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185 Threads found on edaboard.com: **Calculate Rms**

I need a simple circuit to **calculate** **rms** value of an ac voltage or any important sites or books

Microcontrollers :: 19.07.2009 20:10 :: dodonet :: Replies: **4** :: Views: **3816**

I want to **calculate** **rms** from isf function in ads how i can this work.

Analog Circuit Design :: 15.06.2010 08:43 :: sadegh.raisi63 :: Replies: **0** :: Views: **555**

Hi all,
Some one have a C code (for embedded) to **calculate** the **rms** value of the sine-wave readed by an ADC of 8 bits?
ThX
NeuralC

PC Programming and Interfacing :: 21.11.2003 08:52 :: neuralc :: Replies: **2** :: Views: **6425**

Hi friends,
can you please tell me how to **calculate** the effective power from an rectangular current and a retangular voltage.
The phase difference between both signals is zero.
May be somebody has some good links for me ?
Thank you very much

Electronic Elementary Questions :: 12.10.2004 04:03 :: Vauxdvihl :: Replies: **2** :: Views: **3256**

I don't understand a formula to **calculate** '**rms**' current stated in "Power System Analysis and Design" by Glover and Sarma. As highlighted by RED color circle in the attached images, pls note that it's I**rms**(t), not I**rms**. Therefore, I call it as 'instantaneous' **rms** current. Pls correct me if I'm wrong. I don't (...)

Electronic Elementary Questions :: 15.02.2006 10:13 :: powersys :: Replies: **4** :: Views: **1570**

Considering how to measure / **calculate** **rms** power in an AC line I've got the concept: The **rms** value results from squaring the values over intervals of time, finding their average value, and taking the square root of it.
Thinking of measuring power used by a common appliance connected to 220 V AC monophasic using a PIC for the measurement a

Microcontrollers :: 23.04.2006 21:02 :: atferrari :: Replies: **2** :: Views: **1937**

Hi everyone,
Does anybody here knows how to **calculate** the **rms** voltage of an OFDM signal? suppose you output an OFDM signal from an DAC and want to measure what is the **rms** value of it. Is the measurement can be done by scope?
Can anyone here give me a reference to article/site that explains the issue.
Regards

Analog IC Design and Layout :: 21.08.2006 22:49 :: Jim cage :: Replies: **1** :: Views: **1255**

The shown waveform isn't the PFC input current, otherwise it wouldn't deserve the name. The high frequency ripple (triangular waveform) has to be absorbed by Cin. According to the required power factor, the input current can't be much higher than the value that you can **calculate** from the nominal load - just the principle of PFC.

Analog Circuit Design :: 23.11.2008 16:09 :: FvM :: Replies: **4** :: Views: **1308**

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

Analog Circuit Design :: 25.06.2010 02:47 :: srizbf :: Replies: **4** :: Views: **791**

Mathematics and Physics :: 20.05.2012 21:20 :: enjunear :: Replies: **4** :: Views: **860**

HI all,
flatulent is right, if you are using MCU, you can get samples and **calculate** **rms**. But d'ont forget of power isolation (secure, etc..), maybe you must use a transformer that can geave you galvanic isolation....
NeuralC

Microcontrollers :: 02.10.2003 12:11 :: neuralc :: Replies: **8** :: Views: **5004**

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: **945**

when the input current is discontinuous, sometimes has oscillation value.
how to **calculate** the effeciency while run simulation, use the average current ,or **rms**, or integrate?
but the three results are not as same as the practical value of test board.
Is there any other method?
My product is Dc to dc chip. while the inductor current is not con

Analog Circuit Design :: 13.11.2004 21:33 :: hawkin :: Replies: **4** :: Views: **914**

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: **2302**

Read carefully page 2 of the document SEM100 DRA4. Based on the **rms** currents of the windings you **calculate** the required wire size.
It should be noted that for switching power supply transformers, the current density is not really that important. What's important is the power dissipation. so you can have current densities much higher than 4.5A

Professional Hardware and Electronics Design :: 17.08.2005 12:30 :: VVV :: Replies: **4** :: Views: **1319**

I'm trying to find the paramaters of an induction motor by applying some tests using 3ph inverter. But i'm confused about some basic te**rms** and calculations about spwm, **rms** values etc. In one of the tests i apply sinusoidal signal to one phase (by this method motor doesn't revolve) and measure voltage and current. Then i **calculate** phase angle (...)

