National Instruments Stereo Amplifier 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.  
 
 
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 and workmanship, for a period of 90 days from date of shipment, as evidenced  
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 subsequent editions of this document without prior notice to holders of this edition. The  
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.  
EXCEPT AS SPECIFIED HEREIN, NATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND  
SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
CUSTOMERS RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL  
INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER. NATIONAL INSTRUMENTS  
WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR  
CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. This limitation of the liability of National  
Instruments will apply regardless of the form of action, whether in contract or tort, including negligence. 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. 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.  
Copyright  
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 personnel, and all traditional  
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.  
 
Table  
of  
Conventions Used in This Manual................................................................................x  
National Instruments Documentation ...........................................................................xi  
Chapter 1  
Software Programming Choices ...................................................................................1-4  
NI-DAQ Driver Software...............................................................................1-5  
VXIplug&play Instrument Driver..................................................................1-6  
Chapter 2  
Chapter 3  
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  
© National Instruments Corporation  
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VXI-SC-1102/B/C User Manual  
 
Table of Contents  
Chapter 4  
Functional Overview .................................................................................................... 4-1  
Digital Control Circuitry .............................................................................................. 4-2  
Analog Circuitry........................................................................................................... 4-3  
Chapter 5  
Calibration Equipment Requirements .......................................................................... 5-1  
Calibration Sample Program  
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  
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© National Instruments Corporation  
 
Table of Contents  
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  
Tables  
Table 3-1.  
Front Connector Signal Descriptions.....................................................3-3  
© National Instruments Corporation  
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VXI-SC-1102/B/C User Manual  
 
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  
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 your  
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.  
© National Instruments Corporation  
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VXI-SC-1102/B/C User Manual  
 
   
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  
Chapter 5, Calibration, discusses the calibration procedures for the  
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, bit, or signal name (for 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.  
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.  
bold italic  
Bold italic text denotes a note, caution, or warning.  
italic  
Italic text denotes emphasis, a cross reference, or an introduction to a  
key concept.  
monospace  
Denotes text or characters that are to be literally input from the  
keyboard, sections of code, programming examples, and syntax  
VXI-SC-1102/B/C User Manual  
x
© 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  
submodules  
Refers to all submodules in the VXI-SC-1102 family, unless otherwise  
noted.  
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 VXI-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 hints.  
Software documentation—You may have both application software  
and driver software documentation. National Instruments  
application software includes ComponentWorks, LabVIEW,  
LabWindows®/CVI, Measure, and VirtualBench. National  
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.  
© National Instruments Corporation  
xi  
VXI-SC-1102/B/C User Manual  
 
 
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  
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© National Instruments Corporation  
 
   
Chapter  
1
Introduction  
This chapter 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 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.  
4
5
To VXIbus  
Chassis  
3
6
2
7
8
1
9
1
2
3
Analog Bus Receptacle  
SCMPs  
4
5
6
Address Switch  
VXI-SC Subslot 1  
VXI-SC Subslot 2  
7
8
9
VXI-SC Carrier Module  
VXI-SC-1150 Submodule  
VXI-SC Submodule  
SCMP Socket  
Figure 1-1. VXI Signal Conditioning System  
© National Instruments Corporation  
1-1  
VXI-SC-1102/B/C User Manual  
 
           
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 or 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  
© National Instruments Corporation  
 
 
Chapter 1  
Introduction  
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  
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:  
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  
© National Instruments Corporation  
1-3  
VXI-SC-1102/B/C User Manual  
 
 
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 software.  
ComponentWorks contains tools for data acquisition and instrument  
control built on NI-DAQ driver software. ComponentWorks provides a  
higher-level programming interface for building virtual instruments  
through standard OLE controls and DLLs. With ComponentWorks, 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  
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© National Instruments Corporation  
 
     
Chapter 1  
Introduction  
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.  
© National Instruments Corporation  
1-5  
VXI-SC-1102/B/C User Manual  
 
 
Chapter 1  
Introduction  
VXIplug&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.  
Other Application  
Development Environments  
ComponentWorks,  
LabVIEW, LabWindows/CVI,  
or VirtualBench  
VXIplug&play  
Instrument Driver  
NI-DAQ Driver Software  
VISA  
VXI-DAQ Hardware  
Figure 1-2. The Relationship between the Programming Environment,  
Your Instrument Driver, and Your VXI-DAQ Hardware  
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  
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  
© National Instruments Corporation  
 
       
Chapter 1  
Introduction  
Unpacking  
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.  
© National Instruments Corporation  
1-7  
VXI-SC-1102/B/C User Manual  
 
 
Chapter  
2
Installation  
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.  
© National Instruments Corporation  
2-1  
VXI-SC-1102/B/C User Manual  
 
       
Chapter 2  
Installation  
2
3
1
4
1
Serial Number  
2
Product Name  
3
Assembly Number  
4
RCLx Pads  
Figure 2-1. VXI-SC-1102/B/C Parts Locator Diagram  
VXI-SC-1102/B/C User Manual  
2-2  
© National Instruments Corporation  
 
   
Chapter 2  
Installation  
Current-Loop Receivers  
The VXI-SC-1102/B/C submodules have 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. The reference designators for the current  
loop resistors have the following format: for input channel x, the  
resistor is RCLx. For example, the resistor for channel 28 is RCL28.  
Caution: 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 your VXI-SC-1102/B/C submodule  
from the carrier assembly.  
2. Bend and trim the resistor lead as shown in Figure 2-2. Be sure that  
the resistor does not extend more than 0.65 in. above the surface of  
the circuit board.  
Figure 2-2. Bent and Trimmed Resistor  
3. Insert the resistor into the appropriate pad, labeled RCLx.  
4. Solder the leads to the pad on the bottom side of the module.  
5. Follow the instructions in the VXI-SC-1000 Carrier Module  
Installation Guide to replace the VXI-SC-1102/B/C submodule in  
the carrier assembly.  
© National Instruments Corporation  
2-3  
VXI-SC-1102/B/C User Manual  
 
