13.4 Event Specifications
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Chapter 13 Specifications
Flag concept
IEC61000-4-30 flag concept
When a dip, swell, or interruption compromises the reliability of a value, a flag is attached to the measurement
data. Flags are referenced when determining the slide reference voltage and interruption frequency and
recorded along with TIMEPLOT data status information. Even when dip, swell, and interruption events have
been turned off, flags are attached to measurement data when a dip or interruption (when the voltage falls
10% relative to the nominal voltage) or swell (when the voltage rises 200%) is judged to have occurred. Flags
can be reviewed on the TIMEPLOT trend, detailed trend, and flicker (Pst, Plt) graphs. They are shown on
trend graphs and can also be reviewed with the measurement data using the 9624-50 PQA-HiView Pro soft-
ware.
Sense function
A SENSE START event occurs and sense starts when the upper or lower value is exceeded while sense
is on. While the sense function is operating, measured values are continuously compared to the range
defined by (the measured value when the event last occurred + the sense threshold) and (the measured
value when the event last occurred - the sense threshold). If the value falls outside this range, a sense
event is generated, and the sense range is updated. When the upper limit or lower limit exceeded event
ends, a SENSE END event is generated, and sense function operation terminates.
13.4 Event Specifications
Event detection
Event detection method • The detection method relative to measured values for each event target is listed in the measure-
ment specifications.
• External events are detected by detecting signal input to the external event (EVENT IN) terminal.
• Manual events are detected when the MANU EVENT key is pressed.
• Enabled measurement item events are detected using OR logic.
• Events cannot be detected using maximum, minimum, or average values.
• The threshold setting error is ±1 dgt. relative to the setting.
Event-synchronized save functionality
Event waveform Approx. 200 ms aggregation (10 cycle/12 cycle) + instantaneous waveforms for 2 cycles before
and after (20 kS/s) (for 400 Hz measurement, 80 cycles + 16 cycles before and after)
Transient waveform Instantaneous waveform for 2 ms before and after the transient overvoltage waveform detection
position (2 MS/s)
High-order harmonic waveform Instantaneous waveform for 40 ms following the first approx. 200 ms aggregation period in which
the reading is greater than the threshold (200 kS/s)
8,000 data points
Fluctuation data Display of RMS fluctuation data every half cycle equivalent to from 0.5 s before the event to 29.5 s
after event (for 400 Hz, measurement, from 0.125 s before to 7.375 s after) as a detailed trend graph
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