Answered: When trying to measure microvolt…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

When trying to measure microvolt signals from a sensor, a student encounters problems with electromagnetic
interfererice, even after placing the sensor and it's preamplifier in a grounded aluminum box. She suspects that the
problem is caused by magnetic coupling between the 240 V power lines and the cable connecting the sensor to the
preamplifier, if she is correct. what further changes will reduce the interference the most?
Select one:

a.Using a coaxial cable between
sensor and preamplifier and reducing the input
impedance of the preamplifier.
b. Using a twisted-pair cable between sensor and preamplifier and increasing the input impedance of the preampliner
c.Using a twisted-pair cable between sensor and preamplifiier and reducing the input impedance of the preamplifier.
d. Using a coaxial cable between sensor and preamplifier and increasing the input impedance of the preampliner

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