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National Instruments SCXI-1104 User Manual

National Instruments SCXI-1104 User Manual

32-channel medium-voltage input module
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SCXI
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SCXI-1104/C User Manual
32-Channel Medium-Voltage Input Module
SCXI-1104/C User Manual
February 2000 Edition
Part Number 322147B-01

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  • Page 1 SCXI ™ SCXI-1104/C User Manual 32-Channel Medium-Voltage Input Module SCXI-1104/C User Manual February 2000 Edition Part Number 322147B-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 1998, 2000 National Instruments Corporation. All rights reserved.
  • Page 3 Any action against National Instruments must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control.

  • Page 4: Table Of Contents

    Installation and Configuration Installing the Software ....................2-1 Installing the SCXI-1104/C ...................2-2 Installing the SCXI-1104/C Module into the SCXI Chassis ......2-2 Connecting the SCXI-1104/C to a DAQ Device for Multiplexed Scanning in an SCXI Chassis ...............2-3 Connecting the SCXI-1104/C to a DAQ Device for Multiplexed Scanning in a PXI Combination Chassis............2-5...
  • Page 5 Analog Circuitry and Front Signal Connector ..........5-3 Analog Input Channels ..............5-3 Analog Bus Switches................ 5-3 Chapter 6 Calibration Overview ........................6-1 Calibration Procedure....................6-1 Calibration Equipment Requirements ............. 6-1 Gain and Offset Calibration ................6-2 SCXI-1104/C User Manual www.ni.com...
  • Page 6 SCXI-1104/C Module Rear Signal Connector Pin Assignments..3-4 Figure 5-1. SCXI-1104/C Module Block Diagram..........5-1 Tables Table 3-1. SCXIbus to SCXI-1104/C Module Rear Signal Connector to DAQ Device Pin Equivalencies ............3-6 Table B-1. Digital Signals on the SCXI-1104/C .............B-3 © National Instruments Corporation...

  • Page 7: About This Manual

    About This Manual This manual describes the installation, operation, and use of the SCXI-1104 family of modules. The SCXI-1104 family consists of the following modules: • SCXI-1104 • SCXI-1104C The SCXI-1104/C modules are members of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series that are designed for use with National Instruments data acquisition (DAQ) devices.

  • Page 8: Related Documentation

    This font also emphasizes lines of code that are different from the other examples. SCXI-1104/C Refers to both the SCXI-1104 and SCXI-1104C modules. Related Documentation SCXI-1104/C User Manual is one piece of the documentation set for your data acquisition system.
  • Page 9 Accessory installation guides or manuals—Consult these guides when you are installing terminal blocks, cable assemblies, or other SCXI accessories. • SCXI chassis manual—Read this manual to obtain chassis installation instructions and maintenance information. © National Instruments Corporation SCXI-1104/C User Manual...

  • Page 10: Introduction

    The SCXI-1104/C modules are for signal conditioning medium-voltage signals. The SCXI-1104/C has 32 differential analog input channels. Each channel also has a divide-by-10 attenuator stage before the amplifier. You can multiplex the SCXI-1104/C inputs to a single module output that drives a DAQ device input channel. ♦...

  • Page 11: What You Need To Get Started

    Chapter 1 Introduction What You Need to Get Started To install, configure, and use your SCXI-1104/C, you will need the following items: One of the following modules – SCXI-1104 – SCXI-1104C SCXI-1104/C User Manual One of the following connectivity devices –...

  • Page 12: Unpacking

    Chapter 1 Introduction Unpacking Your SCXI-1104/C module is shipped in an antistatic package to prevent electrostatic damage to the module. Electrostatic discharge can damage several components in the module. To avoid damaging the module, take the following precautions: • Ground yourself using a grounding strap or by holding a grounded object.

  • Page 13: Installation And Configuration

    Installation and Configuration This chapter describes how to install and configure the SCXI-1104/C module. The SCXI-1104/C is a jumperless module and requires no user modifications. There is no need for the user to remove the module cover. Note The SCXI-1104/C does not support ribbon-cabled multichassis SCXI systems. You must use the SCXI-1346 multichassis adapter in a multichassis system.

  • Page 14: Installing The Scxi-1104/C

    Turn off the computer that contains the DAQ device or disconnect it from your SCXI chassis. Turn off the SCXI chassis. Do not insert the SCXI-1104/C module into a chassis that is turned on. Insert the SCXI-1104/C 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 15: Connecting The Scxi-1104/C To A Daq Device For Multiplexed Scanning In An Scxi Chassis

    Connecting the SCXI-1104/C to a DAQ Device for Multiplexed Scanning in an SCXI Chassis This configuration allows you to multiplex all 32 input channels of the SCXI-1104/C into a single channel of your DAQ device. You need the following items for this installation: •...
  • Page 16 Turn on the SCXI chassis. Turn on the computer. If you have already installed the appropriate software, you are ready to configure the SCXI-1104/C module(s) for multiplexed mode operation. See Configuration and Self-Test in this chapter.

