Appendix 4 Recording TIMEPLOT Data and Event Waveforms
A
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Instruments defined under IEC61000-4-30 Class A must generate measurement results within the stipu-
lated accuracy range when measuring the same signal, even if different instruments are used to make the
measurement.
A series of 150/180 cycle time intervals is resynchronized every 10 minutes as shown in the figure to
align measurement times and measured values. Consequently, the approx. 200 ms aggregations (10 or
12 cycles) are also resynchronized every 10 minutes.
A new 150/180 cycle time interval starts every 10 minutes (for example, x+1), while measurement of the
existing 150/180 cycle time interval (for example, x) continues until it is complete. In this way, there is an
overlap between the two 150/180 cycle time intervals and between approx. 200 ms aggregations (10 or
12 cycles). The PW3198 synchronizes the start of the set TIMEPLOT interval every 10 minutes. For this
reason, approx. 200 ms aggregations (10 or 12 cycles) are also resynchronized every 10 minutes.
A new TIMEPLOT interval starts every 10 minutes, while measurement of the existing TIMEPLOT interval
continues until it is complete. In this way, there is an overlap between the two TIMEPLOT intervals.
To perform standard-compliant measurement, the TIMEPLOT interval must be set to 50 Hz/150 waves or
60 Hz/180 waves.
TIMEPLOT time synchronization and overlap
Figure. Synchronization Required by IEC61000-4-30 Class A
Figure. PW3198 Synchronization
Note: 10/12 cycles = 200 ms aggregation
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