Publicité
Fonctions du mode d'analyse
Mode d'analyse
OFF
Spectre linéaire
Spectre RMS
Spectre de tension
Fonction de transfert
Interspectre
Fonction de cohérence
Spectre de phase
Formules d'analyse interne (linéaire, réel, imag. [imaginary], log. [logarithm])
Pas d'analyse.
N
−
1
∑
=
kn
=
X
(
k
)
x
(
n
)
W
F
(
k
)
=
n
0
{
=
=
linear
F
(
k
)
real
Re
F
(
k
⎧
1
=
=
F
( '
k
)
C
'
F
(
k
)
C
'
⎨
/ 1
⎩
{
=
=
linear
F
( '
k
)
real
Re
F
( '
⎧
1
2
=
=
P
(
k
)
a
F
(
k
)
a
⎨
/ 1
( 2
⎩
=
=
linear
P
(
k
)
log
10
log
P
=
H
(
k
)
Y
(
k
/ )
X
(
k
)
{
=
=
linear
H
(
k
)
real
Re
H
(
: Interspectre
=
*
S
(
k
)
X
(
k
)
Y
(
k
)
yx
=
=
X
(
k
)
AS
(
k
)
A
power
yx
linear
=
X
(
k
)
real
=
Re
power
{
}
=
=
mag
Im
X
(
k
)
log
10
power
HIOKI MR8875A985-04
10.9 Modes d'analyse FFT
⎧
/ 1
N
(
DC
)
=
CX
(
k
)
C
⎨
/ 2
N
(
AC
)
⎩
}
{
}
=
)
imag
Im
F
(
k
)
log
(
DC
)
( 2
AC
)
}
{
}
=
k
)
imag
Im
F
( '
k
)
(
DC
)
AC
)
(
k
)
}
{
}
=
k
)
imag
Im
H
(
k
)
log
⎧
2
/ 1
N
⎨
2
/ 2
N
⎩
{
}
X
(
k
)
power
log
X
(
k
)
power
255
=
20
log
F
(
k
)
=
log
20
log
F
( '
k
)
=
20
log
H
(
k
)
10
Publicité
