Comment summary #35
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Comment 341 ... 350
| date | article | author | comment |
| 16 dec 2015 16:15:49 | Arduino wattmeter | Davi | Hi Freddy, you did a very good job. I made a very similar project some time ago, but instead of a shunt, I used a split core to make it non-invasive. My code was not as near as good as yours, thou. I had problems measuring THD from higher orders. How many samples per cycle did you get? Your code is amazing. I wonder how fast it can run. |
| 06 dec 2015 15:52:19 | Arduino wattmeter | Freddy | See the description and calculations for R1 and R3 in the chapter "Voltage & current range". |
| 06 dec 2015 15:46:48 | Magnetic permeability | Freddy | I don't understand your question. There are two calculations for the magnetic permeability mentioned in this article. |
| 06 dec 2015 14:46:38 | Magnetic permeability | Sujit Bera | How we get the formula of calculating magnetic permeability |
| 04 dec 2015 21:23:47 | Arduino wattmeter | saman | kindly I have special respect for your good job, if the input voltage = 220 volt , and current range =10 ampere , what are resistors value must be change ? |
| 04 dec 2015 12:23:03 | Average & effective values | kumar | full wave sine function clipped the how to find rms and avg value.\\\\\\ \\\\\\ first cycle of sine wave is 0 to pi, peak value is y\\\\\\ after clipping wave peak value is 0.707y and period is pi/4 to 3pi/4\\\\\\ \\\\\\ how to calculate avg and rms \\\\\\ not able to upload pic of wave form |
| 04 dec 2015 12:02:39 | Average & effective values | Freddy | Also the high time must be known. Then the duty-cycle is calculated by the time the signal is high divided by the period time: δ=Th/Tp. The value of duty-cycle δ lies between 0 and 1. |
| 04 dec 2015 08:57:44 | Average & effective values | vivek | how to find duty cycle if time period given |
| 30 nov 2015 12:05:14 | Accuracy, precision & resolution | Freddy | The given resistive error from the probe and the input of the scope have both influence on the total error. So include both errors to the total error equation. |
| 30 nov 2015 11:53:32 | Arduino wattmeter | Freddy | @Manuel: If you replace the shunt by one that has lower specs, the measurement error will increase. Search for types with a very low temperature coefficient and a very low thermoelectric voltage. @Kalyan: Both grounds, analog and digital, may only be connected at one place. This place is internally in the Arduino. J2-2 and J1-4 are already connected together on the Arduino board. |