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Calibration of ADE7753 for IRMS and VRMS

Question asked by adnan on Feb 25, 2013
Latest reply on Aug 30, 2016 by mathias2286



I need to calibrate the ADE7753 for IRMS and VRMS. The input voltage is 230V and the load is a heater of 150W. I am reading out rms register value for both voltage and current. The voltage scaling factor is 0.0585, to convert the VRMS register value to volts. The current scaling factor is 0.606, to convert the IRMS register value to amps. The voltage reading (after factor multiplicaiton) comes out with an offset of +/-5V i.e. some times 225V or 233V etc.


As explained in the data sheet page 45, to compute value for the VRMSOS (equation 65). But computing the value for the VRMSOS is a bit confusing.  What values of V1 and V2 should be considered (and the respective VRMS registers value to be noted), so that the value for the VRMSOS be calculated?  and same for current IRMS?


If i take input voltage V1=230V and read out the VRMS value, then set input voltage V2=210V  and again note the VRMS value. Compute VRMSOS using equation 65 and load the value into the VRMSOS register, but this does not do any calibration for the VRMS.


Any help in this regard will be appreciated.



Adnan Akhtar