National Instruments VXI-SC-1102 User Manual
VXI-SC-1102/B/C
User Manual
32-Channel Multiplexer Amplifier Submodules
August 1997 Edition
Part Number 321385B-01
© Copyright 1997 National Instruments Corporation. All rights reserved.
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Important Information
Warranty
The VXI-SC-1102,VXI-SC-1102B, and VXI-SC-1102C submodules 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. This warranty includes parts and labor.
The media on which you receive National Instruments software are warranted not to fail to execute programming
instructions, due to defects in materials an d work manship, fo r a pe riod of 90 days from date of shipment , as evi denced
by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do
not execute programming instructions if National Instruments receives notice of such defects during the warranty
period. National Instruments does not warrant that the operation of the software shall be uninterrupted or error free.
A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside
of the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping
costs of returning to the owner parts which are covered by warranty.
National Instruments believes that the information in this manual is accurate. The document has been carefully
reviewed for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves
the right to make changes to subseq uent editio ns of th is do cum ent wi thout prio r not ice to ho lders of this edit ion. Th e
reader should consult National Instruments if errors are suspected. In no event shall National Instruments be liable for
any damages arising out of or related to this document or the information contained in it.
XCEPT AS SPECIFIED HEREIN
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SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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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. The warranty provided
herein does not cover damages, defects, malfunctions, or service failures caused by owner’s failure to follow the
National Instruments installation, operation, or maintenance instructions; owner’s modification of the product;
owner’s abuse, misuse, or negligent acts; and power failure or surges, fire, flood, accident, actions of third parties, or
other events outside reasonable control.
ATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND
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Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical,
including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part,
without the prior written consent of National Instruments Corporation.
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. Applications of National Instruments products involving
medical or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on the
part of the user or application designer. Any use or application of National Instruments products for or involving
medical or clinical treatment must be performed by properly trained and qualified medical perso nnel, and all traditi onal
medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent serious injury
or death should always continue to be used when National Instruments products are being used. National Instruments
products are NOT intended to be a substitute for any form of established process, procedure, or equipment used to
monitor or safeguard human health and safety in medical or clinical treatment.
About This Manual
Organization of This Manual........................................................................................ix
Conventions Used in This Manual................................................................................x
National Instruments Documentation...........................................................................xi
Related Documentation.......................................... .......................................................xii
Customer Communication............................................................................................ xii
Chapter 1
Introduction
About the VXI-SC-1102/B/C .......................................................................................1-2
What You Need to Get Started .....................................................................................1-3
Software Programming Choices...................................................................................1-4
National Instruments Application Software................................................... 1-4
NI-DAQ Driver Software...............................................................................1-5
VXIplug&play Instrument Driver..................................................................1-6
Optional Equipment......................................................................................................1-6
Unpacking.....................................................................................................................1-7
Table
of
Contents
Chapter 2
Installation
Current-Loop Receivers................................................................................................2-3
Installing Your Hardware .............................................................................................2-4
Chapter 3
Signal Connections
Front Connector.............................................................. ..................................... .........3-1
Signal Descriptions........................................................................................3-3
Channel Input Signal Connections.................................................................3-3
Ground-Referencing Your Signals...................................................3-4
