Fluke 434 User Manual download pdf (Page 18)

Fluke 433/434

Users Manual

3-2

Measuring modes to investigate details

Phase voltages. Should be close to the nominal value. Voltage waveforms must be a sine

wave that is smooth and free from distortion. Use Scope Waveform to check the

waveform shape. Use Dips & Swells to record sudden voltage changes. Use Transients

mode to capture voltage anomalies.

Phase currents. Use Volts/Amps/Hertz and Dips & Swells to check current/voltage

relations. Use Inrush Current to record sudden current increases like motor inrush.

Crest Factor. A CF of 1.8 or higher means high waveform distortion. Use Scope

Waveform to see waveform distortion. Use Harmonics mode to identify harmonics and

THD (Total Harmonic Distortion).

Harmonics. Use Harmonics mode to check for voltage and current harmonics and THD

per phase. Use Trend to record harmonics over time.

Flicker. Use Flicker to check short and long term voltage flicker and related data per

phase. Use Trend to record these values over time.

Dips & Swells. Use Dips & Swells to record sudden voltage changes as short as half a

cycle.

Frequency. Should be close to nominal value. Frequency is normally very stable. Select

Volts/Amps/Hertz to display frequency. The course of frequency over time is recorded in

the Trend screen.

Unbalance. Each phase voltage should not differ more than 1 % from the average of the

three. Current unbalance should not exceed 10 %. Use Scope Phasor or Unbalance mode

to investigate unbalances.

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Fluke 434 User Manual Page 18