YOKOGAWA WT1800 User Manual page 97

Item
Accuracy
The items listed below apply to the tables in this section.
• The crest factor is set to 3.
• λ (the power factor) is 1.
• Power figures that exceed 2.6 kHz are reference values.
• Add the following values when a voltage range is being used:
Voltage accuracy: 25 mV
Power accuracy: (25 mV/rated voltage range) × 100% of range
• Add the following values when direct current input is being used:
5 A elements:
Current accuracy: 50 μA
Power accuracy: (50 μA/rated current range) × 100% of range
50 A elements:
Current accuracy: 4 mA
Power accuracy: (4 mA/rated current range) × 100% of range
• Add the following values when an external current sensor range is being used:
Current accuracy: 2 mV
Power accuracy: (2 mV/rated external current sensor range) × 100% of range
• Add (n/500)% of reading to the n
power.
• The accuracy when the crest factor is 6 is the same as the accuracy when the crest factor is 3 after doubling the measurement
range.
• The guaranteed accuracy ranges for frequency, voltage, and current, are the same as the guaranteed ranges for normal
measurement.
• The neighboring harmonic orders may be affected by the side lobes from the input harmonic order.
• When the frequency of the PLL source is 2 Hz or greater, for n
reading) to the n + m th order and n − m
the n + m th order and n − m th
• When the frequency of the PLL source is less than 2 Hz, for n
th
reading) to the n + m order and n − m
th th
the n + m order and n − m
IM WT1801-03EN
Specifications
Add the following accuracy values to the normal measurement accuracy values.
• When line filters are turned off
Frequency Voltage
0.5 Hz ≤ f < 10 Hz 0.05% of reading
+ 0.25% of range
10 Hz ≤ f < 45 Hz 0.05% of reading
+ 0.25% of range
45 Hz ≤ f ≤ 66 Hz 0.05% of reading
+ 0.25% of range
66 Hz < f ≤ 440 Hz 0.05% of reading
+ 0.25% of range
440 Hz < f ≤ 1 kHz 0.05% of reading
+ 0.25% of range
1 kHz < f ≤ 10 kHz 0.5% of reading
+ 0.25% of range
10 kHz < f ≤ 100 kHz 0.5% of range
100 kHz < f ≤ 260 kHz 1% of range
• When line filters are turned on
Add the line filter accuracy values to the accuracy values when the line filters are turned off.
th
component of the voltage and current. Add (n/250)% of reading to the n
th order of the voltage and current, and add ({n/(m + 1)}/25)% of (the n
order of the power.
th
order of the voltage and current, and add ({n/(m + 1)}/10)% of (the n
order of the power.
6.6 Harmonic Measurement (Option)
Current
0.05% of reading
+ 0.25% of range
0.05% of reading
+ 0.25% of range
0.05% of reading
+ 0.25% of range
0.05% of reading
+ 0.25% of range
0.05% of reading
+ 0.25% of range
0.5% of reading
+ 0.25% of range
0.5% of range
1% of range
th order component input, add ({n/(m + 1)}/50)% of (the n
th order component input, add ({n/(m + 1)}/20)% of (the n
Power
0.1% of reading
+ 0.5% of range
0.1% of reading
+ 0.5% of range
0.1% of reading
+ 0.5% of range
0.1% of reading
+ 0.5% of range
0.1% of reading
+ 0.5% of range
1% of reading
+ 0.5% of range
1% of range
2% of range
App
Index
th
component of the
th order
th order reading) to
th order
th
order reading) to
6-13
1
2
3
4
5
6