Cold-Junction Sensor Connection..................................................................3-6
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National Instruments Corporation v VXI-SC-1102/B/C User Manual
Table of Contents
Chapter 4
Theory of Operation
Functional Overview....................................................................................................4-1
VXIbus Interface..........................................................................................................4-2
Digital Control Circuitry .............................................................................................. 4-2
Analog Circuitry........................................................................................................... 4-3
Analog Input Channels................................................................................... 4-3
Analog Output ................................................................................................4-4
Chapter 5
Calibration
Calibration Equipment Requirements .......................................................................... 5-1
Gain and Offset Calibration..........................................................................................5-2
Appendix A
Specifications
Appendix B
Calibration Sample Program
Sample Program for Calibration................................................................................... B-1
Appendix C
Customer Communication
Glossary
Index
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..................... 1-6
Figure 2-1. VXI-SC-1102/B/C Parts Locator Diagram ........................................... 2-2
Figure 2-2. Bent and Trimmed Resistor................................................................... 2-3
VXI-SC-1102/B/C User Manual vi
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Tables
Table of Contents
Figure 3-1. VXI-SC-1102/B/C Front Connector Pin Assignments..........................3-2
Figure 3-2. Ground-Referenced Signal Connection.................................................3-5
Figure 3-3. Floating Signal Connection Referenced to Chassis Ground..................3-6
Figure 4-1. VXI-SC-1102/B/C Block Diagram........................................................4-1
Figure 5-1. Analog Bus Receptacle Pin Assignment ...............................................5-2
Table 3-1. Front Connector Signal Descriptions.....................................................3-3
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About
This
Manual
This manual describes the electrical and mechanical aspects of the
VXI-SC-1102 family and contains information concerning their
installation and operation. The VXI-SC-1102 family is a group of signal
conditioning submodules in the VXI-data acquisition (VXI-DAQ) line
of National Instruments products.
The VXI-SC-1102 family consists of the following submodules:
• VXI-SC-1102
• VXI-SC-1102B
• VXI-SC-1102C
Unless otherwise noted, VXI-SC-1102/B/C will hereafter refer to all
three submodules in the VXI-SC-1102 family.
The VXI-SC-1102/B/C submodules are designed for signal
conditioning of thermocouples, volt and millivolt sources, and
4–20 mA sources or 0–20 mA process-current sources. The
VXI-SC-1102/B/C submodules have 32 differential analog input
channels and one cold-junction sensor channel.
Organization of This Manual
The VXI-SC-1102/B/C User Manual is organized as follows:
• Chapter 1, Introduction, describes the VXI-SC-1102 family of
submodules, lists what you need to get started, optional software
and optional equipment, and explains how to unpack yo ur
VXI-SC-1102/B/C submodule.
• Chapter 2, Installation, describes how to install current-loop
receivers on your VXI-SC-1102/B/C and gives information about
installing your VXI-SC-1102/B/C into the VXI-SC-1000 carrier
module.
• Chapter 3, Signal Connections, describes the analog input signal
connections to the VXI-SC-1102/B/C submodule via the front
connector.
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About This Manual
• Chapter 4, Theory of Operation , contains a functional overview of
the VXI-SC-1102/B/C submodules and explains the operation of
each functional unit.
• Chapter 5, Calibration, discusses the calibration procedures for the
VXI-SC-1102/B/C submodules.
• Appendix A, Specifications, lists the specifications for the
VXI-SC-1102/B/C submodules.
• Appendix B, Calibration Sample Program, contains a sample
program to help you calibrate your submodule.
• Appendix C, Customer Communication, contains forms you can
use to request help from National Instruments or to comment on
our products.
•The Glossary contains an alphabetical list and description of terms
used in this manual, including abbreviations, acronyms, metric
prefixes, mnemonics, symbols, and general data acquisition terms.
•The Index contains an alphabetical list of key terms and topics in
this manual, including the page where you can find each one.
Conventions Used in This Manual
The following conventions are used in this manual.
< > Angle brackets containing numbers separated by an ellipsis represent a
range of values associated with a port, b it, or signal name (f or example,
ACH<0..7> stands for the signals ACH0 through ACH7).
♦ The ♦ symbol indicates that the text following it applies only to specific
VXI-SC-1102 modules.
This icon to the left of bold italicized text denotes a note, which alerts
you to important information.
!
bold italic Bold italic text denotes a note, caution, or warning.
italic Italic text denotes emphasis, a cross reference, or an introduction to a
monospace Denotes text or characters that are to be literally input from the
VXI-SC-1102/B/C User Manual x
This icon to the left of bold italicized text denotes a caution, which
advises you of precautions to take to avoid injury, data loss, or a
system crash.
