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National Instruments SCXI-1502 User Manual

National Instruments SCXI-1502 User Manual

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  • Page 1 (217) 352-9330 | Click HERE Find the National Instruments SCXI-1502 at our website:...
  • Page 2 SCXI SCXI-1502 User Manual SCXI-1502 User Manual May 2006 374225A-01...
  • Page 3 Thailand 662 278 6777, 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 ni.com/info and enter the info code feedback.
  • Page 4 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 5 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, AO <3..0>. » The » symbol leads you through nested menu items and dialog box options to a final action.

  • Page 6: Table Of Contents

    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-1502 into an SCXI Chassis or a PXI/SCXI Combination Chassis ..............1-4 Installing the Terminal Block ..................1-4 Verifying the SCXI-1502 Installation in Software ............1-5 Installing SCXI Chassis and Modules in Software .........1-5...
  • Page 7 Analog Circuitry......................4-3 Analog Input Channels..................4-3 Theory of Multiplexed Operation.................. 4-4 Chapter 5 Using the SCXI-1502 Developing Your Application in NI-DAQmx............... 5-1 Typical Program Flowchart ................5-1 General Discussion of Typical Flowchart............5-3 Creating a Task Using DAQ Assistant or Programmatically ... 5-3 Adjusting Timing and Triggering.............
  • Page 8 Figure B-1. Removing the SCXI-1502 ..............B-2 Tables Table 1-1. Supported SCXI-1502 Terminal Blocks ..........1-4 Table 2-1. SCXI-1502 Front Signal Pin Assignments ...........2-2 Table 2-2. Front Connector Signals................2-3 Table 2-3. Rear Signal Pin Assignments ..............2-7 Table 2-4. SCXI-1502 Rear Connector Signals .............2-8 Table 5-1.

  • Page 9: About The Scxi-1502

    Each channel also has an amplifier with a selectable gain of 1 or 100. Each channel of the SCXI-1502 has a lowpass filter with a 5 Hz cutoff frequency to reject 50/60 Hz noise.
  • Page 10 Chapter 1 About the SCXI-1502 • TBX-1303 • TBX-96 – An SCXI chassis or PXI/SCXI combination chassis – One of the following: • E/M Series DAQ device • SCXI-1600 – A computer if using an SCXI chassis – Cabling, cable adapter, and sensors as required for your application ❑...

  • Page 11: National Instruments Documentation

    About the SCXI-1502 National Instruments Documentation The SCXI-1502 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: 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 E/M Series DAQ device to which you will connect the SCXI-1502. NI-DAQ 8.1 or later is required to configure and program the SCXI-1502 module.

  • Page 13: Verifying The Scxi-1502 Installation In Software

    Chapter 1 About the SCXI-1502 Verifying the SCXI-1502 Installation in Software Refer to the SCXI Quick Start Guide for information on verifying the SCXI installation. Installing SCXI Chassis and Modules in Software Refer to the SCXI Quick Start Guide for information on installing chassis and modules using NI-DAQmx in software.
  • Page 14 Chapter 1 About the SCXI-1502 • If you get a Verify SCXI Chassis message box showing the SCXI chassis model number, Chassis ID: x, and the message Slot Number: x Configuration has module: SCXI-XXXX or 1502, hardware in chassis is: SCXI-YYYY, 1502, or Empty, complete the following troubleshooting steps to correct the error.

  • Page 15: Connecting The Signals

    If you are using a custom cable or connector block, refer to the Front Connector section. Front Connector Table 2-1 shows the pin assignments for the SCXI-1502 module front connector. © National Instruments Corporation SCXI-1502 User Manual...

  • Page 16: Table 2-1. Scxi-1502 Front Signal Pin Assignments

    Chapter 2 Connecting the Signals Table 2-1. SCXI-1502 Front Signal Pin Assignments Front Connector Diagram Pin Number Column A Column B Column C CH 0 – CH 0 + Column CH 1 – CH 1 + CH 2 – CH 2 + CH 3 –...

  • Page 17: Front Connector Signal Descriptions

    The common-mode input signal range of an SCXI-1502 module input channel is ±10 V. This common-mode input range for either positive or negative channel input is the maximum input voltage that results in a valid measurement.
  • Page 18 Exceeding the input damage level (±42 VDC powered on or ±25 VDC powered Caution off between input channels and chassis ground) can damage the SCXI-1502 module, the SCXIbus, and the DAQ device. NI is not liable for any injuries resulting from such signal connections.

