Measureing RMS output of amp?

Started by Anonymous, July 6, 2003, 20:51

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Anonymous

July 6, 2003, 20:51 Last Edit: January 1, 1970, 01:00 by Anonymous
Guys im in need of a bit of help without using a osiloscope how do you measure the output of an amp in RMS ????

markiii

#1
July 6, 2003, 21:25 Last Edit: January 1, 1970, 01:00 by markiii
why don't you just divide the peak by  root 2
Gallardo Spyder<br />Ex Midnight Blue 911 T4S<br />EX VXR220<br />Ex Custom Turbo 2001 Sahara Sun MR2 Roadster 269bp, 240lbft<br /><br />MR2ROC Committee 2002 - 2009<br /><br />

Anonymous

#2
July 6, 2003, 22:03 Last Edit: January 1, 1970, 01:00 by Anonymous
because im not using all the power the gain is veribale ! so therefore the stated Max output is say 200 and the rms is 150 then if im using 25% if the max watts whast the rms?? without using maths im wondering if there is a way to measure it using a mulit meter???

markiii

#3
July 6, 2003, 22:20 Last Edit: January 1, 1970, 01:00 by markiii
so x =200 and y = 150

y = x/root 2

so if x is now 25% of its original value

new y = 0.25x/root 2

or written another way 0.25 * x/root 2

so if the new peak is 25% of the old peak the new rms will be 25% of the old rms
Gallardo Spyder<br />Ex Midnight Blue 911 T4S<br />EX VXR220<br />Ex Custom Turbo 2001 Sahara Sun MR2 Roadster 269bp, 240lbft<br /><br />MR2ROC Committee 2002 - 2009<br /><br />

Anonymous

#4
July 7, 2003, 17:16 Last Edit: January 1, 1970, 01:00 by Anonymous
Yeah But i want the RMS of teh amp ti be no more than 325 so what % do i put the gain??? I though that the only way of doing this was to actually measure the output, not the mathmatical side of it as it wouldnt be as accurate as you can never set teh gains to an ecasct %

Good maths tho Markii    s:lol: :lol: s:lol:
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