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Questions tagged [power-meter]

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35 views

How Power measured by Meters is affected by Harmonics?

I want to know how energy meters (Electro-static or electronic) measure Energy (let's assume power, ignore time) when there are harmonics present. I know what are harmonics, how are they generated ...
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1answer
129 views

DDS238 AC Power Meter: how to calculate current power consumption using pulses

I have a DDS238 AC power meter with 2000 pulses/KWh (1p/0.5Wh) and I want to calculate the real-time power consumption and play an alarm if the value exceed a specific value. I'm using an ESP8266 by ...
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1answer
35 views

RF Power Meter vs RF Power Sensor

What is the difference between a power meter and a power sensor? If I got this right a power meter is the instrument that reads and displays the measurements of the power sensor. Also, power meters ...
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1answer
118 views

Safety precautions when developing and testing mains voltage devices [closed]

Specifically, I am planning to design and build an energy meter to measure power drawn from mains - 120V 60Hz. What are the risks associated with developing and testing this device and how to minimize/...
2
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1answer
88 views

ATM90E32 total energy reading

I'm developing a simple power meter using the ATM90E32 from Microchip. For now, I can read all values: frequency, power factor, voltages, apparent power, etc. Now the issue is with the energy, I need ...
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2answers
201 views

Whats the purpose of 0R in Sonoff POW [duplicate]

I'm designing my own Sonoff with ESP32, with power monitoring capability. Now before I start my own design, I took a look at Sonoff design. In the Sonoff POW the power metering IC has a 0R resistor, ...
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0answers
84 views

How make a pulse acquisition from an electrical meter directly into a raspberry pi?

I would like to acquire pulse informations from a french electrical meter. There is a picture of the outputs of this electrical meter. These pulses vary in frequency and after acquisition, we can ...
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2answers
64 views

Fake energy saver inductive loads

I watched this video on YouTube, it covered fake energy saving devices. I have seen many of these fake devices and they all seem to use a capacitor. My question is why would they bother? The person ...
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0answers
53 views

How to have Wye-connected Potential Transformers(PTs) and Neutral Ground Resistor short circuit detection at my ground fault protection relay?

Detecting if the Neutral Ground Resistor (NGR) is shorted is something that must be checked at the Ground Fault Protecting Relay. The typical way to do this is to inject a DC component and to measure ...
0
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1answer
60 views

What is the 'right' way for a 3-Phase Watt Meter to determine import-export Watt-hours?

What is the correct way for a 3 Phase Watt-Hour meter to measure total import/export watt-hours? I ask because I have seen this done in 2 different ways both in 'approved' meters: Assume that: Red ...
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1answer
245 views

How does a Hall-based wattmeter work?

I read about the Hall effect and understand its usage in sensors like speedometers, but I also read it can be used as a wattmeter. How can it happen? In order to calculate power (P) we need to ...
0
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1answer
80 views

3 Phase Energy Meter to measure multi channel

Can I use single 3-phase energy meter to measure multiple 3 phase load using multiplexing relays for the CT outputs? For example like below picture. The intention is to log data for multiple 3-phase ...
2
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0answers
111 views

RS485 registers for calculating total power consumption (kwh)

I have an energy meter (OHIO A2000) which has been now discontinued by the manufacturer. Anyway, I'm following the manual for extracting energy parameters through Modbus RS485 communication. I'm ...
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3answers
158 views

Power meter current transformer: possible to sum mutiple phases

I am currently looking at this inexpensive power meter modules with TTL interface. It seems to use internally the same ASIC as many chinese wall-wart power meters: It comes with a current transformer ...
2
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2answers
109 views

Micro Watt Meter in Extreme Low Temperature [closed]

I'm using a solar panel in the Arctic and I want to measure the power it delivers to the associated sensors. Is there any recommendation on a watt meter for this environment? The temperature is ...
2
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1answer
2k views

How many disc revolutions make 1kWh on this kWh-meter?