     
Chapter 2  
Installation  
Installing Your Hardware  
Follow the instructions in the VXI-SC-1000 Carrier Module Installation  
Guide to install the assembled VXI-SC carrier module in the VXIbus  
chassis.  
VXI-SC-1102/B/C User Manual  
2-4  
© National Instruments Corporation  
 
 
Chapter  
3
Signal Connections  
This chapter describes the analog input signal connections to the  
VXI-SC-1102/B/C 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.  
!
Front Connector  
Figure 3-1 shows the pin assignments for the VXI-SC-1102/B/C  
submodule front connector.  
© National Instruments Corporation  
3-1  
VXI-SC-1102/B/C User Manual  
 
         
Chapter 3  
Signal Connections  
A
B
C
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
10  
9
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
10  
9
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
10  
9
CGND  
NC  
CH0-  
CH1-  
CH0+  
CH1+  
NC  
CH2-  
CH2+  
NC  
CH3-  
CH3+  
NC  
CH4-  
CH4+  
NC  
CH5-  
CH5+  
NC  
CH6-  
CH6+  
NC  
CH7-  
CH7+  
CGND  
NC  
CH8-  
CH8+  
CH9-  
CH9+  
NC  
CH10-  
CH11-  
CH12-  
CH13-  
CH14-  
CH15-  
CH16-  
CH17-  
CH18-  
CH19-  
CH20-  
CH21-  
CH22-  
CH23-  
CH24-  
CH25-  
CH26-  
CH27-  
CH28-  
CH29-  
CH30-  
CH31-  
CH10+  
CH11+  
CH12+  
CH13+  
CH14+  
CH15+  
CH16+  
CH17+  
CH18+  
CH19+  
CH20+  
CH21+  
CH22+  
CH23+  
CH24+  
CH25+  
CH26+  
CH27+  
CH28+  
CH29+  
CH30+  
CH31+  
NC  
NC  
NC  
NC  
NC  
CGND  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
8
8
8
NC  
7
7
7
NC  
6
6
6
CGND  
CJSENSOR  
CJSENSOR  
CGND  
+5 V  
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
Figure 3-1. VXI-SC-1102/B/C Front Connector Pin Assignments  
VXI-SC-1102/B/C User Manual  
3-2  
© National Instruments Corporation  
 
   
Chapter 3  
Signal Connections  
Signal Descriptions  
Table 3-1. Front Connector Signal Descriptions  
Pin  
Signal Name  
Description  
+5 VDC Source—Powers the  
A1  
+5 V  
temperature sensor on the terminal  
block. 0.2 mA of source not  
protected.  
A2, A5, A16,  
A24, A32  
CGND  
Chassis Ground—Tied to the  
VXIbus chassis.  
A3, A4  
CJSENSOR Cold-Junction Temperature  
Sensor Input—Connects to the  
temperature sensor of the terminal  
block.  
B1–B32  
C1–C32  
CH31-  
through  
CH0-  
Negative Input Channels 31–0  
—Negative side of differential  
input channels.  
CH31+  
through  
CH0+  
Positive Input Channels 31–0  
—Positive side of differential  
input channels.  
All other pins are not connected.  
Channel Input Signal Connections  
The signal terminals for the positive input channels are located in  
column C of the connector. The signal terminal for each corresponding  
negative input channel is located in column B of the connector. Each  
input goes to a separate filter and amplifier that is multiplexed to the  
module output buffer. The terminal block temperature sensor output—  
connected to pins A3 and A4 (CJSENSOR)—is also filtered and  
multiplexed to the module output buffer.  
The differential input signal range of a VXI-SC-1102/B/C input channel  
is ±10 V/G, where G is the gain selected on the VXI-SC-1102/B/C input  
channel. This differential input range is the maximum measurable  
voltage difference between the positive and negative channel inputs.  
The common-mode input signal range of a VXI-SC-1102/B/C input  
© National Instruments Corporation  
3-3  
VXI-SC-1102/B/C User Manual  
 
     
Chapter 3  
Signal Connections  
channel 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.  
Warning: Exceeding the input damage level (±42 VAC peak or VDC between input  
channels and chassis ground) can damage the VXI-SC-1102/B/C  
submodule, the VXIbus, and the VXI-MIO module. National Instruments  
is NOT liable for any injuries resulting from such signal connections.  
Applying a voltage greater than ±42 VAC peak or VDC to the  
VXI-SC-1102/B/C is an electrical shock hazard. National Instruments is  
NOT liable for any damages or injuries resulting from such voltage  
application.  
Note:  
in a distorted signal measurement.  
Ground-Referencing Your Signals  
Your input signals can be either ground-referenced, as shown in  
Figure 3-2, or floating, as shown in Figure 3-3. Before you connect  
your thermocouple or any other signal, determine whether it is floating  
or ground-referenced. If it is a floating signal, you must ground-  
reference the signal in one of two ways. You can connect the negative  
channel input to chassis ground as shown in Figure 3-3 or you can use  
the clamping resistors on a VXI-TB Series terminal block. The VXI-TB  
Series terminal block may also have a resistor pack for pulling up the  
positive inputs for open-thermocouple detection. Consult the terminal  
block installation guide for details.  
Do not ground signals that are already ground-referenced; doing so will  
result in a ground loop, which adversely affects your measurement  
accuracy.  
VXI-SC-1102/B/C User Manual  
3-4  
© National Instruments Corporation  
 
