14-3
IM WT5000-01EN
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 (10000 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
This instrument determines and displays the integrated value by summing the value that is measured at every
data update interval, irrespective of the
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
If rounding to zero is on, when the current input meets the following conditions relative to the measurement
range, integration is performed assuming the current to be zero.
• 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 or CF6A
When Irms or Iac is 1.0% or less. When Imn or Irmn is 4% or less.
Sample Rate, and Valid Frequency Ranges for Integration
The sample rate is approximately 5 MHz. The voltage/current signal frequencies that are valid for integration are
as follows:
Integrated Item
Valid Frequency Range for Integration
Active power
DC to approx. 2.5 MHz
Current
When integrating Irms DC or the lower frequency limit determined by the data
update interval to approximately 2.5 MHz
When integrating Imn DC or the lower frequency limit determined by the data
update interval to approximately 2.5 MHz
When integrating Idc
DC to approx. 2.5 MHz
When integrating Irmn DC or the lower frequency limit determined by the data
update interval to approximately 2.5 MHz
When integrating Iac
The lower frequency limit determined by the data update
interval to approximately 2.5 MHz
Using an External Signal to Control Integration (Option)
On models with the 20-channel D/A output option, you can use the remote control feature to use an external
signal to start, stop, and reset integration. For details about the remote control feature, see section 4.5 in the
Getting Started Guide, IM WT5000-03EN.
14 Integrated Power (Watt Hours/Ampere Hours)
