National Instruments Module SCXI-1125 User Manual
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National Instruments Module SCXI-1125 User Manual

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SCXI-1125 User Manual
SCXI-1125 User Manual
April 2008
372425B-01

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Summary of Contents for National Instruments Module SCXI-1125

  • Page 1 SCXI SCXI-1125 User Manual SCXI-1125 User Manual April 2008 372425B-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 Signal Conditioning Technical Support Information document. To comment on National Instruments documentation, refer to the National Instruments Web site at ni.com/info and enter the info code feedback.

  • Page 3: Important Information

    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>. » The » symbol leads you through nested menu items and dialog box options to a final action.

  • Page 5: Table Of Contents

    Chapter 1 About the SCXI-1125 What You Need to Get Started ...1-1 National Instruments Documentation ...1-2 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 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 Series DAQ Device for Multiplexed Scanning ... 3-2 Connecting the SCXI-1125 in a PXI/SCXI Combination Chassis to an E/M 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 Contents 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 Contents SCXI-1125 User Manual...

  • Page 10: About The Scxi-1125

    (CJC) channel that you can scan in multiplexed mode. What You Need to Get Started To set up and use the SCXI-1125 module, you need the following: ❑ © National Instruments Corporation Hardware – SCXI-1125 module –...

  • Page 11: National Instruments Documentation

    Terminal Block Maximum ❑ ❑ National Instruments Documentation The SCXI-1125 User Manual is one piece of the documentation set for data acquisition (DAQ) systems. You could have any of several types of manuals depending on the hardware and software in the system. Use the manuals you have as follows: •...
  • Page 12 E/M Series DAQ device, and application hints. 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: Or Later

    Chapter 1 About the SCXI-1125 Installing Application Software, NI-DAQ, and the DAQ Device Refer to the DAQ Getting Started Guide packaged with the NI-DAQ software to install your application software, NI-DAQ driver software, and the DAQ device to which you will connect the SCXI-1125. NI-DAQ 7.0 or later is required to configure and program the SCXI-1125 module.

  • Page 14: Connecting The Scxi-1125 To A N E/M Series Daq Device For Parallel Scanning

    Installing SCXI Using NI-DAQmx in Software Refer to the SCXI Quick Start Guide for information on installing modules using NI-DAQmx in software. © National Instruments Corporation Power off the SCXI chassis and the computer that contains the E/M Series DAQ device.

  • Page 15: Manually Adding Modules In Ni-Daqmx

    Chapter 1 About the SCXI-1125 Manually Adding Modules in NI-DAQmx If you did not auto-detect the SCXI modules, you must manually add each of the modules. Refer to the SCXI Quick Start Guide to manually add modules. Note NI recommends auto-detecting modules for the first time configuration of the chassis.

  • Page 16: Chapter 5 Using The

    Troubleshooting in NI-DAQmx • • © National Instruments Corporation If you get a Verify SCXI Chassis message box showing the SCXI chassis model number, Chassis ID: x, and one or more messages stating Slot Number: x Configuration has module: SCXI-XXXX...
  • Page 17 Chapter 1 About the SCXI-1125 • • If these measures do not successfully configure the SCXI system, contact NI. Refer to the Signal Conditioning Technical Support Information document for contact information. SCXI-1125 User Manual module following the steps listed in the SCXI Quick Start Guide.

  • Page 18: Connecting Signals

    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 connections to each channel are fully floating with respect to ground and © National Instruments Corporation SCXI-1125, contains a list of SCXI-1125-compatible terminal blocks. About...

  • Page 19: Ground-Referenced Signal

    Chapter 2 Connecting Signals 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. Ground-Referenced Signal When the negative input signal line is connected either directly or indirectly to earth ground (usually at the transducer end), connect this line to the negative input terminal, as shown in Figure 2-1.

  • Page 20: Floating Signal

    Figure 2-2, the noise can couple to the chassis ground through the amplifier and exhibit a differential mode signal that can be amplified by the amplifier. Connecting the signal to chassis ground breaks the isolation barrier. © National Instruments Corporation – Module Figure 2-2. Connecting a Floating Signal...

  • 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 section. Hooking up external signals to these pins can Chapter 2 Connecting Signals...

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

    Chapter 2 Connecting Signals Front Connector Diagram Column NC means no connection — means no pin SCXI-1125 User Manual Table 2-1. Front Signal Pin Assignments Pin Number Column A AI 0 + — AI 1 + — — AI 2 + —...

  • Page 24: Temperature Sensor Connection

    If the E/M 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 Chapter 2 Connecting Signals SCXI-1125 User Manual...

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

    Chapter 2 Connecting Signals Rear Connector Diagram Signal Name AI GND CH 0 + CH 1 + CH 2 + CH 3 + 11 12 CH 4 + 13 14 CH 5 + 15 16 17 18 CH 6 + 19 20 CH 7 + 21 22...