  • Page 19: Figure 2-1. Ground-Referenced Signal Connection

    Chapter 2 Connecting the Signals CH 0+ CH 0– – – CH 1+ CH 1– – CH 31+ CH 31– – SCXI - 1502 Figure 2-1. Ground-Referenced Signal Connection © National Instruments Corporation SCXI-1502 User Manual...

  • Page 20: Cold-Junction Sensor Connection

    ±15 VDC with power on and off. Exceeding the overvoltage protection on the CJ SENSOR input can damage the Caution SCXI-1502 module, the SCXIbus, and the DAQ device. NI is not liable for any damages or injuries resulting from such signal connections. Rear Signal Connector Table 2-3 shows the SCXI-1502 module rear signal connector pin assignments.

  • Page 21: Table 2-3. Rear Signal Pin Assignments

    33 34 SLOT 0 SEL* 35 36 D GND 37 38 39 40 41 42 AI HOLD COMP, AI HOLD 43 44 SER CLK 45 46 47 48 49 50 NC—No RSVD Connection RSVD © National Instruments Corporation SCXI-1502 User Manual...

  • Page 22: Rear Signal Connector Descriptions

    The analog and communication signals between the DAQ device and the SCXI system are listed in Table 2-4. If the DAQ device is connected to the SCXI-1502, the digital lines are unavailable for general-purpose digital I/O. Table 2-4. SCXI-1502 Rear Connector Signals...

  • Page 23: Connecting Thermocouples

    Chapter 2 Connecting the Signals Table 2-4. SCXI-1502 Rear Connector Signals (Continued) NI-DAQmx SCXI Device Signal Signal Name Name Direction Description SER DAT OUT P0.4 Output Serial data out—this signal taps into the SCXIbus MISO line to accept serial output data from a module.

  • Page 24: Connecting A Current-Loop Receiver

    Chapter 2 Connecting the Signals Connecting a Current-Loop Receiver Measuring current with an SCXI-1502 requires a precision current-sense resistor to convert the current into a voltage. Refer to the SCXI-1308 32-Channel Current Input Installation Guide for more information. SCXI-1502 User Manual 2-10 ni.com...

  • Page 25: Configuring And Testing

    Operation. Otherwise, you should determine the appropriate gain using the input signal voltage range and the full-scale limits of the SCXI-1502 output. You can select a gain of 1 or 100 on a per channel basis. © National Instruments Corporation...

  • Page 26: Input Selection

    Chapter 3 Configuring and Testing Input Selection The front end of the SCXI-1502 includes a software configurable switch that allows you to programmatically connect the input channels of the SCXI-1502 to either the front connector or internal ground. Refer to...

  • Page 27: Creating A Global Channel Or Task

    MAX. Refer to Chapter 4, Theory of Operation, for information on using functions in your application. Dependent upon the terminal block in use, you can use the SCXI-1502 module to make the following types of measurements: • Voltage input •...

  • Page 28: Verifying The Signal

    NI-DAQmx. Verifying the Signal in NI-DAQmx Using a Task or Global Channel You can verify the signals on the SCXI-1502 using NI-DAQmx by completing the following steps: Expand Data Neighborhood.
  • Page 29 After you have completed verifying the channels, click the Stop button. You have now verified the SCXI-1502 configuration and signal connection. For more information on how to further configure the SCXI-1502, or how to use Note LabVIEW to configure the module and take measurements, refer to Chapter 4, Theory of Operation.

  • Page 30: Theory Of Operation

    Theory of Operation This section includes a brief overview and a detailed discussion of the circuit features of the module. Refer to Figure 4-1 while reading this section. © National Instruments Corporation SCXI-1502 User Manual...

  • Page 31: Figure 4-1. Scxi-1502 Module Block Diagram

    Chapter 4 Theory of Operation Rear Signal Connector SCXIbus Connector 32-to-1 Mux Gain 0 Gain 31 Input Protection and Lowpass Filter Front Signal Connector Figure 4-1. SCXI-1502 Module Block Diagram SCXI-1502 User Manual ni.com...

  • Page 32: Rear Signal Connector, Scxibus Connector, And Scxibus Interface

    The SCXI-1502 modules consist of 32 multiplexed input channels, each with a software-programmable gain of 1 or 100. Each input channel has its own lowpass filter. The SCXI-1502 modules also have a digital section for automatic control of channel scanning, temperature sensor selection, gain selection, and auto-zero mode.

