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whats is TRUE rms ?

Created by: Scorpio31 at: 7/5/2013 11:02 AM (5 Replies)

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7/5/2013 11:02 AM	Rate (0)
Scorpio31 Posts: 47 Rating: (8)	HI, in college we read about RMS current etc... now a days there is a new concept called TRUE RMS what is this True means? Kindly suggest with some example.
Scorpio31 Posts: 47 Rating: (8)
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7/5/2013 11:20 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Google is your friend.
IBN-Service Posts: 8946 Rating: (1000)
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This contribution was helpful to 2 thankful Users playerslight Vithani

7/5/2013 11:26 AM	Rate (0)
AMAZINGAHMED Posts: 719 Rating: (88)	Scorpio31 HI, in college we read about RMS current etc... now a days there is a new concept called TRUE RMS what is this True means? Kindly suggest with some example. True means measured by calculating the heat dissipated through a resistive load instead of just measuring 0.707 the peak current. Checkthis linkfor more and better calculations.
AMAZINGAHMED Posts: 719 Rating: (88)
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7/5/2013 11:27 AM	Rate (0)
Amit_86 Posts: 1750 Rating: (272)	Scorpio31 HI, in college we read about RMS current etc... now a days there is a new concept called TRUE RMS what is this True means? Kindly suggest with some example. Hello, I have googled it for you. To understand the meaning of true Root-Mean Square (RMS) one need to go to its mathematical and a more pragmatic physical definition. Since we are dealing with a changing quantity we need to compute its average value over a period, however it also has its positive and negative components. This is why we need RMS. An alternating voltage can be expressed as V(t)=V(peak) sin(2Pi f t). This is an equation for a signal of frequency f and amplitude V(peak) The RMS term comes from statistics and can be stated as V(rms)=sqrt((1/N)(sum of (V(i)^2) form 1 to N) for single frequency N=to the period. When it comes to a real world of periodic signals the signal can vary in frequency and complexity. Fortunately any complex periodic signal can be decomposed into sine-waves of many amplitudes and frequencies. As you probably have guessed this could be a computational nightmare. A practical approach would be to apply its physical definition. V(rms)=sqrt(P(avg)/R) The true RMS voltage is measured using the following method. P(avg) is the average power dissipated in a resistor R when a RMS voltage V(rms) is applied. The power is measured by a thermistor and the scale of the meter is calibrated as a ratio of temperature to resistance. This is true for any waveform and frequencies. Note that most meters you use are not true RMS meters. They measure only an average or a DC equivalent of a 60Hz pure sine wave. For a sine wave V(rms)=0.707 V(peak) See references supplied. Have fun
Amit_86 Posts: 1750 Rating: (272)
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7/5/2013 11:32 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Amit_86 Scorpio31 HI, in college we read about RMS current etc... now a days there is a new concept called TRUE RMS what is this True means? Kindly suggest with some example. Hello, I have googled it for you.
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7/5/2013 5:46 PM	Rate (0)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	Scorpio31 HI, in college we read about RMS current etc... now a days there is a new concept called TRUE RMS what is this True means? Kindly suggest with some example. Normally you might have heard this TRUE RMS word for measuring equipment In addition to nice explanation above i want to say in short - Normal RMS instrument will Measure RMS value of Sinusoidal waveform, or it will assume waveform is sinusoidal if actual is different where as TRUE RMS instrument will measure Actual RMS value whatever is pattern of waveform Regards, Devesh
	I dont Like people driving Fast, thats the reason I overtake them ;)
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