Ref voltages on emonpi and emontx calibration and more accuracy

[stuart]

Have you read through the emonTX calibration articles?

Emontx voltage Calibration

Hi All, just wanting to get my thoughts correct as im new to modifying the programming for Audrino based items. i know nothing about “sketches”, are these another name for firmware? i have 3 Emontx V3’s ( got these before i knew about he IoTaWatt) all with EmonESP modules, all talking to my own EmonCMS server. so i have about a 10% discrepancy in my voltage readings on my emonTX’s compared to what is actually there. i have read the guide about calibration and comprehend what is needed to be c…

Calibration of emonTX3.4 and attached CT inputs (USA)

Thanks to Glyn, Robert and Bill (whose sigh of relief was heard across the Atlantic) my system seems to be up and running. However, my feeling is that the power calibration is not correct for power1-4 which I am using. I have adjusted the scale factor for Vrms (emonhub.conf) so that my emon input reads the same as my mains (Fluke 87 III). I have a 9v AC/AC adapter purchased in the US. On power1 &2 I have two SCT023Rs connected to the mains so I can read each plus a sum of the two feeds On pow…