  • Page 26: Configuring And Testing

    E/M Series DAQ device. In most applications NI-DAQ chooses and sets the gain for you determined by the input range. © National Instruments Corporation Theory of Theory of Operation, for a...

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

    Chapter 3 Configuring and Testing Connecting the SCXI-1125 in an SCXI Chassis to an E/M 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 Connecting the SCXI-1125 in a PXI/SCXI Combination Chassis to an...

  • Page 28: Ni-Daqmx

    Traditional NI-DAQ (Legacy). Creating a Voltage Global Channel or Task To create a new NI-DAQmx global task or channel, complete the following steps: © National Instruments Corporation Task or global channel in MAX Functions in your application Theory of Filter bandwidth—configure the Device tab using either NI-DAQmx...

  • Page 29: Traditional Ni-Daq (Legacy)

    Chapter 3 Configuring and Testing 10. Click the Device tab and select the autozero mode and lowpass filter 11. If you are creating a task and want to set timing or triggering controls, Traditional NI-DAQ (Legacy) In Traditional NI-DAQ (Legacy), you can configure software settings, such as configuration, voltage excitation level, filter bandwidth, gain/input signal range, and calibration settings in the following three ways: •...

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

    1 through 4. Test the system following the steps in the section of Chapter 1, © National Instruments Corporation Gain/input signal range—configure gain using module properties. When you set the minimum and maximum range of the virtual channel, the driver selects the best gain.

  • Page 31: Creating A Virtual Channel

    Chapter 3 Configuring and Testing Creating a Virtual Channel To create a virtual channel, complete the following steps: 10. What DAQ hardware will be used? from the drop-down list. 11. Click Finish. Verifying the Signal This section describes how to take measurements using test panels in order to verify signal, and configuring and installing a system in NI-DAQmx and Traditional NI-DAQ (Legacy).

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

    • • • Use the format single input channel. © National Instruments Corporation Click the Device tab. Enter the appropriate information on the Device tab. button. obx ! scy ! mdz ! channel obx is the onboard E Series DAQ device channel, with x representing a particular channel where the multiplexed channels are sent.

  • Page 33: Verifying The Signal Using Virtual Channel

    Chapter 3 Configuring and Testing Complete the following steps to use channel strings in verifying the signal: Refer to the LabVIEW Measurements Manual for more information and for proper formatting of channel strings for different uses. Verifying the Signal Using Virtual Channel If you have already created a virtual channel, complete the following steps to verify the signal: SCXI-1125 User Manual...

  • Page 34: Theory Of Operation

    The SCXI-1125 has 12 different gain settings, from 1 to 2000, enabling signal ranges ±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, © National Instruments Corporation Lowpass AI 0 Filter...

  • Page 35: Filter Bandwidth And Cutoff Frequency

    Chapter 1, 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

    E/M Series DAQ device. The CJC channel is not accessible. Every SCXI-1125 configured for parallel mode must have a E/M Series DAQ device directly cabled to it. © National Instruments Corporation Questions, for more information on available pins on the rear signal About the SCXI-1125.

  • Page 37: Theory Of Parallel Hardware Operation

    Chapter 4 Theory of Operation Theory of Parallel Hardware Operation In parallel mode, the CH0 signal on the rear signal connector is configured as the output of the SCXI-1125 analog input channel 0. The rear signal connector carries each of the analog outputs of the SCXI-1125 to the connected 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...
  • Page 40 Complete the following steps to calculate the overall temperature error using the SCXI-1125 with an E Series MIO DAQ device: © National Instruments Corporation Based on the required temperature range and the type of sensor, determine the gain to use. For example, using a K-type thermocouple with a required temperature range of 0 to 100 °C, the corresponding...

  • 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

    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 Table 5-2. Extended Gain and Range Using the TBX-1316 Overall...

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

    Chapter 5 Using the SCXI-1125 Create Task in DAQ Assistant or MAX Further Configure Channels? Configure Channels Start Measurement Read Measurement SCXI-1125 User Manual Y es Create Task Using DAQ Assistant? Create Another Channel? Clear Task Figure 5-1. Typical Program Flowchart Create a Task Programmatically Create Channel...

  • Page 44: General Discussion Of Typical Flowchart

    When programmatically adjusting timing settings, you can set the task to acquire continuously, acquire a buffer of samples, or acquire one point at a © National Instruments Corporation Chapter 5 Using the SCXI-1125...

  • Page 45: Configuring Channel Properties

    Chapter 5 Using the SCXI-1125 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. For continuous and buffered acquisitions, you can set the acquisition rate and the number of samples to read in the DAQ Assistant or programmatically in your application.

  • Page 46: Acquiring, Analyzing, And Presenting

    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 Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual...

