Comment summary #14
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Comment 131 ... 140
| date | article | author | comment |
| 14 okt 2017 12:32:56 | Fast Lux meter | naresh | what simulATION SOFTWARE can be used to simulate this circuit |
| 05 okt 2017 03:59:15 | Arduino wattmeter | TEJAS NANDOLA | Pls pls help me with replacement of LTC 1050 ITS URGENT |
| 13 sep 2017 13:43:13 | Arduino wattmeter | Freddy | It's a little bit odd to talk about a "normal" subject of measurement. What people want to measure depends on their interest. It is for example possible that someone wants to now the delivered power of a solar installation or a battery. In such a case the circuit suits very well. It is always possible to swap the source and load in figure 10. The disadvantage of this is that the read current, power and energy becomes negative. The burden voltage is less than 55 mV. In a 12 volt installation the error induced by the shunt resistor is less than 0.46%. Don't forget that this is a very simple circuit that shows how to measure power accurately with a minimum of components. A more advanced power meter will have separated terminals for the voltage and current measurements. |
| 12 sep 2017 22:37:51 | Arduino wattmeter | xakepp35 | One would normally swap COM and A inputs/ Vdrop MUST be measured directly on the load and not on the power source! Otherwise wattmeter would not be precise anymore, measuring produced power, and not consumed. Thus forcing user take R3 into account. Though R3 is linear enough, it will be tricky to use calculator to calculate this everytime. Any caveats for doing that? Why you would you normally need to calculate wattmeter shunt consumption as well? PS. Great job anyways!!!! |
| 30 aug 2017 22:43:25 | Arduino: Analog measurements | Freddy | It's not very clear to me what you mean. But I think you're confused about the location of REFS0 and REFS1. In the ADMUX register bit 7 is REFS1 and bit 6 is REFS0. If the bits 5 and 4 are both 0 then the left nibble is 1100 (C) when the internal 1.1V ref is selected. The left nibble is 0100 (4) when AVcc is selected. The reserved reference source is selected when the left nibble is 1000 (8). |
| 30 aug 2017 16:41:32 | Arduino: Analog measurements | Gemma | As Tralamazza said on 19 nov, if you want ADMUX to be 1.1V reference you need this to be 0xC3 to set REFS0 and REFS1 to the correct 1,1 bit values instead of 0x43 which uses the reserved settings. And if what I have just said is not correct, why not?! |
| 11 aug 2017 01:36:37 | Arduino wattmeter | kiran | what is all parameter range of this wattmeter |
| 08 jul 2017 11:34:47 | Measuring capacitance and ESR | Jeremy | I'm interested to know how you came to 14.262 degrees when determining phi. My calculation of (Vg - Vx*cos(alpha))/Vg yields 0.403. Plugging that into acos gives 66.24 degrees. What number did you use for acos? |
| 06 jul 2017 21:53:23 | Additive synthese waveform generator | johny radio | this is great! would be awesome if we could export our custom waves, and then mix-import different waves. thx! |
| 24 jun 2017 12:57:31 | Multimeters - measurement deviation | Timothy Smith | I am having a problem finding a "Automotive" Multimeter that has True RMS for measuring AC/Ripple in a charging system. I currently own a Mac Tools EM700, that I have used for 8 years now, and is getting worn out from use, and am looking for a good rugged meter within a good price range that can do AC/Ripple as well as doing other small measurements without a huge price. I have looked at around 10 different units that claim that they do true RMS, when in fact, can't read True RMS at a sample rate thats correct for automotive use. Can you give me some suggestions? Maybe a unit that also does Data Logging? Thank You Tim |