 
Chapter 3  
Signal Connections  
CH0 +  
CH0 -  
+
-
+
-
V
diff  
CH1 +  
CH1 -  
+
-
+
V
cm  
-
VXI-SC-1102/B/C  
Figure 3-2. Ground-Referenced Signal Connection  
© National Instruments Corporation  
3-5  
VXI-SC-1102/B/C User Manual  
 
   
Chapter 3  
Signal Connections  
CH0 +  
CH0 -  
+
-
+
Floating  
Signal  
V
s
-
CH1 +  
CH1 -  
+
-
Make this connection to  
ground reference the signal.  
CGND  
Reference to  
Chassis Ground  
VXI-SC-1102/B/C  
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/B/C. The CJSENSOR signal is measured relative to  
CGND. Pins A3 and A4 are connected together within the  
VXI-SC-1102/B/C so the position of the MTEMP/DTEMP switch on  
the VXI-TB Series terminal block does not matter. The input is  
overvoltage-protected to 15 VDC with the power on and off.  
Caution: Exceeding the overvoltage protection on the CJSENSOR input can damage  
the VXI-SC-1102/B/C submodule, the VXIbus, and the VXI-MIO board.  
National Instruments is NOT liable for any damages or injuries resulting  
from such signal connections.  
!
VXI-SC-1102/B/C User Manual  
3-6  
© National Instruments Corporation  
 
     
Chapter  
4
Theory of Operation  
submodules 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/B/C submodules.  
CH 0 +  
CH 0 –  
+
Inst.  
Amp  
Lowpass  
Filter  
Buffer  
Buffer  
Gain 0  
CH 31+  
CH 31 –  
+
Lowpass  
Filter  
Inst.  
Amp  
Buffer  
Analog Bus +  
Analog Bus -  
Switch  
Switch  
Digital  
Control  
Gain 31  
Gain  
Register  
CJSENSOR  
Lowpass  
Filter  
Buffer  
Calibration EEPROM  
Figure 4-1. VXI-SC-1102/B/C Block Diagram  
© National Instruments Corporation  
4-1  
VXI-SC-1102/B/C User Manual  
 
             
Chapter 4  
Theory of Operation  
The major components of the VXI-SC-1102/B/C submodules are as  
follows:  
VXIbus interface  
Digital control circuitry  
Analog circuitry  
The VXI-SC-1102/B/C submodules consist of 32 multiplexed input  
channels, each with a software-programmable gain of 1 or 100. Each  
input channel has its own lowpass filter. The VXI-SC-1102/B/C  
submodules also have digital control circuitry for automatic control of  
channel scanning, temperature sensor selection, and gain selection.  
VXIbus Interface  
The VXI-DAQ module controls the VXI-SC-1102/B/C over the  
VXIbus. The VXI-SC-1000 carrier module serves as an interface from  
the VXI-SC-1102/B/C submodules 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. The address handler controls which register is being  
addressed. The Module ID Register contains a code unique to each type  
of VXI-SC-1102/B/C submodule:  
VXI-SC-1102—The Module ID is 42 decimal.  
VXI-SC-1102B—The Module ID is 43 decimal.  
VXI-SC-1102C—The Module ID is 63 decimal.  
The Configuration Register configures the VXI-SC-1102/B/C  
submodules for the desired scanning mode and connection to the rear  
channels have settled after a change in the gains. The EEPROM  
Register is the address for interfacing with the submodule’s EEPROM,  
which contains calibration information. The Gain Register selects  
between gains of 1 or 100 for each of the 32 channels. The Channel  
Register selects a channel for a single measurement or a start channel  
for a scan. Refer to Software Programming Choices in Chapter 1,  
VXI-SC-1102/B/C User Manual  
4-2  
© National Instruments Corporation  
 
   
Chapter 4  
Theory of Operation  
Introduction, of this manual to learn about options for programming the  
control circuitry.  
Analog Circuitry  
The analog circuitry per channel consists of a lowpass filter and an  
amplifier with a software-selectable gain of 1 or 100. The CJSENSOR  
channel also has a buffered lowpass filter but has no amplifier. The  
channels and CJSENSOR are multiplexed to a single output buffer.  
Analog Input Channels  
Each of the 32 analog input channels drives a separate amplifier with a  
programmable gain of 1 or 100. Then the signal passes through a  
three-pole lowpass filter.  
Note:  
Because of the 2 Hz bandwidth of the VXI-SC-1102 input channels, you  
must wait approximately 3 s after changing the gains before the channels  
settle and you can take an accurate measurement. NI-DAQ automatically  
reads the Status Register to determine when the module output has settled.  
This time is approximately 100 ms and 1 ms for the VXI-SC-1102B and  
VXI-SC-1102C, respectively.  
The temperature sensor consists of a thermistor located on a National  
Instruments VXI terminal block. The temperature sensor is for  
cold-junction compensation of thermocouples. The CJSENSOR  
channel also passes through a 2 Hz lowpass filter to reject unwanted  
noise. Along with the other 32 input channels, the CJSENSOR is  
multiplexed to the output buffer, where it can be read by the VXI-MIO  
module.  
For a measurement accuracy of 0.012% of full scale, the minimum scan  
interval is 3 µs. This is the smallest interval in which you can switch  
between analog channels on the submodule and still measure accurate  
voltages. The 3 µs scan interval gives you a maximum sampling rate of  
333 kHz. Because each VXI-SC-1102/B/C channel contains a lowpass  
filter, the 333 kHz sample rate allows you to sample multiple channels  
without undersampling any channel.  
© National Instruments Corporation  
4-3  
VXI-SC-1102/B/C User Manual  
 
