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National Instruments SCXI-1530 User Manual

National Instruments SCXI-1530 User Manual

Icp accelerometer conditioning module
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SCXI
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SCXI-1530/1531
User Manual
ICP Accelerometer Conditioning Module
SCXI-1530/1531 User Manual
June 2000 Edition
Part Number 322642A-01

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  • Page 1 SCXI ™ SCXI-1530/1531 User Manual ICP Accelerometer Conditioning Module SCXI-1530/1531 User Manual June 2000 Edition Part Number 322642A-01...
  • Page 2 Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545 For further support information, see the Technical Support Resources appendix. To comment on the documentation, send e-mail to techpubs@ni.com © Copyright 2000 National Instruments Corporation. All rights reserved.
  • Page 3 Warranty The SCXI-1530 and SCXI-1531 are warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period.
  • Page 4 Classification requirements are the same for the Federal Communications Commission (FCC) and the Canadian Department of Communications (DOC). Changes or modifications not expressly approved by National Instruments could void the user’s authority to operate the equipment under the FCC Rules.
  • Page 5 • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
  • Page 6 Conventions The following conventions are used in this manual: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box.

  • Page 7: Table Of Contents

    About the SCXI-1530/1531 ...................1-1 Installing the Software ....................1-1 Installing the SCXI-1530/1531 ..................1-2 Unpacking......................1-2 Installing the SCXI-1530/1531 Module into the SCXI Chassis......1-2 Connecting the SCXI-1530/1531 to a DAQ Device for Multiplexed Scanning in an SCXI Chassis...........1-4 Connecting the SCXI-1530/1531 to a DAQ Device for Multiplexed Scanning in a PXI Combination Chassis .........1-5...
  • Page 8 Figure 1-3. Removing the SCXI-1530/1531 ............1-13 Figure 2-1. Typical Current-Excited Accelerometer ..........2-2 Figure 2-2. SCXI-1530/1531 Module Block Diagram ..........2-3 Figure 2-3. SCXI-1530/1531 BNC Connector Assignments ........2-4 Figure 2-4. SCXI-1530/1531 Rear Signal Connector..........2-7 SCXI-1530/1531 User Manual viii www.ni.com...
  • Page 9 Contents Tables Table 2-1. Gain Values and Input Limits ...............2-14 Table B-1. Digital Signals on the SCXI-1530/1531..........B-3 © National Instruments Corporation SCXI-1530/1531 User Manual...

  • Page 10: Installing And Configuring The Scxi-1530/1531

    SCXI-1530/1531, including the latest version of NI-DAQ. After installing the software, install any DAQ devices and the SCXI-1530/1531 hardware, and then configure and test the SCXI-1530/1531 to ensure that the installation is complete. Installing the Software You can control the SCXI-1530/1531 in an application development environment (ADE) using the NI-DAQ device driver software.

  • Page 11: Installing The Scxi-1530/1531

    The following instructions describe how to install the software for your SCXI-1530/1531: Install your ADE if you have not already done so. National Instruments ADEs have release notes containing software installation instructions. Install the NI-DAQ software provided with your DAQ device. NI-DAQ version 6.7 or higher is required to configure and program your...

  • Page 12: Figure 1-1. Installing The Scxi-1530/1531 Module

    Turn off the SCXI chassis. Caution Do not insert the SCXI-1530/1531 module into a chassis that is turned on. Insert the SCXI-1530/1531 into an open slot in the SCXI chassis. Gently guide the module into the slot guides and push it to the back of the slot until the front face of the module is flush with the front of the chassis.

  • Page 13: Connecting The Scxi-1530/1531 To A Daq Device For Multiplexed Scanning In An Scxi Chassis

    Connecting the SCXI-1530/1531 to a DAQ Device for Multiplexed Scanning in an SCXI Chassis With this configuration, you can multiplex all eight input channels of the SCXI-1530/1531 into a single channel of your DAQ device. You need the following items for this installation: •...

  • Page 14: Connecting The Scxi-1530/1531 To A Daq Device For Multiplexed Scanning In A Pxi Combination Chassis

    Scanning in a PXI Combination Chassis With this configuration, you can multiplex all four or eight channels of your SCXI-1530/1531 into a single channel of your DAQ device in a combination PXI chassis. You need the following items for this installation: •...

  • Page 15: Connecting The Scxi-1530/1531 To A Daq Device For Parallel Scanning

    No cables are required between the SCXI-1530/1531 and DAQ device if the National Instruments PXI E Series DAQ device is installed in the right-most slot. You can configure this device to control the SCXI system using an internal bus that connects the PXI chassis to the SCXI chassis.

