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# Peak Rms

142 Threads found on edaboard.com: Peak Rms

## [Power] 1000 watt home inverer High Output Voltage Problem.

This inverter probably was designed to operate with a minimal load so that it is expected to drop a few the output voltage. Make a test to check if the 285v decreases with a load of about 10% of the rated value. Is this voltage obtained using a peak or rms scale ?

## How do I change DC motor's direction without burning it ?

The surge current when the motor's magnetics have risen to peak current is limited by the V+/Rs for a winding resistance , Rs . Current starts at 0 when V is applied, reaches a peak and when rotational speed picks up speed, the back EMF generated reduces the current drawn. This surge current is typically 8x max rms rating and the time (...)

## Which circuit is good to measure the current??

1) If the input is a sinewave then 20A rms produces a peak current of 28.28A. Then the peak voltage across the 10 ohms current sensing resistor is 282.8V which is ridiculous. 2) The opamp will not work because it has no part number and it is not powered. 3) The opamp also will not work because its (+) input does not have a DC reference (...)

## Oscilloscope Probe Maimum input voltage clarification

Hi all; Please i need a very good clarification in regards to the maximum input voltage of an osscilloscope. i just bought one the Rigol1074z which came with the Rigol 2200 probe. the datasheet says at 10x maximum input voltage is 300ACV but i am not really cleared about this if it is rms, peak or peak to peak (...)

## voltage and current measurement using atmega controller

C dividers are safer at high voltage and lossless. then decide if delta or Y I sensors may be expensive CT or cheap but custom Hall sensors then scale to your ADC range , add filters and decide if you want Vavg or V pk or true rms and convert accordingly Decide on range, accuracy, and metrics 1st eg. mean, std dev, peak , transient pk, V-sec o

## Voltage divider circuit to measure 440v AC supply using ATMEGA8

If that's 440V down to 5V rms the peak will be (5 * 1.414) - (2 * Vf) or about 5.8V DC assuming you have added a reservoir capacitor. So to drop it to 2.56 you need a resistive divider with a series to parallel ratio of 1:1.264 You could use a series resistor of 13K and a parallel resistor across the ADC input of 10K. It would be wise to add prote

## Perpetual motion transformer

1) No such thing exists as a Perpetual Motion transformer, power supply or anything over unity in energy ( except in fairy tales and bad measurements by Test Engineering standards) 2) Nowhere is it stated the output is Sinusoidal or even constant rms voltage under load. In fact the peak to rms ( open circuit) voltage is a clue it is n

## Sine wave generator in proteus

I wish to know how to setup 230v source from proteus "Generators " - SINE. I worked with dc well. now when I click SINE there are three fields to fill. (I need 230 v ac, 50 hz and also to work with PIC I need 2.30v , 50hz source) 1.offset ? 2. amplitude/peak/rms ? 3. Frequency (I think this is 50hz); VSINE also works the same way w

## Diode-rectifier circuit problem???

No, the diode will fail. The parameter you need to observe is 'PIV' or peak Inverse Voltage. The 220V rms will be swinging between about +250V and -250V at it's peaks. If the rectifier is driving a load that does not store any voltage you need diodes rated at a minimum of 250V. If the rectifier has storage after it, for example a (...)

## RMS vlaue of fundamental (100Hz) current in offline, PFC'd flyback output diode?

An "Ideal" sawtooth of amplitude A peak-peak has an rms value Vrms= 2A√3 But your waveform is zero for ~10% of the time, so it will be 10% less.

## measure a voltage ripple for non-periodic signal

If this ripple is not periodic, you can use a modern oscilloscope that has a recording capability.The oscilloscope will record this non-periodic waveform in a long term time slot and you will able to measure peak-to-peak ( or avarage,rms etc).

