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Active power and phase calibration.

Question asked by faridmab on Dec 18, 2017
Latest reply on Jan 3, 2018 by Gary.Kang.AnalogDevices

I am trying to calibrate for Phase and active power using a reactive load with a power factor of 0.5.  I am using the App note: AN1075. The value I calculated for LINECYC register=26966; period=1424, WATTHR_REF=10000; Vrms_nominal=120V, Irms(Nominal)=4A.

 

The value of WATTHR I read after IRQ0 interrupt is triggered is: 1050; I am wondering why this value is way less than LINECYC register value.

 

According to the equation on page 7 of the App note, AWGAIN is supposed to be less than 1.

 

Could anyone please comment on this?

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