3.3 Integration
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The instrument performs integration for the current and active power in the positive direction (Ah+, Wh+), in the
negative direction (Ah-, Wh-), and as sums (Ah, Wh) simultaneously and can display the integrated value for
each. Integration can be started and stopped, and the integrated value can be reset, using either the instrument’s
keys or the external control function. Additionally, by setting the integration time, it is possible to perform timer
integration in 1-minute units from 1 minute to 10,000 hours (approximately 417 days). Furthermore, it is also pos-
sible to display the time average current and time average active power as calculated from the integrated value
at that point in time and the integration elapsed time while integration is being performed.
Measured values are integrated as valid data while they fall within the effective measurement range for inte-
gration; that is, the integration operation maintains until a peak of measurement values reaches the maximum
effective peak voltage or maximum effective peak current (until the PEAK OVER U or PEAK OVER I lamp
lights up).
Maximum effective peak voltage: ±600% of the voltage range (up to ±1,500 V peak for the 300 V, 600 V,
and 1,000 V ranges)
Maximum effective peak current: ±600% of the current range (up to ±100 A peak for the 20 A range)
Example: When performing DC current integration using the 1 A range, the current display value (A) will change
to [o.r] when 1.52 A is exceeded, but the effective measurement range for current integration (Ah)
extends from ±10 mA (1% of the 1 A range) to ±6 A, so the values will be integrated as valid data.
Display parameters and descriptions related to integration
Displaying the rectifier and integrated values
Internally, the following integrated values are all integrated simultaneously, regardless of the rectifier. Conse-
quently, integrated value data with simultaneity can be obtained simply by switching the display parameter.
Display parameter Description
Ah + Positive current integrated value
Ah - Negative current integrated value
Ah Sum of current integrated values
Wh + Positive active power integrated value
Wh - Negative active power integrated value
Wh Sum of active power integrated values
TIME Integration elapsed time
T.AV A Time average current (obtained by dividing the sum of current integrated values by the integra-
tion elapsed time)
T.AV W Time average active power (obtained by dividing the sum of active power integrated values by
the integration elapsed time)
Current (Ah+, Ah-, Ah)
Rectifier Integration operation and display
AC+DC
AC+DC Umn
The results of integrating current RMS value data (display values) once every display update
interval (200 ms) are displayed as integrated values.
DC The results of integrating sampled instantaneous data separately by polarity are displayed as
integrated values.
AC, FND [
- - - - -] (no integrated data) is shown.
Active power (Wh +, Wh -, Wh)
Rectifier Integration operation and display
AC+DC
AC+DC Umn
The results of integrating active power values calculated once for every cycle of the selected
synchronization source separately by polarity are displayed as integrated values. This rectifier
is used to integrate active power values of cyclic waveforms.
DC The results of integrating sampled instantaneous data separately by polarity are displayed as
integrated values. This rectifier is used to integrate active power values of non-cyclic wave-
forms such as a DC or others. (When a waveform to be measured includes both a DC and an
AC component, the integrated value will not be an integration of only a DC component.)
AC, FND [
- - - - -] (no integrated data) is shown.
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