This icon to the left of bold italicized text denotes a warning, which
advises you of precautions to take to avoid being electrically shocked.
key concept.
keyboard, sections of code, programming examples, and syntax
©
National Instruments Corporation
About This Manual
examples. This font is also used for the proper names of disk drives,
paths, directories, programs, subprograms, subroutines, device names,
functions, variables, file names, and extensions, and for statements and
comments taken from program code.
carrier module Refers to the VXI-SC-1000, which plugs directly into a VXI slot and on
which VXI-SC submodules are installed.
PC Refers to the IBM PC/XT, the IBM PC AT, and compatible computers.
SCMP Refers to the signal conditioning minipods in the VXI signal
conditioning system.
VXI-MIO module Refers to any of the National Instruments VXI-MIO series of plug-in
data acquisition devices.
VXI-SC submodule Refers to VXI signal conditioning hardware that installs onto the carrier
module.
VXI-SC-1102/B/C Refers to all submodules in the VXI-SC-1102 family, unless otherwise
submodules noted.
The Glossary lists abbreviations, acronyms, metric prefixes,
mnemonics, symbols, and terms.
National Instruments Documentation
The VXI-SC-1102/B/C 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:
• Your VXI-DAQ hardware documentation—These documents have
detailed information about the V XI-DAQ hardware that plugs into
or is connected to your VXIbus chassis. Use these documents for
hardware installation and configuration instructions, specification
information about your VXI-DAQ hardware, and application hi nts.
• Software documentation—You may have both application software
and driver software documentation. National Instruments
application software includes ComponentWorks, LabVIEW,
LabWindows
Instruments driver software includes NI-DAQ and VXIplug&play
instrument drivers. After you set up your hardware system, use
either your application or driver software documentation to help
you write your application. If you have a large, complicated
system, it is worthwhile to look through the software
documentation before you configure your hardware.
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National Instruments Corporation xi VXI-SC-1102/B/C User Manual
®
/CVI, Measure, and VirtualBench. National
About This Manual
• Accessory installation guides or manuals—If you are using
accessory products, read the terminal block and cable assembly
installation guides or accessory device user manuals. They explain
how to physically connect the relevant pieces of the system.
Consult these guides when you are making your connections.
Related Documentation
The following document contains information you may find helpful:
• VXI-SC-1000 Carrier Module Installation Guide
Customer Communication
National Instruments wants to receive your comments on our products
and manuals. We are interested in the applications you develop with our
products, and we want to help if you have problems with them. To make
it easy for you to contact us, this manual contains comment and
configuration forms for you to complete. These forms are in
Appendix C, Customer Communication, at the end of this manual.
VXI-SC-1102/B/C User Manual xii
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National Instruments Corporation
Chapter
Introduction
This chapter describes the VXI-SC-1102 family of submodules; lists
what you need to get started, optional soft ware, and optional equipment;
and explains how to unpack your VXI-SC-1102/B/C submodule.
The VXI-SC-1102 family 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.
2
1
4
3
5
To VXIbus
Chassis
6
8
1
9
1 Analog Bus Receptacle
2 SCMPs
3 SCMP Socket
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National Instruments Corporation 1-1 VXI-SC-1102/B/C User Manual
4 Address Switch
5 VXI-SC Subslot 1
6 VXI-SC Subslot 2
Figure 1-1.
7 VXI-SC Carrier Module
8 VXI-SC-1150 Submodule
9 VXI-SC Submodule
VXI Signal Conditioning System
7
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/B/C 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. This filler panel is necessary for
the attachment of the front panel, so you should leave it in place until
you are ready to install a VXI-SC submodule.
About the VXI-SC-1102/B/C
♦ The VXI-SC-1102 is a submodule for the signal conditioning of
thermocouples, low-bandwidth volt and millivolt sources, 4-20 mA current
sources, and 0-20 mA process-current sources. The VXI-SC-1102 has
32 differential analog input channels and one cold-junction sensor channel.
