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The
parameter defines the threshold voltage value used to detect an event
(pulse on the tachometer signal). Since the signal received by the Model 8220 can
be unipolar or bipolar, two types of threshold (0.3 and 1.1V) can be selected. The
recommended selection is as follows:
•
bipolar signals: 0.3V threshold
•
unipolar signals: 1.1V threshold
In both cases, the hysteresis is 0.2 V.
The value is set using the White and Yellow (
graphs for this hysteresis.
34
Display of the threshold voltage of the tachometer sensor.
Event
No event
0
Event
No event
0
0.1
Figure 4-8
0.2
0.9 1.1
Tachometer
signal (V)
0.2
0.3
Tachometer
signal (V)
Figure 4-9
Power Quality Analyzer Model 8220
) buttons. See below for the
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