124
Power Quality Analyzer Model 8335
Four-Quadrant Diagram
This diagram is used as part of measuring power and energy (see § 5.6)
Mechanism for triggering transient sensors
The sample rate is a constant value equivalent to 256 samples per cycle. When
a transient search is launched, each sample is compared to the sample from the
preceding cycle. The preceding cycle matches the middle of the tube; it is used as
a reference. As soon as a sample leaves the tube, the trigger event comes; repre-
sentation of the transient is then captured by the PowerPad
®
. The cycle preceding
the event and the three following cycles are saved to memory.
Here is a graphical representation of the transient capture trigger mechanism:
0
1
2
3
4
5
Item
Function
1
Reference period
2
Top of envelope
3
Cycle monitored
4
Bottom of envelope
5
Triggering event
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