FFT Calculation Types
Calculation types and internal calculation formulas
Calculation type
Off
Linear spectrum
RMS spectrum
Power spectrum
Phase spectrum
Cross power spectrum
Transfer function
Coherence function
254
Internal calculation formula (real: real part, imag: imaginary part, log: logarithm)
Does not perform any calculation.
( ) = ∑ ( )
= | () |
= { () }
( ) = ( )
= | () |
= Re { () }
( ) = | ( )|
2
log = 10log | () |
= ()
( ) = 180/ × tan
(Im(
−1
( ) = 180/ × tan
(Im(
−1
( ) =
( ) ( ) :
∗
Cross spectrum
( ) =
( )
=
( )
= Im{
()}
( ) = ( ) /()
= | () | = Re { () }
()
()
∗
ℎ ( ) = √
()
()
HIOKI MR6000A966-03
( ) = ( )
= Im { () }
1
()
={
1/√2()
= Im { () }
1
()
= {
1/2 (
( ) )/Re(
( ) ))
'
'
( ) )/Re(
( ) ))
1/
(DC)
2
=
2/
(AC)
2
= Re{
( ) }
log = 10log
()
= Im { () }
1/()
= {
2/()
log = 20log | () |
log = 20log | () |
log = 20log | () |
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