Hioki PQ3198, Instruction Manual

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1.1 Procedure for Investigating Power Supply Quality
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 Record voltage and current trends at the power circuit inlet.
If current consumption in a building is high while the voltage is low, the cause likely lies inside the build-
ing. If the voltage and current are both low, the cause is likely to lie outside the building. It's extremely
important to select the right measurement locations and to measure current.
 Check power trends.
Overloaded equipment can cause problems. By understanding power trends, you can more easily iden-
tify problematic equipment and locations.
 Check when the problem occurs.
Equipment that is operating or turning off or on when abnormalities (events) are recorded may be prob-
lematic. By understanding the precise times at which abnormalities (events) start and stop, you can more
easily identify problematic equipment and locations.
 Check for heat and unusual sounds.
Motors, transformers, and wiring may produce heat or unusual sounds due to causes such as overload-
ing or harmonics.
Advice for identifying the cause of abnormalities
HIOKI PQ3198A961-03