  • Page 33: Theory Of Multiplexed Operation

    The temperature sensor is for cold-junction compensation of thermocouple measurements. The CJ SENSOR channel also passes through a 5 Hz lowpass filter to reject unwanted noise on the SCXI-1502. Along with the other 32 input channels, the CJ SENSOR is multiplexed to the output buffer, where it can be read by the DAQ device.
  • Page 34 Chapter 4 Theory of Operation If the scanned SCXI-1502 module is not directly cabled to the DAQ device, the module sends its signals through the SCXIbus to the cabled module. The cabled module, whose routing is controlled by the SCXI chassis, routes the SCXIbus signals to the DAQ device through the AI 0 pin on its rear signal connector.

  • Page 35: Using The Scxi-1502

    8.1 or later of an NI ADE. This section describes how to configure and use NI-DAQmx to control the SCXI-1502 in LabVIEW, LabWindows/CVI, and Measurement Studio. These 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.

  • Page 36: Figure 5-1. Typical Program Flowchart For Voltage Measurement Channels

    Chapter 5 Using the SCXI-1502 Create Task Using DAQ Assistant? Create a Task Programmatically Create Task in DAQ Assistant or MAX Create Channel Create Another Channel? Hardware Timing/Triggering? Further Configure Channels? Adjust Timing Settings Configure Channels Analyze Data? Process Data...

  • Page 37: General Discussion Of Typical Flowchart

    Chapter 5 Using the SCXI-1502 General Discussion of Typical Flowchart The following sections briefly discuss some considerations for a few of the steps in Figure 5-1. These sections are meant to give an overview of some of the options and features available when programming with NI-DAQmx.

  • Page 38: Configuring Channel Properties

    Configuring Channel Properties All ADEs used to configure the SCXI-1502 access an underlying set of NI-DAQmx properties. Table 5-1 shows some of these properties. You can use Table 5-1 to determine what kind of properties you need to set to configure the module for your application.

  • Page 39: Table 5-2. Ni-Daqmx Thermocouple Measurement Properties

    Auto Zero Mode the measured ground voltage from every sample. Analog Input»General Properties» AI.Coupling Specifies the input coupling of Advanced»Input Configuration» the channel. The SCXI-1502 Coupling supports DC and GND coupling. Table 5-2. NI-DAQmx Thermocouple Measurement Properties Property Short Name Description Analog Input»Temperature»...

  • Page 40: Table 5-4. Ni-Daqmx Thermistor Measurement Properties

    Chapter 5 Using the SCXI-1502 Table 5-3. NI-DAQmx RTD Measurement Properties (Continued) Property Short Name Description Analog Input»Temperature» AI.RTD.A Specifies the A, B, or C constant of RTD»Custom»A, B, C AI.RTD.B the Callendar-Van Dusen equation AI.RTD.C when using a custom RTD type.

  • Page 41: Acquiring, Analyzing, And Presenting

    This section describes in more detail the steps shown in the typical program flowchart in Figure 5-1, such as how to create a task in LabVIEW and configure the channels of the SCXI-1502. If you need more information or for further instructions, select Help»VI, Function, & How-To Help from the LabVIEW menu bar.

  • Page 42: Table 5-6. Programming A Task In Labview

    Chapter 5 Using the SCXI-1502 Table 5-6. Programming a Task in LabVIEW Flowchart Step VI or Program Step Create Task in DAQ Assistant Create a located on the DAQmx Task Name Control Controls»All Controls»I/O»DAQmx Name Controls subpalette, right-click it, and select...

  • Page 43: Using A Ni-Daqmx Channel Property Node In Labview

    Chapter 5 Using the SCXI-1502 Table 5-6. Programming a Task in LabVIEW (Continued) Flowchart Step VI or Program Step Display Data You can use graphical tools such as charts, gauges, and graphs to display the data. Some display tools are located on the Controls»All Controls»Numeric»Numeric Indicator...

