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National Instruments SCXI-1112 User Manual

National Instruments SCXI-1112 User Manual

8-channel direct-connect thermocouple amplifier module
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SCXI
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SCXI-1112 User Manual
8-Channel Direct-Connect Thermocouple Amplifier Module
SCXI-1112 User Manual
August 1999 Edition
Part Number 322476A-01

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Summary of Contents for National Instruments SCXI-1112

  • Page 1 SCXI ™ SCXI-1112 User Manual 8-Channel Direct-Connect Thermocouple Amplifier Module SCXI-1112 User Manual August 1999 Edition Part Number 322476A-01...
  • Page 2 Switzerland 056 200 51 51, Taiwan 02 2377 1200, United Kingdom 01635 523545 For further support information, see the Technical Support Resources appendix. To comment on the documentation, send e-mail to techpubs@natinst.com. © Copyright 1999 National Instruments Corporation. All rights reserved.
  • Page 3 Important Information Warranty The SCXI-1112 is 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: Table Of Contents

    Manually Adding Modules................2-4 Configuring the SCXI-1112 ................2-5 Self-Test Verification ..................2-6 Troubleshooting Self-Test Verification............2-6 Removing the SCXI-1112 .....................2-7 Removing the SCXI-1112 from an SCXI Chassis ..........2-7 Removing Modules from Software ..............2-8 Chapter 3 Signal Connections Front Connector ......................3-1 Analog Input Signal Connections..............3-2 Cold-Junction Sensors ..................3-3...
  • Page 5 Figure 2-2. Removing the SCXI-1112..............2-8 Figure 3-1. SCXI-1112 Module Front Connector Pin Assignments ....... 3-2 Figure 3-2. SCXI-1112 Module Rear Signal Connector Pin Assignments ..... 3-4 Figure 4-1. SCXI-1112 Module Block Diagram ............. 4-1 Table Table 3-1. SCXIbus to SCXI-1112 Module Rear Signal Connector to DAQ Device Pin Equivalencies............

  • Page 6: About This Manual

    This manual describes the electrical and mechanical aspects of the SCXI-1112 module and contains information concerning its installation and operation. The SCXI-1112 module is a member of the National Instruments Signal Conditioning eXtensions for Instrumentation (SCXI) Series for the National Instruments data acquisition (DAQ) plug-in devices. This module is designed for conditioning thermocouple signals.

  • Page 7: National Instruments Documentation

    Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the Glossary. National Instruments Documentation SCXI-1112 User Manual is one piece of the documentation set for your data acquisition system. You could have any of several manuals, depending on the hardware and software in your system. Use the manuals you have as follows: •...

  • Page 8: Introduction

    Introduction This chapter describes the SCXI-1112 module, lists what you need to get started with your SCXI-1112 module, and provides an overview of your software options. About the SCXI-1112 Module This module amplifies and filters thermocouple signals. The SCXI-1112 has eight differential analog input channels and eight cold-junction sensor channels.

  • Page 9: Software Programming Choices

    Software Programming Choices You have several options to choose from when programming your National Instruments DAQ and SCXI hardware. You can use National Instruments application software, or a third-party programming environment. In either case, you must use NI-DAQ driver software.

  • Page 10: Ni-Daq Driver Software

    DMA controllers. NI-DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to your code. Figure 1-1 illustrates the relationship between NI-DAQ and your National Instruments application software. ComponentWorks, Third-Party LabVIEW,...

  • Page 11: Scxi-1112 Module Installation

    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-1112 module into a chassis that is turned on. Insert the SCXI-1112 module into the module guides. Gently push the module into the slot until the front of the module is flush with the front of the chassis.

  • Page 12: Figure 2-1. Installing The Scxi-1112

    SCXI-1112 Module Installation Rotate the thumbscrews clockwise to fasten the front of the SCXI-1112 module to the top and bottom threaded strips of your SCXI chassis. If this module is to be connected to an MIO DAQ device, insert the metal cable adapter of the SCXI-1349 cable assembly to the rear signal connector on the SCXI-1112 module.

