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DAQ VXI-SC-1000 User Manual

32-channel multiplexer amplifier module
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Summary of Contents for DAQ VXI-SC-1000

  • Page 1 VXI-SC-1000...
  • Page 2 VXI-SC-1102 User Manual 32-Channel Multiplexer Amplifier Module February 1997 Edition Part Number 321385A-01 © Copyright 1997 National Instruments Corporation. All Rights Reserved.
  • Page 3 Internet Support support@natinst.com E-mail: info@natinst.com FTP Site: ftp.natinst.com Web Address: http://www.natinst.com Bulletin Board Support BBS United States: (512) 794-5422 BBS United Kingdom: 01635 551422 BBS France: 01 48 65 15 59 Fax-on-Demand Support (512) 418-1111 Telephone Support (U.S.) Tel: (512) 795-8248 Fax: (512) 794-5678 International Offices Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20,...
  • Page 4 Trademarks ® ® ® LabVIEW , NI-DAQ , RTSI , ComponentWorks™, CVI™, Measure™, SCXI™, and VirtualBench™ are trademarks of National Instruments Corporation. Product and company names listed are trademarks or trade names of their respective companies. WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS National Instruments products are not designed with components and testing intended to ensure a level of reliability suitable for use in treatment and diagnosis of humans.

  • Page 5: Table Of Contents

    About the VXI-SC-1102 ....................1-2 What You Need to Get Started ..................1-3 Software Programming Choices ................... 1-3 National Instruments Application Software ........... 1-3 NI-DAQ Driver Software ................1-4 VXIplug&play Instrument Driver ..............1-5 Optional Equipment ...................... 1-6 Unpacking ........................1-6...
  • Page 6 Figures Figure 1-1. VXI Signal Conditioning System............1-1 Figure 1-2. The Relationship between the Programming Environment, Your Instrument Driver, and Your VXI-DAQ Hardware ......1-5 Figure 2-1. VXI-SC-1102 Parts Locator Diagram ........... 2-2 Figure 2-2. Bent and Trimmed Resistor..............2-3 Figure 3-1.
  • Page 7 Table of Contents Figure 4-1. VXI-SC-1102 Block Diagram ............... 4-1 Figure 5-1. Analog Bus Receptacle Pin Assignment ..........5-2 Tables Table 3-1. Front Connector Signal Descriptions............. 3-3 © National Instruments Corporation VXI-SC-1102 User Manual...

  • Page 8: About This Manual

    VXI-SC-1102. • Chapter 2, Installation, describes how to install current-loop receivers on your VXI-SC-1102 and gives information about installing your VXI-SC-1102 submodule into the VXI-SC-1000 carrier module. • Chapter 3, Signal Connections, describes the input signal connections to the VXI-SC-1102 submodule via the front connector.

  • Page 9: Conventions Used In This Manual

    Refers to any of the National Instruments VXI-MIO Series of plug-in data acquisition boards. carrier module Refers to the VXI-SC-1000, which plugs directly into a VXI slot and on which VXI-SC submodules are installed. VXI-SC submodule Refers to VXI signal conditioning hardware that installs onto the carrier module.

  • Page 10: National Instruments Documentation

    National Instruments Documentation The VXI-SC-1102 User Manual is one piece of the documentation set for your VXI-DAQ system. You could have any of several types of documents, depending on the hardware and software in your system. Use the different types of documents you have as follows: •...

  • Page 11: Introduction

    Chapter Introduction This chapter describes the VXI-SC-1102, lists what you need to get started, optional software and optional equipment, and explains how to unpack the VXI-SC-1102. The VXI-SC-1102 is part of the VXI signal conditioning system, which consists of a carrier module and one or more VXI signal conditioning submodules or filler panels as shown in Figure 1-1.

  • Page 12: About The Vxi-Sc-1102

    Chapter 1 Introduction The VXI-SC-1000 is a carrier module that installs into a slot in a VXIbus chassis and is populated with one or two submodules. The VXI-SC-1102 is a submodule that installs into VXI-SC subslots on a VXI-SC-1000 carrier module.

  • Page 13: What You Need To Get Started

    The LabVIEW Data Acquisition VI Library, a series of VIs for using LabVIEW with National Instruments DAQ hardware, is included with LabVIEW. The LabVIEW Data Acquisition VI Library is functionally equivalent to the NI-DAQ software.