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

    Chapter 5 Using the SCXI-1125 Flowchart Step Create Task in DAQ Assistant Create a Task Programmatically (optional) Create AI Channel (optional) Adjust Timing Settings (optional) Configure Channels (optional) Start Measurement Read Measurement Analyze Data SCXI-1125 User Manual Table 5-4. Programming a Task in LabVIEW VI or Program Step Create a DAQmx Task Name Constant...

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

    Note If you do not use Active Channels, the properties are set on all of the channels in the task. © National Instruments Corporation VI or Program Step You can use graphical tools such as charts, gauges, and graphs to display your data. Some display tools are located on the Controls»All Controls»Numeric»Numeric Indicators...

  • Page 49: Specifying Channel Strings In Ni-Daqmx

    Chapter 5 Using the SCXI-1125 Figure 5-2. LabVIEW Channel Property Node with Lowpass Frequency Set at 10 kHz Note Refer to the LabVIEW Help for information about property nodes and specific NI-DAQmx properties. Specifying Channel Strings in NI-DAQmx Use the channel input of DAQmx Create Channel to specify the SCXI-1125 channels.
  • Page 50 LabVIEW property node, complete the following steps: Note Refer to the LabVIEW Help for information about property nodes and specific NI-DAQmx properties. © National Instruments Corporation Launch LabVIEW. Create the property node in a new Virtual Instrument (VI) or in an existing VI.

  • 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 Table 5-5. NI-DAQmx Properties Short Name AI.Max AI.Min...

  • 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

    Figure 5-3. Virtual Channel Create Virtual Channel in MAX Figure 5-3. Typical SCXI-1125 Program Flow with Traditional NI-DAQ (Legacy) © National Instruments Corporation SCXI Channel String Virtual Channel or SCXI Channel String Configure...

  • 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

    Measurements Manual. You also can use the LabVIEW Help for more detailed information about the various inputs and outputs of these functions. © National Instruments Corporation Figure 5-4. Using the AI Parameter VI to Set Up the SCXI-1125 5-19 Chapter 5...

  • 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»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»Programs»National Instruments»NI-DAQ. SCXI-1125 User Manual Table 5-7. Configuration Functions Description...

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

    After acquiring data using organized by channel, so you should demultiplex the data using SCAN_Demux SCAN_Op © National Instruments Corporation Significant Parameters f64 gain (gain setting) f64 freq...

  • 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»Programs»National Instruments» NI-DAQ. Perform Scaling, Analysis, and Display After acquiring raw voltage data from the acquisition functions, most applications require adjustment by device calibration constants for accuracy, scaling measured voltage, analysis, and graphical display.

  • Page 62: Labview And The Scxi Channel String

    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 obx ! scy ! mdz ! channels obx is the onboard E Series DAQ device channel, with x representing a particular channel where the multiplexed channels are sent.

  • 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: • • • • • Note Repeating channels or having channels out of sequence in a scan list is not supported on all SCXI modules.

  • Page 64: Performing A Multiplexed Scan

    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 Open an analog input example in your ADE. Enter the appropriate SCXI channel string or virtual channel string into the channels parameter.

  • 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: You are now ready to acquire the channel data with the E Series DAQ device.

  • Page 66: C And Parallel Mode

    Many example programs ship with NI-DAQ. For more example information on how to create tasks and channels, refer to the example programs. By default, the example programs are installed in Files\National Instruments\CVI x . x \Samples are installed by default in 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

    To perform offset calibration on your module, follow this procedure if you are using LabVIEW: © National Instruments Corporation Make sure the DAQ device or DMM you are using has a valid calibration and meets the accuracy specifications for your application.

  • Page 69: Two-Point Gain And Offset Calibration

    Chapter 5 Using the SCXI-1125 If you are using a C-based ADE, use the following procedure to do an offset calibration on the SCXI-1125: The SCXI-1125 may take a few seconds to perform the calibration. After completion, your module will have new calibration constants stored for the channels and gains you calibrated.

  • Page 70: Specifications

    25 °C unless otherwise noted. Input Characteristics Overall Gain Refer to Tables 5-1 and 5-2 for extended range using the SCXI-1313A, SCXI-1327, Note and TBX-1316. © National Instruments Corporation Table A-1. Input Signal Range Versus Gain Overall Voltage Range ±5 V or VDC peak ±2.5 V...
  • Page 71 Appendix A Specifications Overvoltage protection SCXI-1125 User Manual 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 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: Analog Inputs

    Bandwidth (–3dB cut-off frequency) Slew rate Scan interval accuracy Common Mode Rejection Ratio, 50/60 Hz (CMRR) © National Instruments Corporation Normal powered on ... >1 G || 100 pF in parallel Powered off/overload... 4.5 M With SCXI-1327 ... 1 M With TBX-1316 ...

