Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [power-measurement]

87 questions
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5 answers

Why has my tweeter speaker burned up?

I bought a powerful tweeter (or so I thought) to experiment with the ultrasound. The device is quite heavy, and it is rated at "350 watts RMS/700 watts peak": 2'' Titanium Super Tweeter PDBT78 Its nominal impedance is "4-8 ohms" with a frequency…
SlowBot
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Can I measure torque accurately by an electrical or electronic method?

I am a Btech. student from India. We have been given a project in which we have to design a micro-torsion testing device. We are planning to clamp the specimen and rotate one end by fixed angles using a stepper motor while measuring the torque for…
Atharva Kulkarni
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Ways of estimating phase shift

I have a system that's sampling two 50Hz sine waves at 1kHz. What's the best way to estimate the phase shift between the two? The measurements are somewhat noisy and the sampling period is not very even. I know the sample times to a high…
Tom
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4 answers

How to measure micro watts (uW)

In an extreme low power project (MCU+BLE SIP running on a CR2016 battery for year(s)) I would like to measure the power consumption under different environments/algorithms. What would be the correct way or setup to measure micro (nano ??) watts? in…
Gilad
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Measuring relative rf signal strength

I'm trying to measure the relative signal strength received by a dipole antenna for orientation purposes. I'd like to do so using an ordinary multi-meter. I don't know much about RF circuits, but this is the circuit I came up with. I was planning…
user2005848
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Signal power and spectrum analyzer

I want to obtain the signal power in dBm (RMS) as it would be displayed by a power meter using a spectrum analyzer (in my case EXA N9010A). But one thing makes me confused: The spectrum is a plot with frequency on x-axis and y-axis is in dBm. In my…
divB
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Is there an objective standard for power measurement?

Is there an objective standard for power measurement? I've been confused. My background is not in EE, but I've been interested in the ways to measure power. I've learned that there are many different designs. But then I wondered, does some power…
mavavilj
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Can I use a 1-phase analog electric meter rated for 230V to measure 120V current? would my readings be off by a factor of 2? or would it fail?

I am buying some cheap german 1-phase analog electricity meters and plan to use them in Central America. the german meters are rated for 230V and feature the old turning disc mechanism. In central america mains voltage is 120V but you can actually…
quealegriamasalegre
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Current measurement in high side with a range of 200uA and 200mA

I am planning to use the Maxim Current Sense Amplifier(MAX9634HEUK+T)with a gain of 100V/1V implemented as HIGH-SIDE to measure the system current in both normal working mode and sleep mode. I am using a Shunt Resistor of around 1R. In normal…
Adnan
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Generate 1W load on 240V mains to calibrate power meter

I need to measure the accuracy of a mains power meter at around 1W. How can I go about it? Despite being clueless about electronics, I do have some a Tektronix PA1000 Single-Phase Power Analyser that I can use to measure the actual power consumption…
Dan Schien
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What does SWR and reflected power mean in terms of power actually dissipated in a load?

I'm struggling to understand the "meaning" of VSWR in the context of power delivered to a load. Say I have a transmitter operating at 10MHz, a short (~1m) piece of assumed-lossless transmission line, and a load whose impedance is not well-matched to…
Dan
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Measure power of solar cell with an ESP8266

Scenario I plan to buy some bigger solar cells (together around 500 W) and use them to make my electricity bill cheaper. In order to find the perfect location on my roof before the purchase, I thought about placing an ESP8266 on my roof with a small…
Michael Brown
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What is the correct way to measure DC power at the output of a boost converter in a Simulink simulation?

I modeled a DCDC boost converter, and I would like to measure the power at the output of the converter, I do not understand much about simulation times, sampling, and this sort of thing, so I do not know how to properly evaluate the actual output…
SrnLord
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compact headless energy meter

I'm looking for a way to monitor the power of several circuits at home: Washer, dryer, freezer etc. I already have a modbus meter for the heatpump, but I don't have room for an extra meter on the DIN-bar, even if they are available in 1-unit…
Lenne
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Measuring power factor on sinusoids

I'm not sure if this is the best forum for this or whether stackoverflow mightn't be better, but I'll ask here and see what people think. I have a system measuring 50Hz voltage and currents at 1kHz. I'm using quadrature demodulation to measure the…
Tom
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