7-39
IM WT3001E-51EN
Harmonic Measurement in Normal Measurement Mode (Option)
1
2
3
4
5
6
7
8
9
10
11
12
13
Index
Item
Specifications
Accuracy
On models with the advanced computation (/G6) option
• When the line filter (5.5 kHz) is ON
Frequency
Voltage and Current
±(reading error + measurement
range error)
Power
±(reading error + measurement
range error)
10 Hz ≤ f < 30 Hz
30 Hz ≤ f ≤ 66 Hz
66 Hz < f ≤ 440 Hz
440 Hz < f ≤ 1 kHz
1 kHz < f ≤ 2.5 kHz
2.5 kHz < f ≤ 3.5 kHz
0.25% of r 0.3% of range
0.2% of r 0.15% of range
0.5% of r 0.15% of range
1.2% of r 0.15% of range
2.5% of r 0.15% of range
8% of r 0.15% of range
0.5% of r 0.4% of range
0.4% of r 0.15% of range
1.2% of r 0.15% of range
2% of r 0.15% of range
6% of r 0.2% of range
16% of r 0.3% of range
If the fundamental frequency is between 1 kHz and 2.6 kHz, add 0.5% of reading to the voltage and
current accuracy and 1% of reading to the power accuracy when the frequency exceeds 1 kHz.
• When the line filter (50 kHz) is ON
Frequency
Voltage and Current
±(reading error + measurement
range error)
Power
±(reading error + measurement
range error)
10 Hz ≤ f < 30 Hz
30 Hz ≤ f ≤ 440 Hz
440 Hz < f ≤ 2.5 kHz
2.5 kHz < f ≤ 5 kHz
5 kHz < f ≤ 7.8 kHz
0.25% of r 0.3% of range
0.2% of r 0.15% of range
1% of r 0.15% of range
2% of r 0.15% of range
3.5% of r 0.15% of range
0.45% of r 0.4% of range
0.4% of r 0.15% of range
2% of r 0.2% of range
4% of r 0.2% of range
6% of r 0.2% of range
If the fundamental frequency is between 1 kHz and 2.6 kHz, add 0.5% of reading to the voltage and
current accuracy and 1% of reading to the power accuracy when the frequency exceeds 1 kHz.
• When the line filter is OFF
Frequency
Voltage and Current
±(reading error + measurement
range error)
Power
±(reading error + measurement
range error)
10 Hz ≤ f < 30 Hz
30 Hz ≤ f ≤ 440 Hz
440 Hz < f ≤ 2.5 kHz
2.5 kHz < f ≤ 5 kHz
5 kHz < f ≤ 7.8 kHz
0.15% of r 0.3% of range
0.1% of r 0.15% of range
0.6% of r 0.15% of range
1.6% of r 0.15% of range
2.5% of r 0.15% of range
0.25% of r 0.4% of range
0.2% of r 0.15% of range
1.2% of r 0.2% of range
3.2% of r 0.2% of range
5% of r 0.2% of range
If the fundamental frequency is between 1 kHz and 2.6 kHz, add 0.5% of reading to the voltage and
current accuracy and 1% of reading to the power accuracy when the frequency exceeds 1 kHz.
However, all the items below apply to all tables.
• When averaging is ON, the averaging type is EXP, and the attenuation constant is greater
than or equal to 8.
• When the crest factor is set to 3
• When λ (power factor) = 1
• Power exceeding 440 Hz are reference value.
• For external current sensor range, add 0.2 mV to the current accuracy and add (0.2 mV/
external current sensor range rating)×100% of range to the power accuracy.
• For direct current input range on the 30-A input element, add 0.2 mA to the current accuracy and
add (0.2 mA/direct current input range rating)×100% of range to the power accuracy.
• For direct current input range on the 2-A input element, add 2 µA to the current accuracy and
add (2 µA/direct current input range rating)×100% of range to the power accuracy.
• For n
th
order component input, add ({n/(m+1)}/50)% of (the n
th
order reading) to the n+m
th
order and n-m
th
order of the voltage and current, and add ({n/(m+1)}/25)% of (the n
th
order
reading) to the n+m
th
order and n-m
th
order of the power.
• Add (n/500)% of reading to the n
th
component of the voltage and current, and add (n/250)% of
reading to the n
th
component of the power.
• Accuracy when the crest factor is 6: The same as when the range is doubled for crest factor 3.
• The accuracy guaranteed range by frequency and voltage/current is the same as the
guaranteed range of normal measurement.
If the amplitude of the high frequency component is large, influence of approximately 1% may
appear in certain orders. The influence depends on the size of the frequency component.
Therefore, if the frequency component is small with respect to the range rating, this does not
cause a problem.
7.11 Harmonic Measurement Specifications
