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1000 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 :: 07-19-2009 20:10 :: dodonet :: Replies: **4** :: Views: **3911**

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

Analog Circuit Design :: 06-15-2010 08:43 :: sadegh.raisi63 :: Replies: **0** :: Views: **575**

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 :: 11-21-2003 08:52 :: neuralc :: Replies: **2** :: Views: **6710**

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 :: 10-12-2004 04:03 :: Vauxdvihl :: Replies: **2** :: Views: **3370**

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 :: 02-15-2006 10:13 :: powersys :: Replies: **4** :: Views: **1641**

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 :: 04-23-2006 21:02 :: atferrari :: Replies: **2** :: Views: **1998**

You can use DAC input (digital input) instead of analog output. You can **calculate** **rms** from digital input using a microcontroller of FPGA.

Analog IC Design and Layout :: 08-22-2006 13:10 :: leotim :: Replies: **1** :: Views: **1297**

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 :: 11-23-2008 16:09 :: FvM :: Replies: **4** :: Views: **1341**

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

Analog Circuit Design :: 06-25-2010 02:47 :: srizbf :: Replies: **4** :: Views: **821**

Mathematics and Physics :: 05-20-2012 21:20 :: enjunear :: Replies: **4** :: Views: **940**

But smijesh said we need to **calculate** **rms** voltage for pulsating dc.
I don't know if you need to **calculate** it, but you did it right. I ignore the unrelated,meaningless or erroneous columns like "maximum power" and "activation time".

Electronic Elementary Questions :: 02-04-2014 05:41 :: FvM :: Replies: **8** :: Views: **342**

i want to **calculate** **rms** values of some signals.
x**rms** = sqrt{ 1/n*( x_1^2 + x_2^2 + ...... + x_n^2 ) }.
but the problem is sqrt operation. i have used cordac but it does not gives precise values u can either give integers or fractions. I have also tried sqrt function from fixed_alg_ug pkg but its not synthesizable because it depends on (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-25-2014 02:12 :: habbas33 :: Replies: **5** :: Views: **264**

i am using pic184520 ic it has 10bit adc. In my project i am measuring line voltage using step down transformer, the input of the transformer is 230v 50hz ac and output is 5v ac, my doubt is can i give the ac 5v directly to adc pin and ground are i must use any diode. my next doubt is how to **calculate** **rms** of sine wave i am using pic ccs compiler, p

PC Programming and Interfacing :: 06-10-2014 11:48 :: raman00084 :: Replies: **2** :: Views: **541**

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 :: 10-02-2003 12:11 :: neuralc :: Replies: **8** :: Views: **5073**

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 Automation Forum :: 07-27-2009 12:23 :: chinuu :: Replies: **2** :: Views: **2076**

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 :: 07-11-2010 17:53 :: SeungminLee :: Replies: **1** :: Views: **1167**

i know excel but these values in log magnitude values

RF, Microwave, Antennas and Optics :: 02-18-2012 10:18 :: veerababuj :: Replies: **2** :: Views: **421**

I want to measure voltage (and **calculate** **rms** value of it) using loc110. I'm referencing to this difference is i will measure a single phase 230V AC.
I want to ask a few questions who have knowledge about this:
1- Do i need to rectify AC input?
2- What happ

Hobby Circuits and Small Projects Problems :: 05-05-2012 04:55 :: seyyah :: Replies: **1** :: Views: **1052**

Hi everyone.
I'm measuring 2 AC sources - 50Hz 230v **rms**.
I read this subject about offsetting AC voltage to make it 0-5v DC one to get it in the ADC pin of PIC MCU for measuring it.
I have some questions after that:
1- How can I **calculate** **rms** value of the signal?
I need code example of th

Microcontrollers :: 02-21-2013 18:27 :: Prince Vegeta :: Replies: **2** :: Views: **951**

One way of doing that would be to **calculate** the **rms**. Another way, perhaps less time consuming would be to divide the energy dissipated by the time period. See the attachment below
(Note that the definition of current in the attachment holds only for the first time period, but it is sufficient to **calculate** power from this, since current is a (...)

Education :: 06-24-2014 13:08 :: mrinalmani :: Replies: **4** :: Views: **439**

Thanks for your replies.
Actually, this is used to **calculate** **rms** volatge of AC Signal signal is applied to a Fully Differential Isolated Amplifier IC such as AMC1200, and the output is taken on ADC pin of micro-controller.
But there are no negartive values in ADC measurement.
Can you please elaborate, i think i am quite close.

