-1125.

  • Page 68: One-Point Offset Calibration

    Repeat steps 2 through 3 for calibrating the offset for additional channels or gain combinations. Table 5-9. Gain Values and Input Limits Gain Range (V) ±5 ±2.5 ±1 ±0.5 ±0.25 ±0.125 ±0.05 ±0.025 ±0.020 ±0.010 © National Instruments Corporation 5-31 SCXI-1125 User Manual...

  • Page 69: Two-Point Gain And Offset Calibration

    Chapter 5 Using the SCXI-1125 Table 5-9. Gain Values and Input Limits (Continued) Gain Range (V) 1000 ±0.005 2000 ±0.0025 If you are using a C-based ADE, use the following procedure to do an offset calibration on the SCXI-1125: Make sure the DAQ device or DMM you are using has a valid calibration and meets the accuracy specifications for your application.

  • Page 70: Table A-1. Input Signal Range Versus Gain

    VDC peak 1000 ±5 mV or VDC 1000 peak 2000 ±2.5 mV or VDC 2000 peak Refer to Tables 5-1 and 5-2 for extended range using the SCXI-1313A, SCXI-1327, Note and TBX-1316. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 71 Appendix A Specifications Overvoltage protection Isolated connector pins: Powered on and off......±300 V Inputs protected .......CH0..CH7 Non-isolated connector pins: Powered on and off......+5.5V/–0.5 V SCXI-1125 User Manual ni.com...
  • Page 72 Appendix A Specifications © National Instruments Corporation SCXI-1125 User Manual...
  • Page 73 Appendix A Specifications SCXI-1125 User Manual ni.com...
  • Page 74 ......500 Hz Slew rate Typical..........0.15 V/s Minimum.........0.1 V/s Scan interval accuracy ±0.5%..........3 s ±0.187%.......... 10 s ±0.006%.......... 28 s ±0.0015%........32 s Using a PXI-6251 with the SHC68-68-EPM cable (1 m). © National Instruments Corporation SCXI-1125 User Manual...
  • Page 75 Appendix A Specifications Common mode rejection ratio, 50/60 Hz (CMRR) 4 Hz filter enabled ......160 dB 10kHz filter enabled ......98 dB Normal mode rejection, 50/60 Hz (NMRR) 4 Hz filter enabled ......60 dB Crosstalk at 1kHz Adjacent channels......–75 dB All other channels......–90 dB Input coupling Default ..........DC Using SCXI-1305 or TBX-1329 ..AC or DC...

  • Page 76: Figure A-1. Scxi-1125 Dimensions

    Appendix A Specifications Calibration External calibration interval....1 year Physical 3.0 cm (1.2 in.) 17.2 cm (6.8 in.) 18.8 cm (7.4 in.) Figure A-1. SCXI-1125 Dimensions Weight............ 641 g (22.6 oz) © National Instruments Corporation SCXI-1125 User Manual...

  • Page 77: Table A-2. Terminal Block Maximum Voltages

    Appendix A Specifications Maximum Working Voltage Maximum voltage rating refers to the signal voltage plus the common mode voltage (Signal + common mode). Voltage of each input shall remain within 300 V of ground. Channel-to-earth ........300 V, Measurement Category II Channel-to-channel.........300 V, Measurement Category II Table A-2.
  • Page 78 Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit , search by model ni.com/certification number or product line, and click the appropriate link in the Certification column. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 79 EU Customers recycling center. For more information about WEEE recycling centers, National Instruments WEEE initiatives, and compliance with WEEE Directive 2002/96/EC on Waste Electrical and Electronic Equipment, visit ni.com/environment/weee National Instruments (RoHS) National Instruments RoHS ni.com/environment/rohs_china (For information about China RoHS compliance, go to ni.com/environment/rohs_china...
  • Page 80 • is the slot position where the module is located, with being the md z particular slot number. The slots in a chassis are numbered from left to right starting with 1. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 81 Appendix B Using SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or Later is the list of channels that are scanned for module . It can have channels several formats: • , where is a single input channel. ob x ! sc y ! md z ! nx •...

  • Page 82: Removing The Scxi-1125

    To remove the SCXI-1125 module from a chassis, complete the following steps while referring to Figure C-1: Power off the chassis. Do not remove the SCXI-1125 module from a chassis that is powered on. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 83 Appendix C Removing the SCXI-1125 If the SCXI-1125 is the module cabled to the E/M/X Series DAQ device, disconnect the cable. Remove any terminal block that connects to the SCXI-1125. Rotate the thumbscrews that secure the SCXI-1125 to the chassis counterclockwise until they are loose, but do not completely remove the thumbscrews.

  • Page 84: Table D-1. Comparison Of The Scxi-1125 With The Scxi-1120

    M TEMP (non-scannable) or M TEMP, CJ TEMP (scannable) D TEMP (direct channel) Offset error ±6 µV ± 3 mV/gain 0.2 mV/gain typical Gain error ±0.2% typ, ±0.6% max ±0.03% typ, ±0.08% max © National Instruments Corporation SCXI-1125 User Manual...
  • Page 85 Appendix D Common Questions Which version of NI-DAQ is needed to work with the SCXI-1125 and how do I get the most current version of NI-DAQ? You must have NI-DAQmx 9.0 or later. Visit and follow the link, ni.com Download Software»Drivers and Updates»Search Drivers and Updates, and type in the keyword to find the latest version of NI-DAQ...