  • Page 14: Ni-Daq Driver Software

    NI-DAQ Driver Software The NI-DAQ driver software is included at no charge with all National Instruments DAQ hardware. NI-DAQ is not packaged with accessory products. NI-DAQ has an extensive library of functions that you can call from your application programming environment.

  • Page 15: Vxiplug&Play Instrument Driver

    Chapter 1 Introduction DAQ devices because it lets multiple devices operate at their peak performance. NI-DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to your code. VXI plug&play Instrument Driver National Instruments distributes VXIplug&play instrument drivers free...

  • Page 16: Optional Equipment

    Chapter 1 Introduction Optional Equipment National Instruments offers a variety of products to use with your VXI-SC-1102 module, as follows: • Terminal blocks and 96-pin cables that allow you to attach input signals to your submodule • SCXI Process Current Resistor Kit For more specific information about these products, refer to your National Instruments catalogue or call the office nearest you.

  • Page 17: Installation

    This chapter describes how to install current-loop receivers on your VXI-SC-1102 and gives information about installing your VXI-SC-1102 submodule into the VXI-SC-1000 carrier module. Refer to Figure 2-1, VXI-SC-1102 Parts Locator Diagram, for information as you read the instructions in this chapter.
  • Page 18 Chapter 2 Installation 1 Serial Number 2 Product Name 3 Assembly Number 4 RCL x Pads VXI-SC-1102 User Manual 2-20 © National Instruments Corporation...

  • Page 19: Current-Loop Receivers

    Warning: Before installing the resistors in your submodule, make sure that there are no signals connected to your submodule front connector. Install the resistors by performing the following steps: 1. Follow the instructions in the VXI-SC-1000 Carrier Module Installation Guide to remove the VXI-SC-1102 submodule from the carrier assembly.

  • Page 20: Installing Your Hardware

    Chapter 2 Installation Installing Your Hardware Follow the instructions in the VXI-SC-1000 Carrier Module Installation Guide to replace the VXI-SC-1102 submodule and to install the assembled VXI-SC carrier module in the VXIbus chassis. VXI-SC-1102 User Manual 2-22 © National Instruments Corporation...

  • Page 21: Signal Connections

    Chapter Signal Connections This chapter describes the analog input signal connections to the VXI-SC-1102 submodule via the front connector. Caution: Static electricity is a major cause of component failure. To prevent damage to the electrical components in the module, observe antistatic techniques whenever removing a module from the chassis or whenever working on a module.

  • Page 22: Figure 3-1. Vxi-Sc-1102 Front Connector Pin Assignments

    Chapter 3 Signal Connections CGND CH0- CH0+ CH1- CH1+ CH2- CH2+ CH3- CH3+ CH4- CH4+ CH5- CH5+ CH6- CH6+ CH7- CH7+ CGND CH8- CH8+ CH9- CH9+ CH10- CH10+ CH11- CH11+ CH12- CH12+ CH13- CH13+ CH14- CH14+ CH15- CH15+ CGND CH16- CH16+ CH17- CH17+...

  • Page 23: Signal Descriptions

    Chapter 3 Signal Connections Signal Descriptions Table 3-1. Front Connector Signal Descriptions Signal Name Description +5 V +5 VDC Source—Powers the temperature sensor on the terminal block. 0.2 mA of source not protected. A2, A5, A16, CGND Chassis Ground—Tied to the A24, A32 VXIbus chassis.

  • Page 24: Ground-Referencing Your Signals

    Chapter 3 Signal Connections is ±11 V. This common-mode input range for either positive or negative channel input is the maximum input voltage (relative to CGND) that will result in a valid measurement. Each channel includes input protection circuitry to withstand the accidental application of voltages up to ±42 VAC peak or VDC.

  • Page 25: Figure 3-2. Ground-Referenced Signal Connection

    Chapter 3 Signal Connections CH0 + CH0 - diff CH1 + CH1 - VXI-SC-1102 Figure 3-2. Ground-Referenced Signal Connection © National Instruments Corporation 3-27 VXI-SC-1102 User Manual...