Robotics and Automatics Forum :: 20.08.2005 15:10 :: seyyah :: Replies: **2** :: Views: **2721**

I have got a 12-0-12 transformer that is rated for 5A.
But when I rectified, filtered, and added an LM338 regulator, I get not more than 3A current at 5v.
When I filter the ripple waves, I get a higher voltage ( I have not measured this with a true **rms** meter.)
I **calculate** the transformer to be rated 60W.
But if I get about 18V (on non t

Analog Circuit Design :: 26.11.2005 04:55 :: Lord Loh. :: Replies: **6** :: Views: **1675**

I try to solve the below questions, but the results come out are not correct...Can u guy help me out?....
1)A coil having a reactance of 10 ohms and a resistance of 2 ohm is connected in parallel with capacitive reactance of 10 ohms. If the supply voltage is 200V **calculate**:
a) the reactive power absorbed by the coil
b)the reactive power gerner

Electronic Elementary Questions :: 08.02.2006 00:01 :: muaythai2006 :: Replies: **4** :: Views: **983**

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: **2543**

How to **calculate** the DC current a transformerless power supply can source?
Thanks

Analog Circuit Design :: 08.04.2006 09:14 :: Nicholas :: Replies: **8** :: Views: **1425**

hi,
Can i **calculate** the bit error rate just from the eye diagram?
thanks a lot
arsenal

RF, Microwave, Antennas and Optics :: 12.05.2006 18:53 :: arsenal :: Replies: **10** :: Views: **4318**

I want to analysis the power dissipation of a switched power supply circuit using Hspice.
I have some problems:
1. For the input voltage source, the current flow through it is not a constant.
Shoud I use voltage* **rms** current or voltage*average current or some other method to **calculate** the power dissipation of the input source?
2. For the switc

Analog IC Design and Layout :: 30.05.2006 16:00 :: leonken :: Replies: **4** :: Views: **3713**

hi
Analog Divece ? have a special 8pin Ic for this purpose.
And for fully sine wave you can **calculate** this by two samples.
V1=Vm sin(t1)
V2=Vm sin(t1+90)
Vm?=V1?+V2?
V**rms**=√? Vm

Microcontrollers :: 09.08.2006 06:00 :: smxx :: Replies: **2** :: Views: **1052**

Hi everyone,
Does anybody here knows how to **calculate** the **rms** voltage of an OFDM signal? suppose you output an OFDM signal from an DAC and want to measure what is the **rms** value of it. Is the measurement can be done by scope?
Can anyone here give me a reference to article/site that explains the issue.
Regards

RF, Microwave, Antennas and Optics :: 21.08.2006 19:33 :: Jim cage :: Replies: **0** :: Views: **788**

hello,
I have accelaration signal and i want to **calculate** narrow-band and broadband velocity **rms**.
can any buddy help something about it.
how to implement
wats the formulla
regards

Digital Signal Processing :: 12.10.2006 04:27 :: naresh850 :: Replies: **0** :: Views: **488**

By definition the **rms** value of a periodic signal x(t) with period T is the following:
\sqrt{\frac{1}{T}\int_{t_o}^{t_o+T} x^2(t) dt}
In your case, T=1, and you can simply allow t_o=0 and integrate the square of your expression from 0 to 1.
The above formula is totally correct. However in a simple c

Electronic Elementary Questions :: 10.01.2007 08:26 :: The Joy of Electronics :: Replies: **5** :: Views: **1630**

rajeshks,
Audio amplifier manufacturers routinely (and incorrectly) refer to "**rms** power". While "**rms** power" can be **calculate**d, it has no useful physical meaning. The correct term is "Average Power". For a sine wave voltage into a resistive load, the Peak power is twice the average power.
Regards,
Kral

Electronic Elementary Questions :: 31.05.2007 10:39 :: Kral :: Replies: **6** :: Views: **3743**

how do you **calculate** electromigration? how to avoid it?
thanks

Analog IC Design and Layout :: 30.07.2007 22:50 :: protonixs :: Replies: **9** :: Views: **2008**

How do you do,
I don't speak very well english.
How can **calculate** dimension from design speaker ? I want this teory from my university project. The project speaker i want to include formula, schematics.... Please help me. I want design speaker, **calculate** dimension from speaker 100w**rms**: how **calculate** diameter magnet for (...)

Electronic Elementary Questions :: 12.08.2007 13:59 :: mr_music :: Replies: **4** :: Views: **845**

I have **rms** jitter specification for a pll. what actually this refers to?
Is this random jitter?
If we do the phase noise simulation and **calculate** jitter value, what jitter we get?

Analog Circuit Design :: 18.09.2007 02:48 :: satyasiva :: Replies: **2** :: Views: **1305**

Electronic Elementary Questions :: 14.11.2007 05:50 :: rkodaira :: Replies: **4** :: Views: **4731**

Hi,
Normal multimeters assume the input to be a sine wave and **calculate**s **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: **1952**

Hi !
Can someone tell me how to **calculate** the amount of on-chip
Decoupling caps required for a mixed signal block like DAC and
ADC.
TIA
Ragduga

Analog IC Design and Layout :: 15.01.2009 07:01 :: raduga_in :: Replies: **3** :: Views: **998**

The **rms** of a waveform is the square root of the mean of the read value squared, or more simply, the area under the function signal divided by time taken for reading. This is easiest found by calculus.
Each wave will generate a different formula because the input function is a different formula - from the simple PWM square wave to complex multipl

Microcontrollers :: 21.04.2009 07:19 :: trekkytekky :: Replies: **3** :: Views: **6198**

Thanks!
One more thing. I'm having problems with the calculating Volt-uSec product for the current transformer.
I need to put a current transformer do I **calculate** it?
Thank you again!
George

Power Electronics :: 08.05.2009 02:18 :: Mercury :: Replies: **4** :: Views: **4966**

How to **calculate** the trace width for a timed DC supply?
Ex:
How to **calculate** the trace width for 8A current signal for 8ms timed?