  • Page 16: Configuration And Self-Test

    Figure 1-2: Turn off the SCXI chassis and the computer that has the DAQ device. Insert the cable adapter into the rear of the SCXI-1530/1531 module accessed in parallel mode by the DAQ device. See the installation guide for your cable assembly for more information.

  • Page 17: Auto-Detecting Modules

    Chapter 1 Installing and Configuring the SCXI-1530/1531 Configure the chassis by selecting a Chassis ID. This is an integer value you choose to uniquely identify the chassis for programming and scanning. Select the Chassis Address to address the chassis in a multichassis SCXI system.

  • Page 18: Manually Adding Modules

    SCXI custom module, you may be using the wrong version of NI-DAQ. If you do not have NI-DAQ version 6.7 or higher, you can either contact a National Instruments sales representative or download the latest NI-DAQ version from www.ni.com...

  • Page 19: Configuring The Scxi-1530/1531

    Select the appropriate gain, filter, and current source settings for each channel on the SCXI-1530/1531. Click Next. If you need to manually install more SCXI-1530/1531 modules in your chassis, repeat steps 3 through 5 to configure each module. Configuring the SCXI-1530/1531 To configure your SCXI-1530/1531 after auto-detection or to alter your original configuration selections, use the Measurement &...

  • Page 20: Self-Test Verification

    Make sure the cable between the SCXI chassis and DAQ device is properly connected. Inspect the cable connectors for any bent pins. Make sure you are using the correct National Instruments cable assembly. Test your DAQ device to verify it is working properly. See your DAQ device user manual for more information.

  • Page 21: Removing The Scxi-1530/1531

    Return to Self-Test Verification and retest your SCXI chassis. Removing the SCXI-1530/1531 This section describes how to remove the SCXI-1530/1531 from an SCXI chassis. Removing the SCXI-1530/1531 from an SCXI Chassis Please read Safety Information found in this chapter before disconnecting signals or removing the SCXI-1530/1531 from the chassis.
  • Page 22 Remove any accelerometer cables connected to the SCXI-1530/1531. Turn off the SCXI chassis power. Do not remove the SCXI-1530/1531 module from a chassis that is powered on. Loosen, but do not completely remove, the thumbscrews securing the SCXI-1530/1531 to the chassis by turning them counter-clockwise.

  • Page 23: Removing The Scxi-1530/1531 From Measurement & Automation Explorer

    Chapter 1 Installing and Configuring the SCXI-1530/1531 Removing the SCXI-1530/1531 from Measurement & Automation Explorer To remove a module from the Measurement & Automation Explorer utility, follow these steps: Double-click the Measurement & Automation Explorer icon. Click + next to the Devices and Interfaces icon to display the list of installed devices and interfaces.
  • Page 24 Connections, including power signals to ground and vice versa, that exceed any of the maximum signal ratings on the SCXI-1530/1531 can damage any or all of the modules in the same SCXI chassis, the host computer, and the SCXI-1530/1531 module itself.

  • Page 25: Using The Scxi-1530/1531

    Using the SCXI-1530/1531 This chapter describes how to take measurements using the SCXI-1530/1531. The two major modes of operation, multiplexed and parallel, are described, along with how to connect signal sources to the SCXI-1530/1531. Calibration is also described. Accelerometer Design A typical current-excited accelerometer is shown in Figure 2-1.

  • Page 26: Scxi-1530/1530 Signal Conditioning

    Figure 2-1. Typical Current-Excited Accelerometer SCXI-1530/1530 Signal Conditioning A block diagram of the SCXI-1530/1531 is shown in Figure 2-2. The accelerometer is energized by the current source. You can disable the current source to measure noise in the system. There is also a ground switch that you can turn on or off in software to accommodate both ground-referenced and non-referenced accelerometers.

  • Page 27: Making Signal Connections

    Calibration EEPROM Figure 2-2. SCXI-1530/1531 Module Block Diagram Making Signal Connections This section recommends how to connect signals to the SCXI-1530/1531. With the SCXI-1530/1531 modules, you can make precise acceleration measurements using current-excited accelerometers, such as ICP accelerometers. The floating (non-referenced) current sources provide excitation for the accelerometers.

  • Page 28: Accelerometer Connections

    Chapter 2 Using the SCXI-1530/1531 Accelerometer Connections Input signal connections to the SCXI-1530/1531 are made through the front BNC connectors. The channel assignment for the SCXI-1530/1531 front BNC connectors is shown in Figure 2-3. SCXI-1530 SCXI-1531 4-CHANNEL 8-CHANNEL ACCELEROMETER ACCELEROMETER...

