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### Topic: TDH meassuement (Read 1 time)previous topic - next topic

##### Jun 23, 2013, 01:08 am
Hi:

I'm thinking of building a THD measurement device for the AC mains line (110VAC). I have very little experience in power circuits and have no idea what the typical THD values for a regular house line could be. I can always go for up to 100% in the scale; but I don't think it will get even close to that in worst case real scenarios, so that will deteriorate the instrument's resolution. Any ideas of the typical range???
Also, can I sample the 60Hz fast enough with Arduino and get multiple samples for one cycle? How many sample do you think I can get per cycle using Arduino?

Thanks
Perseverance is 90% of the solution. The remaining 10% is more perseverance.

#### Magician

#1
##### Jun 23, 2013, 01:15 am
Have a look: http://coolarduino.wordpress.com/2013/01/04/power-quality-meter/

#### PeterH

#2
##### Jun 23, 2013, 01:16 am
Does THD mean total harmonic distortion? Do you know what values you need to measure and how to calculate the TDH from those measured values?
I only provide help via the forum - please do not contact me for private consultancy.

#3
##### Jun 23, 2013, 01:37 am
Quote
Have a look: http://coolarduino.wordpress.com/2013/01/04/power-quality-meter/

It's hard to come up with any ideas for things to do with Arduino now. They've done it all with Arduino already... Thanks for the link.

Quote
Does THD mean total harmonic distortion? Do you know what values you need to measure and how to calculate the TDH from those measured values?

Yes, total harmonic distortion. Yes I think I know.

http://en.wikipedia.org/wiki/Total_harmonic_distortion
Perseverance is 90% of the solution. The remaining 10% is more perseverance.

#4
##### Jun 23, 2013, 01:41 am
Sorry, THD.
Perseverance is 90% of the solution. The remaining 10% is more perseverance.

#### ha2709

#5
##### Nov 12, 2015, 05:17 pm
I want to build an arduino to measure THD, but I dont know how to make it. Pls help me. I found an instruction on duino4project but I dont have code.

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