Fluke 1736/FPC User Manual page 50

Supply Voltage Swells
On single-phase systems, a swell begins when the voltage rises
above the swell threshold, and ends when the voltage is equal to or
below the swell threshold minus the hysteresis voltage. See Figure 7.
On polyphase systems, a swell begins when the voltage of one or
more channels is above the swell threshold and ends when the
voltage on all measured channels is equal to or below the swell
threshold minus the hysteresis voltage.
Threshold
Hysteresis
Reference Voltage
Figure 7. Characteristics of a Voltage Swell
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Magnitude
Duration
Time
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On single-phase systems, a voltage dip begins when the voltage falls
below the dip threshold, and ends when the voltage is equal to or
above the dip threshold plus the hysteresis voltage. See Figure 8.
Reference Voltage
Hysteresis
Threshold
Figure 8. Characteristics of a Voltage Dip
On polyphase systems, a dip begins when the voltage of one or more
channels is below the dip threshold and ends when the voltage on all
measured channels is equal to or above the dip threshold plus the
hysteresis voltage.
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Power Logger
Function Selection Buttons
Duration
Time
Magnitude
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