  • Page 29: Ground-Referenced Transducer

    For example, if you are using three channels and their filter bandwidths are 2.5, 2.5, and 5.0 kHz, your minimum scan rate is 50 kHz. The maximum scan rate for the SCXI-1530/1531 module in multiplexed mode is determined by the formula: ----------------------------------------------- - 8 µs...

  • Page 30: Operating In Multiplexed Mode

    Installing and Configuring the SCXI-1530/1531. In multiplexed mode, you can multiplex all input channels of the SCXI-1530/1531 into one output channel that is read by the National Instruments DAQ device. Theory of Multiplexed Hardware Operation When you configure a module for multiplexed mode operation, the multiplexed signals routed to the DAQ device depend on which module is cabled to the DAQ device in the SCXI system.

  • Page 31: Figure 2-4. Scxi-1530/1531 Rear Signal Connector

    512 channels per chassis. You can randomly scan the channels on the SCXI-1530/1531. The channels can be in any order and the channels can occur multiple times in a single scan. When performing multiple scans, the list pointer of the module automatically wraps around and starts scanning with the first channel in the scan list.

  • Page 32: Using Software For Multiplexed Scanning

    Chapter 2 Using the SCXI-1530/1531 Using Software for Multiplexed Scanning Performing scanning operations in software depends on the ADE you are using. While using LabVIEW, Measure, or Visual Basic (ComponentWorks), all scanning operations are prepared in the software using an SCXI channel string as the input to the channel parameter in the analog input VI or function.

  • Page 33: Labview And The Virtual Channel String

    If the scaling changes or you want to connect a different transducer to your SCXI-1530/1531, no changes are needed in the application. You can create a different virtual channel using its name in the channel string.

  • Page 34: Performing A Multiplexed Scan Using Scxi Or Virtual Channel Strings

    When using virtual channels, the default limits configured in the virtual channel configurator are used. You have completed a multiplexed scan using your SCXI-1530/1531. This is not a comprehensive discussion of SCXI scanning using LabVIEW, BridgeVIEW, Measure, or ComponentWorks, but should give you enough information to help you get started with the examples that are shipped with these software packages.

  • Page 35: C And Low-Level Daq Functions

    . Refer to the NI-DAQ User Manual for additional SCXI_Scale information on scanning with DAQ devices. Operating in Parallel Mode You can configure the SCXI-1530/1531 to operate in parallel mode as described in Configuring the SCXI-1530/1531 of Chapter 1, Installing and Configuring the SCXI-1530/1531.

  • Page 36: Using Software For Parallel Scanning

    The advantage to using parallel mode is that you are bypassing scanning and are not limited by the settling time required by the multiplexer of the SCXI-1530/1531 module. Using this mode, you may be able to scan the channels more accurately and at a faster rate, depending upon which DAQ device you connect to your module.

  • Page 37: Calibration

    Chapter 2 Using the SCXI-1530/1531 SCXI-1530/1531 for proper operation. You can use any of the DAQ device analog input functions to get the data from the four or eight channels of the SCXI module. After scanning, convert the binary data to voltage data by using .
  • Page 38 Since offset varies with gain, enter the gain setting for which you are calibrating offset. Repeat step 2 for calibrating additional channels. The SCXI-1530/1531 may take a few seconds to perform the calibration. After completion, your module has new calibration constants stored for the channels and gains calibrated.
  • Page 39 Specifications This appendix lists the specifications for the SCXI-1530/1531 modules. These specifications are typical at 25 °C unless otherwise noted. Inputs Number of input channels SCXI-1530 ........4 SCXI-1531 ........8 Amplifier input impedance both powered on and off ......1 MΩ...

  • Page 40: Appendix A Specifications

    ±0.5 dB 0.8 f ±0.7 dB 1.0 f ±0.7 dB Interchannel phase error Frequency Phase Error 0.01 f ±0.08° 0.1 f ±0.73° 0.5 f ±3.6° 0.8 f ±5.8° 1.0 f ±7.2° Nonlinearity ..........0.004% of FSR max SCXI-1530/1531 User Manual www.ni.com...
  • Page 41 Front connectors........BNC (female) Rear connectors........50-pin male ribbon 96-pin female SCXIbus Environment Operating temperature......0 to 50 °C Storage temperature ....... –20 to 70 °C Relative humidity ........10 to 90% noncondensing © National Instruments Corporation SCXI-1530/1531 User Manual...
  • Page 42 C22.2 No. 1010.1 for electrical measuring and test equipment. Approved at altitudes up to 2000 meters. Installation Category II Pollution Degree 2 Category II refers to local-level power distribution, such as that provided by a standard wall outlet. SCXI-1530/1531 User Manual www.ni.com...

