5.3 Measurement specifications
147
Harmonic Measurement Specifications
Measurement method Zero-cross simultaneous calculation method
Uniform thinning between zero-cross events after processing with a digital antialiasing
filter
Interpolation calculations (Lagrange interpolation)
When the synchronization frequency falls within the 45 Hz to 66 Hz range
IEC 61000-4-7:2002 compliant
Gaps and overlaps may occur if the measurement frequency is not 50 Hz or 60 Hz.
When the synchronization frequency falls outside the 45 Hz to 66 Hz range
No gaps or overlap will occur.
Synchronization source Conforms to synchronization source (SYNC) for the basic measurement specifications.
Measurement items Harmonic voltage RMS value, harmonic voltage content percentage, harmonic voltage
phase angle, harmonic current RMS value, harmonic current content percentage, har-
monic current phase angle, harmonic active power, harmonic active power content per-
centage, harmonic voltage current phase difference, total harmonic voltage distortion,
total harmonic current distortion, fundamental wave voltage, fundamental wave current,
fundamental wave active power, fundamental wave apparent power, fundamental wave
reactive power, fundamental wave power factor, fundamental wave voltage current
phase difference
(The following parameters can be downloaded as data with communications but not dis-
played:)
Harmonic voltage phase angle, harmonic current phase angle, harmonic voltage cur-
rent phase difference
FFT processing word length,
number of FFT points
32 bits,
4,096 points
Window function Rectangular
Analysis window width
Data update rate Depends on window width.
Maximum analysis order Synchronization frequency range: 10 Hz to 640 Hz
Analysis order upper limit
setting
2nd to 50th (default state: 50th)
Measurement accuracy f.s.: Measurement range
• When using the 1 mA/ 2 mA range
Add ±1 A to 10 Hz to 8 kHz measurement accuracy for current.
Add (±1 A) × (voltage read value) to 10 Hz to 8 kHz measurement accuracy for
active power.
• When using the 200 mA/ 500 mA/ 1 A/ 2 A/ 5 A/ 10 A/ 20 A range
Add ±1 mA to DC measurement accuracy for current.
Add (±1 mA) × (voltage read value) to DC measurement accuracy for active power.
• When using the 1 mA/ 2 mA/ 5 mA/ 10 mA/ 20 mA/ 50 mA/ 100 mA range
Add ±10 A to DC measurement accuracy for current.
Add (±10 A) × (voltage read value) to DC measurement accuracy for active power.
Frequency (f) Window width
45 Hz f < 56 Hz 178.57 ms to 222.22 ms (10 cycles)
56 Hz f < 66 Hz 181.82 ms to 214.29 ms (12 cycles)
Frequencies other than the above 185.92 ms to 214.08 ms
Synchronization frequency (f) range Analysis order
10 Hz f < 45 Hz 50th
45 Hz f < 56 Hz 50th
56 Hz f 66 Hz 50th
66 Hz < f 100 Hz 50th
100 Hz < f 200 Hz 40th
200 Hz < f 300 Hz 25th
300 Hz < f 500 Hz 15th
500 Hz < f 640 Hz 11th
Frequency (f) Voltage, Current, Active power
DC ±0.4% rdg. ±0.2%f.s.
10 Hz f < 30 Hz ±0.4% rdg. ±0.2%f.s.
30 Hz f 400 Hz ±0.3% rdg. ±0.1%f.s.
400 Hz < f 1 kHz ±0.4% rdg. ±0.2%f.s.
1 kHz < f 5 kHz ±1.0% rdg. ±0.5%f.s.
5 kHz < f 8 kHz ±4.0% rdg. ±1.0%f.s.
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