DAQ SCXI-1102, SCXI-1102B, SCXI-1102C User Manual

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SCXI™-1102/B/C

User Manual

32-Channel Thermocouple Amplifier Modules

SCXI-1102/B/C User Manual

August 1997 Edition

Part Number 320975B-01

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National Instruments Corporate Headquarters

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Important Information

Warranty

The SCXI-1102, SCXI-1102B, and SCXI-1102C modules 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, f or a p eriod of 90 days f rom date of ship ment, 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 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

SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE

USTOMER’S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL

NSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER

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

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.

ATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND

, N

ATIONAL INSTRUMENTS

. N

. This limitation of the liability of National

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™, DAQCard™, DAQPad™, Measure™, SCXI™, and VirtualBench

Product and company names listed are trademarks or trade names of their respective companies.

™

are trademarks of National Instruments Corporation.

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

Customer Communication...............................................................................................xii

Chapter 1 Introduction

About the SCXI-1102/B/C Modules................................................................................1-1

What You Need to Get Started ........................................................................................1-2

Software Programming Choices......................................................................................1-3

National Instruments Application Software......................................................1-3

NI-DAQ Driver Software.................................................................................. 1-4

Optional Equipment...................................................................... .................................. .1-5

Custom Cables.................................................................................................................1-6

Unpacking........................................................................................................................1-6

Table

Contents

Chapter 2 Configuration and Installation

Module Configuration......................................................................................................2-1

Digital Configuration.........................................................................................2-3

Analog Configuration........................................................................................2-4

Current-Loop Receivers......................................................................2-4

Hardware Installation.......................................................................................................2-6

Chapter 3 Signal Connections

Front Connector.............................................................. .................................................3-1

Front Connector Signal Descriptions................................................................3-3

Analog Input Signal Connections.......................................................3-3

Ground-Referencing Your Signals.......................................3-4

Cold-Junction Sensor Connection.....................................................................3-6

National Instruments Corporation v SCXI-1102/B/C User Manual

Table of Contents

Rear Signal Connector..................................................................................................... 3-7

Rear Signal Connector Descriptions................................................................. 3-8

Chapter 4 Theory of Operation

Functional Overview.......................................................................................................4-1

Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface............. 4-2

Digital Control Circuitry...................................................................................4-2

Analog Circuitry ...............................................................................................4-3

Chapter 5 Calibration

Overview .........................................................................................................................5-1

Calibration Procedure......................................................................................................5-1

Calibration Equipment Requirements...............................................................5-1

Gain and Offset Calibration..............................................................................5-2

Analog Output Signal Connections....................................................3-9

Digital I/O Signal Connections...........................................................3-9

Digital Timing Signal Connection......................................................3-10

Digital Signal Specifications ..............................................................3-10

Analog Input Channels.......................................................................4-3

Analog Bus Switch.............................................................................4-4

Appendix A Specifications

Appendix B Calibration Sample Program

Appendix C Customer Communication

Glossary

Index

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National Instruments Corporation

Figures

Tables

Table of Contents

Figure 1-1. The Relationship between the Programming Environment,

NI-DAQ, and Your Hardware................................. ................................1-4

Figure 2-1. SCXI-1102/B/C Module Parts Locator Diagram (1102 shown).............2-2

Figure 2-2. Removing the SCXI Module Cover........................................................2-4

Figure 2-3. Bent and Trimmed Resistor.....................................................................2-5

Figure 3-1. SCXI-1102/B/C Module 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 3-4. SCXI-1102/B/C Module Rear Signal Connector Pin Assignments........3-7

Figure 4-1. SCXI-1102/B/C Module Block Diagram................................................4-1

Table 2-1. Jumper Settings for Digital Signal Connection.......................................2-3

Table 3-1. SCXIbus to SCXI-1102/B/C Module Rear Signal Connector

to DAQ Device Pin Equivalencies..........................................................3-10

National Instruments Corporation vii SCXI-1102/B/C User Manual

About

This

Manual

This manual describes the electrical and mechanical aspects of the SCXI-1102 family of modules and contains information concerning their installation and operation.

The SCXI-1102 family consists of the following modules:

• SCXI-1102

• SCXI-1102B

• SCXI-1102C Unless otherwise noted, SCXI-1102/B/C will hereafter refer to all three

modules in the SCXI-1102 family. The SCXI-1102/B/C modules are members of the National Instruments

Signal Conditioning eXtensions for Instrumentation (SCXI) Series for the National Instruments data acquisition (DAQ) plug-in devices. Th ese modules are designed for signal conditioning thermocouples, volt and millivolt sources, and 4–20 mA sources or 0–20 mA process-current sources. The SCXI-1102/B/C modules have 32 differential analog input channels and one cold-junction sensor channel.

Organization of This Manual

The SCXI-1102/B/C User Manual is organized as follows:

• Chapter 1, Introduction, describes the SCXI-1102/B/C modules; lists what you need to get started with your SCXI-1102/B/C module, the optional software, optional equipment, and custom cables; and explains how to unpack the SCXI-1102/B/C modules.

• Chapter 2, Configuration and Installation, describes how to configure the SCXI-1102/B/C jumper, how to install current-loop receivers, and how to install the SCXI-1102/B/C module into the SCXI chassis.

• Chapter 3, Signal Connections, describes the input and output signal connections to the SCXI-1102/B/C module via the module front connector and rear signal connector. This chapter also

National Instruments Corporation ix SCXI-1102/B/C User Manual

About This Manual

includes specifications and connection instructions for the signals on the SCXI-1102/B/C connectors.

• Chapter 4, Theory of Operatio n , contains a functional overview of the SCXI-1102/B/C module and explains the operation of each functional unit making up the SCXI-1102/B/C module.

• Chapter 5, Calibration, discusses the calibration procedures for the SCXI-1102/B/C modules.

• Appendix A, Specifications, lists the specifications for the SCXI-1102/B/C modules.

• 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 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.

♦ The ♦ symbol indicates that the text following it applies only to specific

SCXI-1102 modules.

< > 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).

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

Lab board Refers to the boards that have Lab in their names, such as the Lab-LC

SCXI-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.

key concept.

and the Lab-PC+.

National Instruments Corporation

About This Manual

MIO board Refers to the multichannel I/O DAQ boards that have MIO in their

names, such as the AT-MIO-16 and the NEC-MIO-16E-4.

monospace Denotes text or characters that are to be literally input from the

keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, variables, filenames, and extensions, and for statements and

comments taken from program code. PC Refers to the IBM PC/XT, the IBM PC AT, and compatible computers. SCXIbus Refers to the backplane in the chassis. A signal on the backplane is

referred to as the SCXIbus <signal name> line (or signal). The SCXIbus

descriptor may be omitted when the meaning is clear. Descriptions of

all SCXIbus signals are in Chapter 3, Signal Connections. SCXI-1102/B/C Refers to all modules in the SCXI-1102 family unless otherwise noted.

modules Slot 0 Refers to the power supply and control circuitry in the SCXI chassis.

Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and

terms are listed in the Glossary.

National Instruments Documentation

The SCXI™-1102/B/C User Manual is one piece of the documentation

set for your data acquisition system. You could have any of several

types of manuals, depending on the hardware and s oftware in you r

system. Use the manuals you have as follows:

• Getting Started with SCXI—This is the first manual you should read. It gives an overview of the SCXI system and contains the most commonly needed information for the modules, chassis, and software.

• Your SCXI hardware user manuals—Read these manuals next for detailed information about signal connections and module configuration. They also explain in greater detail how the module works and contain application hints.

• Your DAQ hardware user manuals—These manuals have detailed information about the DAQ hardware that plugs into or is connected to your computer. Use these manuals for hardware installation and configuration instructions, specification information about your DAQ hardware, and application hints.

