
18-11Meter Voltage Measurement
18.5 Electronic Voltmeters
Electronic meters process the input signal by means of semiconductor devices in order to extract the
in
formation
re
lated
to th
e
re
quired
me
asurement
[3
,4]
. An el
ectronic
me
ter
ca
n
be ba
sically
re
presented
as a t
hree-port
e
lement,
a
s
s
hown
i
n
F
igure
1
8
.8.
e in
put
sig
nal
po
rt
is an in
put
po
rt
ch
aracterized
by hi
gh
im
pedance,
so th
at
th
e
sig
nal
so
urce
ha
s
ve
ry
li
ttle
lo
ad
. e me
asurement
re
sult
po
rt
is an ou
tput
po
rt
th
at
pr
ovides
th
e
me
asurement
re
sult
(i
n
ei
ther
an an
alog
or di
gital
fo
rm,
de
pending
on th
e
wa
y
th
e
in
put
sig
nal
is pr
ocessed)
al
ong
wi
th
th
e
po
wer
ne
eded
to en
ergize
th
e
de ...