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Accuracy
IM WT3001E-51EN
8.5 Wide Bandwidth Harmonic Measurement Specifications
Specifications
• When the line filter (5.5 kHz) is ON
Frequency
Voltage and Current
±(reading error + measurement
range error)
0.1 Hz ≤ f < 10 Hz
0.25% of reading + 0.3% of range
10 Hz ≤ f < 30 Hz
0.25% of reading + 0.3% of range
30 Hz ≤ f ≤ 66 Hz
0.3% of reading + 0.05% of range
66 Hz < f ≤ 440 Hz
0.6% of reading + 0.05% of range
440 Hz < f ≤ 1 kHz
1% of reading + 0.05% of range
1 kHz < f ≤ 2.5 kHz
2.5% of reading + 0.05% of range
2.5 kHz < f ≤ 3.5 kHz
8% of reading + 0.05% 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 for frequencies greater than 1 kHz.
Add 1% of reading to the power accuracy for frequencies greater than 1 kHz.
• When the line filter (50 kHz) is ON
Frequency
Voltage and Current
±(reading error + measurement
range error)
0.1 Hz ≤ f < 10 Hz
0.25% of reading + 0.3% of range
10 Hz ≤ f < 30 Hz
0.25% of reading + 0.3% of range
30 Hz ≤ f ≤ 440 Hz
0.3% of reading + 0.05% of range
440 Hz < f ≤ 1 kHz
0.7% of reading + 0.05% of range
1 kHz < f ≤ 5 kHz
0.7% of reading + 0.05% of range
5 kHz < f ≤ 10 kHz
3.0% of reading + 0.05% 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 for frequencies greater than 1 kHz.
Add 1% of reading to the power accuracy for frequencies greater than 1 kHz.
• When the line filter is OFF
Frequency
Voltage and Current
±(reading error + measurement
range error)
0.1 Hz ≤ f < 10 Hz
0.15% of reading + 0.3% of range
10 Hz ≤ f < 30 Hz
0.15% of reading + 0.3% of range
30 Hz ≤ f ≤ 1 kHz
0.1% of reading + 0.05% of range
1 kHz < f ≤ 10 kHz
0.3% of reading + 0.05% of range
10 kHz < f ≤ 55 kHz
1% of reading + 0.2% of range
•
If the fundamental frequency is between 400 Hz and 1 kHz
Add 1.5% of reading to the voltage and current accuracy for frequencies greater than 10 kHz.
Add 3% of reading to the power accuracy for frequencies greater than 10 kHz.
•
If the fundamental frequency is between 1 kHz and 2.6 kHz
Add 0.5% of reading to the voltage and current accuracy for frequencies greater than 1 kHz
and less than or equal to 10 kHz.
Add 7% of reading to the voltage and current accuracy for frequencies greater than 10 kHz.
Add 1% of reading to the power accuracy for frequencies greater than 1 kHz and less than
equal to 10 kHz.
Add 14% of reading to the power accuracy for frequencies greater than 10 kHz.
However, all the items below apply to all tables.
•
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 0.2 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.
th
•
For n
order component input, add ({n/(m+1)}/50)% of (the n
order and n-m
th
order of the voltage and current, and add ({n/(m+1)}/25)% of (the n
th
reading) to the n+m
order and n-m
•
Add (n/500)% of reading to the n
th
reading to the n
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.
Power
±(reading error + measurement
range error)
0.5% of reading + 0.4% of range
0.5% of reading + 0.4% of range
0.45% of reading + 0.1% of range
1.2% of reading + 0.1% of range
2% of reading + 0.1% of range
5% of reading + 0.15% of range
16% of reading + 0.15% of range
Power
±(reading error + measurement
range error)
0.45% of reading + 0.4% of range
0.45% of reading + 0.4% of range
0.45% of reading + 0.1% of range
1.4% of reading + 0.1% of range
1.4% of reading + 0.15% of range
6% of reading + 0.15% of range
Power
±(reading error + measurement
range error)
0.25% of reading + 0.4% of range
0.25% of reading + 0.4% of range
0.2% of reading + 0.1% of range
0.6% of reading + 0.15% of range
2% of reading + 0.4% of range
th
order reading) to the n+m
th
order of the power.
th
component of the voltage and current, and add (n/250)% of
1
2
3
4
5
6
7
8
9
10
11
12
13
th
th
order
Index
8-7
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