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why does the volmeter measure the rms value of voltage and not the peak or avg. value:?:??
Hi! For example, RFMD's RF5117 and Intersil's ISL3984 Does Somebody know how to design the peak detector(or power detector) for WLAN HBT power amplifier? Thanks!
hello pals, As long as I know, PMPO goes for peak Maximum Power Output and its relation to the rms value depends on several factors. As a rms value depends on the shape of the wave, so it does the PMPO. Due to the complexity of the audio signal and overshoot response of the amplifier, it would be impossible to predict EXACTLY the (...)
So 240*sqrt(2) is the dc equivalent. Isn't this the peak value of the ac as well?
These low cost meters measure either peak or average and do a guess for the rms based on the assumption that the input is a sine wave. I know of some types which do a series of random samples and calculate the rms from that. There is an IC that actually heats a resistor with the input signal and then heats another resistor with DC and (...)
Why not rule of thumb: (Vpeak-to-peak)*(0.707) = Vrms (Vrms)/(0.707) = Vpeak-to-peak ?
Hi ! Of course you have to adequate the 50V peak voltage signal to the input voltage limit of ports of the PICmicros (if Vdd = 5V, then the upper limit is 5V for the A/D analog or digital inputs). Use a voltage divider (1:10). Another restriction is the sample frequency if you are going to use the A/D converters of common PICs (16F and 18F se
rms is just the average voltage of an AC signal which is 1/√2 × peak~peak voltage of the signal, the word bandwidth can often be found to describe the frequency response of an amplifier, it is usually measured from the 3dB roll off point of the highest frequency to the lowest frequency of an amplifier or vice versa. eg. if an amplifier (...)
How to calculate the peak voltage on telephone line when the telephone ring?
The oscilloscope measures voltage. You need to know the load impedance to get power. For sine waves, rms is sqrt(2) times the peak (one sided peak not peak to peak) peak power has two meanings. One is the peak voltage related to the load impedance. Another is for (...)
Is sin, for eletric energy. Thaks ET if only one sinus carrier at AC-insignal, is easy (0.7071 * Up-p)/2 = voltage rms Up-p is measured voltage peak to peak. --- but if measure complex multi frequency and noise signal is more difficult. remember rms means 'root mean square' and represent powers heat di
moreover .why it should be rms ....why should not as +340V,-340V while referring because, simply said, this value (rms) is sort of a mean value which is engaged in, especially, power calculations, etc. e.g. for resistive loads power can be simply calculated multiplying current and voltage rms values: P
comparing signals means comparing power of the two signals i understand from your questions that you have 5V DC and 2.5V AC peak to peak DC power will equal AC power when AC value is given as rms (root mean square )value and not peak value that means if in your system : V DC *I DC=V rms AC *I (...)
I want to calculate True rms(Root Means Square) of Square Wave in Assembly Language of PIC 16F72. For a pure square wave: 1. Square waves: Like sine waves, square waves are described in terms of period, frequency and amplitude: peak amplitude, Vp , and
Output voltage has it's peak, rms or average value. No matter how it is measured the result depends on it's waveform or shape over time. If the voltage is pure DC it's peak, rms or average values are equal. Voltage with added ripple has different values for peak, rms and average measurement (...)
AWG 16 (.050" in diameter), is used to make an inductor of 100nH, to be used in a lumped elements banpass filter (Fc=450 MHz, IL=.40 dB) Can it handle 75w Watts averafge/ 200W peak of RF power? Krytar
Hi, not the expert in this field but I would say that the only difference might be in the time constant used in video portion of detector circuit. For peak detector the constant should be very small so that instantaneous value of the signal is detected, for rms detector it should be long so that integrator like performance is obtained. flyhig
Hi, I dont quiet understand the definition of peak to average ratio. Suppose my DAC outputs a signal with 10dB peak to average. If I measure the signal on the oscilloscope, will I see the peak signal 3.16 times (10dB) higher then the rms signal? example: rms = 0.1V peak to (...)
