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Measured Values Computation
Measured values per phase x (channel x – values are indexed x)10
10-3
Measured values per phase x (channel x – values are indexed x)
For the majority of values, such as rms, power, calculated values as impedance, power factor,
the corresponding ones of the fundamental “H01” are also available. Due to the frequent
distortion by harmonics, it is often better to use H01 values for the phase shift between voltage
and current (angle) or for the reactive power caused by inductive or capacitive load. However, a
stable synchronization source must be present and selected.
RMS
⋅=
T
0
2
RMS
dtu
T
1
U
⋅=
T
0
2
RMS
dti
T
1
I
Mean
[1]
⋅⋅=
T
0
M
dtu
T
1
U
⋅⋅=
T
0
M
dti
T
1
I
Rectified mean
⋅⋅=
T
0
RM
dt|u|
T
1
U
⋅⋅=
T
0
RM
dt|i|
T
1
I
Positive peak
)u(MAXU
P
=
+
)i(MAXI
P
=
+
Negative peak
)u(MINU
P
=
−
)i(MINI
P
=
−
Peak-to-Peak
−+
−=
PPPP
UUU
−+
−=
PPPP
III
Crest factor
[2]
RMS
P
CF
U
U
U =
RMS
P
CF
I
I
I =
Form factor
RMS
RM
FF
U
U
U =
RMS
RM
FF
I
I
I =
Rectified mean corrected
1107,1UU
RMRMC
⋅=
(
22
U
RM
⋅
π
⋅
) - not for current
Harmonic distortion
[3]
01H
2
01H
2
RMS
THD
U
UU
U
−
=
01H
2
01H
2
RMS
THD
I
II
I
−
=
Harmonic content
[4]
RMS
2
01H
2
RMS
HC
U
UU
U
−
=
RMS
2
01H
2
RMS
HC
I
II
I
−
=
Fundamental content
RMS
01H
FC
U
U
U =
RMS
01H
FC
I
I
I =
Note
In W3 system, voltages listed above are both available for the phase voltage
U
x
(measured) and for the phase-to-phase voltage U
xy
(calculated). In W2
system, the phase-to-phase voltage U
xy
is directly connected to the input of
the channel and measured. Phase voltage values are unavailable.
Phase shift of fundamental
to reference (sync)
ϕ U H01 ϕ I H01
Active Power
⋅⋅⋅=
T
0
dtiu
T
1
P
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct.com
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