5.3 Measurement specifications
153
Temperature coefficient Voltage: ±0.03%f.s./°C or less
Current, active power: ±0.08%f.s./°C or less (instrument temperature coefficient; f.s.:
instrument measurement range)
Add current sensor temperature coefficient to above.
Effect of power factor Instrument: ±0.15%f.s. or less (45 to 66 Hz with power factor = 0)
Internal circuit voltage/current phase difference: ±0.0859°
Add the current sensor phase accuracy to the internal circuit voltage/current phase dif-
ference noted above.
Current waveform peak
value measurement speci-
fications
External current sensor input-specific specifications only
Measurement accuracy
±2.0% at DC or 10 Hz f 1 kHz (f.s.: current peak range)
Reference value given for 0.1 Hz f < 10 Hz and 1 kHz < f.
Add the current sensor accuracy to the above.
Measurement range
Effective measuring range
±5% to ±100% of current peak range
However, when using the 5 A range noted on the panel for TYPE.2, the upper limit is
±66.666% of the current peak range (±400% of the current range).
Harmonic measurement
accuracy
External current sensor input instrument measurement accuracy only
• Values for f.s. depend on measurement ranges.
• To obtain the current or active power accuracy, add the current sensor’s accuracy to
the above current and active power accuracy figures.
• When using the CT6841/CT6843, add ±2 mV to the CT6841/CT6843 accuracy after
performing CT6841/CT6843 zero adjustment using the 1 A range noted on the
panel.
Current range noted on panel 1 A 2 A 5 A
Current range 1 A × CT ratio 2 A × CT ratio 5 A × CT ratio
Current peak range (1 A × CT ratio) × 6 (2 A × CT ratio) × 6 (5 A × CT ratio) × 6
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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