User Manual

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Figure 111: Four-quadrant diagram
16.6. MECHANISM FOR TRIGGERING TRANSIENT CAPTURES
For the C.A 8333 only.
The sampling rate is a constant 256 samples per cycle. When a transient capture is started, each sample is compared to the
sample from the preceding cycle. The preceding cycle defines the mid-point of a virtual tube and is used as reference. As soon
as a sample is outside the envelope, it is treated as a triggering event; the representation of the transient is then captured by the
device. The cycle preceding the event and the three following cycles are saved to memory.
Here is a graphic representation of the transient capture triggering mechanism:
Reference period (preceding the
period monitored)
Top of virtual reference envelope
Cycle monitored
Bottom of virtual reference envelope
Triggering event
0
The half-width of the virtual envelope for the voltage and current is equal to the threshold programmed in the Transient mode of
the configuration (see §4.8).
16.5. FOUR-QUADRANT DIAGRAM
This diagram is used for power and energy measurements (see §9).