1. Manuals
  2. Brands
  3. DAQ Manuals
  4. Control Unit
  5. VXI-SC-1102
  6. User manual

DAQ VXI-SC-1102 User Manual

32-channel multiplexer amplifier module
Hide thumbs Also See for VXI-SC-1102:
Table of Contents

Advertisement

Quick Links

Download this manual
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.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the VXI-SC-1102 and is the answer not in the manual?

Questions and answers

Related Manuals for DAQ VXI-SC-1102

Summary of Contents for DAQ VXI-SC-1102

  • Page 1 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 2 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 3: Important Information

    Important Information Warranty The VXI-SC-1102 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

    National Instruments Documentation ................xi Customer Communication .................... xi Chapter 1 Introduction 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 ..............
  • Page 5 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 6 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 7: About This Manual

    This manual describes the electrical and mechanical aspects of the VXI-SC-1102 and contains information concerning its installation and operation. The VXI-SC-1102 is a signal conditioning submodule in the VXI-data acquisition (VXI-DAQ) line of National Instruments products. The VXI-SC-1102 is designed for signal conditioning of thermocouples, volt and millivolt sources, and 4 to 20 mA sources or 0 to 20 mA process-current sources.

  • Page 8: Conventions Used In This Manual

    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. Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the Glossary. VXI-SC-1102 User Manual © National Instruments Corporation...

  • Page 9: National Instruments Documentation

    About This Manual 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 10: 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 11: About The Vxi-Sc-1102

    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. Your VXI-SC-1000 carrier module is shipped with a filler panel installed in one of the submodule sites.

  • Page 12: What You Need To Get Started

    Chapter 1 Introduction What You Need to Get Started To set up and use your VXI-SC-1102, you will need the following items: VXI-SC-1102 submodule VXI-SC-1102 User Manual VXI-SC-1000 carrier module and documentation VXI-MIO module and documentation One of the following software packages and documentation:...

  • Page 13: 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 14: 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 15: Optional Equipment

    For more specific information about these products, refer to your National Instruments catalogue or call the office nearest you. Unpacking Your VXI-SC-1102 submodule is shipped in an antistatic package to prevent electrostatic damage to the submodule. Electrostatic discharge can damage several components on the submodule. To avoid such damage in handling the submodule, take the following precautions.

  • Page 16: 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. © National Instruments Corporation...
  • Page 17 Chapter 2 Installation 4 RCL x Pads 1 Serial Number 2 Product Name 3 Assembly Number VXI-SC-1102 User Manual 2-20 © National Instruments Corporation...

  • Page 18: Current-Loop Receivers

    Chapter 2 Installation Figure 2-1. VXI-SC-1102 Parts Locator Diagram Current-Loop Receivers The VXI-SC-1102 has pads for transforming individual channels to current-to-voltage converters. National Instruments offers an SCXI Process Current Resistor Kit of four 249 , 0.1%, 5 ppm, 1/4 W resistors.

  • Page 19: 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 20: Signal Connections

    Front Connector Figure 3-1 shows the pin assignments for the VXI-SC-1102 front connector. © National Instruments Corporation 3-23...

  • Page 21: Figure 3-1. Vxi-Sc-1102 Front Connector Pin Assignments

    CH22+ CH23- CH23+ CH24- CH24+ CH25- CH25+ CH26- CH26+ CGND CH27- CH27+ CJSENSOR CH28- CH28+ CJSENSOR CH29- CH29+ CGND CH30- CH30+ +5 V CH31- CH31+ Figure 3-1. VXI-SC-1102 Front Connector Pin Assignments VXI-SC-1102 User Manual 3-24 © National Instruments Corporation...

  • Page 22: Signal Descriptions

    The differential input signal range of a VXI-SC-1102 input channel is 10 V/G, where G is the gain selected on the VXI-SC-1102 input channel. This differential input range is the maximum measurable voltage difference between the positive and negative channel inputs.

  • Page 23: Ground-Referencing Your Signals

    VXI-MIO module. National Instruments is liable for any injuries resulting from such signal connections. Applying a voltage greater than 42 VAC peak or VDC to the VXI-SC-1102 is an electrical shock hazard. National Instruments is liable for any damages or injuries resulting from such voltage application.

