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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
18-1
Instruments for the measurement of electric voltage are called voltmeters. Correct insertion of a voltme-
ter
re
quires
th
e
co
nnection
of it
s
te
rminals
to th
e
po
ints
of an el
ectric
ci
rcuit
ac
ross
wh
ich
th
e
vo
ltage
ha
s
to be me
asured,
as sh
own
in Fi
gure
18.1. To a r
st
ap
proximation,
th
e
el
ectric
eq
uivalent
ci
rcuit
of a
vo
ltmeter
ca
n
be re
presented
by re
sistive
im
pedance
Z
v
(or a pure resistance R
v
for dc voltmeters). is
me
ans
t
hat
a
ny
v
oltmeter,
o
nce
c
onnected
to a
n
e
lectric
c
ircuit,
d
raws
a c
urrent
I
v
given by
I
V
Z
v
v
=
(18.1)
where V is the measured voltage. e higher the value of the internal impedance, the higher the quality
of t
he
v
oltme ...
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Publisher Resources

ISBN: 9781439848913