   
Chapter 4  
Theory of Operation  
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.  
VXI-SC-1102/B/C User Manual  
4-4  
© National Instruments Corporation  
 
 
Chapter  
5
Calibration  
This chapter discusses the calibration procedures for the  
VXI-SC-1102/B/C submodules.  
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. The VXI-SC-1102/B/C submodules come from  
the factory with factory-determined calibration constants in the  
EEPROM. However, National Instruments recommends that you  
recalibrate your VXI-SC-1102/B/C at least once per year or when you  
operate the submodule outside the 20° to 30° C temperature range.  
In order to calibrate the VXI-SC-1102/B/C, you will need to apply  
precision voltages to the channel inputs and/or ground the channel  
inputs.  
Calibration Equipment Requirements  
According to standard practice, the equipment you use to calibrate the  
VXI-SC-1102/B/C should be 10 times as accurate as the  
VXI-SC-1102/B/C submodule itself. Calibration equipment with four  
times the accuracy of the VXI-SC-1102/B/C is generally considered  
acceptable. To calibrate the VXI-SC-1102/B/C submodules, you need a  
voltmeter with the following specifications:  
Accuracy  
±6 ppm standard reading  
±15 ppm sufficient reading  
Range  
±10 V  
Resolution  
8.5 digits  
A multiranging 8.5-digit digital multimeter (DMM) can perform the  
necessary calibrations.  
To make sure that the DMM does not introduce an additional offset, you  
can determine the offset error of the DMM by shorting its leads together  
© National Instruments Corporation  
5-1  
VXI-SC-1102/B/C User Manual  
 
         
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-.  
MUX+ MUX-  
CAL- CAL+  
MUX-  
MUX+  
CAL+  
CAL-  
Figure 5-1. Analog Bus Receptacle Pin Assignment  
Gain and Offset Calibration  
To determine the offset and gain calibration factors of the  
VXI-SC-1102/B/C submodules 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 –9.9 V/G (negative full-scale) and +9.9 V/G (positive  
full-scale) as your two input voltages.  
1. Select the desired channel. Set the channel gain to the desired gain.  
2. Apply the input for the first calibration point. To select negative  
full scale as the calibration point, apply –9.9 V/G for an input  
voltage.  
a. Apply the input voltage to the channel selected in Step 1.  
VXI-SC-1102/B/C User Manual  
5-2  
© National Instruments Corporation  
 
     
Chapter 5  
Calibration  
Note:  
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.  
If you are using a calibrator that supplies accurate voltages, you can simply  
use the known applied voltage for input1instead of measuring.  
c. Measure the module output at the analog bus receptacle with  
the DMM. Call the measured voltage output1.  
3. Repeat Step 2, applying the input for the second calibration point.  
Call the measured voltages input2and output2. To select  
positive full scale as the calibration point, repeat Step 2 and apply  
+9.9 V/G.  
4. You now have two pairs of voltages (input1, output1) and  
(input2, output2). Each pair consists of an input voltage and an  
output voltage.  
5. Convert the output voltages from volt units to your VXI-MIO  
module binary unit. You must take into consideration the polarity  
of your VXI-MIO module, its resolution (12 bits or 16 bits), and  
gain. For example, if you are using the 12-bit VXI-MIO-64E-1 in  
bipolar mode with the gain set to G  
, your output voltages for the  
MIO  
autozeroing option will be represented in binary units as given by  
the following formula:  
Binary  
= ----------------- 2 12  
GMIO  
Output  
5 V  
For other VXI-MIO modules, refer to the device user manual to  
determine the appropriate formula.  
6. You now have a new set of pairs referred to as voltage binary pairs  
(input1, bin_output1) and (input2, bin_output2). Pass these  
pairs to the SCXI_Cal_Constantsfunction or VI as described in  
your software user documentation.  
Note:  
When you use 0 V and positive full-scale for your two calibration points,  
you eliminate the error at 0 V and at positive full-scale voltage. However,  
because of nonlinearity, the error at the negative full-scale voltage will be  
two times the nonlinearity error. 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  
5-3  
VXI-SC-1102/B/C User Manual  
 
Chapter 5  
Calibration  
When you make a measurement using LabVIEW, ComponentWorks, or  
VirtualBench, the driver automatically uses the calibration constants to  
correct the measured voltages.  
When you use application development environments other than  
LabVIEW, ComponentWorks, or VirtualBench, you have the option to  
apply the calibration constants to measured voltages through the  
NI-DAQ API.  
Refer to Appendix B, Calibration Sample Program, for an example of  
a calibration program for your submodule.  
VXI-SC-1102/B/C User Manual  
5-4  
© National Instruments Corporation  
 
Appendix  
A
Specifications  
This appendix lists the specifications for the VXI-SC-1102/B/C  
submodules. These specifications are typical at 25° C unless  
otherwise noted.  
VXI-SC-1102/B/C  
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) ....................Each input should remain  
within ±10 V of CGND  
Input damage level ............................... ±42 VAC peak or VDC  
Inputs protected............................CH<0..31>, CJSENSOR  
Transfer Characteristics  
Nonlinearity........................................0.005% FSR  
Offset error  
Gain = 1  
After calibration ....................300 µV max  
Before calibration..................600 µV  
Gain = 100  
After calibration ....................15 µV max  
Before calibration..................100 µV  
© National Instruments Corporation  
A-1  
VXI-SC-1102/B/C User Manual  
 