## Rated current is peak current are rms current

My motor rated current is 3a found in name plate it is rms current are peak current regards kalyan This is thermally rated for rms, whereas peak current will depend on load, acceleration and Coil resistance, Rs. *Added 5x .. Depends on winding resistance Often this is 5x-8x steady rated current

## Is RCS of a target dependent on Pulse Width used in a Radar System?

Its a bandwidth thing, with CW you have a DC level, with a pulse, you have not, so if its a proper rms detector then the output is down by the mark/space ratio. If its peak measuring (rms calibrated) then it should be OK, providing the circuits have a wide enough bandwidth to handle the narrow pulse width. Frank

## Phase Angle Meter is RMS or Peak?

A phase angle meter has a Total button and a In-Phase Button The Total Button measures in rms and is the same AC measurement as a DVM meter in AC mode? The In-Phase measures in rms or peak? The In-Phase measures the input voltage in phase with a reference input voltage of the same frequency The Polarity and Magnitude is (...)

## Digital Multimeter Shows Amplitude of Voltage or Peak-to-peak Voltage

hi, Most AC meters are scaled in rms, which is 0.707 * Vpeak. E

## Amplify an analog signal

2A peak into 8 ohms is 1.414A rms which produces an output of 16W into 8 ohms. The voltage swing is 11.3V rms or 16V peak. Phase delay might be a problem at 20kHz if the frequency of the LC lowpass filter at the output has a cutoff close to 20kHz and you use negative feedback from the speaker to the input.

## Capacitor Specification

The voltage rating for a capacitor is its maximum allowed peak DC, which is 1.414 times higher than its sinewave rms maximum voltage rating. So if the voltage to a capacitor is 25VAC then the capacitor must have a voltage rating of at least 35V and a 100V capacitor can be used for good reliability. Note that some types of capacitors are polarized a

## rms measurement of frequency varying sine signal

Unless there you don't mind measuring Signal + Noise, the appropriate method is to convert peak to rms assuming Sine wave and rms=peak/Root(2) or 0.707 x Vp as Audioguru stated. If you want to eliminate noise, then a tracking filter is needed.

## Crest Factor for FM signal???

If crest factor depends by modulation (peak and removed modulation) how can people spent time defining crest factor for un-modulated signals as: sine, square, triangle? Above is mentioned that: Crest factor is the peak amplitude of the waveform divided by the rms value of the waveform. You mentioned 6d

## Best way to build a voltage controlled current source

To deliver 100mA into 100Kohm you need 10000volts and an output power of 1000 watts. That is rms so for a sinusoidal signal you need 14000volts peak, positive and negative. Even 100mA into 1Kohm needs 100volts rms, 140v peak Give a realistic specification for output current and load impedance. Lower maximum current, (...)

## how to calculate rms voltage of sine wave using 10 bit acd

If you connect one leg of the transformer secondary to ground, then you can apply the other leg to the ADC input; BUT you will need to drop the voltage, since the peak voltage will be over 14 volts (5 volts rms is about 14 volts peak-to-peak). You can determine what the peak value of the signal is, and (...)

## High Voltage Fan Control + High Voltage Surge

Hello, I'm building a Fan Control Circuit for controlling the speed of a 380V Fan.(380V rms, ~540V peak-max 150W) using a microcontroller. My main circuit is something similar to this FreeScale Application note : In my circuit, I have a different microcontroller, Op

## peak to peak voltage ripples

peak ripple would of course be (Max-min)/2 which is closer to rms noise, but depends on if your interest is thermal noise, clock feedthru or some other noise in the signal. Normally if it is fundamental f or 2f , we call it ripple, otherwise just "noise p-p" covers all types including transient noise.

## Signal conditioning for ADC @ 220VAV input

. It depends on your sampling rate. ADC is linear but your detector is not. Do you want to only track changes in Vac over long term or short term interruptions or do statistics Avearage & deviations ? Choices: quasi rms with peak, P-p or rectified average I would use LPF Noise filter and rectified average with another LPF. 200Hz LPF before br

## Convert Ac to Dc output voltage

It doesn't increase - it decreases by the voltage dropped across two of the bridge diodes. The reason you get the apparent increase is because if you fit a reservoir capacitor after the bridge it charges to the peak of the rectified half cycles. If you are using a capacitor, the voltage across it will rise to the rms voltage multiplied by sqrt(2) t

## Getting peak value of the input at rectifier output

As you know that 220V is basically rms voltage , so in order to get the peak voltage , you have to rectify it (bridge rectifier) followed by a filter stage , which incorporates a inductor and capacitor , or simply a capacitor the output voltage would be 220*root2 = 311v, if you use a large capacitor , the DC waveform would be more smoothen.