  • Page 17: Connecting The Scxi-1104/C To A Daq Device For Multiplexed Scanning In A Pxi Combination Chassis

    Connecting the SCXI-1104/C to a DAQ Device for Multiplexed Scanning in a PXI Combination Chassis This configuration allows you to multiplex all 32 channels of your SCXI-1104/C into a single channel of your DAQ device in a combination PXI chassis. You need the following items for this installation: •...

  • Page 18: Configuration And Self-Test

    To use the SCXI-1104/C module in multiplexed mode with a DAQ device in a PXI combination chassis, follow these steps: No cables are required between the SCXI-1104/C and DAQ device if the National Instruments PXI DAQ device is installed in the right-most slot.

  • Page 19: Auto-Detecting Modules

    If the software recognized any module as an SCXI custom module, you may be using the wrong version of NI-DAQ. See Appendix B, Common Questions, for information on getting the latest version of NI-DAQ. © National Instruments Corporation SCXI-1104/C User Manual...

  • Page 20: Manually Adding Modules

    Select the accessory you are using with this module. When you have completed configuration, click Finish. If you need to manually install more SCXI-1104/C modules in your chassis, repeat steps 3 through 5 to configure each module. Your SCXI chassis and SCXI module(s) should now be configured properly.

  • Page 21: Configuring The Scxi-1104/C

    Chapter 2 Installation and Configuration Configuring the SCXI-1104/C To configure your SCXI-1104/C after auto-detection, or to alter your original configuration selections, you must use the configuration utility in Measurement & Automation Explorer. Perform the following steps to configure your SCXI-1104/C: Run Measurement &...

  • Page 22: Self-Test Verification

    Make sure the cable between the SCXI chassis and DAQ device is properly connected. Inspect the cable connectors for 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 23: Removing The Scxi-1104/C

    Common Questions, for more information. Removing the SCXI-1104/C This section will show you how to remove the SCXI-1104/C from an SCXI chassis. Removing the SCXI-1104/C from an SCXI Chassis Only a qualified person who has read and understands all the safety information in this manual should remove an SCXI module, disconnect signals, or remove the SCXI-1104/C from the chassis.
  • Page 24 To remove the SCXI-1104/C module from an SCXI chassis follow the steps that follow while referring to Figure 2-3: If the SCXI-1104/C is the cabled module, disconnect the cable running from the SCXI-1104/C to the DAQ device. Caution...

  • Page 25: Removing The Scxi-1104/C From Measurement & Automation Explorer

    4 Terminal Block 6 SCXI Chassis Figure 2-3. Removing the SCXI-1104/C Removing the SCXI-1104/C from Measurement & Automation Explorer To remove a module from Measurement & Automation Explorer, take the following steps after entering the Measurement & Automation Explorer utility: Display the list of installed devices and interfaces by clicking the + next to the Devices and Interfaces icon.
  • Page 26 Deleting the SCXI chassis deletes all modules in the chassis. All configuration information for these modules is also lost. Your SCXI chassis and/or SCXI module(s) should now be removed from the list of installed devices in Measurement & Automation Explorer. SCXI-1104/C User Manual 2-14 www.ni.com...

  • Page 27: Signal Connections

    Signal Connections This chapter describes the input and output signal connections to the SCXI-1104/C module using the front and rear signal connectors. This chapter also includes specifications and connection instructions for the signals on SCXI-1104/C connectors. Caution Static electricity is a major cause of component failure. To prevent damage to the electrical components in the module, use antistatic techniques whenever removing a module from the chassis or whenever touching a module.

  • Page 28: Front Signal Connector

    Chapter 3 Signal Connections Front Signal Connector Figure 3-1 shows the pin assignments for the SCXI-1104/C module front signal connector. CGND CH0– CH0+ CH1– CH1+ CH2– CH2+ CH3– CH3+ CH4– CH4+ CH5– CH5+ CH6– CH6+ CH7– CH7+ CGND CH8– CH8+ CH9–...

  • Page 29: Front Signal Connector Signal Descriptions

    Exceeding the input damage level (±42 VAC or 60 VDC between input peak channels and chassis ground) can damage the SCXI-1104/C module, the SCXIbus, and the DAQ device. National Instruments is not liable for any damage or injuries resulting from such signal connections.

  • Page 30: Rear Signal Connector

    Rear Signal Connector Note If you are using the SCXI-1104/C module with a National Instruments DAQ device and cable assembly, you do not need to read the remainder of this chapter. If you are using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1104/C module, read this section.