liuyonggen_1, An rms voltage, when connected to a resistive load will produce the same amount of power as A DC voltage of the same value. . Consider a square wave with a 1V "peak" value, a 0V "valley" value, and a 0.5 (50%) duty cycle. The average value is 0.5. The rms value is 1/SQRT(2). The power dissipated in a 1 Ohm load = X D
Hello, i was wondering what is the peak voltage , average voltage , rms voltage that a transistor 0.18um TSMC nominal Vth can tolerate on its gate before breaking down. as i have a pulse on the supply at start up and i want to know if it is OK , i think it is an electrical rule but i don't have the Documentation around me right now. thnx
for example you have an AC source its voltage is expressed by V(t)=A*cos(ωt) Volt at any time t the voltage instantenous vale is expressed by the equ. voltage peak vale is A peak 2peak value is 2*A while rms value is A/sqrt(2) rms for any waveform is the root of the mean of the signal squared.
For the second part rms = peak/sqrt(2) rms = peak-peak/(2√2) Hope you got it.
The answer to this issue lies in how they measure the output power of the device. PMPO stands for "peak Music Power Output" or "peak Momentary Power Output". Notice the word peak. They calculate PMPO based on the maximum power output of the device under perfect conditions and 100% efficiency. These conditions are impossible to obtain, and (...)
smartshashi, The rms value is the voltage in a purely resistive load that results in the same power (Heating effect) as a DC voltage of the same value. For example, a sine wave with a peak voltage of 1.0V. produces the same power into a resistive load as a DC voltage of (SQRT(2))/2 volts. So the rms vlaue of this AC voltage is (...)
Could someone please find me a definition? Is it from time average point of view ? Or from rms/peak voltage point of view? Thanks.
Its a simple calculation. Take the peak to peak value and divide it by square root of 2. Thats all. AVR Rulz!!
Hi, Normal multimeters assume the input to be a sine wave and calculates rms value based on the peak voltage. Such meters show the same rms value for a sine wave and a nonsine wave (say square wave), if both have the same peak value. True rms meters use special ICs to calculate the true (...)
Hi all, Could you please explain some jitter defiinition definitions. Suppose that we have a sine wave: I found this defintions: Jitterpeak-to-peak = Jittermax - Jittermin Period Jitter: The maximum change of the signal edge from the expected of ideal position in time Phase Jitter : The maximum
Hello! In my SMPS I need to use a current transformer. My rms current is < 15A, but the peak value is 33A (worst case). My question is, would a 25A rms current transformer be OK? I would like to use the CST306-2A transfomer: N: 1:100 Lm: 14mH Irms: 25A The problem is, the datasheet doesn't say anything about (...)
rms is all about comparing apples to apples, irrespective of what signal waveform is applied. The rms of a DC signal will be the DC signal, taking the rms of an AC, PWM, sawtooth or complex signal allows us to compare their 'real value' when comparing between them. Most of the cheaper meters don't measure true rms. They (...)
if you remove the rectifier+filter and add some DC bias for the ADC you can also measure the frequency, peak, rms and mean.
Hi, Hope someone can help me with the definition of signal-to-noise ratio (SNR). On the last page of this document: it is said that SNR is the ratio of the peak-to-peak signal and the rms noise However, wikipedia: says that it is the rat
Unfortunately, you come out with the 10 ps at the end. Of course 10 ps it's still just a number without telling about peak-to-peak, rms phase or period jitter. Seriously, you'll have difficulties to find a ready made 500 MHz crystal oscillator with a suficient jitter specification, you also must to decide about an I/O standard, ECL or (...)
Research shows that rms watts is defined as the continuous average power when the amplifier is driven with a sine wave while PMPO is the abbreviation for peak music power output which is recognised as the total useless since there is no agreed method of arriving at a figure. I think by now he might have got the
PMPO vs rms watts Those symbols are used for radio power. The real power is rms (Root Mean Square), while PMPO means music power (peak Music Power Output). How to compare those – you need to split PMPO by 3 and then you will get rms (almost). For example if you have JVC with 19W rms / 50W PMPO. (...)