  • Page 86: Table D-2. Digital Signals On The Scxi-1125

    In LabVIEW, can I use the calgnd channel string when the SCXI-1125 is in parallel mode? Yes, you can autozero the SCXI-1125 in LabVIEW when using the module in parallel mode. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 87 Appendix D Common Questions In LabVIEW, can I use a VI to change my filter setting? In NI-DAQmx, you can change the filter settings using a DAQmx Channel property node. In Traditional NI-DAQ (Legacy), there is no VI available to do this.
  • Page 88 Numbers/Symbols ° Degrees  Greater than or equal to  Less than or equal to  Ohms Percent ± Plus or minus +5 V (signal) +5 VDC source signal © National Instruments Corporation SCXI-1125 User Manual...
  • Page 89 Glossary analog-to-digital absolute accuracy The maximum difference between the measured value from a data acquisition device and the true voltage applied to the input, typically specified as ±voltage. alternating current analog-to-digital converter—An electronic device, often an integrated circuit, that converts an analog voltage to a digital number. application development environment—A software environment incorporating the development, debug, and analysis tools for software development.
  • Page 90 Voltage that appears on both inputs of a differential amplifier. cutoff frequency The frequency at which the filter attenuates the input 3 dB, or half of its original power. digital-to-analog D*/A data/Address D GND digital ground signal © National Instruments Corporation SCXI-1125 User Manual...
  • Page 91 Glossary Data acquisition—(1) collecting and measuring electrical signals from sensors, transducers, and test probes or fixtures and inputting them to a computer for processing; (2) collecting and measuring the same kinds of electrical signals with A/D and/or DIO boards plugged into a computer, and possibly generating control signals with D/A and/or DIO boards in the same computer.
  • Page 92 The current that flows into the inputs of a circuit. input impedance The measured resistance and capacitance between the input terminals of a circuit. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 93 Glossary isolation A type of signal conditioning in which you isolate the transducer signals from the computer for safety purposes. Isolating the signals protects you and your computer from large voltage spikes and makes sure the measurements from the DAQ device are not affected by differences in ground potentials.
  • Page 94 NI-DAQ The driver software needed to use National Instruments DAQ devices and SCXI components. noise Analog. Unwanted signals. Noise comes from both external sources, such...
  • Page 95 A rugged, open system for modular instrumentation based on CompactPCI, with special mechanical, electrical, and software features. The PXIbus standard was originally developed by National Instruments in 1997, and is now managed by the PXIbus Systems Alliance. resolution The smallest signal increment that can be detected by a measurement system.
  • Page 96 The relative deformation of an object subjected to stress. Hence, strain is dimensionless. SYNC synchronization pulse for scanning system noise A measure of the amount of noise seen by an analog circuit or an ADC when the analog inputs are grounded. © National Instruments Corporation SCXI-1125 User Manual...
  • Page 97 Glossary thermocouple A temperature sensor created by joining two dissimilar metals. The junction produces a small voltage as a function of the temperature. typical Underwriters Laboratory volts volts direct current virtual instrument—(1) a combination of hardware and/or software elements, typically used with a computer, that has the functionality of a classic standalone instrument (2) a LabVIEW software module (VI), which consists of a front panel user interface and a block diagram program.
  • Page 98 D-3 in PXI combination chassis, 1-5, 3-2 SCXI, 5-25 in SCXI chassis, 1-4, 3-2 virtual, 5-26 connecting with SCXI-1125 for parallel scanning, 1-5 unavailable digital lines, D-2 unused analog input channels, D-2 © National Instruments Corporation SCXI-1125 User Manual...
  • Page 99 Index DC voltage connections. See AC and DC voltage connections input characteristics, A-1 digital lines, unavailability on DAQ installation device, D-2 connecting SCXI-1125 to DAQ device for digital signals on SCXI-1125 (table), D-3 parallel scanning, 1-5 documentation connecting to DAQ device for conventions used in the manual, iv multiplexed scanning in PXI combination chassis, 1-5, 3-2...
  • Page 100 (table), D-3 description, 2-7 front connector pin assignments pin assignments (table), 2-6 figure, 2-8 overview, 2-1 table, 2-8 temperature sensor connection, 2-7 removing SCXI-1125 from Measurement & Automation Explorer, C-1 from SCXI chassis, C-1 © National Instruments Corporation SCXI-1125 User Manual...
  • Page 101 Index software multiplexed scanning operations, 5-24 temperature measurements using LabVIEW and SCXI channel thermocouples, 5-1 string, 5-25 accurate method for temperature LabVIEW and virtual channel determination, 5-2 string, 5-26 guide for calculating overall temperature parallel scanning operations error, 5-3 C and parallel mode, 5-29 overview, 5-1 LabVIEW and parallel mode, 5-28 temperature sensor connection, 2-7...

This manual is also suitable for:

Scxi-1320Scxi-1600777687-20Scxi-1125

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