  • Page 31: Rear Signal Connector Descriptions

    SERCLK Input Serial Clock—This signal clocks the data on the SERDATIN and SERDATOUT lines. 43, 46 RSVD Input Reserved All other pins are not connected. * means that the signal is asserted low. © National Instruments Corporation SCXI-1104/C User Manual...

  • Page 32: Analog Output Signal Connections

    SCXI-1104/C module, if necessary. Caution The SCXI-1104/C module analog output is not overvoltage-protected. Applying external voltages to this output can damage the SCXI-1104/C module. National Instruments is not liable for any damage resulting from such signal connections. Note The SCXI-1104/C module analog outputs are short-circuit protected.

  • Page 33: Programming

    Configuration. Using this mode of operation, you can sequentially route all input channels of the SCXI-1104/C to one output channel that is connected to a single input channel on a DAQ device. Digital timing signals automatically synchronize the module multiplexer with the DAQ device analog-to-digital converter (ADC), permitting the NI-DAQ driver software to match up voltage readings with the channel of origin.

  • Page 34: Channel Addressing

    0 in a single-chassis system. In a multichassis or remote chassis system, however, the DAQ device channel x corresponds to chassis number n-1, where DAQ device channel x is used for scanning the nth chassis in the system. SCXI-1104/C User Manual www.ni.com...

  • Page 35: Labview And The Virtual Channel String

    If the scaling changes or you want to connect a different sensor to your SCXI-1104/C, no changes are needed in the application. All you need to do is create a different virtual channel and use its name in the channel string.

  • Page 36: Multiplexed Scanning

    You have completed a multiplexed scan using your SCXI-1104/C. 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 37 DAQ device, you can use to perform the SCAN_OP scanning operation. After scanning, convert the binary data to voltage data using . Refer to the NI-DAQ User Manual for additional SCXI_Scale information on scanning with DAQ devices. © National Instruments Corporation SCXI-1104/C User Manual...

  • Page 38: Theory Of Operation

    Theory of Operation This chapter contains a functional overview of the SCXI-1104/C module and explains the operation of each functional unit making up the SCXI-1104/C module. Functional Overview The block diagram in Figure 5-1 illustrates the key functional components of the SCXI-1104/C module.

  • Page 39: Functional Unit Description

    • EEPROM • Channel The Address Handler controls which register is being addressed. The Module ID Register contains a code unique to each type of SCXI-1104 module: • SCXI-1104—The Module ID is 45 decimal. • SCXI-1104C—The Module ID is 47 decimal.

  • Page 40: Analog Circuitry And Front Signal Connector

    Analog Bus Switches The SCXI-1104/C module contains switches to route the multiplexer output to the SCXIbus. The SCXI-1104/C module also contains a switch to receive a signal placed on the SCXIbus by another SCXI module. The output buffer of the cabled module drives a received signal onto the MCH0+ line of its rear signal connector so that the DAQ device can read it.

  • Page 41: Calibration

    Calibration Procedure This section describes the calibration equipment requirements and explains how to calibrate the offset and gain on the SCXI-1104/C module. Calibration Equipment Requirements According to standard practice, the equipment you use to calibrate the SCXI-1104/C module should be ten times as accurate as the SCXI-1104/C module.

  • Page 42: Gain And Offset Calibration

    NI-DAQ function or equivalent VI as described in SCXI_Cal_Constants your software documentation. To determine the offset and gain calibration factors of the SCXI-1104/C module for a given channel, perform the following steps for a two-point calibration: Select the desired channel.
  • Page 43 This is also true for the positive full-scale voltage if you use the negative full-scale voltage and 0 V as your two calibration points. When you make a measurement using National Instruments software, the driver automatically uses the calibration constants to correct the measured voltages.
  • Page 44 Specifications This appendix lists the specifications for the SCXI-1104/C module. These specifications are typical at 25 °C unless otherwise noted. Analog Input Input Characteristics Number of channels ....... 32 differential Input signal ranges ......... 30 VAC ±42 VAC peak ±60 VDC Max working voltage (signal + common mode) .......
  • Page 45 V max input current leakage ....±1 µA max Digital output specifications (referenced to DGND) output logic high voltage ..3.7 V min at 4 mA max output logic low voltage ..0.4 V max at 4 mA max SCXI-1104/C User Manual www.ni.com...
  • Page 46 Appendix A Specifications Filters Cutoff frequency (–3 dB) SCXI-1104 ........2 Hz SCXI-1104C ........10 kHz NMR (60 Hz) ......... 40 dB (SCXI-1104) Step response (either gain) Accuracy SCXI-1104 SCXI-1104C 200 µs To 0.1% To 0.01% 10 s 1 ms Stability Recommended warm-up time ....
  • Page 47 Appendix A Specifications Power Requirements 5 V supply..........15 mA max ±15 V supply (regulated from ±24 V supply) ........150 mA max SCXI-1104/C User Manual www.ni.com...
  • Page 48 SCXI-1104/C. What is the difference between the SCXI-1104 and SCXI-1104C? The SCXI-1104 has a fixed cutoff frequency of 2 Hz. The SCXI-1104C has a fixed cutoff frequency of 10 kHz. They are identical in all other respects. The SCXI-1104 is commonly used to measure slowly-varying medium- voltage signals in a high-noise environment.
  • Page 49 Which version of the NI-DAQ driver software is needed to use the SCXI-1104/C? NI-DAQ version 6.5.1 or later is required for the SCXI-1104. NI-DAQ version 6.7 or later is required for the SCXI-1104C. How do I obtain the most current version of NI-DAQ? Visit our Web site and follow the link, Download Software»Drivers and...

