Fluke 434 User Manual download pdf (Page 35)

Volts/Amps/Hertz

Tips and Hints 8

8-3

Tips and Hints

Voltage and frequency should be close to the nominal values of for example 120 V, 230

V, 480 V, 60 Hz, or 50 Hz.

The voltages and currents in the table can e.g. be used to check if power applied to a 3-

phase induction motor is in balance. Voltage unbalance causes high unbalanced currents

in stator windings resulting in overheating and reduced motor life. Each of the phase

voltages should not differ more than 1 % from the average of the three. Current

unbalance should not exceed 10 %. In case of too high unbalance, use other measuring

modes to further analyze the power system.

A Crest Factor close to 2.0 indicates high distortion. CF = 2.0 can e.g. be found if you

measure the current drawn by rectifiers that only conduct at the sine wave top.

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Fluke 434 User Manual Page 35