Example of the Display When Independent Integration Is Enabled
Integration status
of each element
The integration status of the input
element or wiring unit selected with
the ELEMENT key for setting
ranges.
When a wiring unit is selected, the
element number at the top is the
number of the smallest input
element in the wiring unit.
Number of Displayed Digits (Display Resolution)
The number of displayed digits (display resolution) for an integrated value is six (the maximum value is 999999).
When an integrated value reaches 1000000 counts, the decimal point shifts automatically. For example, if 0.001
mWh is added to 999.999 mWh, the display shows 1.00000 Wh.
Maximum and Minimum Displayable Integrated Values
Active power (WP): ±999999 MWh
Current (q): ±999999 MAh
Apparent power (WS): ±999999 MVAh
Reactive power (WQ): ±999999 Mvarh
Display When Integration Overflow Occurs
If either of the conditions below is met, integration is stopped, and the integration time and integrated value are
held.
• The integration time reaches the maximum integration time (1
0000 hours).
• The integrated value of WP, q, WS, or WQ reaches the maximum or minimum displayable value given above.
Integration When the MAX Hold Feature Is Enabled
The WT1800 determines and displays the integrated value by summing the value that is measured at every data
update interval, irrespective of the MAX hold feature.
Integration When the Measured Value Exceeds the Measurement Limit
If a sampled instantaneous current or voltage exceeds the maximum or minimum measurement range limits of
the AD circuit, the value is measured as the maximum or minimum measurement range limit value.
Integration When Current Input Is Small
Integration is performed assuming a current of zero when the current input relative to the measurement range is
as indicated below.
• When the Crest Factor Is Set to CF3
When Irms or Iac is 0.5% or less When Imn or Irmn is 2% or less
•
When the Crest Factor Is Set to CF6
When Irms or Iac is 1.0% or less When Imn or Irmn is 4% or less
9 Integrated Power (Watt hours)
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