National Instruments Corporation xi SCXI-1102/B/C User Manual

About This Manual

• Software documentation—Examples of software documentation you may have are the LabVIEW and LabWindows sets and the NI-DAQ documentation. After you set up your hardware system, use either the application software documentation or the NI-DAQ documentation to help you write your application. If you have a large and complicated system, it is worthwhile to look through the so ftware documentation b efore you configure your hardware.

• Accessory installation guides or manuals—If you are using accessory products, read the terminal block and cable assembly installation guides. They explain how to physically connect the relevant pieces of the system. Consult these guides when you are making your connections.

• SCXI Chassis Manual—Read this manual for maintenance information on the chassis and installation instructions.

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.

/CVI manual

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National Instruments Corporation

Chapter

Introduction

This chapter describes the SCXI-1102/B/C modules; lists what you need to get started with your SCXI-1102/B/C module, the optional software, optional equipment, and custom cables; and explains how to unpack the SCXI-1102/B/C modules.

About the SCXI-1102/B/C Modules

♦ SCXI-1102

This module is for signal conditioning of thermocouples, low-bandwidth volt and millivolt sources, 4 to 20 mA current sources, and 0 to 20 mA process-current sources. The SCXI-1102 has 32 differential analog input channels and one cold-junction sensor channel. On each channel, the SCXI-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 SCXI-1102 inputs to a single output, which drives a single DAQ device channel.

♦ SCXI-1102B

This module is for the signal conditioning of thermocouples, medium-bandwidth volt and millivolt sources, 4 to 20 mA current sources, and 0 to 20 mA process-current sources. The SCXI-1102B has 32 different analog input channels and one cold-junction sensor channel. On each channel, the SCXI-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 SCXI-1102B inputs to a single output, which drives a single DAQ device channel.

♦ SCXI-1102C

This module is for the signal conditioning of thermocouples, high-bandwidth volt and millivolt sources, 4 to 20 mA current sources, and 0 to 20 mA process-current sources. The SCXI-1102C has 32 different analog input channels and one cold-junction sensor channel. On each channel, the SCXI-1102C has a three-pole lowpass filter with a 10 kHz cutoff frequency. Each channel also has an amplifier with a

National Instruments Corporation 1-1 SCXI-1102/B/C User Manual

Chapter 1 Introduction

selectable gain of 1 or 100. You can multiplex the SCXI-1102C inputs to a single output, which drives a single DAQ device channel.

The SCXI-1102/B/C modules operate with full functionality with the National Instruments MIO, Lab-PC+, PCI-1200, DAQCard-1200, and SCXI-1200 modules. You can use the PC-LPM-16 board and the DAQCard-700 with the SCXI-1102/B/C, but these devices cannot scan the module; they can only perform single-channel reads. You can multiplex several SCXI-1102/B/C modules and other SCXI modules into a single channel on the DAQ device, greatly increasing the number of analog input signals that you can digitize.

Detailed specifications of the SC XI-1102/B/ C modul es are listed in Appendix A, Specifications.

What You Need to Get Started

To set up and use your SCXI-1102/B/C module, you will need the following items:

❑ One of the following modules:

SCXI-1102 SCXI-1102B SCXI-1102C

❑ SCXI-1102/B/C User Manual ❑ One of the following software packages and documentation:

ComponentWorks LabVIEW for Macintosh LabVIEW for Windows LabWindows/CVI for Windows Measure NI-DAQ for Macintosh NI-DAQ for PC Compatibles VirtualBench

❑ Your computer

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National Instruments Corporation

Software Programming Choices

You have several options to choose from when programming your National Instruments DAQ and SCXI hardware. You can use National Instruments application software, NI-DAQ, or register-level programming.

National Instruments Application 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 ComponentWork s, you can use all of the configuration tools, resource management utilities, and interactive control utilities included with NI-DAQ.

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 NI-DAQ software.

Chapter 1 Introduction

LabWindows/CVI features interactive graphics, 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.

VirtualBench features virtual instruments 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 ComponentWorks, LabVIEW, LabWindows/CVI, or VirtualBench software will greatly reduce the development time for your data acquisition and control application.

National Instruments Corporation 1-3 SCXI-1102/B/C User Manual

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 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 also internally addresses many of the complex issues between the computer and the plug-in device, such as programming interrupts and DMA controllers. NI-DAQ maintains a consistent software interface among its different versions so that you can change platforms with minimal modifications to your code. Figure 1-1 illustrates the relationship between NI-DAQ and your National Instruments application software.

Conventional

Programming Environment

DAQ or

SCXI Hardware

Figure 1-1.

The Relationship between the Programming Environment,

NI-DAQ, and Your Hardware

ComponentWorks,

LabVIEW,

LabWindows/CVI, or

VirtualBench

NI-DAQ

Driver Software

Personal

Computer or

Workstation

SCXI-1102/B/C User Manual 1-4

National Instruments Corporation

The final option for programming any National Instruments DAQ hardware is to write register-level software. Writing register-level programming software can be very time-consuming and inefficient and is not recommended.

Even if you are an experienced register-level programmer, consider using NI-DAQ or other National Instruments application software to program your National Instruments DAQ hardware. Using the application software is easier than and as flexible as register-level programming and can save weeks of development time.

Optional Equipment

National Instruments offers a variety of products to use with your SCXI-1102/B/C module, as follows:

• Terminal blocks and 96-pin cables that allow you to attach input signals to your module.

• SCXI process-current resistor kit

• Cables and cable assemblies, shielded and ribbon

Chapter 1 Introduction

For more specific information about these products, refer to your National Instruments catalogue or call the office nearest you.

National Instruments Corporation 1-5 SCXI-1102/B/C User Manual

Chapter 1 Introduction

Custom Cables

The following table summarizes the custom cable information.

Signal

Connector

Rear AMP Inc. (1-103310-0)

Front Harting Electronik Inc.

SCXI–1102/B/C

Connector

50-pin male ribbon cable header

(09-03-396-6921) 96-pin DIN C male connector

Unpacking

Your SCXI-1102/B/C module is shipped in an antistatic package to prevent electrostatic damage to the module. Electrostatic discharge can damage several components on the module. To avoid such damage in handling the module, 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 SCXI chassis before removing the module from the package.

• Remove the module from the package and inspect the module for loose components or any other sign of damage. Notify National Instruments if the module appears damaged in any w ay. Do not install a damaged module into your SCXI chassis.

• Never touch the exposed pins of connectors.

Mating

Connector

Electronic Products Division/3M (3425-7650) or T&B/Ansley Corp. (609-5041CE) 50-position polarized ribbon-socket connector

AMP Inc. (535020; right-angle pins) or Panduit Corp. (100-096-434 straight-solder pins) 96-pin, polarized, DIN C female connector

Cable

Electronic Products Division/3M (3365/50) or T&B/Ansley Corp. (171-50) 50-conductor, 28 AWG stranded ribbon cable

N/A

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National Instruments Corporation

Configuration and

Chapter

Installation

This chapter describes how to configure your SCXI-1102/B/C jumper, how to install current-loop receivers, and how to install your SCXI-1102/B/C module into the SCXI chassis.

Module Configuration

The SCXI-1102/B/C contains one jumper, shown in Figure 2-1. Jumper W1 connects a pullup resistor to the SERDATOUT signal on the rear signal connector.

The remainder of the module configuration (gain, output signal referencing, and so on) is software-programmable.

National Instruments Corporation 2-1 SCXI-1102/B/C User Manual

Chapter 2 Configuration and Installation

1 RCL24-RCL31 2 RCL14-RCL23

3 RCL8-RCL13 4 Assembly Number

Figure 2-1. SCXI-1102/B/C Module Parts Locator Diagram (1102 shown)

SCXI-1102/B/C User Manual 2-2

5 RCL0-RCL7 6 Serial Number

7W1

National Instruments Corporation

Digital Configuration

PULLUP NO PULLUP

If you have a one-chassis system, you do not have to read this section. You can skip to the next section, Analog Configuration.

Note: If nothing is cabled to the SCXI-1102/B/C module rear signal connector,

the position of jumper W1 is irrelevant.

