I just got a new emonTx and Ideal Power AC-AC adapter. This setup reads 114 volts for my mains voltage. My original emonTx with the same model adapter from the OEM shop reads 123 volts, which agrees with my multimeter.
I plugged the older AC-AC adapter into the new emonTx and it read 123 volts. So it’s the adapter, not the emonTx.
Is that amount of error normal? It’s seems like more than the expected 5% tolerance for the AC-AC adapter.
Also I can load a new sketch to calibrate the emonTx to the adapter, but I’m curious what part of the sketch would be best to modify.