Hello. just wanted to show the SMPS I have done. I dont know how to put it here. 1100W rms SMPS, 1700W peak For more informations. please see it at
if the current is sinusoidal then have a peak detector in th sy and calculate rms from peakvalue. srizbf 25thjune2010
For sinusoidal waveforms, the reference being 0.774Vrms = 0dBu: minus? dBu: -1dBu = 1.95Vpp -2dBu = 1.74Vpp -3dBu = 1.55Vpp -4dBu = 1.38Vpp -5dBu = 1.23Vpp -8dBu = 870mVpp -10dBu = 690mVpp -15dBu = 389mVpp -20dBu = 219mVpp -25dBu = 123mVpp -30dBu = 69mVpp -40dBu = 22mVpp -50dBu = 7mVpp Vpp is the rms voltage multiplied (...)
BER = Bit Error Rate For a serial data stream this give the number of bits which are sampled wrong due to jitter. So it is a precentage of errors. e.g. 10e-12 means one out of 10e12 bits are wrong. the rms (or sigma) value is given for random jitter (RJ) random jitter is gaussian and unbound (from the theory) For a gausian random jitter the
The average voltage of a sine wave is equal 0V. The average voltage is simply mathematical average nothing more. rms represent DC equivalent for power calculation. For example if I have 230V DC and I plug this voltage across light bulb. So to get the same amount of light with AC voltage you need connect 325Vp (peak) sin wave. Vrms =
As FvM states, you need to convert it first. The rms conversion takes care of the polarity and wave shape. Just dividing it by 3 would still give you (assuming a sine wave) a signal of 14V peak to peak. You may need to scale it before the rms conversion and you may need to amplify the result but there is no other reliable (...)
can someone help me with a circuit or a part number that converts 220v peak to peak from a transformer to 310v dc
I want to measure rms voltage between points a (0.5) V and I rewrite a program in C to achieve my purpose may i know it does not work with me each time I simulate, I vary the amplitude of input signal to the peak I receive on an LCD value false efficient value isis on my diagram is more than just a pic 16F877 connected with an LCD and a sine signa
I have a bit difficulty in understanding PMPO - the two different definitions about it and its purpose, and a question: Is it anything related to power consumption of the audio appliance? Anywhere i can understand it clearly, pls elaborate your explanation. PMPO = peak Music Power Output/peak momentary power output??
1) dB = 20*log_10(Vpp/0.707) 2) dB = 20*LOG10(Volts_peak_to_peak/SQRT(0.008*Z)) 3) db = (20log10) (rms ) & rms= 0.707*P-P 4) dB = 20 log10 (Voltage 1 / Voltage 2) 1) Maybe there is a mistype? If you substitute Vpp/0.707 by Vpk*0.707, it is the expression of a voltage in dBV (dB realtive to 1V) assuming it is sinusoi
Hello guys I'm doing some signal processing/data analysis. Hope to get some advice on something. I collected some vibration data just the other day while metal cutting and I'm wondering what is the correct (or better) way to do this. These are what the signals look like. Sampling rate of the data is 10000 hz.
Hello, Do you know of a mathematical expression that give the rms value of this Discontinuous current waveform? (i.e. supposing I know the peak value, the rise time, fall time and dead time)
well, I will use this AD736 for the 1st time like you! but I need to measure grid voltage. in the datasheet, there's some circuits. But, I see that the recommended input is 1v rms (you can consider it 1v peak) and the max is 5v (sometimes = supply voltage). so, what is the voltage I need to feed into the IC?
Hi... I made a circuit that rectify an AC signal into DC voltage equals the peak of that AC signal (typical usage). I need to calculate the rms voltage of that AC sinewave (only sinewave, for ease) signal and the specs are like the following: - 4 diodes for full-bridge rectifier. - 100uF/400v filtering capacitor. - a voltage divider with 11
rms() function gives Vpeak/CF, where CF means "Crest Factor". If signals are pure one-tone sinusoidal, CF is sqrt(2). See Note : rms() is for results of transient analysis. If your signals are results of ac analysis, you can't use rms(). In this case, use Vout/sqrt(2) simply without invoking rms(Vou