3.3 Integration
69
Integration precautions
(1) When integration starts with the 20 A fixed range, the voltage and current auto-range setting will be can-
celed, and measurement will be fixed to the range in effect when integration started. Set the range so
that the PEAK OVER U (overvoltage input alarm) lamp and PEAK OVER I (overcurrent input alarm)
lamp do not light up during integration.
If the PEAK OVER U lamp or PEAK OVER I lamp lights up during integration, the integrated value will
not be accurate. In this case, the Ah or Wh unit will flash until integrated values are reset (DATA RESET).
(Even if the current or active power measured value is [o.r] [over-range], measured values falling within
the range such that the PEAK OVER U and PEAK OVER I lamps do not light up will be integrated.)
(2) Equipment constraints due to the integration
Some parameters cannot be set or changed in the integration state (when the RUN lamp is lit up) or in
the integration stopped state (when the RUN lamp is flashing). If a change is not supported, [Err.12] will
be displayed for approximately 1 second.
See: Constraints during integration operation (p.144)
(3) If an integrated value reaches 999,999 MWh, or if the integration elapsed time reaches 10,000 hours,
integration will stop, and you will not be able to restart it. ([Err.14] will be displayed for approximately 1
second.) In this case, restart integration after pressing the followed by the to reset integrated
values (causing the RUN lamp to turn off).
See: "Canceling integration (resetting integrated values) (DATA RESET)" (p.65)
(4) Maximum value and minimum value measurement will also restart when integration starts. If an integra-
tion reset is performed, maximum value and minimum value measurement will also restart. Averaging
will also restart when integration is reset.
(5) When a system reset is performed, integration operation will stop, and the instrument will revert to its fac-
tory settings.
See: "3.9.4 Initializing the Instrument (System Reset)" (p.110)
(6) If the power goes out during integration, integration will stop. Integration will not resume when power to
the instrument is restored.
(7) If the timeout is set to 10 sec. and a signal of 1 Hz or less is input, a single measurement may take about
10 sec.
(8) Before starting integration synchronized measurement, reset integrated values on both the master and
slave. To perform a reset that is synchronized to the master, it is necessary for integration operation on
the slave to be in the stopped or reset state.
(9) Starting integration without first performing a reset results in additional integration.
(10) Synchronization- and external control-based integration cannot be mixed on the slave. Always terminate
external control and reset integration when performing synchronization-based integration.
(11) When the slave’s integration time setting is shorter than the master’s integration time setting, stop timing
cannot be synchronized since the slave’s integration will stop first.
(12) When performing synchronized measurement, once integration start/stop is performed on the slave, it
may not be possible to synchronize operation, even if the same operation is performed on the master.
(13) When performing integrated measurement using synchronized control, a difference of up to 0.7 sec. per
hour may occur between the master’s integration elapsed time display value (TIME) and the slave’s inte-
gration elapsed time display value.
Avoid using an uninterruptible power supply (UPS) or DC/AC inverter with rectangular wave
or pseudo-sine-wave output to power the instrument. Doing so may damage the instrument.
• When performing integration for an extended period of time, it is recommended to back up the instrument
with an uninterruptible power supply (UPS). The instrument’s maximum rated power is 30 VA or less.
Ensure that you use a UPS with adequate capacity.
• After power is restored, measured values may be offset for reasons related to the instrument’s internal cir-
cuitry. In this case, perform zero-adjustment after eliminating all input to the instrument, for example by
deactivating power to measurement lines.
• Continuing to input voltage or current signals after an outage has caused the instrument to lose power
may damage the instrument.
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