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Car Forum / Driving, Maintenance, Tuning / RVs / November 2005What is the formula for measuring Inverter output voltage ?
For example, if you are getting a reading of 89 vac output at a 700 w. Vector Inverter using a relatively inexpensive voltmeter, what is the 'actual common' voltage output really ? Is there a formula ? Thanks. > For example, if you are getting a reading of 89 vac output at a 700 w. > Vector Inverter using a relatively inexpensive voltmeter, what is the > 'actual common' voltage output really ? Is there a formula ? Get a meter that reads "True RMS."  SignatureD.J., N8DO; FMCA 147762 dj[underscore]osborn at yahoo dot com 'Get a meter that reads "True RMS." ' REPLY: THe question was : Is there / what is the formula ; not what meter i need to get. > 'Get a meter that reads "True RMS." ' > > REPLY: THe question was : Is there / what is the formula ; not what > meter i need to get. Dave from all of the post you put up I have come to the conclusion that you are either a dunce or wish to stir things up with drivel. If you really want an answer to the question go to the library and get a book on simple electronics and circuit measurement. And yes purchase a meter that reads in "true RMS". I will give you a hint RMS root mean square which is .707 if my memory serves me correctly. Capt Hook >> 'Get a meter that reads "True RMS." ' >> [quoted text clipped - 9 lines] > > Capt Hook .707 is only true for a true sine wave. It is only an approximation for anything else. The coefficient should be 1.0 for a true square wave output. Now how to get the right number? Try looking at the output with an oscilloscope, if you have one laying around on the junk bench. John Andrews, Knoxville, Tennessee 'Dave from all of the post you put up I have come to the conclusion that you are either a dunce or wish to stir things up with drivel. If you really want an answer to the question go to the library and get a book on simple electronics and circuit measurement. And yes purchase a meter that reads in "true RMS". I will give you a hint RMS root mean square which is .707 if my memory serves me correctly. Capt Hook' REPLY: I think you need to practice the pop cultures philosophy of Tolerance, Hook .... and take a Dale Carnegie course to improve your personality. If you are not sure of the .707 then i cannot accept your answer as being accurate, and, I shall contact Vector directly to find out for sure. > 'Dave from all of the post you put up I have come to the conclusion that > you are either a dunce or wish to stir things up with drivel. If you [quoted text clipped - 9 lines] > answer as being accurate, and, I shall contact Vector directly to find > out for sure. So, why didn't you do this to start with? > 'Dave from all of the post you put up I have come to the conclusion that > you are either a dunce or wish to stir things up with drivel. If you [quoted text clipped - 9 lines] > answer as being accurate, and, I shall contact Vector directly to find > out for sure. Listen you idiot, I am sure of the result of what RMS and .707 refer to. I am just trying to point out that you ask questions like and very uneducated person with little if any interest in learning anything. Also should the results of Dave in Lake Villa Googled on Groups prove half way right in what is written about you and what you post in other areas you really need some help. I taught tech school and found the kids that learned the most found the answer them selves. Capt Hook I see you've had the unfortunate experience of running into one of webtv's most prolific anti-sex religious trolling nic-switching a.sholes.... Dave asks many questions, doesn't feel the need to search out answers on his own, usually posing as a newbie to sucker people into long mindless extended rants about pop culture, sex promiscuity, creationism, religion and just plain nonsense. Just google his any many webtv nics for some examples of his fundy idiocy daveinillinois @webtv.net godisnumeoruno @webtv.net HVACfella @webtv.net itisdave @webtv.net fast1970vette @webtv.net msmarypoppins @webtv.net filthpolice @webtv.net decencyadvocate @webtv.net DNandB @webtv.net and the list goes on and on..Ken > 'Get a meter that reads "True RMS." ' > > REPLY: THe question was : Is there / what is the formula ; not what > meter i need to get. There really is not ONE formula, as the error depends on the circuit in the meter measuring it AND the waveform being measured. Unless you know both, you cannot calculate the "difference". The advice to get a meter measuring true RMS is good, if you really NEED to measure the output voltage of your inverter. If this inverter is "modified sine wave" the rms voltage out is not a perfect indicator of whether an appliance will run OK from it. I use my inverter, and if an appliance works on it I do not worry about it. I do not run motors from my inverter, so there is nothing that will be harmed by under voltage. Stuff just stops working..... Understand that true RMS voltage measures the heating value of the waveform measured. With a sinusoidal waveform, the peak voltage is 1.4 times the rms value. The square nature of the modified sine waveform means the inverter can generate a given heating value with lower peak voltage. There are appliances that rely on the peak value of a sinusoidal waveform (1.4 * the rms value) to generate enough voltage to operate. These appliances may not operate on a modified sine wave inverter. I have never found any appliance that was not happy on my modified sine inverter, but I'm sure there would be some.... HTH, Barrie B 'Understand that true RMS voltage measures the heating value of the waveform measured. With a sinusoidal waveform, the peak voltage is 1.4 times the rms value. The square nature of the modified sine waveform means the inverter can generate a given heating value with lower peak voltage. There are appliances that rely on the peak value of a sinusoidal waveform (1.4 * the rms value) to generate enough voltage to operate. These appliances may not operate on a modified sine wave inverter. I have never found any appliance that was not happy on my modified sine inverter, but I'm sure there would be some.... HTH, Barrie B ' REPLY: Thanks Barrie. > 'Get a meter that reads "True RMS." ' > > REPLY: THe question was : Is there / what is the formula ; not what > meter i need to get. I gave you the answer to the essence of your question, which was "How do I accurately determine the output voltage." SignatureD.J., N8DO; FMCA 147762 dj[underscore]osborn at yahoo dot com > For example, if you are getting a reading of 89 vac output at a 700 w. > Vector Inverter using a relatively inexpensive voltmeter, what is the > 'actual common' voltage output really ? Is there a formula ? > > Thanks. Trolling again, Pedophile? You have 2 choices. 1) put new batteries in your meter. 2) Get a real meter. I'm guessing this isn't the meter you use to do your supposed HVAC work, is it? Oh, DJ Osborn gave a good 3rd choice....
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