       
Appendix A  
Specifications  
Gain error  
Gain = 1  
After calibration.................... 0.015% of reading max  
Before calibration ................. 0.04% of reading  
Gain = 100  
After calibration.................... 0.02% 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  
1102  
110 dB  
1102B  
1102C  
90 dB  
75 dB min  
50 to 60 Hz, either gain  
0 Hz, gain 1  
90 dB  
75 dB min  
75 dB min  
0 Hz, gain 100  
100 dB min 100 dB min 100 dB min  
Output range ..........................................±10 V  
Output impedance .............................. 0.1 Ω  
Dynamic Characteristics  
Bandwidth (-3 dB) ............................. 2 Hz (1102)  
200 Hz (1102B)  
10 kHz (1102C)  
Scan interval (per channel, any gain)  
0.012% ........................................ 3 µs  
0.0061% ...................................... 10 µs  
VXI-SC-1102/B/C User Manual  
A-2  
© National Instruments Corporation  
 
Appendix A  
Specifications  
System noise (related to input)  
1102  
1102B  
1102C  
Gain = 1  
50 µVrms  
5 µVrms  
50 µVrms  
70 µVrms  
10 µVrms  
Gain = 100  
5 µVrms  
Filters  
Cutoff frequency (–3 dB)....................2 Hz (1102)  
200 Hz (1102B)  
10 kHz (1102C)  
NMR (60 Hz)......................................40 dB  
Step response (either gain)  
1102  
1102B  
10 ms  
100 ms  
1102C  
200 µs  
1 ms  
To 0.1%  
1 s  
10 s  
To 0.01%  
Stability  
Physical  
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  
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  
A-3  
VXI-SC-1102/B/C User Manual  
 
Appendix A  
Specifications  
Environment  
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  
VXI-SC-1102/B/C User Manual  
A-4  
© National Instruments Corporation  
 
Appendix  
B
Calibration Sample Program  
This chapter contains a sample program to help you calibrate your  
submodule.  
Sample Program for Calibration  
The following sample C program will help you calibrate the  
VXI-SC-1102/B/C submodules. The calibration constants are stored  
only in NI-DAQ memory. You must enter the (input, output) voltage  
pairs read by a DMM by hand. Before running the sample program  
below, you must run the NI-DAQ Configuration Utility to configure the  
VXI-SC chassis and to configure the DAQ device that will  
communicate with the VXI-SC-1102/B/C.  
The following sample program is written to work for a DAQ device,  
such as the VXI-MIO-64E-1, with a 5 V full-scale input:  
#include <stdio.h>  
#include <math.h>  
#include <dataacq.h>  
#define MIO_FULL_SCALE  
#define N_VXI_SC_SLOTS  
#define NIDAQMEM  
5.0  
24  
0
/*valid for VXI-MIO-64E-1 */  
#define ALL  
-1  
int  
enterInt (char *prompt)  
{
short  
ret;  
int  
value;  
© National Instruments Corporation  
B-1  
VXI-SC-1102/B/C User Manual  
 
         
Appendix B  
Calibration Sample Program  
do  
{
fputs(prompt, stdout);  
fflush(stdin);  
ret = scanf("%d", &value);  
} while (!ret);  
return (value);  
}
double  
enterFloat (char *prompt)  
{
short  
ret;  
double  
value;  
do  
{
fputs(prompt, stdout);  
fflush(stdin);  
ret = scanf("%lf", &value);  
} while (!ret);  
return (value);  
}
void  
main()  
{
int  
vxiChassisID,  
commPath,  
moduleSlot,  
moduleChan;  
/* slot of module to calibrate */  
short  
dummyRangeCode = 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. */  
VXI-SC-1102/B/C User Manual  
B-2  
© National Instruments Corporation  
 
Appendix B  
Calibration Sample Program  
double  
scale,  
gain,  
vInput1,  
vOutput1,  
vInput2,  
vOutput2,  
binOutput1,  
binOutput2,  
binOffset,  
gainerr,  
offset;  
do  
{
vxiChassisID = enterInt ("\nEnter chassis ID of the VXI-SC chassis:");  
} while (vxiChassisID < 1);  
do  
{
moduleSlot  
= enterInt ("Enter slot of the VXI-SC-1102: ");  
} while (moduleSlot < 1 || N_VXI_SC_SLOTS < moduleSlot);  
do  
{
commPath  
= enterInt ("Enter device number of the DAQ board"  
"controlling the chassis: ");  
} while (commPath < 0);  
dummyDAQboard  
dummyDAQrange  
scale  
= commPath;  
= MIO_FULL_SCALE / dummyDAQgain;  
= pow(2.0, 12.0) * dummyDAQgain / 10;  
/*factor for converting to format  
of 12-bit bipolar DAQ board */  
SCXI_Reset (vxiChassisID, moduleSlot);  
SCXI_Single_Chan_Setup (vxiChassisID, moduleSlot, 0, dummyDAQboard);  
/* This is necessary only so that  
SCXI_Change_Chan won't return  
an error. */  
for (gain = 1; gain <= 100; gain = gain + 99)  
{
SCXI_Set_Gain (vxiChassisID, moduleSlot, ALL, gain);  
/* Set the gain on all channels. */  
for (moduleChan = 0; moduleChan < 32; moduleChan++)  
© National Instruments Corporation  
B-3  
VXI-SC-1102/B/C User Manual  
 
Appendix B  
Calibration Sample Program  
{
SCXI_Change_Chan (vxiChassisID, moduleSlot, moduleChan);  
/* Select the channel. */  
printf("Apply input voltage for point 1, channel %d, gain %.0f.\n"  
moduleChan, gain);,  
vInput1  
= 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: ");  
/* User enters vInput2. */  
vOutput2 = 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);  
/* Calculate offset & gain error. */  
offset  
= binOffset/scale;  
/* Convert from DAQ board format. */  
printf("Calculated offset %f V, gain ratio (actual/ideal) %f"  
"and stored in NI-DAQ memory.\n\n", offset, gainerr);  
}
}
}
VXI-SC-1102/B/C User Manual  
B-4  
© National Instruments Corporation  
 