  • Page 75: Power Consumption

    Appendix A Specifications Normal Mode Rejection, 50/60 Hz (NMRR) Crosstalk at 1kHz Input coupling Power Consumption +18.5 V ...140 mA max – 18.5 V ...140 mA max +5 V ...10 mA max Output Characteristics Output range ...±5.0 V Output impedance Transfer Characteristics Nonlinearity Stability...

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

    Appendix A Specifications 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 Module Signal Range...

  • Page 78: Electromagnetic Compatibility

    To obtain the DoC for this product, visit , search by model number or product line, and click the appropriate link certification in the Certification column. © National Instruments Corporation IEC 61010-1, EN-61010-1 UL 61010-1, CSA 61010-1 EN 61326 EMC requirements; Minimum Immunity EN 55011 Emissions;...

  • Page 79: Environmental Management

    Waste Electrical and Electronic Equipment (WEEE) At the end of their life cycle, all products must be sent to a WEEE recycling EU Customers center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit National Instruments...
  • Page 80 • • • © National Instruments Corporation is the onboard E/M Series DAQ device channel, with ob x representing a particular channel where the multiplexed channels are sent. This value is 0 for E/M Series DAQ device channel 0 in a single-chassis system.
  • Page 81 Appendix B Using SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or Later channels several formats: • • • • Notes Using parenthesis surrounding multiple channels in a channel string is important for correct scanning operation of the SCXI channels. In a single-chassis system, the module and E/M Series DAQ device to be automatically set to fit the input limits parameter.

  • Page 82: Removing The Scxi-1125

    Consult the documentation for the chassis and accessories for additional instructions and precautions. To remove the SCXI-1125 module from an chassis, complete the following steps while referring to Figure C-1: © National Instruments Corporation Expand Devices and Interfaces to display the list of installed devices and interfaces.

  • Page 83: Appendix C Removing The

    Appendix C Removing the SCXI-1125 1 Cable 2 SCXI Module Thumbscrews 3 SCXI-1125 4 Sensor SCXI-1125 User Manual If the SCXI-1125 is the module cabled to the E 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: Common Questions

    D TEMP (direct channel) Offset error ±6 µV ± 3 mV/gain Gain error ±0.2% typ, ±0.6% max © National Instruments Corporation SCXI-1120 ±5 V, ±300 V with SCXI-1327, ±1000 VDC with TBX-1316 250 V 1, 2, 5, 10, 20, 50, 100, 200, 250, 500,...
  • 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-DAQ 7.0 or later. Visit Download Software»Drivers and Updates»Search Drivers and Updates, and type in the keyword NI-DAQ for your operating system.

  • 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 Table D-2. Digital Signals on the SCXI-1125 SCXI Signal 50-Pin...
  • 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 Greater than or equal to. ≤ Less than or equal to. Ω Ohms. Per. Percent. ± Plus or minus. +5 V (signal) +5 VDC source signal. © National Instruments Corporation Value – 12 – 9 – 6 – 3 tera 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 Glossary 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 Glossary 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 Glossary 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 PC, that has the functionality of a classic stand-alone instrument (2) a LabVIEW software module (VI), which consists of a front panel user interface and a block diagram program.
  • Page 98 SCXI, 5-25 virtual, 5-26 channels C language scanning, D-4 questions about, D-3 unused analog input channels on DAQ device, D-2 © National Instruments Corporation common questions, D-1 configuration troubleshooting self-test verification, 1-7 configuration settings filter bandwidth, 3-1, 4-2 gain, 3-1, 4-1...
  • Page 99 Index digital lines, unavailability on DAQ device, digital signals on SCXI-1125 (table), D-3 documentation conventions used in the manual, iv electromagnetic compatibility specifications, A-9 environmental specifications, A-8 filter setting, changing, D-4 filters bandwidth configuration, 3-1, 4-2 floating signal connections AC-coupled signal connection (figure), 2-4 description, 2-3 front signal connector...
  • Page 100 PXI combination chassis, 1-4, 3-2 rear signal connector description, 2-7 pin assignments figure, 2-8 table, 2-8 regulatory compliance specifications, A-9 © National Instruments Corporation removing SCXI-1125 from Measurement & Automation Explorer, C-1 from SCXI chassis, C-1 safety specifications, A-9 SCXI channel string, 5-25...
  • Page 101 Index front connector pin assignments (table), 2-6 overview, 2-1 temperature sensor connection, 2-7 software multiplexed scanning operations, 5-24 LabVIEW and SCXI channel string, 5-25 LabVIEW and virtual channel string, 5-26 parallel scanning operations C and parallel mode, 5-29 LabVIEW and parallel mode, 5-28 specifications electromagnetic compatibility, A-9 environmental, A-8...

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