Electronic Elementary Questions :: 10-14-2014 00:57 :: xpress_embedo :: Replies: **9** :: Views: **472**

The circuit can't actually monitor insulation faults, respectively can only under the assumption of balanced motor currents.
IY can be **calculate**d as -IB-IR (for the instantaneous value, not averaged value). But the calculation is only valid if not ground current exists. In contrast, to monitor ground currents, you'll use a current sensor around

Electronic Elementary Questions :: 11-25-2014 09:17 :: FvM :: Replies: **4** :: Views: **314**

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 :: 03-25-2006 14:03 :: silvio :: Replies: **3** :: Views: **2616**

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 :: 08-21-2006 19:33 :: Jim cage :: Replies: **0** :: Views: **874**

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 :: 10-12-2006 04:27 :: naresh850 :: Replies: **0** :: Views: **508**

I cant seem to find any information on how to do this problem,
For a 16 QAM mod signal how do i **calculate** EVM and MER if the noise in the signal has an **rms** value of 0.4 and the phasor amplitude is 8v?

RF, Microwave, Antennas and Optics :: 08-28-2012 11:15 :: davuel :: Replies: **3** :: Views: **724**

Hi all,
During EM checks we determine how many vias are required based on average current density divided the current limit per via.
Why are we using average current density to find the number if vias to pass EM?
Why dont we use **rms** current to **calculate** the number of vias required?
Dont we expect joule heating in vias?
Please clarify

ASIC Design Methodologies and Tools (Digital) :: 12-04-2012 12:21 :: muthu21888 :: Replies: **1** :: Views: **510**

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 :: 08-31-2004 13:25 :: flatulent :: Replies: **3** :: Views: **976**

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 :: 11-13-2004 21:33 :: hawkin :: Replies: **4** :: Views: **956**

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

Professional Hardware and Electronics Design :: 06-08-2005 02:39 :: cqjhq :: Replies: **4** :: Views: **2338**

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 :: 08-17-2005 12:30 :: VVV :: Replies: **4** :: Views: **1363**

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 Automation Forum :: 08-20-2005 15:10 :: seyyah :: Replies: **2** :: Views: **2774**

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 :: 11-26-2005 04:55 :: Lord Loh. :: Replies: **6** :: Views: **1811**

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 :: 02-08-2006 00:01 :: muaythai2006 :: Replies: **4** :: Views: **1120**

Above calculation is wrong. Circuit shows that rectification is half wave. So for average current of 100mA you must multiply 100mA*pi to get peak value of current. Then multiply it with 0.707 to get **rms** value. Now you can **calculate** the capacitor:
C=1/(220/(0.100*pi*0.707)*314)=3.2uF
You may choose capacitor.
Zener diode must be rate

Analog Circuit Design :: 04-09-2006 04:15 :: Borber :: Replies: **8** :: Views: **1462**

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

RF, Microwave, Antennas and Optics :: 05-12-2006 18:53 :: arsenal :: Replies: **10** :: Views: **4499**

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 :: 05-30-2006 16:00 :: leonken :: Replies: **4** :: Views: **3883**

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 :: 08-09-2006 06:00 :: smxx :: Replies: **2** :: Views: **1080**

The above formula is totally correct. However in a simple case as urs U can **calculate** the **rms** value by multiplying the sine and cosine amplitudes by √2/2 and suming over the te**rms**. Namely:
(√2/2)×Σ(sine or cosine amplitude)
Regards
I don't think you can just sum the t

Electronic Elementary Questions :: 01-10-2007 16:46 :: v_c :: Replies: **5** :: Views: **1815**

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 no devic

Electronic Elementary Questions :: 05-31-2007 08:35 :: A.Anand Srinivasan :: Replies: **6** :: Views: **3863**

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 :: 09-18-2007 02:48 :: satyasiva :: Replies: **2** :: Views: **1362**

Electronic Elementary Questions :: 11-14-2007 05:50 :: rkodaira :: Replies: **4** :: Views: **5288**

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 :: 10-20-2008 13:57 :: laktronics :: Replies: **8** :: Views: **2005**

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 :: 01-15-2009 07:01 :: raduga_in :: Replies: **3** :: Views: **1024**

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 :: 04-21-2009 07:19 :: trekkytekky :: Replies: **3** :: Views: **6479**

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 :: 05-08-2009 02:18 :: Mercury :: Replies: **4** :: Views: **5094**

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 :: 05-08-2009 05:54 :: sivaramanmv :: Replies: **2** :: Views: **1290**

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 :: 05-22-2009 06:22 :: BABESH :: Replies: **2** :: Views: **1196**

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 :: 05-15-2009 10:57 :: FvM :: Replies: **2** :: Views: **1078**

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 :: 06-12-2009 02:27 :: FvM :: Replies: **2** :: Views: **1513**

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