Appendix  
C
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.  
National Instruments has technical assistance through electronic, fax, and telephone systems to  
quickly provide the information you need. Our electronic services include a bulletin board service,  
an FTP site, a fax-on-demand system, and e-mail support. If you have a hardware or software  
problem, first try the electronic support systems. If the information available on these systems  
does not answer your questions, we offer fax and telephone support through our technical support  
centers, which are staffed by applications engineers.  
Electronic Services  
Bulletin Board Support  
National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files  
and documents to answer most common customer questions. From these sites, you can also download  
the latest instrument drivers, updates, and example programs. For recorded instructions on how to use  
the bulletin board and FTP services and for BBS automated information, call (512) 795-6990. You can  
access these services at:  
United States: (512) 794-5422  
Up to 14,400 baud, 8 data bits, 1 stop bit, no parity  
United Kingdom: 01635 551422  
Up to 9,600 baud, 8 data bits, 1 stop bit, no parity  
France: 01 48 65 15 59  
Up to 9,600 baud, 8 data bits, 1 stop bit, no parity  
FTP Support  
To access our FTP site, log on to our Internet host, ftp.natinst.com, as anonymousand use your  
Internet address, such as [email protected], as your password. The support files and  
documents are located in the /supportdirectories.  
© National Instruments Corporation  
C-1  
VXI-SC-1102/B/C User Manual  
 
       
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. Remember to include your name, address, and phone number so we can  
contact you with solutions and suggestions.  
Telephone and Fax Support  
National Instruments has branch offices all over the world. Use the list below to find the technical  
support number for your country. If there is no National Instruments office in your country, contact the  
source from which you purchased your software to obtain support.  
Telephone  
Fax  
Australia  
Austria  
Belgium  
Canada (Ontario)  
Canada (Quebec)  
Denmark  
Finland  
03 9879 5166  
03 9879 6277  
0662 45 79 90 0  
02 757 00 20  
905 785 0085  
514 694 8521  
45 76 26 00  
09 725 725 11  
01 48 14 24 24  
089 741 31 30  
2645 3186  
03 5734815  
02 413091  
03 5472 2970  
02 596 7456  
5 520 2635  
0662 45 79 90 19  
02 757 03 11  
905 785 0086  
514 694 4399  
45 76 26 02  
09 725 725 55  
01 48 14 24 14  
089 714 60 35  
2686 8505  
France  
Germany  
Hong Kong  
Israel  
Italy  
Japan  
03 5734816  
02 41309215  
03 5472 2977  
02 596 7455  
5 520 3282  
Korea  
Mexico  
Netherlands  
Norway  
Singapore  
Spain  
Sweden  
Switzerland  
Taiwan  
0348 433466  
32 84 84 00  
2265886  
91 640 0085  
08 730 49 70  
056 200 51 51  
02 377 1200  
01635 523545  
512 795 8248  
0348 430673  
32 84 86 00  
2265887  
91 640 0533  
08 730 43 70  
056 200 51 55  
02 737 4644  
01635 523154  
512 794 5678  
United Kingdom  
United States  
 
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.  
If you are using any National Instruments hardware or software products related to this problem,  
include the configuration forms from their user manuals. Include additional pages if necessary.  
Name __________________________________________________________________________  
Company _______________________________________________________________________  
Address ________________________________________________________________________  
_______________________________________________________________________________  
Fax ( ___ )___________________ Phone ( ___ ) _______________________________________  
Computer brand ________________ Model ________________ Processor___________________  
Operating system (include version number) ____________________________________________  
Clock speed ______MHz RAM _____MB  
Mouse ___yes ___no Other adapters installed _______________________________________  
Hard disk capacity _____MB Brand _____________________________________________  
Display adapter __________________________  
Instruments used _________________________________________________________________  
_______________________________________________________________________________  
National Instruments hardware product model __________ Revision ______________________  
Configuration ___________________________________________________________________  
National Instruments software product ____________________________Version ____________  
Configuration ___________________________________________________________________  
The problem is: __________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
List any error messages: ___________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
The following steps reproduce the problem:____________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
 
VXI-SC-1102/B/C Submodule 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. Completing this form accurately before  
contacting National Instruments for technical support helps our applications engineers answer your  
questions more efficiently.  
National Instruments Products  
Application Software and Version ____________________________________________________  
Other Products  
Computer make and model _________________________________________________________  
Microprocessor ___________________________________________________________________  
Clock frequency or speed ___________________________________________________________  
Type of video board installed ________________________________________________________  
Operating system version ___________________________________________________________  
Operating system mode ____________________________________________________________  
Programming language ____________________________________________________________  
Programming language version ______________________________________________________  
Other boards in system _____________________________________________________________  
Base I/O address of other boards _____________________________________________________  
DMA channels of other boards ______________________________________________________  
Interrupt level of other boards _______________________________________________________  
 
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/B/C User Manual  
Edition Date: August 1997  
Part Number: 321385B-01  
Please comment on the completeness, clarity, and organization of the manual.  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
If you find errors in the manual, please record the page numbers and describe the errors.  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
_______________________________________________________________________________  
Thank you for your help.  
Name _________________________________________________________________________  
Title __________________________________________________________________________  
Company _______________________________________________________________________  
Address ________________________________________________________________________  
_______________________________________________________________________________  
Phone ( ___ )__________________________ Fax ( ___ ) ________________________________  
Mail to: Technical Publications  
National Instruments Corporation  
Fax to: Technical Publications  
National Instruments Corporation  
(512) 794-5678  
6504 Bridge Point Parkway  
Austin, TX 78730-5039  
 
