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34
Power Quality Analyzer Model 3945-B
A programmed alarm must be set to “ON” to function properly (general acti-
vation or deactivation of alarms is generated in the alarm mode).
Modifying one or several characteristics of an alarm set to “ON”, automati-
cally switches it to “OFF”.
HysteresisPercentage(1,2,5or10%).Ahysteresisvalueissettoprevent
multiple recordings of an event that goes above the threshold and a certain
percentage below it at times. Example: Alarm threshold is 100 Volts or higher,
hysteresis is 1%. When voltage goes up to 100V, the alarm condition starts,
whenitnextgoesbackdownto99V,thealarmconditionstops.
Alarmactivation(ONorOFF)
Alarmnumber(1to10)
Thereare24parameterstochoosefromforalarmtriggering.Theyare:Vrms,
Urms, Arms, Vpst, Vcf, Ucf, Acf, Vumb, Aumb, Hz, Akf, Vthd, Uthd, Athd, W,
VAR, VA, DPF, PF, Tan, Vh, Uh, Ah and VAh.
Threshold value for triggering an alarm
Minimum duration from beginning threshold detection to store the alarm
(from0.01secondsto99minutes)
Lessthan“<”orgreaterthan“>”
Capture -3L:captureallphases(1,2,or3dependingonhookupselection)
-N:neutralcapture
- Σ:totalpowercapture
- Σ/3:averagevalueof3-phasecapture(Σ/2for2-phase)
- 0-50 harmonic order available for harmonic event capture
Alarm Programming
Choose the parameters associated with an alarm from the available parame-
ters(phasessurvey,thresholdvalueandminimumdurationlteringcanbepro-
grammed).
NOTE: The programmed hysteresis is common to all alarms.
• Highlight Alarm with the
buttons, then press the button.
• Selectthemodiableeldusingthe
buttons.
• Activate or adjust the threshold values using the
buttons.(Theeldtobe
modiedisshowninbold.)
• Press the
buttonwhenyouhavenishedsettingallthealarmparameters.
NOTE: When the alarm is “OFF”, the parameters previously used are stored in
memory and reappear if the alarm is selected again.