  • Page 13: Configuration And Self-Test

    Configuration and Self-Test Run Measurement & Automation Explorer to configure and test your SCXI-1112. If you need help during the configuration process, open the Measurement & Automation help file by selecting Help Topics from the Help menu. Follow these steps to configure your SCXI system: Double-click the Measurement &...

  • Page 14: Auto-Detecting Modules

    Chapter 2 SCXI-1112 Module Installation Auto-Detecting Modules If you selected auto-detect, you must have your chassis connected to your DAQ device, except in the case of a remote chassis, which you should connect to the computer using a serial port cable.

  • Page 15: Configuring The Scxi-1112

    This device will control the chassis. If you need to manually install more SCXI-1112 modules in your chassis, repeat steps 3 through 5 to configure each module.

  • Page 16: Self-Test Verification

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

  • Page 17: Removing The Scxi-1112

    Installation. If the module is installed in the correct slot, turn off the chassis, remove the module as specified in Removing the SCXI-1112 from an SCXI Chassis, and verify that no connector pins are bent on the rear signal connector.

  • Page 18: Removing Modules From Software

    1 Cable 3 SCXI-1112 Module 4 Chassis 2 Thumbscrews Figure 2-2. Removing the SCXI-1112 Removing Modules from Software To remove a module from software, follow these steps after entering the Measurement & Automation Explorer utility. Click the + next to the Devices and Interfaces icon.
  • Page 19 Chapter 2 SCXI-1112 Module Installation Note Deleting the SCXI chassis deletes all modules in the chassis. All configuration information for these modules is also lost. Your SCXI chassis and/or module(s) are now removed from the Measurement & Automation Explorer software.

  • Page 20: Signal Connections

    Signal Connections This chapter describes the input and output signal connections to the SCXI-1112 module via the module front and rear signal connectors. This chapter also includes connection instructions for the signals on the SCXI-1112 module connectors. Caution Static electricity is a major cause of component failure. To prevent damage to the electrical components in the module, take antistatic precautions whenever removing a module from the chassis or whenever handling a module.

  • Page 21: Analog Input Signal Connections

    Figure 3-1. SCXI-1112 Module Front Connector Pin Assignments Analog Input Signal Connections The differential input signal range of an SCXI-1112 module input channel is ±0.1 V. This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs. The common-mode input signal range of an SCXI-1112 module input channel is ±11 V.

  • Page 22: Cold-Junction Sensors

    Exceeding the input damage level (±42 VAC peak or VDC between input channels and chassis ground) can damage the SCXI-1112 module, the SCXIbus, and the DAQ device. Furthermore, applying a voltage greater than ±42 VAC peak or VDC to the SCXI-1112 is an electrical shock hazard.

  • Page 23: Rear Signal Connector

    Rear Signal Connector Note If you are using the SCXI-1112 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-1112 module, read this section.

  • Page 24: Rear Signal Connector Pin Descriptions

    SCXI module that the DAQ device has taken a sample and causes the module to advance channels. Serial Clock—This signal clocks the data on the SERCLK Input SERDATIN and SERDATOUT lines. 43, 46 Reserved RSVD Input All other pins are not connected. © National Instruments Corporation SCXI-1112 User Manual...

  • Page 25: Digital I/O Signal Connections

    The SCXI-1112 module digital input and output signals correspond to the digital I/O lines of E Series MIO DAQ devices. Table 3-1 lists the equivalencies. Table 3-1. SCXIbus to SCXI-1112 Module Rear Signal Connector to DAQ Device Pin Equivalencies SCXI-1112 Rear...

  • Page 26: Theory Of Operation

    Theory of Operation This chapter contains a functional overview of the SCXI-1112 module and explains the operation of each functional unit making up the SCXI-1112 module. Functional Overview The block diagram in Figure 4-1 illustrates the key functional components of the SCXI-1112 module.

  • Page 27: Rear Signal Connector, Scxibus Connector, And Scxibus Interface

    Module ID, Configuration, EEPROM, and Channel. The Address Handler controls which register is being addressed. The Module ID Register contains a code unique to the SCXI-1112 module. The Module ID is 33 decimal. The Configuration Register configures the SCXI-1112 modules for the desired scanning mode and connection to the rear signal connector.

