Hioki PW3335 - Calculation Formulas Specifications

5.5 Calculation Formulas Specifications
159
Basic measurement parameter calculation formulas
(1) Voltage calculation formulas
5.5 Calculation Formulas Specifications
Item (RECTIFIER) Calculation formulas
RMS value (AC+DC)
Average value rectification
RMS value converted value
(AC+DC Umn)
Simple average value (DC)
AC component RMS value (AC)
Fundamental wave component RMS
value (FND)
U
1
from harmonic calculation formula
Waveform peak value
Displays the maximum absolute value from the above with its polarity.
Total harmonic distortion
U
thd
from harmonic calculation formula
Ripple rate
Crest factor
M: Number of samples between synchronized timing points; s: Sample point number
∑
1M
0s
2
s
)(
M
1
−
=
= uU
||
M
1
22
s
1M
0s
mn
∑
uU
−
=
=
π
∑
1M
0s
sDC
M
1
−
=
= uU
2
DC
2
AC
)()( UUU −=
=
pk
U
spk
: uU
+
s－pk
: uU
Maximum value from M values
Minimum value from M values
100×
||×2
|)(|
=
DC
-pkpk+
rf
U
UU
U
－
U
U
U
pk
cf
=