PCB Routing Schematic Layout software and Simulation :: 08.05.2009 05:54 :: sivaramanmv :: Replies: **2** :: Views: **1259**

because it is of more use than the peak, Most of the cases **rms** valus is of use thatn the peak.
**rms** is the effective voltage ...
u can **calculate** peak from **rms** if u require taht .

Embedded Systems and Real-Time OS :: 22.05.2009 06:22 :: BABESH :: Replies: **2** :: Views: **1172**

In the general case (arbitrary source voltage and current) the product of instantaneous voltage and current as to be averaged to **calculate** the power flowing out of/into the source.
P(t) = V(t)*I(t), Pavg = |V(t)*I(t)|
For V = const, the expression simplifies to
P(t) = V*I(t), Pavg = V*|I(t)|
**rms** values aren't involved

Power Electronics :: 15.05.2009 10:57 :: FvM :: Replies: **2** :: Views: **1045**

There are at least two aspects: Maximum current capacity of a trace respectively overtemperature and acceptable resistance respectively voltage drop. In low voltage circuits, the second is usually defining the trace widths.
I suggest to **calculate** the trace resistances. In your example it's already 8 mohm with a 1 oz (35 ?m) copper PCB, quite a l

Power Electronics :: 12.06.2009 02:27 :: FvM :: Replies: **2** :: Views: **1480**

im reading the voltage registers but how to match those values with the input voltage given.because what we are reading in these registers are **rms** should we **calculate** **rms** value for the inputs we give and then check them with what we read in these **rms** registers?
and it is given in the formulas mentioned in calibration (...)

Robotics and Automatics Forum :: 27.07.2009 12:23 :: chinuu :: Replies: **2** :: Views: **2025**

I am designing a PFC circuit using the L6561. In the page 9 of the application note AN966( ) , there is a fomula to **calculate** the total **rms** capacitor ripple current IC**rms**. Does anyone can tell me how to derive this ripple

Power Electronics :: 07.04.2010 23:58 :: billwangtw2001 :: Replies: **0** :: Views: **696**

I am making a single phase inverter with pwm frequency of 7.8khz from a 24 volt battery and variable modulation index which is then step up using a 24/225 v transformer. the output of the transformer is fairly sinusoidal (filtered by leakage inductance) while that of the H-bridge is square wave pwm type(low voltage side).
how do i measure the

RF, Microwave, Antennas and Optics :: 02.06.2010 18:19 :: isfandhassan :: Replies: **0** :: Views: **1998**

Search about sin wave generator.
There are so many method to generate a sin wave include high frequency.
also, you can **calculate** the amplitude using retifiter and integratos circuit by **calculate** **rms** value.
however i strongly recommend you to use oscilloscope!

Analog Circuit Design :: 11.07.2010 17:53 :: SeungminLee :: Replies: **1** :: Views: **1131**

"The effective noise bandwidth (ENB) is a property for a filter circuit and not for an opamp alone."
Then, how can I **calculate** the ENB of op-amp?
how can I simulate the input referred **rms** noise of op-amp in h-spice?

Analog Circuit Design :: 15.07.2010 07:11 :: fsunken :: Replies: **0** :: Views: **988**

as the picture,the current wave CCM and DCM,how to **calculate** the avg,**rms** ?
(mosfet and diode's avg,**rms**)
thanks !

Power Electronics :: 19.07.2010 10:08 :: wei9321 :: Replies: **0** :: Views: **891**

You can't **calculate** jitter for individual blocks. Only device noise can be **calculate**d.

Analog Circuit Design :: 06.03.2011 00:14 :: leo_o2 :: Replies: **5** :: Views: **916**

I have an urgent query please do help me...I am only a beginner in MATLAB...I have a signal that has fs=1000. Its an ECG signal and has 80 leads. I have to **calculate** the **rms** of it. When I used the code stated above MATLAB says that Subscript indices must either be real positive integers or logicals..Eagerly waiting for any reply. The factors presen

Digital Signal Processing :: 19.08.2011 06:30 :: alvinsam :: Replies: **0** :: Views: **653**

Hi guys,
Does anybody know how to **calculate** FSK error? I mean modulation accuracy of GFSK signal. The profile of GFSK I generated is
modulation index = 0.5;
data rate = 500kHz;
frequency deviation = 125kHz;
I have measured the signal with Agilent VSA. The FSK err is about 2.8% **rms**. But I want to know the calculation process behind this

RF, Microwave, Antennas and Optics :: 17.11.2011 04:28 :: jochen :: Replies: **0** :: Views: **736**

i know excel but these values in log magnitude values

RF, Microwave, Antennas and Optics :: 18.02.2012 10:18 :: veerababuj :: Replies: **2** :: Views: **370**

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