5-12
IM WT310E-01EN
Data Correction When the Auto Range Feature Switches the
Range
Measurement does not take place while the range is being switched by the auto range feature. After
the measurement range is determined, the first measured data for the period of time over which
measurement did not take place is added to the integrated value.
• When the Range Is Increased
Each time the range is increased, up to three of the first items of data measured after the
determination of the measurement range is added to the integrated value immediately before the
conditions for increasing the range were met.
• When the Range Is Decreased
Each time the range is decreased, up to two of the first items of data measured after the
determination of the measurement range is added to the integrated value immediately before the
conditions for reducing the range were met.
Checking Whether the Range Has Been Changed by the Auto
Range Feature
During integration, when the measurement range is changed by the auto range feature, a hyphen is
added to the measurement range information that is output through communication.
Computation of the Integrated Value When the Measured Value
Exceeds the Measurement Limit (for Fixed Ranges)
When the sampled instantaneous voltage or current value exceeds approximately 333% (approximately
666% when the crest factor is set to 6 or 6A) of the measurement range, the value is processed as
if it were approximately 333% (approximately 666% when the crest factor is set to 6 or 6A) of the
measurement range.
Integration When the Applied Current Is Small
When the measurement mode is RMS or VOLTAGE MEAN and the applied current is less than or
equal to 0.5% (1% when the crest factor is set to 6 or 6A) of the rated range, integration takes place as
if the current value were zero.
Valid Frequency Ranges for Integration
The sample rate is approximately 100 kHz. The voltage and current signal frequencies that are valid
for integration are indicated below.
Integrated Item
Valid Frequency Range for Integration
Active power
DC to 45 kHz
Current
When the measurement mode is RMS
DC or the lower frequency limit determined by the data update
interval to approximately 45 kHz
When the measurement mode is
VOLTAGE MEAN
DC or the lower frequency limit determined by the data update
interval to approximately 45 kHz
When the measurement mode is DC
DC to 45 kHz
5.4 Notes about Using Integration
