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Update README.md
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Correct 3-phase CT clamp phase description as also mentioned here:
CircuitSetup#138
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@Yannik25
Yannik25 authored Oct 16, 2023
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Expand Up @@ -171,8 +171,8 @@ What you'll need to measure all 3 phases properly:
* JP12 and JP13 severed on the main board & add-on boards
Similar to the above for measuring a second voltage, once JP12 and JP13 are severed:
* CT1-CT3 on the main board, and CT1-CT3 on the add-on board will be in phase with the 1st phase
* CT3-CT4 on the main board with the 2nd phase
* CT3-CT4 on the add-on board with the 3rd phase.
* CT4-CT6 on the main board with the 2nd phase
* CT1-CT6 on the add-on board with the 3rd phase.

The transformers should be calibrated individually for greater accuracy.

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