Harmonics function
KEW 2062/2062BT
- 47 -
KEW 2062/2062BT
Harmonics RMS current
(Ak: 1
st
fundamental wave to 30
th
harmonics) [Arms]
Range, Display digit, effective input range
Same as the RMS current
Display range
Same as the RMS current
*Content rate 0.0% to 100.0% against fundamental wave
Accuracy
RMS:
1 to 10
th
: ±5.0%rdg±10dgt
11 to 20
th
: ±10%rdg±10dgt
21 to 30
th
: ±20%rdg±10dgt
Content range:
±1 against the calculated results of each order.
Formula
Ak=
��
(
Akr
)
2
+ (
Aki
)
2
1
n=-1
k : Harmonics order
Ar : Real number after current
FFT conversion
Ai : Imaginary number after current
FFT conversion
* Content rate
=
𝐴𝐴𝐴𝐴𝑉𝑉𝑉𝑉
×
100
𝐴𝐴𝐴𝐴1
(
𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹
𝑤𝑤𝑤𝑤𝐹𝐹𝐹𝐹𝑤𝑤𝑤𝑤𝐹𝐹𝐹𝐹
)
Total harmonics voltage distortion factor (V THD-F) [%]
Display digit
4-digit
Display range
0.0% to 100.0%
Accuracy
±1 against the calculated results of each measured value.
Formula
V THD-F
=
�∑
(
Vk
)
2
30
k=2
×100
V1(Fundamental wave)
V : Harmonics voltage
k : Harmonics order
Total harmonics current distortion factor (A THD-F) [%]
Display digit
4-digit
Display range
0.0% to 100.0%
Accuracy
±1 against the calculated results of each measured value.
Formula
A THD-F
=
�∑
(
Ak
)
2
30
k=2
×100
A1(Fundamental wave)
A : Harmonics current
k : Harmonics order
KEW 2062/2062BT
Phase detection function
KEW 2062/2062BT
- 48 -
Total harmonics voltage distortion factor (V THD-R) [%]
Display digit
4-digit
Display range
0.0% to 100.0%
Accuracy
±1 against the calculated results of each measured value.
Formula
V THD-R
=
�∑
(
Vk
)
2
30
k=2
×100
�∑
(
Vk
)
2
30
k=1
V : Harmonics voltage
k : Harmonics order
Total harmonics current distortion factor (A THD-R) [%]
Display digit
4-digit
Display range
0.0% to 100.0%
Accuracy
±1 against the calculated results of each measured value.
Formula
A THD-R
=
�∑
(
Ak
)
2
30
k=2
×100
�∑
(
Ak
)
2
30
k=1
A : Harmonics current
k : Harmonics order
Phase detection function
Effective input
range
RMS voltage (ACV) 80 to 1100 V when measured waveform is 45 to 65 Hz
sine wave.
If there’s no phase differences between each voltage phases,
differences of voltage amplitude within 10%
If phase voltage is balanced, phase difference:
3P4W (Three-phase 4-wire)
within ±30°
3P3W (Three-phase 3-wire)
within ±15°
Display
(1.2.3) Discontinuous buzzer: Pi, Pi, Pi
(3.2.1) Continuous: Pii
(-.-.-) No buzzer sounds
: Positive phase, all phases live
: Negative phase, all phases live
: Unjudgeable
Missing phase, abnormal
Frequency, out of voltage
effective input range, unbalance
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