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Re: ADE7880 - Questions on phase angle measurement

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Hi Karen

 

1. Should I read angle register when the phase voltage zero crossing event occurred? Or it doesn't matter.

hmani: It doesn't matter. The angle register updates only after getting the two necessary zero-crossings (negative to positive transitions) needed for the measurement. So, you need not worry about reading any bad values in-between.

2. Upon the data sheet, for the angle register, 1 LSB presents 3.90625 us. It is independent from the line voltage frequency, is it righ?

hmani: Yes. But based on the line frequency, the angle resolution will vary (as per datasheet- page 33 Rev.B)

3. Can I change the ANGLESEL bits setting dynamically (any time) during the operation? Or must reset the ADE7880 chip after the change? If I could, is there any settling time after the change?

hmani: No reset required. After you change the ANGLESEL bits, wait for the first zero-crossing to occur on both signals being sensed (as per the new setting) and then read the ANGLEx register.

 

Regards

hmani


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