  • Page 43: Appendix B Common Questions

    This appendix lists common questions related to the use of the SCXI-1530/1531 modules. What is the difference between the SCXI-1530 and SCXI-1531? The SCXI-1530 has four input channels. The SCXI-1531 has eight input channels. Are there any cabling restrictions when using an SCXI-1530/1531 module with a plug-in E Series DAQ device? Yes.
  • Page 44 Updates»Search Drivers and Updates, and type in the keyword NI-DAQ to find the latest version of NI-DAQ for your operating system. Can I use the SCXI-1530/1531 with a version of NI-DAQ that works under the Macintosh Operating System (MacOS)? At the time this manual was printed, no.
  • Page 45 Which digital lines are unavailable on the DAQ device if it is connected directly to an SCXI-1530/1531 module? Table B-1 shows the digital lines that are used by the SCXI-1530/1531 for communication and scanning. These lines are unavailable for general-purpose digital I/O if the SCXI-1530/1531 is connected to the DAQ device.
  • Page 46 SCXI-1530/1531 modules in multiplexed mode? The minimum scan time is 8 µs + 3 µs (N – 1) where N is the number of SCXI-1530/1531 channels to scan. The maximum scan rate is 1 divided by the minimum scan time.

  • Page 47: Technical Support Resources

    Technical Support Resources This appendix describes the comprehensive resources available to you in the Technical Support section of the National Instruments Web site and provides technical support telephone numbers for you to use if you have trouble connecting to our Web site or if you do not have internet access.
  • Page 48 If you have trouble connecting to our Web site, please contact your local National Instruments office or the source from which you purchased your National Instruments product(s) to obtain support. For telephone support in the United States, dial 512 795 8248. For...

  • Page 49: Glossary

    AC signals while blocking DC signals acquisition time the time required by a sample-and-hold system to switch from hold mode back to tracking mode analog-to-digital application development environment such as LabVIEW, LabWindows/CVI, BridgeVIEW, Visual Basic, C, and C++ © National Instruments Corporation SCXI-1530/1531 User Manual...
  • Page 50 (dB) common-mode voltage code width the smallest detectable change in an input voltage of a DAQ device SCXI-1530/1531 User Manual www.ni.com...
  • Page 51 Some SCXI modules contain an EEPROM to store measurement-correction coefficients. electromechanical compliance electromagnetic interference excitation supplying a voltage or current source to energize an active sensor or circuit © National Instruments Corporation SCXI-1530/1531 User Manual...
  • Page 52 SCXI-1530/1531 User Manual www.ni.com...
  • Page 53 (signal) NI-DAQ National Instruments driver software for DAQ hardware © National Instruments Corporation SCXI-1530/1531 User Manual...
  • Page 54 For example, a system has 12-bit resolution, one part in 4,096 resolution, and 0.0244% of full scale resolution. root mean square—The square root of the average value of the square of the instantaneous signal amplitude; a measure of signal amplitude. rear signal connector SCXI-1530/1531 User Manual www.ni.com...
  • Page 55 © National Instruments Corporation SCXI-1530/1531 User Manual...
  • Page 56 (2) a LabVIEW software module (VI), which consists of a front panel user interface and a block diagram program virtual channels channel names that can be defined outside the application and used without having to perform scaling operations volts, root mean square SCXI-1530/1531 User Manual www.ni.com...

  • Page 57: Index

    1-7 to 1-8 accelerometer troubleshooting self-test verification, BNC connector assignments (figure), 2-4 1-11 to 1-12 current excitation, 2-5 connecting SCXI-1530/1531 to DAQ device. design, 2-1 to 2-2 See DAQ device. determining scan rate, 2-5 to 2-6 connectors floating (non-referenced) transducer, 2-5...
  • Page 58 SCXI chassis, 1-2 to 1-4 theory of multiplexed hardware software installation, 1-1 to 1-2 operation, 2-6 to 2-7 unpacking SCXI-1530/1531, 1-2 National Instruments Web support, C-1 to C-2 LabVIEW NI-DAQ software, B-2 SCXI channel string, 2-8 to 2-9 virtual channel string, 2-9 to 2-10...
  • Page 59 See multiplexed scanning. parallel mode operation, 2-11 to 2-13 rear signal connector (figure), 2-7 safety information, 1-14 to 1-15 removing SCXI-1530/1531, 1-12 to 1-14 signal conditioning, 2-2 to 2-3 from Measurement & Automation signal connections, 2-3 to 2-6...
  • Page 60 2-9 to 2-10 transducers VirtualBench software, 1-1, B-4 floating (non-referenced) transducer, 2-5 ground-referenced transducer, 2-5 using SCXI-1530/1531 with Web support from National Instruments, transducers, B-1 C-1 to C-2 troubleshooting online problem-solving and diagnostic incorrect test and verification, B-2...

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