No need square waves? How about SMPS power supply repair, and auto mobil repair. For auto I think you better have a DSO, but for SMPS I think it's needed to measure duty cycle.
SQURE WAVES IS THE BEST OPINION and concept to design switching any kind of a supply without suing sine or another category. considering any kind of repair oscillesope is require wheter its to analyzible or not. in smps repairing we dont care much the duty cycle. for helath situation its try to keep constant frequency
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