KYORITSU 6315 Instruction Manual - Manual (Page 147)

Items measured at Harmonics measurement KEW6315
- 145 - KEW6315
R.m.s. harmonics current Ak [Arms]
Range Same as r.m.s. current
Displayed digit Same as r.m.s. current
Display range
Same as r.m.s. current
* Rate of content: 0.0% - 100.0% (percentages to the basic wave)
Meas. system
Complied with IEC61000-4-7, IEC61000-2-4
Analysis window width: 10/12 cycle for 50/60Hz, Measured values contain the
inter-harmonics adjacent to the analyzed orders’ harmonics
Accuracy
Meets the accuracy specified in IEC61000-2-4 Class3 at 10% - 100% of
the input range of the measurement range.
10% or more to max. input range
: ±10%rdg + Accuracy of Clamp sensor
Less than 10% to max. input range : max value of the range±1.0% +
Accuracy of Clamp sensor
Equation
( ) ( ) ( ) ( ) ∑
− =
+ +
+ =
1
1
2 2
10 10
n
i n k c r n k c ck
A A A
1
100
c
ck
A
A
×
=
c: Measurement channel: A
1k,
A
2k,
A
3k,
A
4k
, k: Harmonics of each order
r: Real number after FFT conversion, i: Imaginary number after FFT conversion
Measurement cycle in this equation is 10-cycle. For 12-cycle measurement,
"10k+n" should be replaced with "12k+n”.
Harmonics power Pk [W]
Range Same as active power
Displayed digit Same as active power
Display range
Same as active power * rate of content 0.0% - 100.0%, percentage against the
absolute value of basic wave
Meas. system Complied with IEC61000-4-7
Accuracy
±0.3%rdg±0.2%f.s.+ accuracy of clamp sensor (PF 1, sine wave: 50/60Hz)
(Sum represents the total values obtained through the used channels.)
Equation
Pc
k
=V
c(10k)r
×A
c(10k)r
-V
c(10k)i
×A
c(10k)I
1
100
c
ck
P
P
×
=
c: Measurement channel, k: Harmonics of each order
r: Real number after FFT conversion, i: Imaginary number after FFT conversion
Measurement cycle in this equation is 10-cycle. For 12-cycle measurement,
"10k" should be replaced with "12k”.
1P2W-1 to 4 P
1k,
P
2k,
P
3k,
P
4k,
P
sumk
=P
1k
+P
2k
+P
3k
+P
4k
1P3W-1 to 2 P
1k,
P
2k,
P
sum1k
=P
1k
+P
2k
P
3k,
P
4k,
P
sum2k
=P
3k
+P
4k
P
sumk
=P
sum1k
+P
sum2k
3P3W-1 to 2 P
1k,
P
2k,
P
sum1k
=P
1k
+P
2k
P
3k,
P
4k,
P
sum2k
=P
3k
+P
4k
P
sumk
=P
sum1k
+P
sum2k
3P3W3A Phase voltage P
1k
:V
1
= ( V
12
-V
31
)/3
,
P
2k
:V
2
= ( V
23
-V
12
)/3
,
P
3k
:V
3
= ( V
31
-V
23
)/3
,
P
sumk
=P
1k
+P
2k
+P
3k
3P4W P
1k,
P
2k,
P
3k,
P
sumk
=P
1k
+P
2k
+P
3k
Rate of
content
Rate of
content