hipshot Posted August 8, 2008 Share #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 Link to comment Share on other sites More sharing options...
Redneck Posted August 8, 2008 Share #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. Link to comment Share on other sites More sharing options...
Midrsv Posted August 8, 2008 Share #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 Link to comment Share on other sites More sharing options...
Redneck Posted August 8, 2008 Share #4 Posted August 8, 2008 http://answers.yahoo.com/question/index?qid=20060818063850AAvSOVx Its way to complicated for my simple mind. Link to comment Share on other sites More sharing options...
hipshot Posted August 8, 2008 Author Share #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 Link to comment Share on other sites More sharing options...
midnightventure Posted August 8, 2008 Share #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. Link to comment Share on other sites More sharing options...
Condor Posted August 8, 2008 Share #7 Posted August 8, 2008 I gotta headache........... Link to comment Share on other sites More sharing options...
midnightventure Posted August 8, 2008 Share #8 Posted August 8, 2008 I would also give you your money back. Anything with Fluke on it is good stuff. Link to comment Share on other sites More sharing options...
RedRider Posted August 8, 2008 Share #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 Link to comment Share on other sites More sharing options...
rod Posted August 8, 2008 Share #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 Link to comment Share on other sites More sharing options...
Pilot Posted August 8, 2008 Share #11 Posted August 8, 2008 This will clear it up for you. http://www.allaboutcircuits.com/vol_2/chpt_1/3.html Link to comment Share on other sites More sharing options...
pegscraper Posted August 8, 2008 Share #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. Link to comment Share on other sites More sharing options...
SilvrT Posted August 8, 2008 Share #13 Posted August 8, 2008 for all you "mathematicians" then... what's the answer to this complicated linear equasion? 3 + 4 * 5 = ? Link to comment Share on other sites More sharing options...
Squidley Posted August 8, 2008 Share #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! Link to comment Share on other sites More sharing options...
Squeeze Posted August 8, 2008 Share #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. Link to comment Share on other sites More sharing options...
KingSizer Posted August 8, 2008 Share #16 Posted August 8, 2008 Stop!!! Please just Stop!!!! Link to comment Share on other sites More sharing options...
spear Posted August 9, 2008 Share #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)! Link to comment Share on other sites More sharing options...
spear Posted August 9, 2008 Share #18 Posted August 9, 2008 . . . and now that we've worked out what RMS stands for, how about PMP? And what's the difference? Link to comment Share on other sites More sharing options...
dr_bar Posted August 9, 2008 Share #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 Link to comment Share on other sites More sharing options...
Two Tone White Posted August 9, 2008 Share #20 Posted August 9, 2008 35:clap2: Link to comment Share on other sites More sharing options...
V7Goose Posted August 9, 2008 Share #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. Link to comment Share on other sites More sharing options...
spear Posted August 10, 2008 Share #22 Posted August 10, 2008 Basic grade school math - the Ausie got it right. It's 23. I knew that. Thanks Kent. Link to comment Share on other sites More sharing options...
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