## Need for an accuarate Peak/Amplitude detector

Hi folks, I designed a signal amplifier and need to measure the amplitude of the output accurately (less that %5 error) to be independent of oscilloscopes. Since output signal has some sort of distortion, especially at high frequencies, the idea of using rms converters is useless. Furthermore, I tried to simulate other ideas based on fast ECL co

## Measuring output Wattage, power amp only VS preamp + power amp

The 200W total is probably the power supply power to the amplifier that causes the output plus heat. 44V peak-to-peak is 15.6V rms. Then the output power is 15.6V squared/8= 30.4 Watts. Amplifier power is measured with a sinewave. If a square-wave is used then the output power is doubled (60.8W for this amplifier) because an additional (...)

## how to improve SFDR of an amplifier

-105dB is almost 0.0005% and that is just the peak. The rms value of the distortion will be less. Some very good audio opamps have harmonic distortion at 1kHz of 0.00008% but with a 2k ohm load, a gain of 1 and an output level of 1vp-p. You might be able to hear 0.1% distortion at 1kHz.

## Speicification of Speaker

A good speaker has a continuous rms power rating and a much higher momentary peak power rating. Cheap speakers have lies instead of true power ratings.

## Understanding an audio amplifier design

With a 15V supply and a 4 ohm speaker, the original circuit would have an output of about 11V p-p which is 3.9V rms which is only 3.8W. The peak current in the output transistors is 1.38A. The darlington output transistors have a current gain of typically 3000 so the drive current into them is fine. Since there is only two diodes to bias the (...)

## Direct Digital Synthesizer

I see what u mean, the data sheet is sparse on output power info. it does say that full scale current output is 20.48 ma, and the output impedance is 50 ohms. That leads me to think that the peak output power would be at +/- 10.24 mA into 50 ohms. Poutpk=I^2*R=7.688 milliwatts peak, or 5.4 milliwatts rms. So practically, I would expect (...)

## power is measure of?

rms is the voltage that has power. A peak may be of a high voltage with a high instantaneous power but a low power in the real sense of the word. Any meter that claims to read power must detect the rms voltage and current. otherwise the meter should be a peak power meter. Frank

## crest factor in inverter

Hi, Crest Factor = peak Current / rms Current. In a linear load, the Crest Factor is 1.414. However, in a general purpose SMPS, due to its non linear nature, this factor will be much higher - in the region of up to 4. See if you can measure the current using a CRO/DSO by putting a small resistor but having higher wattage in line. Then measure vol

## Amplifier - Cant drive out full power

There is real power and 'market hype' power. What you are trying to measure is continuous rms Watts but the specification may be for "peak music power" or similar. For example, my desktop speakers here each have a single 10cm loudspeakers in them, the back of the speaker is marked 8 Ohms 5W but the outside (...)

## AC main voltage measurement

Obviously, an active "precision" rectifier will be required. Different AC quantities are available, averaged rectified value, peak value, rms value. Averaged rectified value is giving best results if no true rms circuit is required.

## How do I amplify the output voltage from function generator

Just some basic estimating.. 50v peak-to peak is 25V base to peak, and staying with 50 Ohms for now.. Then, for sine waves, the rms voltage is 25/SQRT(2) = 17.67 Volts, and Power = V^2/50 = 6.25 Watts For the other extreme, a square-wave of (say) 90% on, 10% off comes to 11.25 Watts. peak power is (...)

## Test signal of CW in NXP datasheet....absolute peak power or RMS power?

In NXP datasheets, it specifies test signals as CW, 2-tone or WCDMA. For the CW test signal, is this an absolute peak power, or an rms power?

