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ADE 7880 Accuracy Issue

Question asked by Heimo1 on Apr 7, 2014
Latest reply on Oct 15, 2014 by Heimo1

Hi!

I have a problem with ADE7880 and the accuracy of the active power.

I do the calibration as mentioned in AN-1171

My calibration steps as follows:

1. gain matching

2. Phase calibration

3. Watt hours per LSB

4. xPGAIN

5. RMS current and voltage per LSB

6. Watt and VA per LSB

 

I calibrate with nominal value for U = 110V, angle 0° and I = 1A, angle 300° and the power factor of 0,5

 

The measurements for calibration values bring good results (U = 110V, 0°;I = 1A,300°;PF = 0,5):

109.997  U L1-N

1.000     I L1

55.063   P L1

110.076 S L1

0.505   PF L1

 

But for example (active power with an error of 1.8%):

U = 110V, 0°;I = 1A,240°;PF = 0,5:

109.991 U L1-N

1.000   I L1

-53.997   P L1

110.082  S L1

0.495  L1

 

another worse example concerning the power factor!

U = 110V, 0°;I = 1A,0°;PF = 1:

109.991  U L1-N

1.000    I L1

109.028  P L1

110.063  S L1

-0.999  PF L1

 

Has anybody an idea to get more accuracy?

 

Regards

Heimo

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