Second Iotawatt AC reference transformer

Hello,

I liked my first IotaWatt so much it’s time for another!

My question is around the AC reference transformer.

Would it be better (more accurate?) for me to use a single reference transformer and split the output using CCTV barrel splitters?

Or would it not matter to have two separate AC reference transformers?

Regardless of one or two, voltage accuracy depends on the calibration. Splitting has no measurable impact on accuracy, even splitting 4 or 5 times. With a splitter, you should expect identical voltage readings in the two units so long as you use the same calibration value.

Practical considerations should govern here. If the two units will be colocated, the splitter makes a lot of sense. If they are far apart, it may be more convenient to use a separate VT.