73
4
+
3
~
2
~
1
–
Multimeter
6.9 Power supply waveforms check procedures
Measure the power supply waveform between No. 1(Live) and No. 2(Neutral) on the terminal board, and
check the waveform disturbance with oscilloscope.
• Check if the power supply waveform is a sine wave (Fig. 1).
• Check if there is waveform disturbance near the zero cross (sections circled in Fig. 2).
2 .giF1 .giF
)4441R()6271R(
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