  • Page 44: Specifying Channel Strings In Ni-Daqmx

    • multiple continuous channels—for example SC1Mod1/ch0:4 (channels 0 through 4) When you have a task containing SCXI-1502 channels, you can set the properties of the channels programmatically using the DAQmx Channel Property Node. Text Based ADEs You can use text based ADEs such as LabWindows/CVI, Measurement Studio, Visual Basic 6, .NET, and C# to create code for using the...
  • Page 45 This example creates a new task and configures an NI-DAQmx voltage measurement channel on the SCXI-1502. You can use the same functions for Visual Basic 6, .NET and C#. The following text is a function prototype example: void AIChannelCollection.CreateVoltageChannel(...

  • Page 46: Programmable Ni-Daqmx Properties

    All of the different ADEs that configure the SCXI-1502 access an underlying set of NI-DAQmx properties. Tables 5-1, 5-2, and 5-3 provide a list of some of the properties that configure the SCXI-1502. You can use this list to determine what kind of properties you need to set to configure the device for your application.

  • Page 47: Calibration

    Chapter 5 Using the SCXI-1502 Calibration The SCXI-1502 is shipped with a calibration certificate and is calibrated at the factory to the specifications described in Appendix A, Specifications. Calibration constants are stored inside the calibration EEPROM and provide software correction values your application development software uses to correct the measurements for both offset and gain errors in the module.
  • Page 48 Specifications This appendix lists the specifications for the SCXI-1502 modules. These specifications are typical at 25 °C unless otherwise noted. Analog Input Input Characteristics Number of channels ....... 32 differential Input coupling ........DC Input signal ranges ......... ±100 mV (gain = 100) or ±10 V (gain = 1)
  • Page 49 Dynamic Characteristics Minimum scan interval (per channel, any gain) ±0.012% accuracy ......3 µs ±0.0061% accuracy ......10 µs ±0.0015% accuracy ......20 µs 25 °C ±10 °C over one year. Assumes 1,000 point average, ±1 °C of autozero temperature. SCXI-1502 User Manual ni.com...
  • Page 50 (gain 1 or 100)........±0.475 ppm/year max ±70 ppm/year typ Power Requirements 5 V supply ..........15 mA max ±15 V supply (regulated from ±24 V supply)....150 mA max V+............18.5 to 25 VDC, 170 mA max © National Instruments Corporation SCXI-1502 User Manual...

  • Page 51: Figure A-1. Scxi-1502 Dimensions

    (1.2 in.) 17.2 cm (6.8 in.) 18.8 cm (7.4 in.) Figure A-1. SCXI-1502 Dimensions Weight ............758 gm (26.7 oz) Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common-mode voltage. Signal + common mode......Each input should remain within ±10 V of CH GND...
  • Page 52 Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, visit , search by model number or product line, and click the ni.com/certification appropriate link in the Certification column. © National Instruments Corporation SCXI-1502 User Manual...
  • Page 53 Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit ni.com/environment/weee.htm SCXI-1502 User Manual...

