Comment summary #34
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Comment 331 ... 340
| date | article | author | comment |
| 25 jan 2016 15:08:13 | Magnetic permeability | kaka | Hello, how can I set without a sensor B to 10 mT? how big should Rv be? Thanks! |
| 24 jan 2016 13:27:23 | Arduino wattmeter | Freddy | It doesn't matter if you're using another brand resistor as long as the specs are respected. I'm a little confused by your other remark. The voltage across the shunt depends on the current, not by the applied voltage on the voltage input. And if there is no current, the voltage at the current input is exactly the voltage on the COM. |
| 22 jan 2016 04:36:02 | Arduino wattmeter | Azzelle | Hi Freddy, Is there a difference if I use an Ohmite Current Sensing Resistor instead of the Vishay Dale? I have encountered a problem wherein the voltage drop of the ohmite just copies the value of the COM, it doesn't change with respect to the voltage source. Thanks. |
| 21 jan 2016 15:56:08 | Theory and Definitions | abel george | Sir i have a doubt.a mobile charger when not connected but on.what kind of losses will happen. It will be great if u can tell with values.plz sir |
| 20 jan 2016 15:08:06 | New wattmeter project | Freddy | The project is temporarily paused. My partner is momentarily too busy with another job. I hope to continue the work in a short term. |
| 17 jan 2016 20:30:31 | New wattmeter project | Traloch | Hi Freddy, Great job on the arduino wattmeter, very interesting project. I've been searching for exactly this for awhile now. I'm very interested in being able to log the data. I'd like to try it out when commissioning pumps to monitor startup and changes to power consumption when running. How close are you to releasing the new wattmeter project. |
| 05 jan 2016 14:02:04 | Measuring capacitance and ESR | Patricia | Hi i would like to know how you have done on Methode 2 to determinate the voltage across the resistor Rs. how did you came to this result: V_RS=√((V_g-V_x×cos〖α)〗 ²+(V_x×sinα)²) it will be very helpful thank you in advance sorry for my englisch im a french speaker patricia |
| 17 dec 2015 21:41:01 | Arduino wattmeter | Freddy | I'm not sure what you mean by "samples per cycle", the wattmeter samples continuously with 4808 samples/second. The ATmega328 on the Arduino Nano is running at 16 MHz, but the maximum clock frequency is 20 MHz. Using a 32 microcontroller with floating point unit like the STM32F407 would induce a great performance improvement of the software. |
| 17 dec 2015 21:23:44 | Measurement Errors | Freddy | Thanks for your compliments. All I have worked with are snippets of information, mainly from electronic magazines. The real knowledge comes from practical experiments I have done over the years. |
| 16 dec 2015 16:43:33 | Measurement Errors | Davi | Hi Freddy, I've been going around your website as I realised how little I really know about electrical measurement, thou I am actually a lecturer at the subject for technical courses. I was wondering if you had any books or further readings you would recommend. Thanks. Thank you for your website. Please keep it up. |