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16.2 Accuracy
Active Power Accuracy
Item
Accuracy
Influence of power factor
Effect when the line filter
is turned ON
Temperature coefficient
Accuracy 12 months
after calibration
Accuracy when the crest
factor is set to 6
Accuracy of Other Parameters and Computation Accuracy
16-4
Specifications
Requirements
Same as the conditions for voltage and current.
Accuracy (3 months after calibration)
Frequency
DC
0.5 Hz ≤ f < 45 Hz
45 Hz ≤ f ≤ 66 Hz
66 Hz < f ≤ 1 kHz
1 kHz < f ≤ 10 kHz
10 kHz < f ≤ 100 kHz
Add ±10 µA × voltage reading to the DC accuracy of power.
When power factor (PF) = 0(VA: apparent power)
±0.2% of VA for 45 Hz ≤ f ≤ 66 Hz.
•
±{(0.2 + 0.2 × f)% of VA} for up to 100 kHz as reference data. The unit for frequency f is kHz.
•
When 0 < PF < 1 (φ: phase angle of the voltage and current)
Add the power reading × {tanφ × (influence when PF = 0)}%.
45 to 66 Hz: Add 0.3% of reading. Less than 45 Hz: Add 1% of reading.
Same as the temperature coefficient for voltage and current.
Add ±(reading error of the accuracy at 3 months after calibration × 0.5)
Accuracy obtained by doubling the measurement range error for the accuracy when the crest factor
is set to 3.
•
For the accuracy of frequency voltage and current, see "Frequency Measurement" in section
16.3, "Functions."
•
For the accuracy of integrated values Wh, Wh+, Wh-, Ah, Ah+, and Ah- and the integration timer,
see "Integration" in section 16.3, "Functions."
•
For the accuracy of voltage, current and power during harmonic measurement, see "Harmonic
Measurement" in section 16.3, "Functions."
•
For the D/A output accuracy, see section 16.5, "D/A Output."
Accuracy
(The accuracy shown below is the sum of reading and range errors.)
±(0.3% of reading + 0.2% of range)
±(0.3% of reading + 0.2% of range)
±(0.1% of reading + 0.1 % of range)
±(0.2% of reading + 0.2 % of range)
±(0.1% of reading + 0.3 % of range) ± [{0.067 × (f – 1)}% of reading]
±(0.5 % of reading + 0.5 % of range) ± [{0.09 × (f – 10)}% of reading]
* The unit of f in the read error equation is kHz.
IM 760401-01E
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