The SCXI-1102/B/C modules have only one jumper—jumper W1—f or communication between the DAQ device and the SCXIbus, shown in Table 2-1.

Chapter 2 Configuration and Installation

Table 2-1.

Jumper Settings for Digital Signal Connection

Jumper Description Configuration

Position PULLUP—Use this setting for a single-chassis system and for one cabled module in a multi-chassis system. Connects a

2.2 kΩ pullup resistor to the SERDATOUT line. (factory setting)

Position NO PULLUP—Use this

setting for additional chassis in a multi-chassis system. No pullup resistor is connected to the SERDATOUT line.

All SCXI modules have a jumper that corresponds to jumper W1 on the SCXI-1102/B/C module. Refer to the user manuals of the other SCXI modules in your system to determine the designator and settings of this jumper. In the pullup position, this jumper connects a pullup resistor to the SERDATOUT line. This pullup resistor pulls the SERDATOUT line high when its open-collector driver goes to a high-impedance state. The SERDATOUT line on the SCXI-1102/B/C module reads the Module ID Register, the Status Register, and the EEPROM.

When using a single-chassis system, set the jumper in the pullup position on the SCXI module cabled to the DAQ device. When using multiple chassis, set the jumper to the pullup position on only one of the SCXI modules cabled to the DAQ device.

National Instruments Corporation 2-3 SCXI-1102/B/C User Manual

Chapter 2 Configuration and Installation

If you want to change the W1 jumper setting, refer to Figure 2-2 as you perform the following steps:

1. Ground yourself via a grounding strap or via a ground connected to your SCXI chassis. Properly grounding yourself prevents damage to your SCXI module from electrostatic discharge.

2. Remove the grounding screw of the top cover.

3. Snap out the top cover of the shield by placing a screwd river in the groove at the bottom of the module and pushing down on the screwdriver.

4. Change the W1 jumper setting.

5. Reinstall the top cover and grounding screw.

Removable Cover

Grounding

Screw

Figure 2-2. Removing the SCXI Module Cover

Analog Configuration

Current-Loop Receivers

The SCXI-1102/B/C modules have pads for transforming individual channels to current-to-voltage converters. National Instruments offers an SCXI process-current pack of four 249 Ω, 0.1%, 5 ppm, 1/4 W resistors. The reference designators for the current loop resistors have

SCXI-1102/B/C User Manual 2-4

Front Connector

Top of Module

National Instruments Corporation

Chapter 2 Configuration and Installation

the 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 module, make sure that there are no

signals connected to your module front connector.

Before installing your module in the SCXI chassis, you must install the resistors by performing the following steps:

1. Ground yourself via a grounding strap or via a ground connected to your SCXI chassis. Properly grounding yourself prevents damage to your SCXI module from electrostatic discharge.

2. Remove the grounding screw of the top cover.

3. Snap out the top cover of the shield by placing a screwd river in the groove at the bottom of the module and pushing down.

4. Remove the rear panel by unscrewing the two remaining screws.

5. Slide the module out of its enclosure.

6. Bend and trim the resistor lead as shown in Figure 2-3. Be sure that the resistor does not extend more than 0.65 in. above the surface of the circuit board.

Figure 2-3. Bent and Trimmed Resistor

7. Insert the resistor into the appropriate pa d, labeled RCLx.

8. Solder the leads to the pad on the bottom side of the module.

9. Slide the module back into its enclosure.

10. Reinstall the rear panel.

11. Reinstall the top cover and grounding screw.

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Chapter 2 Configuration and Installation

Hardware Installation

You can install the SCXI-1102/B/C module in any available SCXI chassis slot. After you have made any necessary changes and have verified and recorded the jumper setting on the form in Appendix C, Customer Communication, you are ready to install the SCXI-1102/B/C module. The following are general installation instructions; consult the user manual or technical reference manual of your SCXI chassis for specific instructions and warnings:

1. Turn off the computer that contains the DAQ device or disconnect it from your SCXI chassis.

2. Turn off the SCXI chassis. Do not insert the SCXI-1102/B/C module into a chassis that is turned on.

3. Insert the SCXI-1102/B/C module into the module guides. Gently guide the module into the back of the slot until the connectors make good contact. If a cable assembly has already been installed in the rear of the chassis, the module and cable assembly must be firmly engaged; however, do not force the module into place.

4. Screw the front mounting panel of the SCXI-1102/B/C module to the top and bottom threaded strips of your SCXI chassis.

5. If this module is to be connected to an MIO-16 DAQ device, attach the connector at the metal end of the SCXI-1340 cable assembly to the rear signal connector on the SCXI-1102/B/C module. Screw the rear panel to the rear threaded strip. Attach the loose end of the cable to the MIO-16 device.

Note: For installation procedures with other SCXI accessories and DAQ devices,

consult your cable installation guide.

6. Check the installation.

7. Turn on the SCXI chassis.

8. Turn on the computer or reconnect it to your chassis.

The SCXI-1102/B/C module is installed. You are now ready to install and configure your software.

If you are using NI-DAQ or other National Instruments application software, refer to the installation instructions in your documentation to install and configure your software.

SCXI-1102/B/C User Manual 2-6

National Instruments Corporation

Chapter

Signal Connections

This chapter describes the input and output signal connections to the SCXI-1102/B/C module via the module front connector an d rear signal connector. This chapter also includes specifications and connection instructions for the signals on the SCXI-1102/B/C module connectors.

Caution:

Front Connector

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.

Figure 3-1 shows the pin assignments for the SCXI-1102/B/C module front connector.

National Instruments Corporation 3-1 SCXI-1102/B/C User Manual

Chapter 3 Signal Connections

CGND

NC NC NC NC NC NC NC

CGND

NC NC

NC NC NC

CGND

NC NC NC NC NC NC NC NC NC NC

CGND CJSENSOR CJSENSOR

CGND

+5 V

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

CH0CH1CH2CH3CH4CH5CH6CH7CH8-

CH9CH10CH11CH12CH13CH14-

CH15-

CH16CH17CH18CH19CH20CH21CH22-

9 8 7 6 5 4 3 2 1

CH23CH24CH25CH26CH27CH28CH29CH30CH31-

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

CH0+ CH1+ CH2+ CH3+ CH4+ CH5+ CH6+ CH7+ CH8+ CH9+

CH10+

CH11+

CH12+ CH13+ CH14+

CH15+

CH16+ CH17+ CH18+ CH19+ CH20+ CH21+ CH22+ CH23+ CH24+ CH25+ CH26+ CH27+ CH28+ CH29+ CH30+ CH31+

96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

Figure 3-1. SCXI-1102/B/C Module Front Connector Pin Assignments

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National Instruments Corporation

Front Connector Signal Descriptions

Pin Signal Name Description

A1 +5 V +5 VDC Source—Used to

Chapter 3 Signal Connections

power the temperature sensor on the terminal block. 0.2 mA of source not protected.

A2, A5, A16, A24, A32

A3, A4 CJSENSOR Cold-junction Temperature

B1–B32 CH31- through CH0– Negative Input Channels —

C1–C32 CH31+ through CH0+ Positive Input Channels 31

All other pins are not connected.

CGND Chassis Ground—Tied to the

SCXI chassis.

Sensor Input—Connects to the temperature sensor of the terminal block.

Negative side of differential input channels.

through 0—Positive side of differential input channels.

Analog Input Signal Connections

The signal terminals for the positive input channel are located in column B of the connector. The signal terminal for each corresponding negative input channel is located in column C 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 an SCXI-1102/B/C module input channel is ±10 V/G, where G is the gain selected on the SCXI-1102/B/C module 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 an SCXI-1102/B/C module input channel is ±11 V. This common-mode

National Instruments Corporation 3-3 SCXI-1102/B/C User Manual

Chapter 3 Signal Connections

Caution: Exceeding the input damage level (±42 VAC peak or VDC between input

channels and chassis ground) can damage the SCXI-1102/B/C module, the SCXIbus, and the DAQ device. National Instruments is injuries resulting from such signal connections.

