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Calibrating IRMS of ADE7758

Question asked by Amol on Apr 9, 2015
Latest reply on May 21, 2015 by Amol

Hi,

I am using ADE7758 for power monitoring.

I am trying to calibrate AIRMS of ADE7758.

As per datasheet, on page number 55, formula given for xIRMSOS, I am trying to find out the offset for my channel B.

Since the register is of 12 bit & signed thus can hold only up to -2047 with it; But as per the formula I am getting -5899 as BIRMSOS.

 

Following are the readings.

Itest = 1.8A     BIRMStest = 43550

Imin = 0.71A     BIRMSmin = 19250

 

As per calculations, BIRMSOS = -5899.

Please help me to solve the problem.

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