strange results from THD measurement of mains
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I have followed the video on mains THD measurement. I used the ground differential measurement method on the wall outlet in the UK.
It reports the largest frequency being at 25hz and sometimes jumping to 34hz. This makes no sense to me, as I would have thought that a distorted 50hz sine wave would only have harmonics above 50hz.
I have attached a screen grab.
Have I made a configuration mistake ?
Regards,
Peter.
It reports the largest frequency being at 25hz and sometimes jumping to 34hz. This makes no sense to me, as I would have thought that a distorted 50hz sine wave would only have harmonics above 50hz.
I have attached a screen grab.
Have I made a configuration mistake ?
Regards,
Peter.