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I ask this question because my background domestic electricity usage is shown as 200Wh on the display but my measurements show a lower power usage with a power factor of 0.6, so I put a scope on it, ...
Rod Green's user avatar
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I accidentally measured the inductance of a coil while it was connected to 24V power supply. The probe holes on the meter (+/-) smoked a little bit and smelt like something burnt, before I realized ...
Kinjal's user avatar
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I have the following circuit diagram. It shows a 5V power supply for the PZEM-004T energy meter. The diagram also shows/have 2 logical level converters for PZEM-004T. Unfortunately, after soldering ...
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Does the M90E32AS support shunt metering measurement for current? Referring to the schematic image below: If I connect a current transformer to the J-IC connector, does the current entering through ...
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What is the value of the Cf, filter cap for the ACS712? https://www.researchgate.net/figure/Allegro-ACS712-Hall-effect-current-sensor_fig1_334195395 This here says C1 is 100nF and Cf is 1nF. This ...
reaverx's user avatar
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I have been reading about tampering energy meters and how to prevent it (one reference). From my research, both analog and digital meters can be tampered if the neutral line disconnected. Consider the ...
Murilo's user avatar
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In my home I have an 3-phase electronic energy meter. I have both solar panels and consumers in the house. I am wondering what is registered when for example I have this situation: On L1-L2 I use 2 kW ...
Johannes Linkels's user avatar
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I am working on distribution transformer monitoring device in which we measure 3 phase AC voltage system. We are using SP17 5 pin circular connector and link attached. We found the connector is ...
Alihussain Vohra's user avatar
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I want to ask a question about electricity meters. The amount of current in the cables coming from the network to the house and distributed to the sockets is determined by the resistance and is fixed. ...
Ahmet's user avatar
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I have a vintage thermocouple type ammeter that doesn't seem to be working correctly and the fault seems to lie in the thermocouple. You can see the two larger chunks of conductive material (under the ...
techrah's user avatar
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I have two N6792A modular installed in N6702C mainframe. It keeps showing "Unr" unregulated when meter is on.
Henry's user avatar
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2 answers
307 views

So I'm working on an audio project, and I need a built-in frequency meter (for tuning the instrument, basically, so the range is like 50 Hz - 5000 Hz with an required accuracy around 1 Hz). I see a ...
cduston's user avatar
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I m developing a board based on stpm33 Power meter based on a demoboard evalstpm33. Stpm33 requires both current an voltage to evaluate Power. For voltage It use 220 vac scaled to a 0.3V max using ...
emanuele aterini's user avatar
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I'm comparing the Fluke I410, to the Fluke 324, The Fluke I410 enables AC/DC amp measuring with an accessory clamp on the Fluke 87V. It handles 400 amp, ac and dc voltage to 600v. It's $250. The ...
Evan Carroll's user avatar
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I am trying to monitor the energy use in a shack with a sub panel that is rented behind our house. The cheapest and easiest way seems to be an AC 100 A digital meter with split core CT. My question ...
Prometheus Prime's user avatar
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In IEC 62052-11, Heating test, describe as below, 7.2 Heating Under rated operating conditions, electrical circuits and insulation shall not reach a temperature which might adversely affect the ...
user395338's user avatar
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Most residential electrical smart meters in the US have 4 terminals: in/out for each phase. They do not have a neutral or ground connection, although there are also 5-jaw meter sockets with a neutral ...
willem.hill's user avatar
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I want to install an energy meter to monitor the energy consumption of a transformer. The secondary side of this transformer is a parallel circuit, making it impossible to connect three current ...
maima123's user avatar
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In this circuit, when in bar mode all LEDs light up, in dot mode only LD10s. Overall it doesn't react to the audio input at all. I wanted to use a half wave rectifier before the LM3914 for better ...
Status Re's user avatar
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So, I have an image of an ESR Meter from YouTube. It is the relatively popular [Brand Unknown] MESR-100 entry-level standalone ESR meter. Please see image below. So, below the LCD on the faceplate, it ...
Prashanth C's user avatar
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This is Digital Volt Amp meter display module. Working voltage was max 30v and I burned the transistor BL P11 NPN (1A) with more input. Replaced with CXT5551 (600mA), operating current for module is ...
Paul's user avatar
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I am trying to build an circuit with an PCB to sample the main AC waveform in an ADC set to 0V to 3.3V range. I noticed that there are some ZMPT101B modules that is based on LM358. I made some ...
fborges22's user avatar
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5 answers
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May be a little newbie question, but I since I am an electronics beginner and couldn’t find a direct answer I will ask it. I blew the 600 mA fuse on my brand new multimeter, I think I didn’t change ...
Hoekplaat's user avatar
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If I have a fusebox with about ten/fifteen eastron sdm630 and Orno OR-WE-515 kWh meters with RS485 modbus, can I daisy chain ...
Tim's user avatar
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We are using a 24 V, 100 A external alternator in our vehicle to charge leisure batteries. We need to monitor the alternator’s voltages and current on a digital meter but the alternator is grounded ...
dss's user avatar
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0 answers
143 views

I'm trying to evaluate the frequency of 18 independent sources of square waves in my system (the signals are generated independently as feedback.) Basically, I need to have a way to use one ...
TFO's user avatar
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3 answers
857 views

