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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
21-11Current Measurement
has found a new life in the form of dedicated integrated circuit chips that produce a ground-referenced
measure of the voltage across a shunt in the positive power rail.
Referring to Figure 21.8, the current from a power source drives a changing load via a shunt resistor
R
s
, which is chosen to drop 10–100 mV or so at the maximum current to be measured. e load current
creates voltages V
r
and V
s
with the dierence between them equal to the load current A
l
times the resis-
tance R
s
. e operational amplier requires that the voltage at its inverting input match the reference
voltage V
r
, which it accomplishes by turning on ...
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Publisher Resources

ISBN: 9781439848913