Fluke 434 User Manual download pdf (Page 41)

Dips & Swells

Tips and Hints 9

9-5

The following Abbreviations and Symbols are used in the tables:

Abbreviation Description Symbol Description

CHG Rapid Voltage Change Rising voltage edge

DIP Voltage Dip Falling voltage edge

INT Voltage Interruption

SWL Voltage Swell

Available function keys:

Switch between NORMAL and DETAILED event table.

Return to Trend screen.

Access Trend screen with Cursor on and positioned on the

highlighted event.

This event can be selected with the up/down arrow keys

Tips and Hints

The occurrence of Dips (Sags) and Swells may indicate a weak power distribution

system. In such a system voltage will change considerably when a big motor or a welding

machine is switched on or off. This may cause lights to flicker or even show visible

dimming. It may cause reset and loss of data in computer systems and process controllers.

By monitoring the voltage and current trend at the power service entrance, you can find

out if the cause of the voltage dip is inside or outside the building. The cause is inside the

building (downstream) when voltage drops while current rises; it is outside (upstream)

when both voltage and current drop.

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Fluke 434 User Manual Page 41