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254 Threads found on edaboard.com: **Peak Rms**

why does the volmeter measure the **rms** value of voltage and not the **peak** or avg. value:?:??

Embedded Systems and Real-Time OS :: 09.05.2009 06:55 :: renzworldc :: Replies: **2** :: Views: **1140**

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!

Other Design :: 13.05.2002 11:16 :: cwcwecan :: Replies: **1** :: Views: **2311**

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 (...)

Hobby Circuits and Small Projects Problems :: 27.01.2003 09:44 :: 2000 :: Replies: **25** :: Views: **102575**

So 240*sqrt(2) is the dc equivalent. Isn't this the **peak** value of the ac as well?

Mathematics and Physics :: 22.03.2004 12:17 :: ee01akk :: Replies: **7** :: Views: **8121**

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 (...)

Hobby Circuits and Small Projects Problems :: 31.08.2004 13:25 :: flatulent :: Replies: **3** :: Views: **918**

Why not rule of thumb:
(V**peak**-to-**peak**)*(0.707) = V**rms**
(V**rms**)/(0.707) = V**peak**-to-**peak**
?

Electronic Elementary Questions :: 15.10.2004 20:11 :: djalli :: Replies: **25** :: Views: **8975**

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

Microcontrollers :: 16.03.2005 07:25 :: rkodaira :: Replies: **3** :: Views: **1356**

Electronic Elementary Questions :: 28.04.2005 09:21 :: Learner :: Replies: **7** :: Views: **5130**

How to calculate the **peak** voltage on telephone line when the telephone ring?

Professional Hardware and Electronics Design :: 08.06.2005 02:39 :: cqjhq :: Replies: **4** :: Views: **2260**

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 (...)

Electronic Elementary Questions :: 08.06.2005 22:06 :: flatulent :: Replies: **4** :: Views: **1388**

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

Microcontrollers :: 15.12.2005 18:39 :: xxargs :: Replies: **5** :: Views: **1009**

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

Electronic Elementary Questions :: 16.12.2005 08:59 :: Eric Best :: Replies: **23** :: Views: **20346**

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 (...)

Electronic Elementary Questions :: 10.02.2006 13:31 :: hani51 :: Replies: **4** :: Views: **955**

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 te**rms** of period, frequency and amplitude:
**peak** amplitude, Vp , and

Microcontrollers :: 25.03.2006 14:03 :: silvio :: Replies: **3** :: Views: **2466**

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 (...)

Electronic Elementary Questions :: 15.05.2006 15:04 :: Borber :: Replies: **4** :: Views: **1820**

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

RF, Microwave, Antennas and Optics :: 28.06.2006 19:02 :: Krytar :: Replies: **1** :: Views: **1613**

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

RF, Microwave, Antennas and Optics :: 25.08.2006 07:53 :: flyhigh :: Replies: **9** :: Views: **6094**

But from RF power prespective:
P**rms** ~ (0.1V)^2
P**peak** ~ (0.5V/sqrt(2))^2
-------------
PAR=10*log10{^2 / }
---> PAR= 10.96dB
Hi
This is true:
P**rms** ~ (0.1V)^2
P**peak** ~ (0.5V)^2
-------------
PAR=10*log10{^2 / }=13.96dB

RF, Microwave, Antennas and Optics :: 28.11.2006 12:17 :: hr_rezaee :: Replies: **1** :: Views: **865**

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

Analog Circuit Design :: 06.12.2006 13:07 :: Kral :: Replies: **9** :: Views: **2049**

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

Analog IC Design and Layout :: 28.01.2007 08:03 :: safwatonline :: Replies: **0** :: Views: **568**

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** 2**peak** 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.

Electronic Elementary Questions :: 12.04.2007 13:01 :: quaternion :: Replies: **2** :: Views: **3213**

For the second part
**rms** = **peak**/sqrt(2)
**rms** = **peak**-**peak**/(2√2)
Hope you got it.

Analog Circuit Design :: 09.05.2007 01:55 :: brmadhukar :: Replies: **1** :: Views: **968**

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 (...)

Electronic Elementary Questions :: 31.05.2007 08:35 :: A.Anand Srinivasan :: Replies: **6** :: Views: **3618**

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 (...)

Electronic Elementary Questions :: 31.05.2007 10:34 :: Kral :: Replies: **9** :: Views: **7774**

Could someone please find me a definition?
Is it from time average point of view ?
Or from **rms**/**peak** voltage point of view?
Thanks.

