Chroma 66200 Series - Page 29

Operation
PF (Power Factor)
PF= W / (V
rms
× I
rms
)
CF (Crest Factor)
It is to measure the crest factor of input current by the following formula:
rms
pk
I
I
CF =
THDv (Total Harmonic Distortion of Voltage)
66202 Power Meter is able to measure the harmonic distortion range from level 2 – 100 that is
defined by users as required. The calculation formula of
is listed below:
v
THD
%100
.......
1
22
5
2
4
2
3
2
2
×
++++
=
V
VVVVV
THD
n
v
The subscript n in
indicates the level number of harmonic. The range is 2.3.4….100.
See
4.4.3 Meas Function for detail description.
2
n
V
THDi (Total Harmonic Distortion of Current)
66202 Power Meter is able to measure the harmonic distortion range from level 2 – 100 that is
defined by users as required. The calculation formula of
is listed below:
i
THD
%100
.......
1
22
5
2
4
2
3
2
2
×
++++
=
I
IIIII
THD
n
i
The subscript n in indicates the level number of harmonic. The range is 2.3.4….100.
See
4.4.3 Meas Function for detail description.
2
n
I
F (Frequency)
The frequency measurement of 66200 Series Power Meter is to measure the signal frequency
of input voltage. It gets the average value of voltage signal after input within certain time
unit. The measured voltage frequency will also be the time base for measuring current.
When measuring AC voltage frequency the input signal voltage should be larger than the
range for 10% or above. Since the frequency measurement is to detect the zero cross signal
of input voltage, huge noise on the input signal will cause measurement error. The noise peak
should not exceed the range for 5% or above.
E (Energy)
66202 Power Meter allows users to set the time for power measurement in two kinds of unit -
W-hour and Joule. The calculation formula is:
dtIVE
D
ii
∫
×=
0
)(
4-7