Funny, what you are calling an error in my setup, I was calling an error in the calculations. Thanks for jumping in as I did not want to answer oh2hyt because I knew they were correct. I just assumed this was a missing firmware calc.
I was expecting the meter to measure the power at the load and would include the burden voltage as part of that calculation which is why it is connected this way. Yes, if I wanted to measure the power dissipated by the load plus the meter, you are both correct and the three meters read very close. I had tested it up to around 50 Watts (5A 10V sort of range). I have not looked at AC.
So, to be clear this is really what the plan is? Not to display load power by compensating for the burden?
I don't recall when we discussed this way back, but IIRC it wasn't possible to measure the burden voltage in power measurement mode for some reason, hence there was no data to compensate.
You could of course guess and fudge in a number and do it that way, but is guessing better than not including it?
What if you actually want the entire power consumption? e.g. for PSU efficiency testing, which is a major use I envisaged for this function.
Ideally you'd want to select between the two modes.
I'll take another look at it though.
The second display can show the volts or amps BTW, just keep pressing SETUP to get to it, yes confusing, need to fix this in the firmware.
And IIRC the Gossen Energy doesn't compensate, but it's been a long time since I used it.