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Questions tagged [power-meter]

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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 ...
0
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1answer
74 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
30 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
57 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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0answers
11 views

What range of power factors is used to test electricity meters under ANSI C12.20?

ANSI C12.20 is the standard used in the U.S. for electricity meters. In the contents and scope (pdf) I see that test number four involves varying the power factor of the test load and observing the ...
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3answers
94 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
97 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
473 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 ...
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1answer
44 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
42 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
434 views

Calculating total apparent power: unbalanced 3 phase system and 2 wattmeters

I understand how to calculate the total real (or active) power in a 3 phase wye system (balanced or not) using two wattmeters: Wattmeter 1: line-to-line voltage \$v_{a/c}(t)\$ and phase current \$i_a(...
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0answers
77 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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0answers
56 views

ADC usage for power meter

I am designing power meter with STM32F030K6 and I measured that the device I am designing it for has rising front of about 3 ns and my microcontroller has ADC only of 1 MHz sampling frequency. As far ...
0
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2answers
454 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 ...
0
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0answers
44 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 ...
0
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3answers
357 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
96 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
853 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 ...
0
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2answers
72 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 ...
0
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1answer
395 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 ...
5
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5answers
4k 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 ...
0
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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 ...
0
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2answers
100 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 ...
3
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2answers
140 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
307 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
260 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 ...
4
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3answers
465 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
639 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
374 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
539 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
500 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
83 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 ...
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0answers
264 views

3 phase star connected metering trafo with corner grounding - why?

Can't find detailed information about why a metering system would use a, "corner grounded" star transformer. What are the advantages of doing it this way? All I've found is a vague reference to, "...
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5answers
7k 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
908 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
404 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
177 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
446 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 ...
0
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2answers
207 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
562 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
648 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 ...
0
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1answer
763 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
375 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 ...
2
votes
1answer
6k views

How to amplify the signal of a TCRT5000 phototransistor

I'm trying to read the IR signal from my Itron C1S Power meter. It has an emitter that lights up for 10 ms every Wh of consumption. This question is based on my prior question: Use a photoresistor ...
14
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2answers
4k views

How does this iPhone app measure the power flowing through an AC appliance cord?

My electric utility released an iPhone app called "DTE Insight" which (among other things) measures the amount of power flowing through an appliance's power cord by asking you to hold the cord against ...
1
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1answer
1k views

Does a current clamp measure apparent or active current? And is it accurate?

1) Apparent or active Does an current clamp measure apparent or active current? I am looking at energy consumption metering solutions for a building. So far, the affordable products seem to click ...
3
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2answers
7k views

What is “transformer connected” vs. “direct connected” for a electricity meter?

I am looking at sub electricity meters. Right now I am reading about the ABB product line EQ. In the documentation (link to PDF, "Electricity Meters - For modular enclosures and DIN rail"), they split ...
2
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3answers
2k views

Home Current Meter - is this a good solution?

I want to build a simple current meter to measure my power usage at home, and have the data sent to my blog's database. (I know there are similar solutions out there, but this project seems engaging ...