Hi Guys,
What should i do about this ?
My Vrms on the emonTx_1 is reading 254.64 V
on the EmonPi it's 241.55 V
The AC-AC adaptors are both plugged into the same double socket and if i swap them over the emonTX still read high,
Regards
Paul
»
Archived Forum |
|
Different RMS voltages EmonPi and EmonTX3Submitted by wheelbarrowhandle on Fri, 12/06/2015 - 15:01Hi Guys, What should i do about this ? My Vrms on the emonTx_1 is reading 254.64 V on the EmonPi it's 241.55 V The AC-AC adaptors are both plugged into the same double socket and if i swap them over the emonTX still read high, Regards Paul
» |
Re: Different RMS voltages EmonPi and EmonTX3
What is the correct voltage? I think you need to read the Building Blocks pages about calibration and the sources of error in these measurements.
Re: Different RMS voltages EmonPi and EmonTX3
Thanks for the reply, I have now looked at the Calibration pages, and have installed the IDE, loaded the sketch and modified the Vcal figure to get the reported voltage to be closer to the reading from the multimeter.
In the calibration pages it says " but you will need to add some print statements in order to read separately the values for current and power factor" but doesn't say where.
Can someone point me in to the place where these prints need to be added.
Regards
Paul
Re: Different RMS voltages EmonPi and EmonTX3
Obviously after the values have been obtained with a call to X.calcVI( ) , where X is the instance of EnergyMonitor for the input you're interested in (ct1?).
If you look at emonLib.h, you'll see all the values that are available below the comment "//Useful value variables", and you use them like "Serial.print(X.powerFactor);"