Building, trying and explaining several DIY phase rotation tester circuits, including the schematics. These can indicate the sequence of the 3 phases of a three-phase system. They are especially useful when connecting three-phase induction motors (if the sequence is wrong, the motor turns backwards). WARNING! The devices operate with a hazardous voltage! Risk of electric shock or burns. You do everything at your own risk and responsibility.
The red tester on my website (with the schematic and the table):
https://danyk.cz/sled_fazi_en.html
The online calculator - Catculator:
https://ohmslaw.eu/
Get the DPOX180H 2-channel 180MHz oscilloscope:
https://www.fnirsi.com/products/dpox180h?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013
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