Power Quality Analyzer Model 3945-B
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6.5.3 Alarm Conditions Configuration
The Alarm Conditions window allows you to set up 10 alarm configurations.
Figure 6-8
• Hysteresis:
This value for alarms is set to prevent multiple recordings of an
event that goes above the threshold and a certain percentage below it at
times.
Example:
If the alarm threshold is 100 Volts or higher, hysteresis is 1%. When the
voltage goes up to 100V, the alarm condition starts. When it goes back down to 99V,
the alarm condition stops.
• Disable All Alarms:
When this box is checked, all alarms will be disabled even
if the individual alarm enable box is checked.
Make sure this is not checked
if you want to record alarms.
Alarm Conditions
• Enabled:
When check box is checked, alarm is enabled.
• Harmonic Number:
For alarm parameters, Vh, Ah, Uh, and VAh, selects
which harmonic number is being used as an alarm condition. For exam-
ple, Vh with a harmonic number of 2, will only look at Voltage phase to
neutral, harmonic 2.