Applying a voltage greater than ±42 VAC peak or VDC to the SCXI-1102/B/C is an electrical shock hazard. National Instruments is liable for any damages or injuries resulting from such voltage application.

Note: Exceeding the differential or common-mode input channel ranges results

in a distorted signal measurement.

input range for either positive or negative channel input is the maximum input voltage which 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.

liable for any

NOT

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 the SCXI-1303 terminal block. The SCXI-1303 also has a resistor pack for pulling up the positive input s for open-thermocouple detection. Consult the SCXI-1303 32-Channel Isothermal Block Installation Guide for details.

Do not ground signals which are already ground-referenced; doing so will result in a ground loop, which adversely affects your measurement accuracy.

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National Instruments Corporation

Chapter 3 Signal Connections

CH0+ CH0-

CH1+

CH1-

Connector

Front Signal

SCXI - 1102/B/C

Figure 3-2. Ground-Referenced Signal Connection

National Instruments Corporation 3-5 SCXI-1102/B/C User Manual

Chapter 3 Signal Connections

CH0+ CH0-

Floating

Signal

Make This Connection

to Ground Reference

the Signal

Referenced to

Chassis Ground

CH1+ CH1-

Connector

Front Signal

CGND

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 SCXI-1300 or SCXI-1303 terminal blocks to the SCXI- 1102/B/C module. The CJSENSOR signal is measured relative to CGND. Pins A3 and A4 are connected within the SCXI-1102/B/C module so the position of the MTEMP/DTEMP jumper on the SCXI-1300 or SCXI-1303 does not matter. The input is overvoltage-protected to 15 VDC with power on and off.

SCXI - 1102/B/C

Caution: Exceeding the overvoltage protection on the CJSENSOR input can damage

the SCXI-1102/B/C module, the SCXIbus, and the DAQ device. National Instruments is

liable for any damages or injuries resulting from such

NOT

signal connections.

SCXI-1102/B/C User Manual 3-6

National Instruments Corporation

Rear Signal Connector

Note: If you are using the SCXI-1102/B/C module with a National Instruments

DAQ device and cable assembly, you do not need to read the remainder of this chapter. If you are using the SCXI-1180 feedthrough panel, the SCXI-1343 rear screw terminal adapter, or the SCXI-1351 one-slot cable extender with the SCXI-1102/B/C module, read this section.

Figure 3-4 shows the SCXI-1102/B/C module rear signal connector pin assignments.

Chapter 3 Signal Connections

AOGND

MCH0+

NC NC

NC NC NC NC

OUTREF

NC NC

SERDATIN

DAQD*/A

SLOT0SEL*

DGND

NC NC

SERCLK

NC NC

RSVD

NC NC NC

12 34 56 78

910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

AOGND MCH0NC NC NC NC NC NC

NC NC

NC DGND SERDATOUT NC NC NC NC SCANCLK NC NC NC NC RSVD NC NC

Figure 3-4.

National Instruments Corporation 3-7 SCXI-1102/B/C User Manual

SCXI-1102/B/C Module Rear Signal Connector Pin Assignments

Chapter 3 Signal Connections

Rear Signal Connector Descriptions

The rear signal connector on the cabled module is the interface between the DAQ device and all modules in the SCXI chassis.

Pin Signal Name Direction Description

1, 2 AOGND Output Negative Module Analog Output—With software, you

can configure these pins to connect to the analog reference.

3 MCH0+ Output Positive Module Analog Output—This pin connects to

the positive side of the differential analog input channel 0 of the DAQ device.

4 MCH0- Output Negative Module Analog Output—In the reset state of

the module, this pin is configured to connect to the analog reference.

19 OUTREF Output Negative Module Analog Output—With software, you

can configure this pin to connect to the analog reference.

24, 33 DGND — Digital Ground—These pins supply the reference for

DAQ device digital signals and are tied to the module digital ground.

25 SERDATIN Input Serial Data In—The DAQ device uses this signal to

program modules in all slots.

26 SERDATOUT Output Serial Data Out—A cabled module uses this signal to

return data from any module to the DAQ device.

27 DAQD*/A Input DAQ Device Data/Address Line—The DAQ device

asserts this signal to indicate to the module whether the incoming serial stream is data or address information.

29 SLOT0SEL* Input Slot 0 Select—The DAQ device asserts this signal low

to indicate that the SERDATIN line information is going to the Slot 0 controller instead of a module.

SCANCLK Input Scan Clock—A rising edge indicates to the scanned

SCXI module that the DAQ device has taken a sample and causes the module to advance channels.

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National Instruments Corporation

Chapter 3 Signal Connections

Pin Signal Name Direction Description

43, 46

All other pins are not connected.

SERCLK Input Serial Clock—This signal clocks the data on the SER-

DATIN and SERDATOUT lines.

RSVD Input Reserved

The signals on the rear signal connector are analog output signals, digital I/O signals, or digital timing signals. The following section contains signal connection guidelines for each of these groups.

Analog Output Signal Connections

Pins 1 through 4 and pin 19 of the rear signal connector are analog output signal pins. Pins 1 and 2 are AOGND signal pins, pin 4 is the MCH0- pin, and pin 19 is the OUTREF pin. With software, you can configure pin 1, 2, 4 or 19 to connect to the module’s analog ground (AGND). You can use the pin that is connected to AGND as a general analog power ground tie point to the SCXI-1102/B/C module, if necessary.

Caution: The SCXI-1102/B/C module analog outputs are not overvolta ge-protected.

Applying external voltages to these outputs can damage the SCXI-1102/B/C module. National Instruments is damages resulting from such signal connections.

liable for any

NOT

Note: The SCXI-1102/B/C module analog outputs are short-circuit protected.

Digital I/O Signal Connections

Pins 24 through 27, 29, 33, 36, 37, 43, and 46 constitute the digital I/O lines of the rear signal connector.

The SCXI-1102/B/C module digital input and output signals match the digital I/O lines of the MIO-16 boards. When used with an SCXI-1341, SCXI-1342, or SCXI-1344 cable assembly, the SCXI-1102/B/C module signals match the digital lines of the Lab-NB/PC+, the PC-LPM-16, and

National Instruments Corporation 3-9 SCXI-1102/B/C User Manual

Chapter 3 Signal Connections

the Lab-LC boards, respectively. Table 3-1 l ists th e equi vale nc ies . For more detailed information, consult your cable installation guide.

Table 3-1.

SCXIbus

Line

SCXIbus to SCXI-1102/B/C Module Rear Signal Connector to DAQ Device Pin Equivalencies

SCXI-1102/B/C

MIO-16 Lab Boards PC-LPM-16

Rear Signal

Connector

MOSI SERDATIN ADIO0 PB4 DOUT4 D*/A DAQD*/A ADIO1 PB5 DOUT5 INTR* SLOT0SEL* ADIO2 PB6 DO UT6 SPICLK SERCLK EXTSTROBE* PB7 DOUT7 MISO SERDATOUT BDIO0 PC1 DIN6

Digital Timing Signal Connection

The SCXI-1102/B/C module uses pin 36, SCANCLK, to increment to the next channel after each DAQ device conversion during scanning.

Digital Signal Specifications

The following specifications and ratings apply to the digital signals:

• Absolute max voltage input rating 5.5 V with respect to DGND

• Digital input specifications (referenced to DGND)

–V –V –I

• Digital output specifications (referenced to DGND)

–V –V

input logic high voltage 2 V min

input logic low voltage 0.8 V max

input current leakage ±1 µA max

output logic high voltage 3.7 V min at 4 mA max

output logic low voltage 0.4 V max at 4 mA max

SCXI-1102/B/C User Manual 3-10

National Instruments Corporation

Chapter

Theory of Operation

This chapter contains a functional overview of the SCXI-1102/B/C module and explains the operation of each fun ctional unit making up the SCXI-1102/B/C module.

