9-11
IM WT3001E-51EN
IEC Harmonic Measurement (Option)
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Index
Item
Specifications
Accuracy
• When the line filter (5.5 kHz) is ON
Frequency
Voltage and Current
±(reading error + measurement
range error)
Power
±(reading error + measurement
range error)
45 Hz ≤ f ≤ 66 Hz
66 Hz<f ≤ 440 Hz
440 Hz<f ≤ 1 kHz
1 kHz<f ≤ 2.5 kHz
2.5 kHz<f ≤ 3.3 kHz
0.2% of r 0.04% of range
0.5% of r 0.05% of range
1% of r 0.05% of range
2.5% of r 0.05% of range
8% of r 0.05% of range
0.4% of r 0.05% of range
1.2% of r 0.1% of range
2% of r 0.1% of range
5% of r 0.15% of range
16% of r 0.15% of range
However, all the items below apply.
• When the crest factor is set to 3
• When λ (power factor) = 1
• Power figures that exceed 440 Hz are reference values.
• For external current sensor range, add 0.03 mV to the current accuracy and add (0.03 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 (0.1 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 (1 µA/direct current input range
rating)×100% of range to the power accuracy.
• For direct current input in a range less than or equal to 200 mA on the 2-A input element, add
0.02% of r 0.01% of range to the current accuracy in the range of 45 Hz ≤ f ≤ 66 Hz
and add 0.03% of r 0.01% 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 (only when applying a single
frequency).
• 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.
9.6 IEC Harmonic Measurement Specifications