Glossary  
Prefix  
p-  
Meaning  
pico-  
Value  
10–12  
10–9  
10–6  
10–3  
103  
n-  
nano-  
micro-  
milli-  
kilo-  
µ-  
m-  
k-  
M-  
G-  
mega-  
giga-  
106  
109  
Numbers/Symbols  
+5 V  
°
+5 volt signal  
degrees  
ohms  
%
percent  
±
plus or minus  
A
AC  
alternating current  
analog-to-digital  
A/D  
ADC  
analog-to-digital converter–an electronic device, often an integrated  
circuit, that converts an analog voltage to a digital number  
© National Instruments Corporation  
G-1  
VXI-SC-1102/B/C User Manual  
 
   
Glossary  
amplification  
API  
a type of signal conditioning that improves accuracy in the resulting  
digitized signal and reduces noise  
application programming interface  
B
bus  
the group of conductors that interconnect individual circuitry in a  
computer. Typically, a bus is the expansion vehicle to which I/O or  
other devices are connected. Examples of PC buses are the AT bus,  
NuBus, Micro Channel, and EISA bus.  
C
C
Celsius  
CGND  
channel  
chassis ground signal  
pin or wire lead to which you apply or from which you read the analog  
or digital signal. Analog signals can be single-ended or differential. For  
digital signals, you group channels to form ports. Ports usually consist  
of either four or eight digital channels.  
CH<0..31> -  
CH<0..31>+  
CJC  
negative input channels 0 through 31  
positive input channels 0 through 31  
cold-junction compensation—a method of compensating for  
inaccuracies in thermocouple circuits  
CJSENSOR  
cold-junction sensor  
D
DAQ  
data acquisition—(1) collecting and measuring electrical signals from  
sensors, transducers, and test probes or fixtures and inputting them to a  
computer for processing; (2) collecting and measuring the same kinds  
of electrical signals with 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  
DC  
direct current  
VXI-SC-1102/B/C User Manual  
G-2  
© National Instruments Corporation  
 
Glossary  
DIFF  
differential configuration  
differential input  
an analog input consisting of two terminals, both of which are isolated  
from computer ground, whose difference is measured  
drivers/driver software software that controls a specific hardware device such as a DAQ board  
F
filtering  
a type of signal conditioning that allows you to filter unwanted signals  
from the signal you are trying to measure  
FSR  
full-scale range  
G
G
gain—the factor by which a signal is amplified, sometimes expressed in  
decibels  
H
hex  
Hz  
hexadecimal  
hertz  
I
in.  
inches  
input impedance  
the measured resistance and capacitance between the input terminals of  
a circuit  
instrument driver  
a set of high-level software functions that controls a specific VXI or  
RS-232 programmable instrument or a specific plug-in DAQ board.  
Instrument drivers are available in several forms, ranging from a  
function callable language to a virtual instrument (VI) in LabVIEW.  
© National Instruments Corporation  
G-3  
VXI-SC-1102/B/C User Manual  
 
Glossary  
L
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.  
LSB  
least significant bit  
M
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. It also  
provides cooling airflow, and ensures that modules do not disengage  
from the backplane due to vibration or shock.  
MB  
megabytes of memory  
multifunction I/O  
MIO  
MSB  
mux  
most significant bit  
multiplexer—a switching device with multiple inputs that sequentially  
connects each of its inputs to its output, typically at high speeds, in  
order to measure several signals with a single analog input channel  
N
NC  
not connected (signal)  
noise  
an undesirable electrical signal—Noise comes from external sources  
such as the AC power line, motors, generators, transformers,  
fluorescent lights, soldering irons, 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.  
VXI-SC-1102/B/C User Manual  
G-4  
© National Instruments Corporation  
 
Glossary  
R
RMA  
rms  
Return Material Authorization  
root mean square  
S
SCMP  
signal conditioning minipod  
signal conditioning  
slot  
the manipulation of signals to prepare them for digitizing  
A position where a module can be inserted into a VXIbus backplane.  
Each slot provides the 96-pin J connectors to interface with the board  
P connectors. A slot can have one, two, or three connectors.  
S/s  
samples per second  
T
thermocouple  
a temperature sensor created by joining two dissimilar metals. The  
junction produces a small voltage as a function of the temperature.  
transducer excitation  
a type of signal conditioning that uses external voltages and currents  
to excite the circuitry of a signal conditioning system into measuring  
physical phenomena  
V
V
volts  
VAC  
Vem  
VDC  
Vdiff  
volts alternating current  
common-mode voltage  
volts, direct current  
differential voltage  
© National Instruments Corporation  
G-5  
VXI-SC-1102/B/C User Manual  
 
Glossary  
VI  
virtual instrument—(1) a combination of hardware and/or software  
elements, typically used with a 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  
VIH  
volts, input high  
volts, input low  
volts in  
VIL  
Vin  
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.  
VOH  
volts, output high  
VOL  
volts, output low  
VXIbus  
VMEbus eXtensions for Instrumentation  
VXIplug&play  
Systems Alliance  
A group of VXI developers dedicated to making VXI devices as easy to  
use as possible, primarily by simplifying software development  
W
waveform  
a time-varying physical phenomenon, often measured in voltage  
VXI-SC-1102/B/C User Manual  
G-6  
© National Instruments Corporation  
 
