hipshot Posted August 8, 2008 Posted August 8, 2008 i have a question, for all you "electronic geniuses", out there. what is "true RMS". today, i swapped a $50.00 "wal-mart gift card", for a FLUKE 117 true rms electrician's multi tester. brand new, still in the shrink wrapper. how bad did i get hosed? just jt
Redneck Posted August 8, 2008 Posted August 8, 2008 Boy you got hosed bad. Being the nice guy that I am you can send it to me and I will give you your money back just out of the kindness of my heart.
Midrsv Posted August 8, 2008 Posted August 8, 2008 i have a question, for all you "electronic geniuses", out there. what is "true RMS". today, i swapped a $50.00 "wal-mart gift card", for a FLUKE 117 true rms electrician's multi tester. brand new, still in the shrink wrapper. how bad did i get hosed? just jt I would say you did allright. Online price is nearly $150. http://www.testequipmentdepot.com/fluke/dmm/117.htm?gclid=CIjAz6SU_ZQCFQH0Igod6wOlrA DT
Redneck Posted August 8, 2008 Posted August 8, 2008 http://answers.yahoo.com/question/index?qid=20060818063850AAvSOVx Its way to complicated for my simple mind.
hipshot Posted August 8, 2008 Author Posted August 8, 2008 http://answers.yahoo.com/question/index?qid=20060818063850AAvSOVx Its way to complicated for my simple mind. YESSIR! clear as mud , here , too! i'll never have occasion to use this feature, but it's nice to know that I COULDN'T IF I WANTED TO"LOL! thanks mike. oh, for the "hosing " i took. i guess i'll just keep it.might put it in the freezer for a while though, it has a warm smell to it! just jt
midnightventure Posted August 8, 2008 Posted August 8, 2008 A ac powersource is constantly changing magnitude and direction. RMS is root mean square. They use a mathematical formula for calculating the average.
midnightventure Posted August 8, 2008 Posted August 8, 2008 I would also give you your money back. Anything with Fluke on it is good stuff.
RedRider Posted August 8, 2008 Posted August 8, 2008 RMS - Root Mean Square is a true measurement of amperage and/or power. AC power is transmitted in a sinusoidal wave form at 60 Hz (50 Hz in Europe). If you take the peak of the amperage and multiply it by (sqrt2)/2 = 0.707, you end up with the RMS value. In effect, it equals the true area under the curve. (I hope I got that right) You got a good buy. RR
rod Posted August 8, 2008 Posted August 8, 2008 Good meter. For normal usage true RMS won't make a difference. It matters when trouble shooting some stuff Like motor controllers, VSD,some power supply's/generators. With digital meters you will get "ghost" readings they are real sensitive to RF and any induced voltage. Rod
Pilot Posted August 8, 2008 Posted August 8, 2008 This will clear it up for you. http://www.allaboutcircuits.com/vol_2/chpt_1/3.html
pegscraper Posted August 8, 2008 Posted August 8, 2008 RMS - Root Mean Square is a true measurement of amperage and/or power. AC power is transmitted in a sinusoidal wave form at 60 Hz (50 Hz in Europe). If you take the peak of the amperage and multiply it by (sqrt2)/2 = 0.707, you end up with the RMS value. In effect, it equals the true area under the curve. (I hope I got that right) You got a good buy. RR RMS is root mean square, but that formula is wrong, isn't it? I thought the formula was 1/(sqrt2) to equal .707. For some reason the answer comes out the same. I don't know why that works. Maybe that's just the magic of the number.
SilvrT Posted August 8, 2008 Posted August 8, 2008 for all you "mathematicians" then... what's the answer to this complicated linear equasion? 3 + 4 * 5 = ?
Squidley Posted August 8, 2008 Posted August 8, 2008 for all you "mathematicians" then... what's the answer to this complicated linear equasion? 3 + 4 * 5 = ? 63....what do I win!
Squeeze Posted August 8, 2008 Posted August 8, 2008 for all you "mathematicians" then... what's the answer to this complicated linear equasion? 3 + 4 * 5 = ? I'm not 100 Percent sure about the Characters you used, but the Result would be 23 here in Germany. But it could possibly mean also 16807.
spear Posted August 9, 2008 Posted August 9, 2008 I gather that the * is a substitute for X. In that case the question is: what is 3+4X5? We (should) know that multiplicands and dividers are acted on first. In this case the solution is 3 + (4 X 5) = 3 + 20 = 23. I win (too)!
spear Posted August 9, 2008 Posted August 9, 2008 . . . and now that we've worked out what RMS stands for, how about PMP? And what's the difference?
dr_bar Posted August 9, 2008 Posted August 9, 2008 Unless otherwise indicated, (ie parenthesis) don't you perform the math in the order it's presented? Then that would equal 35
V7Goose Posted August 9, 2008 Posted August 9, 2008 Unless otherwise indicated, (ie parenthesis) don't you perform the math in the order it's presented? Then that would equal 35 Basic grade school math - the Ausie got it right. It's 23.
spear Posted August 10, 2008 Posted August 10, 2008 Basic grade school math - the Ausie got it right. It's 23. I knew that. Thanks Kent.
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