  • Page 24: 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 25: Cold-Junction Sensor Connection

    National Instruments VXI-TB Series terminal block to the VXI-SC-1102. The CJSENSOR signal is measured relative to CGND. Pins A3 and A4 are connected within the VXI-SC-1102 so the position of the MTEMP/DTEMP switch on the VXI-TB Series terminal block does not matter.

  • Page 26: 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 27: Vxibus Interface

    The VXI-SC-1102 consists of 32 multiplexed input channels, each with a software-programmable gain of 1 or 100. Each input channel has its own lowpass filter with a cutoff frequency of 2 Hz. The VXI-SC-1102 also has digital control circuitry for automatic control of channel scanning, temperature sensor selection, and gain selection.

  • Page 28: Analog Circuitry

    The 3 s scan interval gives you a maximum sampling rate of 333 kHz. Because each VXI-SC-1102 channel contains a 2 Hz lowpass filter, the 333 kHz sample rate allows you to sample multiple channels without undersampling any channel.

  • Page 29: Calibration

    EEPROM. However, National Instruments recommends that you recalibrate your VXI-SC-1102 at least once per year or when you operate the submodule outside the 20 to 30 C temperature range. If you are not using National...

  • Page 30: Gain And Offset Calibration

    Gain and Offset Calibration To determine the offset and gain calibration factors of the VXI-SC-1102 for a given gain, perform the following steps for a two-point calibration. For two-point calibration, it is best to use input voltages that correspond to the signal range of interest. For example, to measure bipolar voltages over the submodule’s full input range, choose...
  • Page 31 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. © National Instruments Corporation 5-35 VXI-SC-1102 User Manual...

  • Page 32: 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 33 = 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 34 = 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 35 = enterFloat ("Enter VXI-SC-1102 input voltage: "); /* User enters vInput1. */ vOutput1 = enterFloat ("Enter VXI-SC-1102 output voltage: "); /* User enters vOutput1. */ printf("Apply input voltage for point 2, channel %d, gain %.0f.\n",moduleChan, gain); vInput2 = enterFloat ("Enter VXI-SC-1102 input voltage:...

  • Page 36: 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...

  • Page 37: Dynamic Characteristics

    Scan interval (per channel, any gain) 0.012%..........3 s 0.0061%...........10 s System noise (related to input Gain = 1 ...........50 Vrms Gain = 100 ........5 Vrms Filters Cutoff frequency (-3 dB) ......2 Hz NMR (60 Hz)..........40 dB VXI-SC-1102 User Manual A-42 © National Instruments Corporation...

  • Page 38: Power Requirements

    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 © National Instruments Corporation A-43 VXI-SC-1102 User Manual...

  • Page 39: Appendix B Customer Communication

    To access our FTP site, log on to our Internet host, ftp.natinst.com, as anonymous and use your Internet address, such as joesmith@anywhere.com, as your password. The support files and documents are located in the /support directories. © National Instruments Corporation VXI-SC-1102 User Manual...
  • Page 40 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 41 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 42 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 43 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 44 Glossary Prefix Meaning Value pico- nano- micro- milli- kilo- mega- giga- Numbers/Symbols +5 V +5 volt signal degrees ohms percent plus or minus alternating current analog-to-digital © National Instruments Corporation VXI-SC-1102 User Manual...
  • Page 45 (2) collecting and measuring the same kinds of electrical signals with A/D and/or DIO boards plugged into a VXI-SC-1102 User Manual © National Instruments Corporation...
  • Page 46 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 47 CRT displays, computers, electrical storms, welders, radio transmitters, and internal sources such as semiconductors, resistors, and capacitors. Noise corrupts signals you are trying to send or receive. Return Material Authorization VXI-SC-1102 User Manual © National Instruments Corporation...
  • Page 48 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 49 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 © National Instruments Corporation...
  • Page 50 1-6 channel input signal connections, 3-3 to 3-4 common-mode input signal range, 3-4 differential input signal range, 3-3 Fax-On-Demand support, B-2 exceeding input levels and ranges filler panel, 1-2 (warning), 3-4 © National Instruments Corporation I -1 VXI-SC-1102 User Manual...
  • Page 51 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 52 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...

Table of Contents