Inrush Current - Fluke 43B Getting Started Manual

Getting Started
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Sags & Swells
Sags and swells measures fast deviations
(from one cycle to a few seconds) from the
normal voltage signal, and displays current
simultaneously.
The results are plotted on the screen as a
graph. The graph shows the minimum and
maximum values at each point of the graph.
&
The SAGS SWELLS function is particularly
useful to record flicker.
SAG
Transients
Transients are fast spikes on the voltage (or current) signal. Spikes may
contain enough energy to damage sensitive electronic equipment.
This function detects spikes on the voltage signal and stores a picture of the
signal in memory. A transient is detected when it crosses an envelope around
the voltage waveform. The width of the envelope can be set manually.
DETECTED NOT DETECTED DETECTED

Inrush Current

Inrush currents are surge currents which occur, for example, when a large
motor is started.
This function shows the current signal at the
moment of the surge. If the current exceeds
a specified level, the signal appears as a
gray band on the display formed by the
peak-peak values of the waveshape.
Use INRUSH CURRENT to look for inrush currents or other surge currents.
Measure the peak current and duration of the surge current.
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