This a kWh meter from a TV show. I'd like to know how many disc revolutions make 1 kWh. I think it's somehow coded in the whole data on the panel or could be derived from that information: I found a ...
1
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1answer
51 views

How To Calculate kVA values in power analyzer meters?

I am using a Schinder Electric PM2120 power analyser meter. I record values with it every 15 minutes. When I calculate values in kVA manually and compare them with the recorded values, I notice that ...
0
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1answer
46 views

How to read maximum input [closed]

This is Carlo Gavazzi Power Analyzer, the sticker says Input 3x380(660)V Does it means that the maximum input voltage per line must be 380V or 660V?
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0answers
89 views

Can we assume 230VAC in 3 phase system between phase and neutral?

If all devices connected to a 400V 3 phase power system are balanced and have a perfect power factor, can we assume the voltage between each phase and neutral is 230V? Why: I want to measure real ...
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2answers
1k views

Ammeter show half of the real current draw [closed]

I have a couple of ammeters from China, they have 2 connectors: Con 1: Yellow voltage sense, Black and Red to power the ammeter. Con 2: Thick Red and black for current sense. They are designed to ...
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0answers
47 views

Can a power board impact watt meter readings

I've just measured two different but conflicting readings using an off the shelf watt meter. My quandary is that these measurements conflict and seem untrustworthy. My question is: whether measuring ...
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3answers
592 views

Challenges of Power Line communication

I am looking into Power Line communication (PLC) as a means for smart metering. It looks totally possible to send the data from the meter to the source of the power supply or the transformer. Most of ...
3
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1answer
99 views

Questions regarding a micro-wattmeter

Whilst looking for test rigs to experiment with tuned circuit filters, I came across the following article (http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst/1991/12/page29/...
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3answers
1k views

What is the role of shunt in a Power Meter?

I just got a PZEM-051 Power meter and I can see that in order to measure the power, one needs a shunt. At least that's what I can see from different YouTube videos and I was wondering why would I need ...
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2answers
89 views

What do the specifications of this RF power meter mean?

I am looking for RF power meter to measure the output power of RF based PCB board which is estimated to give an output power of 45dBm at 868MHz. While searching for meter I have come across ...
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1answer
499 views

Atmel M90E26 energy meter

Datasheet Application Note I'm working with the atmel m90e26 IC. Its energy is numerically pulse_based, but I do not know what the relationship between energy and pulse is in this IC. There's a ...
6
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5answers
6k views

How does a bi-directional electricity meter know import from export?

I've searched everywhere for this but can't find the answer... Its possible to have 3 phase electricity meters that measure both imported and exported kwh with each value being recorded in separate ...
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3answers
2k views

Reactive energy: forward and reverse components?

I'm trying to figure out how to measure energy consumption with a power meter. It reports for the three phases: Total Active Energy Forward Active Energy Reverse Active Energy Total Reactive Energy ...
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2answers
120 views

Need help interpreting a Energy Meter datasheet

I am reading this datasheet for an energy meter, to start understanding how this market works. A friend of mine wants to make a test in a small office building to see if it pays having one of these ...
2
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2answers
151 views

How to partially drive a load with respective impact on my electricity meter?

I want to optimize the use of my photo-voltaic production by redirecting the remaining unused energy to electric heaters in winter, or something else in summer (given that fans are inductive loads and ...
0
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1answer
339 views

How to turn a PLC smart meter into 3G or Wifi [closed]

My utility has deployed bout 300,000 ZX E221 Three Phase Prepayment Smart Meters and they consist of a Meter control unit (MCU) which the consumer cannot access and a User Interface Unit (UIU), which ...
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0answers
328 views

Protection of Energy Meter from 35KV spark

I have been building a prototype of an energy meter for a project. One of the aims of the project is to make sure the energy meter can withstand a 35KV Spark applied to it. I was wondering how this ...
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3answers
551 views

My IC keeps blowing up - PAC1720 current sense IC

I am using a PAC1720 current measuring IC to measure the current/voltage/power being delivered to a lead acid motorcycle battery that is being charged. Here is a newer datasheet and an older ...
0
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1answer
714 views

