
92-1
92.1 Introduction
e fundamental task of a data acquisition system is the measurement or generation of real-world physical
si
gnals
. Be
fore
a ph
ysical
si
gnal
ca
n
be me
asured
by a co
mputer-based
sy
stem,
a se
nsor
or tr
ansducer
is us
ed
to co
nvert
th
e
ph
ysical
si
gnal
in
to
an el
ectrical
si
gnal,
su
ch
as vo
ltage
or cu
rrent
. O
en
on
ly
a pl
ug-in
da
ta
ac
quisition
(D
AQ)
bo
ard
is co
nsidered
th
e
da
ta
ac
quisition
sy
stem;
ho
wever,
a bo
ard
is on
ly
on
e
of th
e
co
m-
ponents
in th
e
sy
stem
. A co
mplete
DA
Q
sy
stem
co
nsists
of se
nsors,
si
gnal
co
nditioning,
in
terface
ha
rdware,
an
d
so
ware
. Un
like
st
and-alone
in
struments,
si
gnals
o
en
ca
nnot
be di
rectly
co
nnected ...