Functional Overview

The block diagram in Figure 4-1 illustrates the key functional components of the SCXI-1102/B/C module.

CH 0 +

CH 0 –

Inst.

Amp

–

Input Protection

and Lowpass Filter

Gain 0

Lowpass

Filter

Buffer

32-to-1 Mux

Mux

Buffer

Switch

Mux

MCH0+ MCH0-

AOGND

OUTREF

Rear Signal Connector

CH 31+

CH 31 –

Front Signal Connector

CJSENSOR

National Instruments Corporation 4-1 SCXI-1102/B/C User Manual

Inst.

Amp

–

Input Protection

and Lowpass Filter

Input Protection

and Lowpass Filter

Lowpass

Gain 31

Lowpass

Filter

Buffer

Figure 4-1.

SCXIbus Interface

Gain

Calibration EEPROM

Digital

Control

SCXI-1102/B/C Module Block Diagram

AB0+

AB0-

SCXIbus Connector

Chapter 4 Theory of Operation

The major components of the SCXI-1102/B/C modules are as follows:

• Rear signal connector

• SCXIbus connector

• SCXIbus interface

• Digital control circuitry

• Analog circuitry

The SCXI-1102/B/C modules 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 SCXI-1102/B/C modules also have a digital section for automatic control of channel scan ning, temperature sensor selection, and gain selection.

Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface

The SCXIbus controls the SCXI-1102/B/C module. The SCXIbus interface connects the rear signal connector to the SCXIbus, allowing a DAQ device to control the SCXI-1102/B/C module and the rest of the chassis.

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 SCXI-1102 module:

♦ SCXI-1102—The Module ID is 30 decimal. ♦ SCXI-1102B—The Module ID is 31 decimal. ♦ SCXI-1102C—The Module ID is 62 decimal.

The Configuration Register configures t he SCXI-1102/B/C modules for the desired scanning mode and connection to the rear signal connector. The Status Register indicates whether the input channels have settled after a change in the gains. The EEPROM Register is the address for interfacing with the module 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

SCXI-1102/B/C User Manual 4-2

National Instruments Corporation

Analog Circuitry

Note: Because of the 2 Hz bandwidth of the SCXI-1102 module input channels,

Chapter 4 Theory of Operation

Software Programming Choices in Chapter 1, Introduction, to learn about options for programming the control 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 feeds to a separate amplifier with a programmable gain of 1 or 100. Then the signal passes through a three-pole lowpass filter.

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. For the SCXI-1102B and SCXI-1102C modules, this time is approximately 100 ms and 1 ms, respectively.

The temperature sensor consists of a thermistor located on the SCXI-1300 or SCXI-1303 terminal block. The temperature sensor is for cold-junction compensation of the SCXI-1102/B/C thermocouples. The CJSENSOR channel also passes through a 2 Hz lowpass filter to reject unwanted noise on the SCXI-1102/B/C. Along with the other 32 input channels, the CJSENSOR is multiplexed to the output buffer, where it can be read by the DAQ device.

For 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 module and still measure accurate voltages. The 3 µs scan interval gives you a maximum sampling rate of 333 kHz. Because this rate is higher than the bandwidth of a single SCXI-1102/B/C channel, you can sample multiple channels on mu ltiple SCXI modules without undersampling one of the SCXI-1102/B/C channels.

National Instruments Corporation 4-3 SCXI-1102/B/C User Manual

Chapter 4 Theory of Operation

Analog Bus Switch

The SCXI-1102/B/C modules contain switches to place their analog output on the SCXIbus to pass the output to the SCXI module cabled to the DAQ device. The SCXI-1102/B/C modules also contain switches to receive a signal placed on the SCXIbus by another SCXI module. The output buffer of the cabled module drives a received signal onto the MCH0+ line of the rear signal connector so that the DAQ device can read it. When a signal passes on the SCXIbus from the scanned SCXI module to the cabled SCXI module, the measurement is known as

indirect scanning.

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National Instruments Corporation

Chapter

Calibration

Overview

This chapter discusses the calibration procedures for the SCXI-1102/B/C modules.

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 us ing National Instruments software. The module comes from the factory with factory-determined calibration constants in the EEPROM. However, it is recommended that you recalibrate a module at least once per year or when you operate the module outside of the 20° to 30° C temperature range.

In order to calibrate the SCXI-1102/B/C modules, you will need to apply precision voltages to the channel inputs and/or ground the channel inputs.

Calibration Procedure

Calibration Equipment Requirements

According to standard practice, the equipment you use to calibrate the SCXI-1102/B/C module should be 10 times as accurate as the SCXI-1102/B/C module. Calibration equipment with four times the accuracy of the SCXI-1102/B/C is generally considered acceptable.

National Instruments Corporation 5-1 SCXI-1102/B/C User Manual

Chapter 5 Calibration

To calibrate the SCXI-1102/B/C module, you need a voltmeter with the following specifications:

• Accuracy ±6 ppm standard reading

±15 ppm sufficient reading

• Range –10 to +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 introdu ce an additional offset, you can determine the offset error of the DMM by shorting its leads together and reading the measured value. This value, the DMM offset, must be subtracted from all subsequent measurements.

You will need to measure the module’s output between MCH0+ and MCH0–. To access these pins, connect a 50-pin ribbon cable from the CB-50 I/O connector block to the module rear signal connector or to the rear signal adapter. Then connect to MCH0+ and MCH0– on the CB-50 pins 3 and 4, respectively.

Gain and Offset Calibration

To determine the offset and gain calibration factors of the SCXI-1102/B/C module 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, if you are planning to measure bipolar voltages over the module’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.

Note: To make one of your calibration points the zero poi nt, 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

SCXI-1102/B/C User Manual 5-2

input1.

National Instruments Corporation

Chapter 5 Calibration

Note: If you are using a calibrator that supplies accurate voltages, you can simply

use the known applied voltage for

input1 instead of measuring.

c. Measure the module output between MCH0+ and MCH0–

with the DMM. Call the measured voltage

output1

3. Repeat step 2, applying the input for the second calibration point. Call the measured voltages

input2 and 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 (

(

input2, output2

). Each pair consists of an input voltage and an

input1, output1

) and

output voltage.

5. Convert the output voltages from volt units to your DAQ device binary unit. You must take into consideration the polarity of your DAQ device, its resolution (12 bits or 16 bits), and gain. For example, if you are using the 12-bit AT-MIO-16E-2 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

Output

----------------- 5 V

•

MIO

For other DAQ devices, refer to your DAQ 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_Constants function or VI as described in

your software 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.

When you make a measurement using National Instruments software, the driver automatically uses the calibration constants to correct the measured voltages.

For an example of how to calibrate your module, refer to Appendix B, Calibration Sample Program.

National Instruments Corporation 5-3 SCXI-1102/B/C User Manual

Appendix

Specifications

This appendix lists the specifications for the SCXI-1102/B/C modules. These specifications are typical at 25° C unless otherwise noted.

SCXI-1102/B/C

Analog Input

Input Characteristics

Number of channels............................32 differential

Input signal ranges................................±100 mV (gain = 100) or

Max working voltage

(signal + common mode) ....................Each input should remain

±10 V (gain = 1)

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 SCXI-1102/B/C User Manual

Appendix A Specifications

Gain error (relative to calibration reference)

Gain = 1

After calibration.................... 0.015% of reading max

Before calibration ................. 0.04% of reading

Gain = 100

After calibration.................... 0.020% of reading max

Before calibration ................. 0.1% of reading

Amplifier Characteristics

Input impedance

Normal powered on ..................... >1 GΩ

Powered off................................. 10 kΩ

Overload ...................................... 10 kΩ

Input bias current...................................±0.5 nA

Input offset current................................±1.0 nA

CMRR

50 to 60 Hz, either gain 110 dB 90 dB 90 dB DC, gain 1 75 dB min 75 dB min 75 dB min DC, gain 100 100 dB min 100 dB min 100 dB min

Output range ..........................................±10 V

Output impedance ..............................91 Ω

Dynamic Characteristics

Bandwidth.......................................... 2 Hz (1102)

Scan interval (per channel, any gain)

0.012% ........................................ 3 µs

0.0061% ......................................10 µs

SCXI-1102/B/C User Manual A-2

1102 1102B 1102C

200 Hz (1102B) 10 kHz (1102C)

National Instruments Corporation

Filters

Appendix A Specifications

System noise (related to input)

1102 1102B 1102C

Gain = 1 50 µVrms 50 µVrms 70 µVrms Gain = 100 5 µVrms 5 µVrms 10 µVrms

Cutoff frequency (–3 dB)....................2 Hz (1102)

200 Hz (1102B) 10 KHz (1102C)

NMR (60 Hz)......................................40 dB (1102)

Step response (either gain)

1102 1102B 1102C

To 0.1% 1 s 10 ms 200 µs To 0.01% 10 s 100 ms 1 ms

Stability

Recommended warm-up time..............20 min.

