12.2 Measurement Specifications
192
Harmonic Voltage/Current Phase Difference (including fundamental wave components)
Measurement method
After harmonic analysis, the difference between harmonic voltage and cur-
rent phase angles is displayed
Display items
Harmonic voltage-current phase difference for each channel and sum (total)
value for multiple channels
(For details, see the formula.(page 209))
Measurement accuracy
At 50/60 Hz:
1st to 3rd orders: ±2°, 4th to 50th orders: ±(0.02°
×
k+2°) (k: harmonic or-
ders)
At 400 Hz:
1st to 10th orders: ±(016°
×
k+2°) (k: harmonic orders)
However, clamp sensor accuracy is added.
Accuracy range
Harmonic voltage and current level for each order within 1% of the range.
Total Harmonic Voltage/Current Distortion Factor
Measurement display
THD-F (total harmonic distortion factor for the fundamental wave)
THD-R (total harmonic distortion factor for the total harmonic including the
fundamental wave)
Total Inter-harmonic Voltage/Current Distortion Factor
Measurement display
THD-F (total inter-harmonic distortion factor for the fundamental wave)
THD-R (total
inter-harmonic
distortion factor for the total harmonic including
the fundamental wave)
Other Characteristics
Frequency characteristic
69 Hz to 1 kHz: ±3% f.s.
1 kHz to 3 kHz: ±10% f.s. (RMS voltage, RMS current), ±15% f.s. (active
power)
Temperature characteristic
AC: At 50/60 Hz measurement, within ±0.03% f.s./°C
At 400 Hz measurement, within ±0.05% f.s./
°C
(from 0 to 18°C and from 28 to 40°C)
DC: Within ±0.1% f.s./°C (from 0 to 18°C and from 28 to 40°C)
Effect of common mode
voltage
±0.2% f.s. or less (600 Vrms, 50/60 Hz, between voltage input terminal and
instrument case)
±2% f.s. or less (600 Vrms, 400 Hz, between voltage input terminal and in-
strument 1/4
×3/4)
Effect of external magnetic
field
±1.5% f.s. or less (in a magnetic field of 400 A/m rms, 50/60 Hz)
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