  • Page 26: Cold-Junction Sensor Connection

    Chapter 3 Signal Connections CH0 + CH0 - Floating Signal CH1 + CH1 - Make this connection to ground reference the signal. CGND Reference to VXI-SC-1102 Chassis Ground Figure 3-3. Floating Signal Connection Referenced to Chassis Ground Cold-Junction Sensor Connection Pins A3 and A4 (CJSENSOR) connect the temperature sensor located on the National Instruments VXI-TB Series terminal block to the VXI-SC-1102.

  • Page 27: Theory Of Operation

    Chapter Theory of Operation This chapter contains a functional overview of the VXI-SC-1102 and explains the operation of each functional unit. Functional Overview The block diagram in Figure 4-1 illustrates the key functional components of the VXI-SC-1102. CH 0 + Lowpass Inst.

  • Page 28: Vxibus Interface

    VXIbus Interface The VXI-DAQ module controls the VXI-SC-1102 over the VXIbus. The VXI-SC-1000 carrier module serves as an interface from the VXI-SC-1102 to the VXIbus. Digital Control Circuitry The digital control circuitry consists of the address handler and the following registers: Module ID, Configuration, Status, EEPROM, Gain, and Channel.

  • Page 29: Analog Circuitry

    Analog Output The 32 input channels and the CJSENSOR are multiplexed into one output. This output is passed to the VXI-SC-1000 carrier module, where it is connected to the Analog Bus for measurement by a VXI-MIO module.

  • Page 30: Calibration

    Chapter Calibration This chapter discusses the calibration procedures for the VXI-SC-1102. Using the procedure described in this chapter, you will be able to calculate the gain error and voltage offset on a per channel per gain basis. You can store these constants in the onboard EEPROM for future use and for automatic calibration when you are using National Instruments software.

  • Page 31: Gain And Offset Calibration

    Chapter 5 Calibration and reading the measured value. This value, the DMM offset, must be subtracted from all subsequent measurements. Measure the submodule’s output at the analog bus receptacle (see Figure 1-1 for the location of this receptacle). Refer to Figure 5-1 to connect the positive DMM input to MUX+ and the negative DMM input to MUX-.
  • Page 32 Chapter 5 Calibration Note: To make one of your calibration points the zero point, connect the positive and negative channel leads to one of the chassis ground pins on the front connector or terminal block. b. Measure the input voltage with the DMM. Call the measured voltage input1.

  • Page 33: Sample Program For Calibration

    Utility must be run to configure the VXI-SC chassis and to configure the DAQ board which will be used to communicate with the VXI-SC-1102. The program is written to work for a DAQ board, such as the VXI-MIO-64E-1, with a 5 V full-scale input. #include <stdio.h>...
  • Page 34 = 0, dummyDAQboard, dummyDAQchan = 0, dummyDAQgain = 1, dummyDAQrange; /* These dummy variables would be used if the measurement actually came from a DAQ board and not an external DMM. */ © National Instruments Corporation 5-37 VXI-SC-1102 User Manual...
  • Page 35 = enterInt ("Enter slot of the VXI-SC-1102: "); } while (moduleSlot < 1 || N_VXI_SC_SLOTS < moduleSlot); commPath = enterInt ("Enter device number of the DAQ board" "controlling the chassis: "); } while (commPath < 0); dummyDAQboard = commPath;...
  • Page 36 = enterFloat ("Enter VXI-SC-1102 output voltage: "); /* User enters vOutput2. */ binOutput1= vOutput1*scale; binOutput2= vOutput2*scale; /* Convert to DAQ board's format. */ SCXI_Cal_Constants (vxiChassisID, moduleSlot, moduleChan, 2, NIDAQMEM, dummyRangeCode, gain, dummyDAQboard, dummyDAQchan, dummyDAQgain, 1, vInput1, binOutput1, vInput2, binOutput2, &binOffset, &gainerr);...

  • Page 37: Appendix A Specifications

    Appendix Specifications This appendix lists the specifications for the VXI-SC-1102. These specifications are typical at 25° C unless otherwise noted. Analog Input Input Characteristics Number of channels ....... 32 differential Input signal ranges ......... ±100 mV (gain = 100) or ±10 V (gain = 1) Max working voltage (signal + common mode) .......
  • Page 38 Appendix A Specifications Gain = 100 After calibration .......0.017% of reading max Before calibration.....0.1% of reading Amplifier Characteristics Input impedance Normal powered on ......> 1 GΩ Powered off ........10 kΩ Overload ..........10 kΩ Input bias current ........±0.5 nA Input offset current .........±1.0 nA CMRR 50 to 60 Hz, either gain ....110 dB 0 Hz, gain 1........75 dB min...
  • Page 39 Appendix A Specifications Step response (either gain) To 0.1%........... 1 s To 0.01%......... 10 s Stability Recommended warm-up time ....20 min. Offset temperature coefficient Gain = 1 .......... 20 µV/°C Gain = 100 ........1 µV/°C Gain temperature coefficient....10 ppm/°C Physical Dimensions..........