Offset temperature coefficient

Gain = 1 .......................................20 µV/°C

Gain = 100 ...................................1 µV/°C

Gain temperature coefficient ............... 10 ppm/ °C

Physical

Dimensions.........................................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 SCXI-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

SCXI-1102/B/C User Manual A-4

National Instruments Corporation

Appendix

Calibration Sample Program

This appendix contains a sample program to help you calibrate your submodule.

Sample Program for Calibration

The following is a sample C program that implements the procedure discussed in the Gain and Offset Calibration section and

SCXI_Cal_Constants in Chapter 5, Calibration:

/* This sample program assists the user in calibrating the SCXI-1102. The

calibration constants are stored only in NI-DAQ memory. The (input, output) voltage pairs read by a DMM must be entered by hand. Before running this programed must run the NI-DAQ Configuration Utility to set up the DAQ board that will communicate with the SCXI-1102.

This program is written for the four-slot SCXI-1000 chassis. The program prompts for all required configurati on information a bout the SCXI c hassis. */

#include <ansi_c.h>

#include <dataacq.h>

#define SCXI1102 30 /* the SCXI-1102 module ID */

#define TWOPOINT 2 #define NIDAQMEM 0

void main()

{

char entry[4]; int SCXI_Chassis_ID,

moduleSlot, /* chassis slot of module

moduleChan; long modulesPresent[] = {-1, -1, -1, -1}; short operatingModes[] = {0, 0, 0, 0},

connectionMap[] = {0, 0, 0, 0},

commPath, /* DAQ board that communicates with

dummyRangeCode = 0,

dummyDAQboard,

dummyDAQchan = 0,

dummyDAQgain = 1,

to calibrate */

SCXI chassis */

National Instruments Corporation B-1 SCXI-1102/B/C User Manual

Appendix B Calibration Sample Program

dummyDAQrange, /* These dummy variables would be used

if the measurement actually came from a DAQ board and not an external DMM. */

ret;

double scale,

gain, vinput1, voutput1, vinput2, voutput2, bin_output1, bin_output2, bin_offset, gainerr, offset;

do {

printf("Enter the slot of the SCXI-1102: "); fflush(stdin);

ret = scanf("%d", &moduleSlot); } while (!ret || moduleSlot < 1 || moduleSlot > 4); modulesPresent[moduleSlot - 1] = SCXI1102; do {

printf("Enter the chassis ID of the chassi s containing the SCXI-1102: ");

fflush(stdin);

ret = scanf("%d", &SCXI_Chassis_ID); } while (!ret); commPath = SCXI_Chassis_ID; do {

printf("Enter the device number of the DAQ board communicating \n");

printf("with the chassis (default %d): ", SCXI_Chassis_ID);

fflush(stdin);

fgets(entry, 3, stdin);

if (strlen(entry) - 1) commPath = atof(entry); } while (!commPath); dummyDAQboard = connectionMap[moduleSlot - 1] = commPath;

/* Since the DAQ board is not

used to acquire data, the connectionMap does not need to

dummyDAQrange = 5.0 / dummyDAQgain; scale = pow(2.0, 12.0) * dummyDAQgain / 5; /* factor for converting to

SCXI_Set_Config(SCXI_Chassis_ID, 0, 0, 1, commPath, 4,

modulesPresent, operatingModes, connectionMap);

be accurate. */

format of 12-bit bipolar DAQ board with 5 V full scale*/

/* Set up communication path to

module. */

SCXI-1102/B/C User Manual B-2

National Instruments Corporation

Appendix B Calibration Sample Program

SCXI_Reset(SCXI_Chassis_ID, moduleSlot);

/* In reset state, the module

SCXI_Single_Chan_Setup(SCXI_Chassis_ID, moduleSlot, 0, dummyDAQboard);

for (moduleChan = 0; moduleChan < 31; moduleChan++) {

for (gain = 1; gain <= 100; gain = gain + 99) {

SCXI_Change_Chan(SCXI_Chassis_ID, moduleSlot, moduleChan); SCXI_Set_Gain(SCXI_Chassis_ID, moduleSlot, moduleChan, gain);

printf("Apply input voltage for point 1, channel %d, gain %.0f.\n", moduleChan, gain); do {

printf("Enter SCXI-1102 input voltage: "); fflush(stdin);

ret = scanf("%lf", &vinput1);/* User enters vinput1. */ } while (!ret); do {

printf("Enter SCXI-1102 output voltage: ");

fflush(stdin);

ret = scanf("%lf", &voutput1);/* User enters voutput1. */ } while (!ret);

will drive the MCH0+ output */

/* This is necessary only so that

SCXI_Change_Chan won't return an error. */

/* Select the channel and gain. */

printf("Apply input voltage for point 2, channel %d, gain %.0f.\n", moduleChan, gain);

do {

printf("Enter SCXI-1102 input voltage: ");

fflush(stdin);

ret = scanf("%lf", &vinput2);/* User enters vinput2. */ } while (!ret); do {

printf("Enter SCXI-1102 output voltage: ");

fflush(stdin);

ret = scanf("%lf", &voutput2);/* User enters voutput2. */ } while (!ret); bin_output1 = voutput1 * scale; bin_output2 = voutput2 * scale; /* Convert to format of DAQ

board. */

National Instruments Corporation B-3 SCXI-1102/B/C User Manual

Appendix B Calibration Sample Program

SCXI_Cal_Constants(SCXI_Chassis_ID, moduleSlot, moduleChan,

offset = bin_offset / scale; /* Convert from DAQ board

printf("Calculated offset %f V, gain error %f%% ", offset, gainerr); printf("and stored in NI-DAQ memory.\n\n");

}

TWOPOINT, NIDAQMEM, dummyRangeCode, gain, dummyDAQboard, dummyDAQchan, dummyDAQgain, 1, vinput1, bin_output1, vinput2, bin_output2, &bin_offset, &gainerr);

/* Calculate offset and gain error. */

format. */

SCXI-1102/B/C User Manual B-4

National Instruments Corporation

Appendix

Customer Communication

For your convenience, this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation. When you contact us, we need the information on the Technical Support Form and the configuration form, if your manual contains one, about your system configuration to answer your questions as quickly as possible.

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 telephon e support through our technical sup port 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, Internet address, such as documents are located in the /support directories.

