Real and Active Power Register Values

I am testing a product with the ADE9178 with 4xADE9112 ADCs. At the moment I'm just testing the basic uncalibrated operation.

I've noticed that when I perform a read of the power (xWATT) and active power (xVA) registers with a "pure" resistive load attached (i.e. power factor is ~1), then sometimes the xWATT register value is higher than the xVA register. For example, I just got a reading of 1227936 for AWATT and 1227929 for AVA.

I have two questions:

I assume this is expected at power factors close to 1. Is this a correct assumption?

I assume that calibrating the ADE9178 will make no difference as the two registers share a common gain value. Is this a correct assumption?

hardware

processors and dsp

power metering

ADE9178

Processors and Microcontrollers