Index  
channel input signal connections, 3-3 to 3-4  
common-mode input signal range,  
3-3 to 3-4  
Numbers  
+5 V signal (table), 3-3  
differential input signal range, 3-3  
exceeding input levels and ranges  
(warning), 3-4  
A
address handler, 4-2  
signal terminals, 3-3  
analog circuitry, 4-3 to 4-4  
analog input channels, 4-3  
analog output, 4-4  
analog input specifications, A-1 to A-4  
amplifier characteristics, A-2  
dynamic characteristics, A-2 to A-3  
input characteristics, A-1  
transfer characteristics, A-1 to A-2  
analog output, 4-4  
Channel Register, 4-2  
CJSENSOR signal  
cold-junction sensor connection, 3-6  
description (table), 3-3  
exceeding overvoltage protection  
(warning), 3-6  
cold-junction sensor connection, 3-6  
common-mode input signal range, 3-3 to 3-4  
ComponentWorks application software, 1-4  
Configuration Register, 4-2  
current-loop receivers, installing, 2-3  
customer communication, xii, C-1 to C-2  
B
bulletin board support, C-1  
D
C
differential input signal range, 3-3  
digital control circuitry, 4-2 to 4-3  
documentation  
calibration, 5-1 to 5-4  
equipment requirements, 5-1 to 5-2  
gain and offset calibration, 5-2 to 5-4  
overview, 5-1  
conventions used in manual, x to xi  
National Instruments documentation,  
xi to xii  
organization of manual, ix to x  
related documentation, xii  
sample program, B-1 to B-4  
CGND signal (table), 3-3  
CH31- through CH0- signals (table), 3-3  
CH31+ through CH0+ signals (table), 3-3  
© National Instruments Corporation  
I-1  
VXI-SC-1102/B/C User Manual  
 
   
Index  
parts locator diagram, 2-2  
unpacking the VXI-SC-1102/B/C, 1-7  
E
e-mail support, C-2  
EEPROM Register, 4-2  
electronic support services, customer  
communication  
environment specifications, A-4  
equipment, optional, 1-6  
L
LabVIEW application software, 1-4  
LabWindows/CVI application software, 1-4  
M
F
manual. See documentation.  
FaxBack support, C-2  
Module ID Register, 4-2  
filler panel, 1-2  
filter specifications, A-3  
floating signal connection  
referenced to chassis ground (figure), 3-6  
front connector pin assignments (figure), 3-2  
FTP support, C-1  
N
NI-DAQ driver software, 1-5  
P
parts locator diagram, 2-2  
physical specifications, A-3  
pins  
G
gain and offset calibration, 5-2 to 5-4  
Gain Register, 4-2  
front connector pin assignments  
(figure), 3-2  
front connector signal descriptions  
(table), 3-3  
ground-referencing signals, 3-4  
floating signal connection  
referenced to chassis ground  
(figure), 3-6  
power requirements, A-4  
ground-referenced signal connection  
(figure), 3-5  
R
requirements for getting started, 1-3  
resistors  
H
hardware installation. See installation.  
bent and trimmed resistor (figure), 2-3  
disconnecting signals before installing  
(warning), 2-3  
I
installing current-loop receivers, 2-3  
input damage level, exceeding (warning), 3-4  
installation, 2-1 to 2-4  
current-loop receivers, 2-3  
hardware installation, 2-4  
VXI-SC-1102/B/C User Manual  
I-2  
© National Instruments Corporation  
 
Index  
S
T
scan interval, minimum, 4-3  
settling time (note), 4-3  
technical support, customer communication  
telephone and fax support, C-2  
temperature sensor, 4-3  
signal connections, 3-1 to 3-6  
channel input signal connections,  
3-3 to 3-4  
theory of operation, 4-1 to 4-4  
analog circuitry, 4-3 to 4-4  
analog input channels, 4-3  
cold-junction sensor connection, 3-6  
front connector pin assignments  
(figure), 3-2  
ground-referencing signals, 3-4  
floating signal connection  
referenced to chassis ground  
(figure), 3-6  
analog output, 4-4  
block diagram of VXI-SC-1102, 4-1  
digital control circuitry, 4-2 to 4-3  
functional overview, 4-1 to 4-2  
VXIbus interface, 4-2  
ground-referenced signal connection  
(figure), 3-5  
U
signal descriptions (table), 3-3  
static electricity damage (caution), 3-1  
signal terminals for input channels, 3-3  
software programming choices, 1-4 to 1-6  
National Instruments application  
software, 1-4 to 1-6  
NI-DAQ driver software, 1-5  
VXIplug&play instrument driver, 1-6  
specifications, A-1 to A-4  
amplifier characteristics, A-2  
dynamic characteristics, A-2 to A-3  
environment, A-4  
unpacking the VXI-SC-1102, 1-7  
V
VirtualBench application software, 1-4  
VXI-SC-1000 carrier module, 1-2  
VXI-SC-1102/B/C. See also theory  
of operation.  
features, 1-2 to 1-3  
optional equipment, 1-6  
parts locator diagram, 2-2  
requirements for getting started, 1-3  
software programming choices, 1-4 to 1-6  
National Instruments application  
software, 1-4  
filters, A-3  
input characteristics, A-1  
physical, A-3  
power requirements, A-4  
stability, A-3  
transfer characteristics, A-1 to A-2  
stability specifications, A-3  
Status Register, 4-2  
NI-DAQ driver software, 1-5  
VXIplug&play instrument  
driver, 1-6  
unpacking, 1-7  
VXI signal conditioning system  
(figure), 1-1  
VXI signal conditioning system (figure), 1-1  
VXIbus interface, 4-2  
VXIplug&play instrument driver, 1-6  
© National Instruments Corporation  
I-3  
VXI-SC-1102/B/C User Manual  
 

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