54
IM CW500-02EN
Rms harmonic current Ak [Arms]
Range
Same as rms current
Display digits
Same as rms current
Display range
Same as rms current
*
Percentage content 0.0% to 100.0% Percentage to the
fundamental waveform
Measurement
system
Complies with IEC61000-4-7, IEC61000-2-4
The analysis window span is 10/12 cycles at 50/60 Hz. The
measurement includes the intermediate harmonic component
adjacent to the harmonics being analyzed.
Accuracy
The IEC61000-2-4 Class3 accuracy is defined in the 10% to
100% input range of the measurement range.
10% or higher of the range maximum:
±10% rdg + current clamp-on probe accuracy
Less than 10% of the range maximum:
Range maximum ± 1.0% + current clamp-on probe accuracy
Equation
(
)
(
)
(
)
(
)
∑
−
=
+
+
+
=
1
1
2
2
10
10
n
i
n
k
c
r
n
k
c
ck
A
A
A
Percentage content
1
100
c
ck
A
A
×
=
c: measurement channel
A
1k
,
A
2k
,
A
3k
,
A
4k
,
k: harmonic order
r: real component after taking the FFT,
i: imaginary component after taking the FFT
The measurement interval of the equation is 10 cycles. For 12
cycles, replace “10k+n” with “12k+n” in the equation.
Specifications