Please see the attached pictures. I am new to electrical stuff and experimenting. The meter in the attached pic shows over 63 amps with ZERO load attached. Is this meter damaged?
Matthew Neesley's user avatar
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I am not an electrical engineer. I am software engineer trying to build an app to work with a smart plug and I just don't understand the basic concepts and so just looking for some beginner help. I ...
Moshe W's user avatar
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186 views

I am currently using the Allegro ACS37800 IC to monitor power, from what I found on the datasheets and from the internet this IC is capable of calculating the voltage, current, and power. I actually ...
alasa995's user avatar
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0 answers
36 views

I have an analog Four Terminal Earth Resistance Meter with 100 ohms as the maximum range and 1 ohm is the resolution. The scale is linear. I need to measure low resistances below 1 ohm. How can I ...
ark1974's user avatar
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I was working on a design question (this is not homework, just personal practice). Can someone please help me get started or guide me through any worked steps please?
kam 's user avatar
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1 vote
1 answer
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I have been doing research about the name of these electric meters. I found a rough definition of it, but i have been told the name is not right. the definition goes as follow: "Macrometers are ...
fernando vasquez's user avatar
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1 vote
2 answers
388 views

I am a beginner in electronics. I have a meter which is (0.13V)(130ohms)(1mA) rated. I am not inserting the meter for now(don't want to destroy it) instead, I am trying to use a dummy loader. Here is ...
Pococurante Bird's user avatar
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2 answers
146 views

I am not an English native also I am new with these things. I figured out how to make meter but I just do not understand what they want us to do with these restricted part. It would be really nice if ...
Pococurante Bird's user avatar
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Here's my qualm: As per the diagram, I can't understand how the trim probe (resistor) affects the meter reading for this thermocouple circuit. If I understand the diagram correctly, everything is ...
Bumblingidiot's user avatar
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Firstly, I am in the UK if that has any relevance on your responses I have Smart Meters installed by my energy supplier for both Gas and Electric. They also provide a very basic In House Display (IHD) ...
Chris Hammond's user avatar
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1 answer
384 views

Here in Turkey typical residence supply is single phase at 230V. Years ago a friend's father built a residence and arranged for a three phase supply as he felt that this would provide a more stable ...
Keith's user avatar
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1 vote
1 answer
183 views

I have read that most pinless moisture meters are based on the principle of capacitance. I know that when the material loses water, the dielectric constant of the material decreases and the ...
Sara SG's user avatar
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1 answer
234 views

Please take a look at the picture below. What I am trying to do is designing a "switch" that can close the circuit so that the resistance meter can measure the resistance of the resistor. I ...
John's user avatar
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2 answers
532 views

Figure 1. 7.023 MHz RF field strength meter Figure 2. Signal strength meter What kind of modifications do I need to make to this RF field strength meter circuit, to attach the signal strength meter?
Kaspars Andins's user avatar
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1 answer
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I have a number of cheap electricity consumption meters of which I used one on a modified square wave inverter I bought. They cost less than 15 EUR per piece so most likely they don't have much ...
juhist's user avatar
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1 vote
2 answers
360 views

I'm trying to identify this port and read data off it. It's 1cm across, including a small square on the lower left. 3 pins, leftmost near square seems to be GND and rightmost reads 3.3V+ w. respect ...
Darling_1kkg's user avatar
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8 votes
1 answer
920 views

After the Soviet Buran (БУРАН) program was suspended in the late 1980s, the Buran space shuttle was housed in a hangar at Baikonur. That hanger unfortunately collapsed due to structural failure in ...
Polynomial's user avatar
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2 answers
267 views

We can use non-isolated USB to TTL cable in between battery operated devices, ut when we are dealing with AC devices like communication between desktop CPU and electric meter (embedded MCU), we need ...
kshitij singh's user avatar
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0 votes
1 answer
872 views

How accurate must the real time clock of an electricity meter be? Apologies if this is more a legal question than an electrical one. I am particularly interested in Western Europe but also interested ...
user133831's user avatar
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1 vote
0 answers
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BACKGROUND: Domestic 3 phase 220VAC supply in Thailand. Power company meter is 4 wire GE 3 phase 15A/45A. Massive power bills when mains breakers were turned off (back in home country for 9 months ...
David Supastore's user avatar
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-1 votes
1 answer
86 views

I am not an expert on interfaces and communication protocols and I am trying to get data from several meters to read it remotely. The meters have an M-Bus interface to a Data-Logger. The Data-Logger ...
Karen Semmler's user avatar
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0 votes
0 answers
82 views

I have a frequency meter that requires a minimum signal voltage of 10VDC to read the frequency. My output level is only about 2.5-3VDC. What is the easiest way I can amplify my signal voltage to ...
Russell Smith's user avatar
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0 votes
1 answer
122 views

This circuit is a part of a field strength meter circuit in an old magazine, the value of inductor J1 is unknown (due to a print error in the magazine.) The circuit works like this: With S1 open and ...
gino's user avatar
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0 votes
1 answer
352 views

I have recently installed solar system that adds energy to the grid. My utility company has installed bi-directional meter at my place to record energy consumed as well as energy added to the grid. ...
Fawad Pasha's user avatar
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