On each channel, the VXI-SC-1102 has a three-pole lowpass filter with a
2 Hz cutoff frequency to reject 60 Hz noise. Each channel also has an
amplifier with a selectable gain of 1 or 100. You can multiplex the
VXI-SC-1102 inputs to a single output, which drives a single VXI-MIO
module channel.
♦ The VXI-SC-1102B is a submodule for the signal conditioning of
thermocouples, medium-bandwidth volt and millivolt sources, 4-20 mA
current sources, and 0-20 mA process-current sources. The
VXI-SC-1102B has 32 differential analog input channels and one
cold-junction sensor channel. On each channel, the VXI-SC-1102B has a
three-pole lowpass filter with a 200 Hz cutoff frequency. Each channel also
has an amplifier with a selectable gain of 1 or 100. You can multiplex the
VXI-SC-1102B inputs to a single output, which drives a single VXI-MIO
module channel.
♦ The VXI-SC-1102C is a submodule for the signal conditioning of
thermocouples, high-bandwidth volt and millivolt sources, 4-20 mA
current sources, and 0-20 mA process-current sources. The
VXI-SC-1102C has 32 differential analog input channels and one
cold-junction sensor channel. On each channel, the VXI-SC-1102C has a
three-pole lowpass filter with a 10 kHz cutoff frequency. Each channel also
has an amplifier with a selectable gain of 1 o r 100. You can multiplex the
VXI-SC-1102C inputs to a single output, which drives a single VXI-MIO
module channel.
VXI-SC-1102/B/C User Manual 1-2
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National Instruments Corporation
The VXI-SC-1102/B/C submodules operate with full functionality with
National Instruments VXI-MIO modules. You can multiplex several
VXI-SC-1102/B/C submodules and other VXI signal conditioning
submodules into a single channel on the VXI-MIO module, greatly
increasing the number of analog input signals that you can digitize.
You can also use National Instruments terminal blocks, which have
screw terminals to which you attach the input signals for the
VXI-SC-1102/B/C submodules. In addition, some of these terminal
blocks have a temperature sensor for thermocouple cold-junction
compensation (CJC). The VXI-SC-1102/B/C submodules multiplex
this cold-junction sensor with the 32 input channels during a hardware
scan. A National Instruments isothermal terminal block is
recommended for thermocouple applications.
Detailed specifications of the VXI-SC-1102/B/C submodules are listed
in Appendix A, Specifications.
What You Need to Get Started
To set up and use your VXI-SC-1102/B/C, you will need the following
items:
Chapter 1 Introduction
❑ One of the following submodules:
VXI-SC-1102
VXI-SC-1102B
VXI-SC-1102C
❑ VXI-SC-1102/B/C User Manual
❑ VXI-SC-1000 carrier module and documentation
❑ VXI-MIO module and documentation
❑ One of the following software packages and documentation:
ComponentWorks
LabVIEW for Windows
LabWindows/CVI for Windows
Measure
NI-DAQ for PC compatibles
VirtualBench
VXIplug&play instrument driver
❑ Your VXIbus system
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Chapter 1 Introduction
Software Programming Choices
There are several options to choose from when programming your
National Instruments VXI-DAQ hardware. You can use LabVIEW,
LabWindows/CVI, ComponentWorks, VirtualBench, or other
application development environments with either NI-DAQ or
the VXIplug&play instrument driver. Both NI-DAQ and the
VXIplug&play instrument driver access the VXI-DAQ hardware
through the VISA driver software.
National Instruments Application Software
LabVIEW features interactive graphics, a state-of-the-art user
interface, and a powerful graphical programming language. 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.
