Fluke 43B
Applications Manual
20
6
The Fluke 43B starts recording sags and
swells.
Wait for 4 minutes... or press the
HOLD key to
stop the recording.
7 Move the cursor over a sag or
swell.
Observe the rms voltage of the sag or swell: in case of a sag, read the
minimum voltage, in case of a swell the maximum voltage.
Observe the time when it occurred.
Determine where the sag or swell came from:
When the voltage decreases and the current does not change
or only slightly, the source of the problem is upstream.
V
A
When the voltage decreases while the current increases, there
is some load that causes the voltage to drop. The source of the
problem is downstream.
V
A
Tip
If you find sags or swells, search for equipment which may cause
them, such as large motor startups, welders, etc.
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