hipshot Posted August 8, 2008 #1 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 #2 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 #3 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 #4 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 #5 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 #6 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 #8 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 #9 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 #10 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 #11 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 #12 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 #13 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 #14 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 #15 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 #17 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 #18 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 #19 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 #21 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 #22 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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