LabWindows/CVI features interactive graphics, a state-of-the-art user
interface, and uses the ANSI standard C programming language. The
LabWindows/CVI Data Acquisition Library, a series of functions for
using LabWindows/CVI with National Instruments DAQ hardware, is
included with the NI-DAQ software kit. The LabWindows/CVI Data
Acquisition Library is functionally equivalent to the NI-DAQ so ftware.
ComponentWorks contains tools for data acquisition and instrument
control built on NI-DAQ driver software. Compo nentWorks provi des a
higher-level programming interface for building virtual instruments
through standard OLE controls and DLLs. With ComponentWork s, you
can use all of the configuration tools, resource management utilities,
and interactive control utilities included with NI-DAQ.
VirtualBench features VIs that combine DAQ products, software, and
your computer to create a stand-alone instrument with the added benefit
of the processing, display, and storage capabilities of your computer.
VirtualBench instruments load and save waveform data to disk in the
same forms that can be used in popular spreadsheet programs and word
processors.
Using LabVIEW, LabWindows/CVI, ComponentWorks, or
VirtualBench software will greatly reduce the development time for
your data acquisition and control application.
VXI-SC-1102/B/C User Manual 1-4
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National Instruments Corporation
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. These functions
include routines for analog input (A/D conversion), buffered data
acquisition (high-speed A/D conversion), analog output
(D/A conversion), waveform generation, digital I/O, counter/timer
operations, SCXI, RTSI, self-calibration, messaging, and acquiring
data to extended memory .
NI-DAQ has both high-level DAQ I/O functions for maximum ease
of use and low-level DAQ I/O functions for maximum flexibility and
performance. Examples of high-level functions are streaming data to
disk or acquiring a certain number of data points. An example of a
low-level function is writing directly to registers on the DAQ device.
NI-DAQ does not sacrifice the performance of National Instruments
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.
Chapter 1 Introduction
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Chapter 1 Introduction
VXI
plug&play
Instrument Driver
National Instruments distributes VXIplug&play instrument drivers free
of charge. VXIplug&play instrument drivers are one level above the
NI-DAQ device driver and contain high-level software functions whose
architecture is specified by the VXIplug&play Systems Alliance. The
VXIplug&play standards increase interoperability with other vendors,
and ensure that drivers are designed and presented in a consistent
fashion that facilitates ease of use. Refer to Figure 1-2 to see the
relationship between your VXI-DAQ hardware and your software.
Figure 1-2.
Optional Equipment
National Instruments offers a variety of products to use with your
VXI-SC-1102/B/C submodule, as follows:
• Terminal blocks and 96-pin cables that allow you to attach input
signals to your submodule
• SCXI Process Current Resistor Kit
ComponentWorks,
LabVIEW, LabWindows/CVI,
or VirtualBench
plug&play
VXI
Instrument Driver
NI-DAQ Driver Software
VISA
VXI-DAQ Hardware
The Relationship between the Programming Environment,
Your Instrument Driver, and Your VXI-DAQ Hardware
Other Application
Development Environments
For more specific information about these products, refer to your
National Instruments catalogue or call the office nearest you.
VXI-SC-1102/B/C User Manual 1-6
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National Instruments Corporation
Unpacking
Chapter 1 Introduction
Your VXI-SC-1102/B/C 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:
• Ground yourself via a grounding strap or by holding a grounded
object.
• Touch the antistatic package to a metal part of your VXIbus chassis
before removing the submodule from the package.
• Remove the submodule from the package and inspect the
submodule for loose components or any other sign of damage.
Notify National Instruments if the module appears damaged in any
way. Do not install a damaged submodule into your VXIbus
chassis.
• Never touch the exposed pins of connectors.
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Chapter
Installation
2
This chapter describes how to install current-loop receivers on your
VXI-SC-1102/B/C and gives information about installing your
VXI-SC-1102/B/C into the VXI-SC-1000 carrier module.
Refer to Figure 2-1, VXI-SC-1102/B/C Parts Locator Diagram, for
information as you read the instructions in this chapter.
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