Harmonics Reading

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As far as analysis goes, the usual concern is harmonic current. Voltage should ideally be unaffected by current. If the voltage is affected, it means that some of the supply is maxed out. It could mean that your main step-down transformer is fully loaded and there is no more room for the harmonic to be dissipated due to core saturation.

Some equipment is more sensitive than others with regard to the presence of harmonics. Typically you will not see issues until the percent of harmonic current (relative to the total current) exceeds 20%. If you have no symptoms, you generally don't have to worry about it. Odd harmonics can cause motors to run hotter, thereby reducing life. But to just measure the temperature may not tell you if things are currently good or bad. As with most things, you need a point of reference.