Displayed Items - YOKOGAWA WT1800 User Manual

6.3

Displayed Items

Numeric Display
Measurement Functions Determined for Each Input Element
For details about how the measurement function values are computed and determined, see appendix 1.
Item
Voltage (V)
Current (A)
Active power (W)
Apparent power (VA)
Reactive power (var)
Power factor
Phase difference (°)
Frequency (Hz)
Voltage max. and min. (V)
Current max. and min. (A)
Power max. and min. (W)
Crest factor (peak-to-rms ratio)
Corrected power (W)
Integration
IM WT1801-03EN
Symbols and Meanings
Urms: true rms value, Umn: rectified mean value calibrated to the rms value, Udc: simple average,
Urmn: rectified mean value, Uac: AC component
Irms: true rms value, Imn: rectified mean value calibrated to the rms value, Idc: simple average, Irmn:
rectified mean value, Iac: AC component
P
S
Q
λ
Φ
fU (FreqU): voltage frequency, fI (FreqI): current frequency
You can simultaneously measure three frequencies from the frequencies fU and fI of all the
installed elements.
On models with the add-on frequency measurement option, the fU and fI of all elements can be
measured simultaneously.
For signals that are not selected, [--------] (no data) is displayed.
U+pk: maximum voltage, U-pk: minimum voltage
I+pk: maximum current, I-pk: minimum current
P+pk: maximum power, P-pk: minimum power
CfU: voltage crest factor, CfI: current crest factor
Pc
Applicable standards
IEC76-1 (1976), IEC76-1 (1993)
Time: integration time
WP: sum of positive and negative watt hours
WP+: sum of positive P (consumed watt hours)
WP-: sum of negative P (watt hours returned to the power supply)
q: sum of positive and negative ampere hours
q+: sum of positive I (ampere hours)
q-: sum of negative I (ampere hours)
WS: volt-ampere hours
WQ: var hours
By using the current mode setting, you can select to integrate the ampere hours using Irms, Imn,
Idc, Irmn, or Iac.
1
2
3
4
5
6
App
Index
6-3