RF, Microwave, Antennas and Optics :: 29.02.2008 03:14 :: passerby :: Replies: **1** :: Views: **834**

Its a simple calculation.
Take the **peak** to **peak** value and divide it by square root of 2. Thats all.
AVR Rulz!!

PC Programming and Interfacing :: 31.05.2008 10:38 :: boseji :: Replies: **2** :: Views: **929**

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 (...)

Electronic Elementary Questions :: 20.10.2008 13:57 :: laktronics :: Replies: **8** :: Views: **1899**

Hi all,
Could you please explain some jitter defiinition definitions.
Suppose that we have a sine wave:
I found this defintions:
Jitter**peak**-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

RF, Microwave, Antennas and Optics :: 06.04.2009 07:34 :: AdvaRes :: Replies: **0** :: Views: **1034**

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
I**rms**: 25A
The problem is, the datasheet doesn't say anything about (...)

Power Electronics :: 07.05.2009 15:37 :: Mercury :: Replies: **4** :: Views: **4845**

Electronic Elementary Questions :: 09.05.2009 07:18 :: trekkytekky :: Replies: **1** :: Views: **2352**

if you remove the rectifier+filter and add some DC bias for the ADC you can also measure the frequency, **peak**, **rms** and mean.

Analog Circuit Design :: 27.05.2009 07:30 :: xvibe :: Replies: **7** :: Views: **4127**

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

Digital communication :: 24.02.2010 09:04 :: raebrm :: Replies: **2** :: Views: **3135**

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 (...)

Electronic Elementary Questions :: 14.04.2010 09:20 :: FvM :: Replies: **28** :: Views: **2754**

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

Show DIY :: 25.01.2011 23:36 :: ckshivaram :: Replies: **2** :: Views: **25496**

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. (...)

Miscellaneous Engineering :: 13.05.2010 06:42 :: gres :: Replies: **0** :: Views: **11783**

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

Show DIY :: 30.05.2010 17:56 :: microsim :: Replies: **1** :: Views: **3113**

if the current is sinusoidal then have a **peak** detector in th sy
and calculate **rms** from **peak**value.
srizbf
25thjune2010

Analog Circuit Design :: 25.06.2010 02:47 :: srizbf :: Replies: **4** :: Views: **758**

For sinusoidal wavefo**rms**, the reference being 0.774V**rms** = 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 (...)

Electronic Elementary Questions :: 27.08.2010 23:32 :: Externet :: Replies: **1** :: Views: **1043**

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

Analog IC Design and Layout :: 08.12.2010 02:18 :: qieda :: Replies: **1** :: Views: **841**

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. V**rms** =

Electronic Elementary Questions :: 24.12.2010 16:34 :: jony130 :: Replies: **8** :: Views: **26497**

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 (...)

Microcontrollers :: 21.02.2011 06:23 :: betwixt :: Replies: **2** :: Views: **919**

can someone help me with a circuit or a part number that converts 220v **peak** to **peak** from a transformer to 310v dc

Hobby Circuits and Small Projects Problems :: 26.04.2011 11:57 :: mazhara :: Replies: **5** :: Views: **2641**

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

Microcontrollers :: 17.05.2011 15:16 :: MARWEN007 :: Replies: **0** :: Views: **1080**

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??

Electronic Elementary Questions :: 10.06.2011 07:26 :: ElectroEnthusiast :: Replies: **6** :: Views: **2442**

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

Mathematics and Physics :: 29.12.2011 14:43 :: zorro :: Replies: **8** :: Views: **8843**

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.

Digital Signal Processing :: 19.05.2012 04:37 :: Luppy :: Replies: **4** :: Views: **495**

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)

Electronic Elementary Questions :: 18.08.2012 11:16 :: treez :: Replies: **6** :: Views: **576**

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?

Analog Circuit Design :: 05.03.2013 05:25 :: Prince Vegeta :: Replies: **1** :: Views: **326**

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

Microcontrollers :: 29.03.2013 08:56 :: Prince Vegeta :: Replies: **4** :: Views: **321**

Hi,
In cadence analog design environment, I'm using caluclator to check **rms** voltage of a circuit.
Does it give v**peak**/squarroot(2) instead of V**peak**-**peak**/squareroot(2)?.
If I plot the power wave and take the **rms** value of it, should I multiply the **rms** power four times?.
Thanks in advance

RF, Microwave, Antennas and Optics :: 12.04.2013 18:21 :: praveen450 :: Replies: **1** :: Views: **325**

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