National Instruments Corporation C-1 SCXI-1102/B/C User Manual

joesmith@anywhere.com, as your password. The support files and

ftp.natinst.com, as anonymous and use your

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.

support@natinst.com

)

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 03 9879 5166 02 9874 4455 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Canada (Ontario) 905 785 0085 905 785 0086 Canada (Quebec) 514 694 8521 514 694 4399 Denmark 45 76 26 00 45 76 26 02 Finland 09 725 725 11 09 725 725 55 France 01 48 14 24 24 01 48 14 24 14 Germany 089 741 31 30 089 714 60 35 Hong Kong 2645 3186 2686 8505 Israel 03 5734815 03 5734816 Italy 02 413091 06 57284309 Japan 03 5472 2970 03 5472 2977 Korea 02 596 7456 02 596 7455 Mexico 5 520 2635 5 520 3282 Netherlands 0348 433466 0348 430673 Norway 32 84 84 00 32 84 86 00 Singapore 2265886 2265887 Spain 91 640 0085 91 640 0533 Sweden 08 730 49 70 08 730 43 70 Switzerland 056 200 51 51 056 200 51 55 Taiwan 02 377 1200 02 737 4644 United States 512 794 0100 512 794 8411 United Kingdom 01635 523545 01635 523154

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 Display adapter __________________________ Mouse ___yes ___no Other adapters installed _________________________ ___ ___________ Hard disk capacity _____MB Brand _____________________________________________ Instruments used _________________________________________________________________

_______________________________________________________________________________ National Instruments hardware product model __________ Revisio n ______________________ Configuration _______________________________________ ____________________________ National Instruments software product ____________________________ Version ____________ Configuration ___________________________________________________________________ The problem is: __________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________ List any error messages: ___________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________ The following steps reproduce the problem:____________________________________________

_______________________________________________________________________________

SCXI-1102/B/C 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

DAQ hardware ___________ _______________________________________________________ _ Interrupt level of hardware __________________________________________________________ DMA channels of hardware _______ __________________________________________________ Base I/O address of hardware ________________________________________________________ Programming choice _______________________________________________________________ National Instruments application software version _______________________________________ Other boards in system ____________________________________ _________________________ Base I/O address of other boards _____________________________________________________ DMA channels of other boards ______________________________________________________ Interrupt level of other boards _______________________________________________________

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: SCXI Edition Date: August 1997 Part Number: 320975B-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.

_______________________________________________________________________________

™

-1102/B/C User Manual

Thank you for your help. Name _________________________________________________________________________ Title __________________________________________________________________________ Company _______________________________________________________________________ Address _________________________________________ _______________________________

_________________________________________ ______________________________________ Phone (___)__________________________ Fax (___)___________________________________

Mail to: Technical Publications Fax to: Technical Publications

National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway (512) 794-5678 Austin, TX 78730-5039

Prefix Meanings Value

Glossary

p- pico- 10 n- nano- 10 µ- micro- 10

m- milli- 10

k- kilo- 10

M- mega- 10

G- giga- 10

Numbers/Symbols

+5 V +5 volt signal

° degrees Ω ohms

% percent ± plus or minus

–12

–9

–6

–3

A amperes AC alternating current ACH analog input channel signal

National Instruments Corporation G-1 SCXI-1102/B/C User Manual

Glossary

A/D analog-to-digital ADC analog-to-digital converter–an electronic device, often an integrated

circuit, that converts an analog voltage to a digital number AIGND analog input ground signal AOGND analog output ground signal AWG American Wire Gauge

BCD binary-coded decimal 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 Celsius CE card enable signal CGND chassis ground signal channel 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. CJSENSOR cold-junction sensor CLK clock input signal CMOS complementary metallic oxide semiconductor CMRR common-mode rejection ratio

SCXI-1102/B/C User Manual G-2

National Instruments Corporation

Glossary

D/A digital-to-analog 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 DAQD*/A data acquisition digital to analog signal dB decibel—the unit for expressing a logarithmic measure of the ratio of

two signal levels: dB=20log10 V1/V2, for signals in volts DC direct current device a plug-in data acquisition board, card, or pad that can contain multiple

channels and conversion devices. Plug-in boards, PC cards, and devices

such as the DAQPad-1200, which connects to your computer parallel

port, are all examples of DAQ devices. SCXI modules are distinct from

devices, with the exception of the SCXI-1200, which is a hybrid. DGND digital ground signal DIFF differential configuration differential input an analog input consisting of two terminals, both of which are isolated

from computer ground, whose difference is measured DIN Deutsche Industrie Norme DMA direct memory access—a method by which data can be transferred to/

from computer memory from/to a device or memory on the bus while

the processor does something else. DMA is the fastest method of

transferring data to/from computer memory. DMM digital millimeter DNL differential nonlinearity—a measure in LSB of the worst-case deviation

of code widths from their ideal value of 1 LSB

National Instruments Corporation G-3 SCXI-1102/B/C User Manual

Glossary

DOUT digital output signal drivers/driver software software that controls a specific hardware device such as a DAQ device

EISA Extended Industry Standard Architecture ESP Engineering Software Package EXTCONV external control signal to trigger A/D conversions EXTINT external interrupt signal

Ffarads FIFO first-in first-out memory buffer—the first data stored is the first data

sent to the acceptor. FIFOs are often used on DAQ devices to temporarily store incoming or outgoing data until that data can be retrieved or output. For example, an analog input FIFO stores the results of A/D conversions until the data can be retrieved into system memory, a process that requires the servicing of interrupts and often the programming of the DMA controller. This process can take several milliseconds in some cases. During this time, data accumulates in the FIFO for future retrieval. With a larger FIFO, longer latencies can be tolerated. In the case of analog output, a FIFO permits faster update rates, because the waveform data can be stored on the FIFO ahead of time. This again reduces the effect of latencies associated with getting the data from system memory to the DAQ device.

ft feet

Ggain GATE gate input signal

SCXI-1102/B/C User Manual G-4

National Instruments Corporation

Glossary

hex hexadecimal Hz he rtz—the number of sca ns read or u pdates written per sec ond

in. inches indirect scanning The measurement that occurs when a signal passes on the SCXIbus

from the scanned SCXI module to the cabled SCXI module I/O input/output—the transfer of data to/from a computer sy stem involving

communications channels, operator interface devices, and/or data

acquisition and control interfaces ISA Industry Standard Architecture

LED light-emitting diode LSB least significant bit

MB megabytes of memory MSB most significant bit

NC not connected (signal) NRSE nonreferenced single-ended mode—all measurements are made with

respect to a common (NRSE) measurement system reference, but the

voltage at this reference can vary with respect to the measurement

system ground

National Instruments Corporation G-5 SCXI-1102/B/C User Manual

Glossary

OUT output signal OUTREF output reference signal

PCMCIA an expansion bus architecture that has found widespread acceptance as

a de facto standard in notebook-size computers. It originated as a specification for add-on memory cards written by the Personal Computer Memory Card International Association.

RAM random-access memory RMA Return Mate rial Authorization rms root mean square—the square root of the average value of the square of

the instantaneous signal amplitude; a measure of signal amplitude RSVD reserved bit RTSI bus real-time system integration bus—the National Instruments timing bus

that connects DAQ devices directly, by means of connectors on top of

the boards, for precise synchronization of functions

Ssamples s seconds SCANCLK scan clock s ignal SCXI Signal Conditioning eXtensions for Instrumentation—the National

Instruments product line for conditioning low-level signals within an

external chassis near sensors so only high-level signals are sent to DAQ

devices in the noisy PC environment SERCLK serial clock signal

SCXI-1102/B/C User Manual G-6

National Instruments Corporation

Glossary

SERDATIN serial data input signal SERDATOUT serial data output signal signal conditioning the manipulation of signals to prepare them for digitizing SLOT0SEL* Slot 0 select signal

TTL transistor-transistor logic

Vvolts VCC positive supply voltage from the PCMCIA bus (usually +5V) VDC volts, direct current 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

National Instruments Corporation G-7 SCXI-1102/B/C User Manual

volts, input high volts, input low volts in volts, output high volts, output low

Index

Numbers

+5 V signal (table), 3-3

analog circuitry, 4-3 to 4-4

analog bus switch, 4-4 analog input channels, 4-3

analog configuration, 2-4 to 2-5

bent and trimmed resistor (figure), 2-5 current-loop receivers, 2-4 to 2-5

analog input signal connections, 3-3 to 3-6

differential input signal range, 3-3 to 3-4 exceeding input level or range (caution), 3-4 ground-referencing of signals, 3-4 to 3-6

floating signal connections

referenced to chassis ground (figure), 3-6

ground-referenced signal connections

(figure), 3-5

signal terminals, 3-3

analog input specifications, A-1 to A-3

amplifier characteristics, A-2 dynamic characteristics, A-2 to A-3 input characteristics, A-1

transfer characteristics, A-1 to A-2 analog output signal connections, 3-9 AOGND signal (table), 3-8

bent and trimmed resistor (figure), 2-5 bulletin board support, C-1

cables, custom, 1-6 calibration, 5-1 to 5-3

equipment requirements, 5-1 to 5-2 gain and offset calibration, 5-2 to 5-3 overview, 5-1

