MI 2893 / MI 2892 / MI 2885 Measurement methods
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5.1.17 Flagged data
Standard compliance: IEC 61000-4-30 Class A (Section 4.7)
During a dip, swell, or interruption, the measurement algorithm for other parameters (for
example, frequency measurement) might produce an unreliable value. The flagging concept avoids
counting a single event more than once in different parameters (for example, counting a single dip as
both a dip and a voltage variation), and indicates that an aggregated value might be unreliable.
Flagging is only triggered by dips, swells, and interruptions. The detection of dips and swells is
dependent on the threshold selected by the user, and this selection will influence which data are
"flagged".
10-min interval (n-1) 10-min interval (n) 10-min interval (n+1)
Dip
Voltage
Flagged Interval
Figure 167: Flagging data indicate that aggregated value might be unreliable
5.1.18 Waveform snapshot
During measurement campaign MI 2893/MI 2892/MI 2885 have the ability to take waveform snapshot.
This is particularly useful for storing temporary characteristics or network behaviour. Snapshot stores all
network signatures and waveform samples for 10/12 cycles. Using MEMORY LIST function (see 3.19) or
with PowerView v3.0 software, user can observe stored data. Waveform snapshot is captured by
starting GENERAL recorder or by pressing for 3 seconds in any of MEASUREMENTS sub
screens.
Long press on triggers WAVEFORM SNAPSHOT. Instrument will record all
measured parameters into file.
Note: WAVEFORM SNAPSHOT is automatically created at the start and end of GENERAL RECORDER.
5.1.19 Waveform recorder
Waveform recorder can be used in order to capture waveform of particular network event: such as
voltage event, inrush or alarm. In waveform record samples of voltage and current are stored for given
duration. Waveform recorder starts when the pre-set trigger occurs. Storage buffer is divided into pre-
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