I am trying to calibrate the PFA register in ADE7953, but I understood from that datasheet that the PFA needs no calibration, but only needs simple conversion.
the matter seemed to me to be straight forward , but the strange thing, is that I got strange results.
I connected a filament lamp, and I checked its power factor using wattmeter, and it shows that its PF is 1, while the ADE7953 shows that the PF is around 0.65.
I connected purely capacitive load (an AC Capacitor), and the resulting PF is 0.25 (I do not remember if it was 0.25 or -0.25 in fact, but it is not the main issue to me, the main issue is the strange magnitude)
of course I excluded the MSB bit from conversion as it is just a sign indicator.
the current sensing element is shunt resistor, so it does not make any offset in phase.
I do not understand, what is wrong? does this register needs any calibration?