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 CJSENSOR signal (table), 3-3 cold-junction sensor connections, 3-6 ComponentWorks software, 1-3 configuration, 2-1 to 2-5

analog configuration, 2-4 to 2-5

bent and trimmed resistor (figure), 2-5

current-loop receivers, 2-4 to 2-5 digital configuration, 2-3 to 2-4 hardware installation, 2-6 parts locator diagram, 2-2 removing SCXI module cover (figure), 2-4

current-loop receivers, 2-4 to 2-5 custom cables, 1-6 customer communication, xii, C-1 to C-2

DAQD*/A signal

description (table), 3-8 SCXIbus to SCXI-1102/B/C to DAQ board

pin equivalencies (table), 3-10 DGND signal (table), 3-8 digital configuration, 2-3 to 2-4

National Instruments Corporation I-1 SCXI-1102/B/C User Manual

Index

digital control circuitry, 4-2 to 4-3 digital I/O signal connections, 3-9 to 3-10 digital signal specifications, 3-10 digital timing signal connection, 3-10 documentation

conventions used in manual, x to xi National Instruments documentation,

xi to xii

organization of manual, ix to x

electronic support services, C-1 to C-2 e-mail support, C-2 environment specifications, A-4 equipment, optional, 1-5

fax and telephone support, C-2 Fax-on-Demand support, C-2 filter specifications, A-3 floating signal connection

referenced to chassis ground (figure), 3-6

front connector, 3-1 to 3-6

analog signal connections, 3-3 to 3-6 cold-junction sensor connections, 3-6 ground-referencing of signals, 3-4 to 3-6

floating signal connection

referenced to chassis ground (figure), 3-6

ground-referenced signal connection

(figure), 3-5 pin assignments (figure), 3-2 signal descriptions (table), 3-3

FTP support, C-1

gain and offset calibration, 5-2 to 5-3 ground-referencing of signals, 3-4 to 3-6

floating signal connections

referenced to chassis ground (figure), 3-6

ground-referenced signal connections

(figure), 3-5

installation. See also configuration.

hardware installation, 2-6 unpacking the SCXI-1102/B/C, 1-6

jumpers

digital configuration, 2-3 to 2-4 parts locator diagram, 2-2

LabVIEW software, 1-3 LabWindows/CVI software, 1-3

manual. See documentation. MCH0+ signal (table), 3-8 MCH0- signal (table), 3-8 module configuration. See configuration.

National Instruments application software, 1-3 NI-DAQ driver software, 1-4

operation of SCXI-1102/B/C. See theory of

operation.

OUTREF signal (table), 3-8

SCXI-1102/B/C User Manual I-2

National Instruments Corporation

Index

parts locator diagram, 2-2 physical specifications, A-3 pin assignments

front connector (figure), 3-2 rear connector (figure), 3-7

power requirements, A-4

rear signal connector, 3-8 to 3-10

analog output signal connections, 3-9 digital I/O signal connections, 3-9 to 3-10 digital signal specifications, 3-10 digital timing signal connections, 3-10 pin assignments (figure), 3-7 SCXIbus interface connection, 4-2 SCXIbus to SCXI-1102/B/C to DAQ

board pin equivalencies (table), 3-10

signal descriptions (table), 3-8 to 3-9 register-level programming, 1-5 requirements for getting started, 1-2

SCANCLK signal (table), 3-8 SCXI-1102/B/C. See also theory of operation.

block diagram, 4-1

custom cables, 1-6

features and overview, 1-1 to 1-2

optional equipment, 1-5

requirements for getting started, 1-2

software programming choices, 1-3 to 1-5

National Instruments application

software, 1-3 NI-DAQ driver software, 1-4 register-level programming, 1-5

unpacking, 1-6 SCXIbus connector, 4-2 SCXIbus interface, 4-2

SCXIbus to SCXI-1102/B/C to DAQ board

pin equivalencies (table), 3-10

SERCLK signal

description (table), 3-9 SCXIbus to SCXI-1102/B/C to DAQ

board pin equivalencies (table), 3-10

SERDATIN signal

description (table), 3-8 SCXIbus to SCXI-1102/B/C to DAQ

board pin equivalencies (table), 3-10

SERDATOUT signal

description (table), 3-8 SCXIbus to SCXI-1102/B/C to DAQ

board pin equivalencies (table), 3-10 settling time for channels (note), 4-3 signal connections, 3-1 to 3-10

front connector, 3-1 to 3-6

analog input signal connections,

3-3 to 3-6 cold-junction sensor connections, 3-6 ground-referencing of signals,

3-4 to 3-6 pin assignments (figure), 3-2 signal descriptions (table), 3-3

rear connector, 3-7 to 3-10

analog output signal connections, 3-9 digital I/O signal connections,

3-9 to 3-10 digital signal specifications, 3-10 digital timing signal

connections, 3-10 pin assignments (figure), 3-7 SCXIbus to SCXI-1102/B/C to DA

Q board pin equivalencies

(table), 3-10 signal descriptions (table), 3-8 to 3-9

SLOT0SEL* signal

description (table), 3-8 SCXIbus to SCXI-1102/B/C to DAQ

board pin equivalencies (table), 3-10

software programming choices, 1-3 to 1-5

National Instruments Corporation I-3 SCXI-1102/B/C User Manual

Index

National Instruments application

software, 1-3 NI-DAQ driver software, 1-4 register-level programming, 1-5

specifications, A-1 to A-4

amplifier characteristics, A-2 analog input, A-1 to A-3 digital signal specifications, 3-10 dynamic characteristics, A-2 to A-3 environment, A-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 system requirements, 1-2

technical support, C-1 to C-2 telephone and fax support, C-2 temperature sensor, 4-3 theory of operation, 4-1 to 4-4

analog circuitry, 4-3 to 4-4

analog bus switch, 4-4

analog input channels, 4-3 block diagram of SCXI-1102/B/C, 4-1 digital control circuitry, 4-2 to 4-3 functional overview, 4-1 to 4-4 rear signal connector, 4-2 SCXIbus connector, 4-2 SCXIbus interface, 4-2

W1 jumper, configuration, 2-3 to 2-4

VirtualBench software, 1-3

SCXI-1102/B/C User Manual I-4

National Instruments Corporation

DAQ SCXI-1102, SCXI-1102B, SCXI-1102C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important Information

Warranty

Copyright

Trademarks

Figures

Tables

Organization of This Manual

Conventions Used in This Manual

National Instruments Documentation

Customer Communication

About the SCXI-1102/B/C Modules

What You Need to Get Started

National Instruments Application Software

Optional Equipment

Custom Cables

Unpacking

Module Configuration

Digital Configuration

Figure 2-2. Removing the SCXI Module Cover

Analog Configuration

Figure 2-3. Bent and Trimmed Resistor

Hardware Installation

Front Connector

Front Connector Signal Descriptions

Analog Input Signal Connections

Figure 3-2. Ground-Referenced Signal Connection

Cold-Junction Sensor Connection

Rear Signal Connector

Rear Signal Connector Descriptions

Analog Output Signal Connections

Digital I/O Signal Connections

Digital Timing Signal Connection

Digital Signal Specifications

Functional Overview

Digital Control Circuitry

Analog Circuitry

Analog Input Channels

Analog Bus Switch

Overview

Calibration Procedure

Calibration Equipment Requirements

Gain and Offset Calibration

Sample Program for Calibration

Glossary

Index