Zeecue, thanks, but I believe you have misunderstood my question.

I am not asking how to measure current.

I am not even asking how to measure wattage on my DS1052Z.

I am asking how to measure simultaneously 2 wattages to compare them.

I have managed to multiply 2 channels to create wattage, but I am unsure how to perform this simultaneously on the other 2 channels.

The math function, from my teaching myself one day only, seems to be limited to one operation of 2 channels only.

Though there is something called fx Operation, but I'm not sure hat can be made to do this.

So can it be done?

Thanks!