  • Page 54: Removing The Scxi-1502

    Power off the chassis. Do not remove the SCXI-1502 module from a chassis that is powered on. If the SCXI-1502 is the module cabled to the E /M Series DAQ device, disconnect the cable. Remove any terminal block that connects to the SCXI-1502.
  • Page 55 Appendix B Removing the SCXI-1502 Rotate the thumbscrews that secure the SCXI-1502 to the chassis counterclockwise until they are loose, but do not completely remove the thumbscrews. Remove the SCXI-1502 by pulling steadily on both thumbscrews until the module slides completely out.
  • Page 56 Common Questions This appendix lists common questions related to the use of the SCXI-1502. Which version of NI-DAQ works with the SCXI-1502, and how do I get the most current version of NI-DAQ? You must have NI-DAQ 8.1 or later. Visit the NI Web site at ni.com...
  • Page 57 Which digital lines are unavailable on the E/M Series DAQ device if I am cabled to an SCXI-1502 module? Table C-1 shows the digital lines that are used by the SCXI-1502 for communication and scanning. These lines are unavailable for general-purpose digital I/O if the SCXI-1502 is connected to the E/M Series DAQ device.
  • Page 58 LabVIEW or a test panel in MAX. Which accessories can I use to connect signals to the front of the SCXI-1502 module? Refer to Chapter 1, About the SCXI-1502, for more information. © National Instruments Corporation SCXI-1502 User Manual...
  • Page 59 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. Application development environment. © National Instruments Corporation SCXI-1502 User Manual...
  • Page 60 The group of conductors that interconnect individual circuitry in a computer. Typically, a bus is the expansion interface to which I/O or other devices are connected. Examples of a PC bus is a PCI bus. Celsius. European emissions control standard. SCXI-1502 User Manual ni.com...
  • Page 61 SER DAT IN pulse train transmitted to the SCXI chassis contains data or address information. Decibel—the unit for expressing a logarithmic measure of the ratio of two signal levels: dB = 20log V1/V2, for signals in volts. Direct current. © National Instruments Corporation SCXI-1502 User Manual...
  • Page 62 EXTSTROBE* is used for controlling SCXI chassis, and it is not a general-purpose signal. If you want to use or control this signal, you must perform register-level programming. excitation Supplying a voltage or current source to energize an active sensor or circuit. SCXI-1502 User Manual ni.com...
  • Page 63 Full-scale range. The FSR is the positive full-scale input voltage minus the negative full-scale input voltage. For example, the FSR of the SCXI-1502 for a gain of 1 is +10 V – (–10 V) = 20 V.
  • Page 64 An SCXI operating mode in which analog input channels are multiplexed into one module output so that the cabled E/M Series DAQ device has accessed the module’s multiplexed output as well as the outputs of all other multiplexed modules in the chassis. SCXI-1502 User Manual ni.com...
  • Page 65 Parts per million. PCI eXtensions for Instrumentation–an open specification that builds on the CompactPCI specification by adding instrumentation-specific features. © National Instruments Corporation SCXI-1502 User Manual...
  • Page 66 A device that converts a physical phenomenon into an electrical signal. SER CLK Serial clock signal used to synchronize digital data transfers over the SER DAT IN and SER DAT OUT lines. SER DAT IN Serial data input signal. SCXI-1502 User Manual ni.com...
  • Page 67 Channel names that can be defined outside the application and used without having to perform scaling operations. Volts, input high. Volts, input low. Volts in. Volts, output high. Volts, output low. © National Instruments Corporation SCXI-1502 User Manual...
  • Page 68 The highest voltage with respect to ground that should be applied to an input terminal during normal use, normally well under the breakdown voltage for safety margin. Includes both the signal and common-mode voltages. SCXI-1502 User Manual G-10 ni.com...
  • Page 69 AI HOLD COMP signal (table), 2-7 AI HOLD signal (table), 2-7 AI31– through AI0– signals (table), 2-3 cables, custom, 2-1 AI31+ through AI0+ signals (table), 2-3 calibration, SCXI-1502, 5-13 amplifier characteristics specifications, A-2 CH 0– signal (table), 2-7 analog circuitry CH 0 signal, multiplexing, 2-8...
  • Page 70 NI-DAQmx, 3-2 digital settings, unavailable with DAQ device creating a global channel or connected (table), C-2 task, 3-3 digital signals on the SCXI-1502 (table), C-2 troubleshooting self-test verification, 1-5 documentation verifying signal, 3-4 conventions used in the manual, iv NI-DAQmx, 3-4...
  • Page 71 (figure), 2-6 software, 1-2 ground-referenced signal connection using a NI-DAQmx channel property (figure), 2-5 node, 5-9 LabWindows/CVI, 1-2 creating code for using SCXI-1502, 5-11 hardware getting started, 1-1 removing, B-1 maximum working voltage specifications, A-4 SCXI-1502, 1-1 Measurement & Automation Explorer...
  • Page 72 1-4 front connector (table), 2-2 installation, 1-4 rear signal (table), 2-7 software, C-1 power requirements specifications, A-3 NI-DAQmx power-up state of SCXI-1502, C-2 configurable settings, 3-2 current measurement properties (table), 5-6 questions, common, C-1 developing applications, 5-1 acquiring, analyzing, and...
  • Page 73 Index signal connection floating, referenced to chassis ground safety specifications, A-5 (figure), 2-6 SCXI chassis ground-referenced (figure), 2-5 installing the SCXI-1502 module, 1-4 signal connections SCXI-1502 analog input, 2-3 See also theory of operation digital signals (table), C-2 calibration, 5-13...
  • Page 74 NI-DAQmx, 3-4 rear signal connector, 4-3 troubleshooting, 1-5, C-1 SCXIbus connector, 4-3 Visual Basic SCXIbus interface, 4-3 creating code for the SCXI-1502, 5-10 theory of multiplexed operation, 4-4 thermistor, measurement properties (table), 5-6 thermocouple, measurement properties (table), 5-5 thermocouples, connecting, 2-9...

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