National Instruments VXI-SC-1102 Theory of Operation

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

Chapter

Theory of Operation

This chapter contains a functional overview of the VXI-SC-1102/B/C

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.

Figure 4-1. VXI-SC-1102/B/C Block Diagram

Front Signal Connector

CH 0 +

Gain 0

CH 0 –

CH 31+

CH 31 –

Lowpass

Filter

Digital

Control

Calibration EEPROM

Lowpass

Filter

Lowpass

Filter

CJSENSOR

Gain 31 Gain

Register

Connector to Carrier Module

Switch Analog Bus +

Switch Analog Bus -

32-to-1 Mux

Inst.

Amp

Buffer

Mux

Input Protection

and Lowpass Filter

Inst.

Amp

Buffer

–

Input Protection

and Lowpass Filter

Input Protection

and Lowpass Filter

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Page Page Tables About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction About the VXI-SC-1102/B/C What You Need to Get Started Software Programming Choices National Instruments Application Software NI-DAQ Driver Software plug&play VXI Instrument Driver Optional Equipment Unpacking Installation Figure 2-1. VXI-SC-1102/B/C Parts Locator Diagram Current-Loop Receivers Page Signal Connections Front Connector Chapter 3 Signal Connections Figure 3-1. VXI-SC-1102/B/C Front Connector Pin Assignments VXI-SC-1102/B/C User Manual 3-2 National Instruments Corporation Signal Descriptions Channel Input Signal Connections Ground-Referencing Your Signals Chapter 3 Signal Connections Figure 3-2. Ground-Referenced Signal Connection National Instruments Corporation 3-5 VXI-SC-1102/B/C User Manual Cold-Junction Sensor Connection National Instruments Corporation 4-1 VXI-SC-1102/B/C User Manual Theory of Operation 32-to-1 Mux CJSENSOR Gain 0 Front Signal Connector VXIbus Interface Digital Control Circuitry Analog Circuitry Analog Input Channels Page Calibration Calibration Equipment Requirements Gain and Offset Calibration Page Page A Specifications VXI-SC-1102/B/C Analog Input Input Characteristics Transfer Characteristics Amplifier Characteristics Dynamic Characteristics Filters Stability Physical Page B Calibration Sample Program Sample Program for Calibration VXI-SC-1102/B/C User Manual B-2 National Instruments Corporation National Instruments Corporation B-3 VXI-SC-1102/B/C User Manual VXI-SC-1102/B/C User Manual B-4 National Instruments Corporation C Customer Communication FTP Support Electronic Services Bulletin Board Support Telephone and Fax Support Telephone Fax Fax-on-Demand Support E-Mail Support (currently U.S. only ) Technical Support Form VXI-SC-1102/B/C Submodule Hardware and Software Configuration Form National Instruments Products Other Products Documentation Comment Form Title: Edition Date: Part Number: Mail to: Technical Publications Fax to: Glossary Numbers/Symbols A B C D F G H I L M N R S T V W Index Numbers A B C D E F G H I S T U V