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12-3
IM 760301-01E
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App
Index
Specifications
12.3 Measurement Functions (Measurement Items)
Related to Normal Measurement
Measurement Functions Determined for Each Input Element
For details on the determination and equations of measurement functions, see appendix 1.
Item Symbol and Meaning
Voltage (V) Urms: true rms value, Umn: rectified mean value calibrated to the rms value, Udc: simple average,
Urmn: rectified mean value
Current (A) Irms: true rms value, Imn: rectified mean value calibrated to the rms value, Idc: simple average,
Irmn: rectified mean value
Active power (W) P
Apparent power (VA) S
Reactive power (var) Q
Power factor λ
Phase difference ( ° ) φ
Frequency (Hz) fU (FreqU): voltage frequency, fI (FreqI): current frequency
Two frequencies from the fU and fI of all installed elements can be measured simultaneously. On
the model with the frequency measurement add-on option, the fU and fI of all elements can be
measured simultaneously. The display of signals that are not selected shows [--------] (no data).
Voltage max. and min. (V) U+pk: Voltage maximum, U-pk : Voltage minimum
Current max. and min. (A) I+pk: Current maximum, I-pk : Current minimum
Crest factor CfU: Voltage crest factor, CfI : Current crest factor
Corrected Power (W) Pc
(Applicable standard IEC76-1(1976), IEEE C57.12.90-1993, IEC76-1(1993))
Integration Time: Integration time
WP: Sum of positive and negative watt hours
WP+: Sum of positive P (consumed watt hour)
WP-: Sum of negative P (watt hour returned to the power supply)
q:
Sum of positive and negative ampere hours
q+: Sum of positive I (ampere hour)
q-: Sum of negative I (ampere hour)
WS: Volt-ampere-hour
WQ: Var-hour
However, the ampere hour is integrated by selecting Irms, Imn, Idc, or Irmn through the current
mode setting.