Comment summary #19
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Comment 181 ... 190
| date | article | author | comment |
| 19 nov 2016 14:23:18 | Arduino wattmeter | Freddy | Yes, you can measure 127VAC, as long it isn't part of the mains distribution grid. This for safety reasons. |
| 19 nov 2016 02:23:33 | Arduino wattmeter | Iván | Hi Freddy, I'm Iván. This wattmeter is awesome. Can I use this one for 127V AC? |
| 18 nov 2016 23:46:16 | Arduino wattmeter | Freddy | I think not. I didn't investigate it, but i suspect that the millis() function, just as the other timing functions occupies an internal timer which wil upset the program. |
| 18 nov 2016 11:59:36 | Arduino wattmeter | Cristiano | Hi, It would not be better to use the millis () function to measure time? Best regards. |
| 06 nov 2016 16:27:57 | Average & effective values | Dimitrios Malonas | in order to calculate the rms and average current for the thyristors t1, t2 and t3, t4 respectively in a single phase full wave controlled rectifier, someone shall use the equations given on the top of the page for a random waveform, with period in each case 2pi, is that correct? t1,t2 are forward biased for pi but a whole period of the waveform is 2pi. t3,t4 are forward biased for pi but again the period of the wave is 2pi and in the denominator we take into consideration the period of the waveform not the time that each of the two thyristors groups is forward biased. in the integral we can take again the whole period but as after pi ( in the case of t1,t2 for t3,t4 it would be till pi ) t1,t2 are reversed biased their current will be 0 between pi-2pi so we can just go ahead and for t1,t2 take the integral from 0 to pi and for t3,t4 take the integral from pi-2pi and the equation for average current for t1,t2 will be like : Idc = (1/2pi)* integral(0,pi)i(t)^2 d(t), right? thank you |
| 05 nov 2016 13:10:57 | Magnetic circuits | Freddy | The description and calculations are valid for the ringcore and the E-core or any shape you can come up with. |
| 04 nov 2016 12:13:28 | Magnetic circuits | Bijay Kumar Das | Hello, You have given the diagram of both E-core and a ring-core, but description is given for only E-core. Can you please share the ring-core description i.e. of an Alternator. That what will be it's magnetic circuit length, cross-section area & air gap length for calculation of Flux of an alternator for final emf calculation. Thanks in Advance, BIJAY Kumar |
| 26 okt 2016 13:55:25 | Magnetic permeability | MarP | Hello, I would like to assess the frequency behaviour of the real and imaginary permeability of ferrite 3C90 (FERROXCUBE) in the non-linear region of the material. I am interested in defining the mew'(f) and mew''(f) but in higher magnetic intensity (not at 25mT for example, where the magnetic core is working in the linear region, but in the non-linear region). So, I would like to have a set of graphs mew'(f) and mew''(f) for a range of H=[0-25]A/m. I would like to do this with resonance circuit, but the problem is that I am afraid that the result is not going to a normal "bell" as in the linear RLC circuits, but it will exhibit a sort of non-linearity. Does anybody have experience on this? How could I do these measurements? Could I do them simply with a Network Analyzer? Thank you very much |
| 22 okt 2016 00:53:42 | Arduino wattmeter | Freddy | Thanks, this makes it more clear. It is difficult to give you an replacement for the opamp because I can't say it would be available at your place. Better is to do an parametric search at digikey.com for instance, and then look if this part is sold in your region. The parameters are: - suitable for 5 volt supply operation - low offset voltage <= 5 μV - low offset drift <= 0.2 μV/°C - input bias current <= 500 pA - bandwidth >= 2 MHz |
| 20 okt 2016 21:29:13 | Arduino wattmeter | Sercan Yavuz | In fact, I want to make electrosurgical unit tester. To test the electro cutting device used in the operating room. I make a special resistance to withstand the load resistance up to 400 watts. for example 50 ohms / 400 watts, 200 ohms / 400watt, 300 ohms to 400 watts. This flow of electric cutting device will do measurements over specific resistance. changing the resistance R1 and R3. now my question is, IC1-CN8 LTC1050 can not find here, what else can I use? thanks for your interest. best regards. |