## stepping down 300v ac

"I want to stepdown 300Vac 50hz to 5v(peak)", 5V peak is 3.5V rms. 220 to 12 V is not a good place to start from. Ignoring any transformer problems, you would get 300/250 X 12 = 14.4 V when you need 3.5, so you will have 4 times as many volts as required!!! If the 3.5V is going to feed a FIXED load (er, LED perhaps?) then a simple series (...)

## Basic Test Technician Math

What are some basic power supply electronic math formulas that a test technician should know? 120AC input - 1.141 = 118 VDC The 1.141 is the full wave bridge rectifier One of my managers use to use these other formulas but I'm not sure if they are correct or have to get them How to get the DC power supply output voltage He would

## Can I Correlate This Spice Total Noise to My Actual Oscilloscope Observation?

I used TINA-TI to model a circuit and it predicted a Total Noise that is negligible below 300 KHz and flattens out at 300 mV above 60 MHz. I built the circuit and want to correlate what I see on my scope with what the model predicted. My analog scope has a 250 MHz bandwidth so I believe it should have negligible effect on the readings. Wit

## measure mains voltage on single cycle

Use an A/D converter or a peak detector.

## Pure Sine wave inverter microprocessor based and transformerless

I am designing an inverter for a diy project. This inverter should be transformer-less and microprocessor based. I am planning to use a DC-DC converter, but should i used a the peak voltage or the rms for the DC-DC output, and how do i configure the circuit to handle the power i have in mind? How could I limit the device to....say 250W , with a 24v

## High voltage problem with lead acid battery charger

36V is the rms voltage of the transformer. Not the DC voltage you get after rectification. For a sinusoidal waveform, rms can be converted to its peak value by multiplying by 1.41, so 50V is about right. It will likely be higher even than 50V because the transformer will be rated to give 36Vrms at its maximum current. (...)

## Sizing three phase inverter's IGBT

Hi to everyone, I'm working on a three phase sinewave converter project for a 3 kW squirrel cage motor (230/400 V AC). The converter's topology I have to realize is shown in the simplified scheme in the attachment. I've some doubts about the right selection of IGBT's current ratings. Assuming for the motor a power factor cosφ = 0.8, I determ

## VAC to dbm conversion in RF mixer

If it is a peak value, P = V^2/2R = 1^2/100 = 0.01W = 10mW 10mW = 10*mW As we have powers, convert "10" to dB via 10*log10 = 10*1 = "10dB" 10 mW = 10dB*mW. As we are lazy sometimes, we write this mostly as 10 dBm. When it is an rms value, the power V^2/R = 0.02W = 20mW, converting "20" to dBs gives "13dB", so together with the mW:

## Universal Power Supply - Silicon Chip

But what's with the 36V? The wall plug gives 24V rms, so the peak voltage should be 24 * sqrt(2) = 34V. There's a bit of voltage lost across the diodes, so you should get about +-33.4V DC unregulated. So it's only 6% higher than expected. Two possible reasons: With light loads, a transformer's output

## How to check SIDAC K300????

Hi Sir, Can u please give me the circuit diagram of SIDAC testing..... I am giving the following details of SIDAC Its name is SIDAC K-300 Silicon Bilateral Voltage Triggered Switch Breakover Voltage- minimum 270V and maximum 330V Blocking Voltage- 215V peak off-state current at VDRM- 10uA Continuous On-state DC or rms Current- 1A Holding cu

## Practical usage of Current Transformers (Simple circuit or dedicated IC)

I know Current Transformers have been discussed here before but i have a slightly different angle that i cant find the answer too, I am currently desiging a circuit to measure current from say 0-30A, I have the current transformer, load resistor etc and that is all ok, I intend to feed the variable DC output into a Micro and use AD converters in

## Help Gain Calculation

Hi all! I know voltage gain is given as Vout/Vin...I want to know that whether the values of voltages used for this calculation are rms or peak to peak? Thanks in advance!