A14
Instruments defined under IEC61000-4-30 Class A must generate measurement results within the stipu-
lated accuracy range when measuring the same signal, eve
n if different instruments are used to make the
measurement.
A series of 150/180 cycle time intervals is resynchr
onized 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
existin
g 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 PQ3198 synchronizes the start of the set TIME PLOT interval every 10 minutes. For this
reason, approx. 200 ms aggregations (10 or 12 cycles) are also resynchronized every 10 minutes.
A new TIME PLOT interval starts every 10 minutes, while
measurement of the existing TIME PLOT inter-
val continues until it is com
plete. In this way, there is an overlap between the two TIME PLOT intervals.
To perform standard-c
ompliant measurement, the TIME PLOT interval must be set to 50 Hz/150 cycles or
60 Hz/180 cycles.
TIME PLOT time synchronization and overlap
Figure. Synchronization Required by IEC61000-4-30 Class A
Figure. PQ3198 Synchronization
Note: 10/12 cycles = 200 ms aggregation
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