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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 377

Electrically isolating data acquisition systems

Guy Hoover and William Rempfer

Abstract

A circuit for electrically isolating data acquisition systems is described.

Keywords

Data acquisition

electrical isolation

LTC1090

Introduction

In data acquisition systems it is often necessary to electrically isolate the measurement points from the system controller. Reasons for the electrical isolation include the following: to allow floating measurements at high voltages; for safety, to reduce the danger of electrical shock, as might occur in medical applications; and to eliminate ground loops between measurement points and the system controller which can cause errors.

The data transmitted over the isolated lines can be either analog ...

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