  • Page 50: Table B-1. Digital Signals On The Scxi-1104/C

    Which digital lines are unavailable on the DAQ device if it is directly connected to an SCXI-1104/C module? Table B-1 shows the digital lines that are used by the SCXI-1104/C for communication and scanning. These lines are unavailable for general- purpose digital I/O if the SCXI-1104/C is connected to the DAQ device.
  • Page 51 Appendix B Common Questions Which accessories can I use to connect signals to the front signal connector of the SCXI-1104/C? You can use the SCXI-1300 front-mounted terminal block, BNC-2095 rack-mounted BNC connector accessory, TBX-96 DIN-rail terminal block, or the SCXI-1310 connector-and-shell kit.
  • Page 52 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 53 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 54 Ω ohms percent ± plus or minus amperes alternating current analog input channel signal analog-to-digital analog-to-digital converter—an electronic device, often an integrated circuit, that converts an analog voltage to a digital number © National Instruments Corporation SCXI-1104/C User Manual...
  • Page 55 SCXI modules clock input signal CMOS complementary metallic oxide semiconductor CMRR common-mode rejection ratio cutoff frequency the frequency that defines the upper end of the passband of a lowpass filter SCXI-1104/C User Manual www.ni.com...
  • Page 56 DAQ device EEPROM electrically erasable programmable read-only memory—ROM that can be erased with an electrical signal and reprogrammed © National Instruments Corporation SCXI-1104/C User Manual...
  • Page 57 SCXIbus from the scanned SCXI module to the cabled SCXI module input damage level the highest voltage level that you can apply to the module without damaging it SCXI-1104/C User Manual www.ni.com...
  • Page 58 (signal) NI-DAQ the driver software needed in order to use National Instruments DAQ devices and SCXI components normal-mode rejection nonlinearity a measure, in percent of full-scale range, of the worst-case deviation from the ideal transfer function of an amplifier, which is a straight line NRSE nonreferenced single-ended mode—all measurements are made with...
  • Page 59 RSVD reserved pin RTSI bus real-time system integration bus—the National Instruments timing bus that connects DAQ devices directly, by means of connectors on top of the devices, for precise synchronization of functions samples...
  • Page 60 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 © National Instruments Corporation SCXI-1104/C User Manual...
  • Page 61 SCXI-1104/C User Manual www.ni.com...
  • Page 62 2-10 to 2-11, B-2 signal connections, 3-3 to 3-4 Configuration Register, 5-3 analog input channels, 5-3 connecting SCXI-1104/C to DAQ device auto-detection of modules, 2-7 in PXI combination chassis, 2-5 to 2-6 in SCXI chassis, 2-3 to 2-5 connectors. See front signal connector; rear signal connector.
  • Page 63 Index SCXIbus to SCXI-1104/C module rear software installation, 2-1 signal connector to DAQ device pin unpacking SCXI-1104/C, 1-3 equivalencies (table), 3-6 specifications, A-2 unavailable signals with DAQ device connected (table), B-3 LabVIEW documentation SCXI channel string, 4-2 to 4-3 conventions used in manual, ix-x...
  • Page 64 Index SCXIbus to SCXI-1104/C module rear signal connector to DAQ device pin National Instruments Web support, C-1 to C-2 equivalencies (table), 3-6 NI-DAQ version required, B-2 signal descriptions (table), 3-5 registers in digital control circuitry, 5-2 to 5-3 removing SCXI-1104/C, 2-11 to 2-14 from Measurement &...
  • Page 65 Index SCXIbus to SCXI-1104/C module rear signal input characteristics, A-1 connector to DAQ device pin equivalencies physical, A-3 (table), 3-6 power requirements, A-4 self-test verification, 2-10 stability, A-3 troubleshooting, 2-10 to 2-11, B-2 transfer characteristics, A-1 SERCLK signal (table), 3-5, 3-6...

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