  • Page 28: Analog Input Channels

    The 3 µs interchannel delay gives you a maximum sampling rate of 333 kHz. Because this rate is higher than the bandwidth of a single SCXI-1112 channel (2 Hz), you can sample multiple channels on multiple SCXI modules without undersampling one of the SCXI-1112 channels.
  • Page 29 Specifications This appendix lists the specifications for the SCXI-1112 modules. These specifications are typical at 25 °C unless otherwise noted. Analog Input Input Characteristics Number of channels ....... 8 differential Input signal ranges ......... ±100 mV Max working voltage (signal + common mode) ....... Each input should remain within ±10 V of CGND...

  • Page 30: Appendix A Specifications

    ±0.7 ±0.7 ±0.7 ±0.9 — — ±0.9 ±0.7 ±0.7 ±0.7 ±1.0 ±1.2 — ±1.1 ±0.8 ±0.7 ±0.7 ±1.0 — — ±0.9 ±0.7 ±0.7 ±0.7 — — — ±1.0 ±0.7 ±0.8 ±0.8 — — — (400 °C) SCXI-1112 User Manual www.natinst.com...
  • Page 31 Offset temperature coefficient ....1 µV/°C Gain temperature coefficient....10 ppm/°C Physical Dimensions..........115 by 273 mm (4.54 by 10.75 in.) I/O connector.......... 50-pin male ribbon cable rear connector 96-pin male DIN C front connector © National Instruments Corporation SCXI-1112 User Manual...
  • Page 32 Operating temperature ......0 to 50 °C Storage temperature ........–55 to 150 °C Relative humidity ........5 to 90% noncondensing Power Requirements 5 V supply..........15 mA max ±15 V supply (regulated from ±24 V supply) ........150 mA max SCXI-1112 User Manual www.natinst.com...

  • Page 33: 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 34 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 35: Glossary

    –3 milli- kilo- mega- tera- Numbers/Symbols +5 V +5 volt signal ° degrees Ω ohms percent ± plus or minus amperes alternating current analog input channel signal analog-to-digital AIGND analog input ground signal © National Instruments Corporation SCXI-1112 User Manual...
  • Page 36 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 decibel—the unit for expressing a logarithmic measure of the ratio of two signal levels: dB=20log10 V1/V2, for signals in volts direct current SCXI-1112 User Manual www.natinst.com...
  • Page 37 FIFO ahead of time. This again reduces the effect of latencies associated with getting the data from system memory to the DAQ device. full-scale reading © National Instruments Corporation SCXI-1112 User Manual...
  • Page 38 MISO master in, slave out MOSI master out, slave in most significant bit SCXI-1112 User Manual www.natinst.com...
  • Page 39 SERDATIN serial data input signal SERDATOUT serial data output signal signal conditioning the manipulation of signals to prepare them for digitizing SLOT0SEL* Slot 0 select signal SPICLK serial peripheral interface clock © National Instruments Corporation SCXI-1112 User Manual...
  • Page 40 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 volts, input high volts, input low volts in volts, output high volts, output low SCXI-1112 User Manual www.natinst.com...

  • Page 41: Index

    National Instruments documentation, viii transfer characteristics, A-1 auto-detecting modules, 2-4 auto-zero calibration switches, 3-3 environment specifications, A-4 block diagram of SCXI-1112, 4-1 filter specifications, A-3 front connector, 3-1 to 3-3 analog input signal connections, 3-2 to 3-3 calibration, auto-zero, 3-3...
  • Page 42 Measurement & Automation Explorer modules from Measurement & Automation Explorer, 2-8 to 2-9 auto-detecting modules, 2-4 SCXI-1112 from SCXI chassis, 2-7 to 2-8 configuration procedure, 2-5 requirements for getting started, 1-1 to 1-2 manually adding modules, 2-4 to 2-5 overview of configuration procedure, 2-3...
  • Page 43 A-1 to A-2 VirtualBench software, 1-2 dynamic characteristics, A-2 input characteristics, A-1 transfer characteristics, A-1 digital signals, A-3 Web support from National Instruments, B-1 to B-2 environment, A-4 online problem-solving and diagnostic filters, A-3 resources, B-1 physical, A-3...

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