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ADE7880 xRMSOS

Question asked by Bastler on Apr 2, 2014
Latest reply on Apr 7, 2014 by Bastler

Hi,

I have a problem with the offset calculation, so I made a test with short circuit inputs.

 

I get a result of the AIRMS register of 0x0004A2 with AIRMSOS = 0x000000

For my tests, I write a negativ value to AIRMSOS = 0xFFFEFF.

 

The calculated result of the ADE7880 is AIRMS = 0x00B513, I thought the value will be decreased ?

 

What does the ADE 7880 with the formula  Irms=(Irms0^2 + 128*AIRMSOS)^0.5  ?

                                                                      0xB513 = (0x0004A2^2+128* 0xFFFEFF)^0.5

 

Do I have to convert the value of the AIRMSOS register ?

 

Kind regards

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