Home » Forums » Archived: Questions and support

EmonTX voltage and one CT

Submitted by Guest on Sun, 05/02/2012 - 18:36

Hi all,

 

I have updated my EmonTX with the voltage measurement parts. And uploaded the:

emonTx_3CT_Voltage_Temperature_pulse

example. But I keep getting strange negative value's.

 

I have changed the CT input to CT2.

 

Is there any calibration neccesy? Of other settings ? like the CT_TURNS and RMS_Voltage ?!

 

Cheers.

 

‹ Testing CT function Convert Nanode 5 to Nanode RF ?! ›
»
Paul Reed's picture

Re: EmonTX voltage and one CT

Submitted by Paul Reed on Sun, 05/02/2012 - 22:37.

 Probably a daft answer.... but have you tried re-attaching the CT clamp the opposite way around?

Once you monitor the voltage waveform, the current sensor can determine which way the power is flowing, and if wrongly connected can report negative values.

Paul

»

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.