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Scope Waveform and Phasor
Tips and Hints 7
7-3
Tips and Hints
Scope Waveform gives a clear view of current and voltage waveform shapes. Voltage
waveforms in particular should be smooth and sinusoidal. If you see voltage distortion, it
is a good idea to check the harmonics display. The rms voltages and frequency should be
close to their nominal values.
Waveform and Phasor display are also useful to check if voltage leads and current clamps
are connected correctly. In the vector diagram the phase voltages A (L1), B (L2), and C
(L3) should appear in sequence at equal distance (120 degrees). Current vectors should
have the same direction as the voltage vector with usually less than 30 degree phase shift.
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