MSP430F6749A: EVM custom board Power data validation

Hello,

For a custom board, a lot of things can cause an error in Active Power. For power metering, my guess would be an issue with calibration. There are some instructions on how to calibrate a device in chapter 6 of this Application Note. 

Would you be willing to post your schematic? That way I can help determine what else could be causing your error.

Thank you,

Susan

Hello, 

I am using EMDC tool for Calibration and code Generation 

Hello,

Thank you for the schematic images. I took a look, and I wonder if the issue is in the current sensing. I would recommend checking your line and your neutral currents. You can also refer to the Implementation of a Single-Phase Electronic Watt-Hour Meter Using MSP430F6736(A) Application Note section 3.2.2.

If your current is accurate, I would also check your voltage sensing and phase calibration for accuracy.

Outside of that, I also noticed these things about your schematic:

The capacitor on AUXVCC3 is 4.7 microFarad instead of the recommended 0.47 microFarad.

VASYS1/2 has 2 4.7 microFarad capacitors while the datasheet only recommends one.

DGND is connected to pin 77, but I believe it is supposed to be connected to pin 76.

Hopefully this helps,

Susan Moore