  • Page 40: Appendix B Customer Communication

    Appendix Customer Communication For your convenience, this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation. When you contact us, we need the information on the Technical Support Form and the configuration form, if your manual contains one, about your system configuration to answer your questions as quickly as possible.
  • Page 41 Fax-on-Demand Support Fax-on-Demand is a 24-hour information retrieval system containing a library of documents on a wide range of technical information. You can access Fax-on-Demand from a touch-tone telephone at (512) 418-1111. E-Mail Support (currently U.S. only) You can submit technical support questions to the applications engineering team through e-mail at the Internet address listed below.
  • Page 42 Technical Support Form Photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
  • Page 43 VXI-SC-1102 Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration.
  • Page 44 Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: VXI-SC-1102 User Manual Edition Date: February 1997 Part Number: 321385A-01 Please comment on the completeness, clarity, and organization of the manual. _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________...

  • Page 45: Glossary

    Glossary Prefix Meaning Value pico- nano- µ- micro- milli- kilo- mega- giga- Numbers/Symbols +5 V +5 volt signal ° degrees Ω ohms percent ± plus or minus alternating current analog-to-digital © National Instruments Corporation VXI-SC-1102 User Manual...
  • Page 46 Glossary analog-to-digital converter–an electronic device, often an integrated circuit, that converts an analog voltage to a digital number amplification a type of signal conditioning that improves accuracy in the resulting digitized signal and reduces noise application programming interface the group of conductors that interconnect individual circuitry in a computer.
  • Page 47 DAQ board filtering a type of signal conditioning that allows you to filter unwanted signals from the signal you are trying to measure gain—the factor by which a signal is amplified, sometimes expressed in...
  • Page 48 Glossary logical address An 8-bit number that uniquely identifies each VXIbus device in a system. It defines the A16 register addresses of a device, and indicates Commander and Servant relationships. least significant bit mainframe The chassis of a VXIbus system that mechanically contains VXI modules inserted into the backplane, ensuring that connectors fit properly and that adjacent modules do not contact each other.
  • Page 49 VISA a new driver software architecture developed by National Instruments to unify instrumentation softwareGPIB, DAQ, and VXI. It has been accepted as a standard for VXI by the VXIplug&play Systems Alliance. © National Instruments Corporation VXI-SC-1102 User Manual...
  • Page 50 Glossary volts, output high volts, output low VXIbus VMEbus eXtensions for Instrumentation VXIplug&play A group of VXI developers dedicated to making VXI devices as Systems Alliance easy to use as possible, primarily by simplifying software development waveform a time-varying physical phenomenon, often measured in voltage VXI-SC-1102 User Manual ©...

  • Page 51: Index

    Index Numbers signal terminals, 3-3 Channel Register, 4-2 +5 V signal (table), 3-3 CJSENSOR signal cold-junction sensor connection, 3-6 description (table), 3-3 address handler, 4-2 exceeding overvoltage protection analog circuitry, 4-3 (warning), 3-6 analog input channels, 4-3 cold-junction sensor connection, 3-6 analog output, 4-3 common-mode input signal range, 3-4 analog input specifications, A-1 to A-2...
  • Page 52 Module ID Register, 4-2 signal terminals for input channels, 3-3 software programming choices, 1-3 to 1-5 National Instruments application NI-DAQ driver software, 1-4 to 1-5 software, 1-3 to 1-4 NI-DAQ driver software, 1-4 to 1-5 VXI-SC-1102 User Manual I -2...
  • Page 53 1-3 to 1-5 dynamic characteristics, A-2 National Instruments application software, 1-3 to 1-4 input characteristics, A-1 NI-DAQ driver software, 1-4 to 1-5 transfer characteristics, A-1 to A-2 VXIplug&play instrument driver, 1-5 environment, A-3 unpacking, 1-6 filters, A-2 to A-3...

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