User Manual

12.2 Measurement Specifications
186
Active Power
Measurement method
Waveform consists of 256 points/cycle, measured every 12 or 10 cycles at
50 or 60 Hz, respectively (approx. 200 ms)
Calculated by averaging sampled voltage and current waveform data
Display items
Active power of each channel and its sum for multiple channels. (For details,
see the formula.(page 198))
Measurement range
Depends on the voltage
×
current range combination. (See the power range
configuration table (page 190).)
Measurement accuracy
±0.2% rdg. ±0.1% f.s. + clamp sensor specification accuracy (power factor
= 1)(The total is the sum of the channels used.)
Power factor influence
±1.0% rdg. (45 Hz to 66 Hz, power factor = 0.5)
Polarity display
For influx (consumption) No symbol
For outflow (regenerative) "-"
Apparent Power
Measurement method
Calculated from RMS voltage U and RMS current I.
Display item
Apparent power of each channel and its sum for multiple channels. (For de-
tails, see the formula.(page 198))
Measurement range
Depends on the voltage x current range combination. (See the power range
configuration table (page 190).)
Measurement accuracy
±1 dgt. for calculations derived from the various measurement values. (sum
is ±3 dgt.)
Polarity display
No polarity
Reactive Power
Measurement method
Calculated using apparent power S and active power P.
Display item
Reactive power of each channel and its sum for multiple channels. (For de-
tails, see the formula.(page 199))
Measurement range
Depends on the voltage x current range combination. (See the power range
configuration table (page 190).)
Measurement accuracy
±1 dgt. for calculations derived from the various measurement values. (sum
is ±3 dgt.)
Polarity display
For phase lag (LAG: current is slower than voltage): no symbol
For lead phase (LEAD: current is faster than voltage): “-”
Power Factor
Measurement method
Calculated from RMS voltage U, RMS current I, and active power P.
Display item
Power factor of each channel or its sum for multiple channels. (For details,
see the formula.(page 199))
Measurement range
-1.000 (lead) to 0.000 to +1.000 (lag)
Measurement accuracy
±1 dgt. for calculations derived from the various measurement values. (sum
value is ±3 dgt.)
Polarity display
For phase lag (LAG: current is slower than voltage): no symbol
For lead phase (LEAD: current is faster than voltage):”-”