Energy Meter energy calculation from power

I have interfaced a smart energy meter IC (ADE7878) to a microcontroller. The datasheet of the IC can be found here, http://www.analog.com/media/en/technical-documentation/data-sheets/...
1
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1answer
499 views

Methods for measuring cable path loss in RF Testing

I have been reading about various methods to perform a Cable Path Loss for RF Testing but not being a core RF person, I needed some insights on how it is done in Field or Lab. Here is my understanding ...
3
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5answers
705 views

Measuring relative rf signal strength [closed]

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 ...
1
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1answer
606 views

ADE7953 smart energy metering - how to connect it

I am currently looking for a IC that would allow me to aggregate energy metering data in my house. I came upon ADE7953 chip from Analog Devices but there is no info how to connect it with power source ...
1
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1answer
100 views

Poor pf value thru' energy meter on max. solar power exported to grid

We installed a couple of 100kW grid tied rooftop solar PV plants in factories which worked without flaw for quite sometime thereby contributing to electricity consumption and reducing the overall ...
19
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5answers
9k views

Circuit for measuring high voltage DC voltage (up to 1000V)

I am a final year E&E student and I am trying to built a power meter that must be able to measure quite high DC voltages, up to 1000 V DC. I am measuring with a simple 12-bit ADC that has an ...
5
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2answers
1k views

Can adding inductive load really reduce mains power consumption?

I have recently bought one of the cheap mains power meters (EL85-2042A to be precise) to monitor power consumption. It's really helpful when I need to know where my electricity bill comes from, or ...
1
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3answers
489 views

Is there an instrument to measure/uniquely identify gadget's RF signal strength

I'm not a technical person. Apologies for not being able to express myself clearly. I have a base station(blackbox audience response system bought from manufacturer) used during events that transmits ...
0
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1answer
220 views

Sampling circuit for decently high-accuracy ammeter?

I'm thinking about building a monitoring circuit for an existing residential power system. Currently there's a simple ammeter and digital voltmeter in use for some basic monitoring, but nothing fancy. ...
2
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2answers
470 views

Measuring Power Consumption of a Mixed-Voltage Device

TL;DR How can I measure the power consumption of a system that uses power supplies with multiple voltage outputs? Background I need to perform some power consumption tests on a desktop computer. I ...
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2answers
250 views

Need some insights regarding Shunts for ammeters

So i bought this cheap digital ammeter that can measure current from 0 - 100A: http://www.ebay.com/itm/141196910898 I will be using this with my LM317 (1.5A max). 0-100A version was the only one ...
0
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2answers
623 views

Calculate a voltage angle offset for a 3-Phase utility meter

I'm trying to analyze and write a program around some data that I was given. The data is a collection of readings from 3 Phase smart meters of an electrical utility. One value in the data that I can ...
0
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2answers
868 views

Power measurement on neutral instead of line

what is the advantage or disadvantage of measuring the power on neutral insted of line in a single phase wiring. Generally I have observed that metering chip is given input from line to its Vin or Iin....
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2answers
1k views

What Language should I use for automated testing? [closed]

I'm the Lab Manager for a small company in the RF industry and I've recently been asked by our engineer to find a more "up-to-date" programming option for automating my bench testing/calibration ...
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1answer
839 views

How to measure power/energy with analog circuit?

I would like to measure either power (running average, for example exponential average with a certain time constant) or energy (power integrated over time) with an analog circuit. The setup I have ...
1
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1answer
67 views

What type of energy consumption is indicated with the power rating of a device

For example, I have a 36W LED unit. If I needed to measure with a electricity meter, would 36W be active, reactive, or apparent power consumption? I would appreciate if you could tell me (if there ...
0
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1answer
418 views

milliwatt-hour meter [closed]

I am looking for a way to design something that can tell me the cumulative power draw of a circuit -- the same concept as a Kill-a-Watt, but measuring mWh rather than KWh. An added bonus would be the ...