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Suppose I have a single phase system and I have a sensor attached to to measure both voltage and current. The sensor samples for 50 kHz and the data is saved to a file. When we then graph out the file ...
Jake quin's user avatar
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20 votes
5 answers
4k views

My newly-restored (re-capped) 1950s vacuum tube voltmeter is now operational...but there's one further issue. The meter gives correct readings when lying on its back, but when oriented vertically- as ...
Simon Owen's user avatar
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3 votes
1 answer
570 views

I have a Uni-t UT210e clamp meter. I noticed that when measuring AC current, the reading varies if I move the wire inside the clamp. The measured value displayed on the meter is higher when the wire ...
beard999's user avatar
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1 answer
478 views

I need to fix my sentimental value Sanwa YX-360TRe analog meter. It was bought in 1995, slightly used. It can correctly give DC voltage reading. The problem is, it cannot zero-ohm adjust in all ranges,...
daparic's user avatar
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722 views

I currently have a 200 amp service with a single 200 amp meter. That meter feeds a 200 amp main panel on the other side of the wall that the meter is mounted to (think standard residential ...
ubiquibacon's user avatar
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1 answer
26 views

I am new to the electrical engineering stuff and am looking for some guidance. I'm going to be designing a off-grid power system for some devices. So I will need to get the power measurements from ...
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29 votes
2 answers
5k views

I was looking at an electrical installation and came across unfamiliar symbols on the front of a pair of meters. These are from three-phase 240v meters running on a timed system. One each for peak/off-...
Ben's user avatar
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2 votes
0 answers
777 views

I'm working with STM32F4, MAX4466 amplifier and a condenser microphone. In other words, Adafruit 1063. I want to get the sound level in dB unit. I know: Microphone sensitivity: 0.0063096 V/Pa ...
sabruri1's user avatar
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1 vote
3 answers
546 views

I have a simple VCA compressor based around the THAT 2180 VCA. http://www.thatcorp.com/datashts/dn115.pdf I would like to use a standard "VU meter" to indicate compression, but work in "...
jackwarner's user avatar
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1 vote
2 answers
190 views

In my house I have a mechanical water meter with a 2 wire reed switch that sends a pulse every 10 liters to (I suppose) an electronic meter to witch I don't have access. I'd like to connect a circuit ...
nicari's user avatar
  • 11
0 votes
0 answers
209 views

In the attached photo you can see the PCB of a simple EMF/RF meter. This meter shows, at the same time, the values of the electric field, magnetic field, and power density (see small illustration on ...
Gary's user avatar
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1 answer
3k views

I was reviewing an energy meter specification and I came across neutral current measurement. What is the importance of neutral current measurement in an energy meter for three phase power supply? I ...
miky-1's user avatar
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2 answers
215 views

I read on the internet that an iron vane is attracted to a coil and the vanr is attached to a pointer. Thus we get the reading. The article also said that we can measure both AC and DC using it. How ...
Tubrag's user avatar
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I just purchased this meter box and need to make sure it will work fine as a standard 240 volt residential meter. I noticed it says 5th Jaw in the title. What is ...
Michael Rader's user avatar
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1 answer
172 views

I have a Prime Instruments model 60-579 watt meter for a gas generator. It has a scale of 0 to 3750 watts and is marked 125 volts. So its for a 30 amp circuit. I have searched extensively for the ...
user6365692's user avatar
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1 vote
2 answers
489 views

I want to monitor my exported solar energy. The solar inverter (L1+N) is already connected to my mains power meter (grid) through a smart meter (SDM630), which in return, transmit RS485 data back to ...
Brian Petersen's user avatar
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2 answers
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Can someone from their experience share part number for equipment for low current measurement. The current to be measured is less than 6nA. I am aware that I can connect a resistor and by measuring ...
Sushant's user avatar
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1 answer
2k views

We installed solar plant in factory. After that power factor goes down to 0.16. Normally it never goes below 0.85 in history even if we keep APFC off. We always maintained it to 0.99. Note - Main ...
Avinash Gunjal's user avatar
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0 votes
2 answers
1k views

A kWh meter (electromechanical induction meter) is installed in front of each room in our apartment to measure the electricity usage of each room. Each room has its own breaker box to set up the 110-V ...
isend's user avatar
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0 answers
35 views

Is there a reliable way to read an in-circuit capacitor? I have a PCB-type ESR meter with a zero-force insertion socket that works for components, but do not have a meter that was designed to read ...
TommyS's user avatar
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1 vote
0 answers
196 views

I have an analogue tacho/RPM panel meter on an auto distributor tester, c1950s. This is not the original meter. It has two scales 0 - 6000 rpm and 0 - 1000 rpm, with a toggle switch between the two. ...
46Fordor's user avatar
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2 votes
5 answers
2k views

Can I connect this analog meter directly to 220VAC without any additional components? And what is the meaning of writing on the right?
Shaydzmi's user avatar
  • 299
10 votes
3 answers
3k views

This is front view of analog ammeter. There are 2 terminals with nut and bolt behind it but nothing marked neither plus nor minus.
user2681304's user avatar
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1 answer
1k views

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 ...
BetaEngineer's user avatar
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1 vote
2 answers
558 views

Does a multi-conductor DC clamp meter exist? Possibly using hall effect sensors in a specific orientation? I typically work with 24-28V DC solenoids valves & pressure transducers with 2 and 4-...
Karl Parks's user avatar
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0 votes
0 answers
208 views

I am building a small cigar box speaker with an lm386 and think it would be cool to have a working analog VU meter on the front. There are obviously a lot of cheap ones from China which I would be ...
user3348186's user avatar
  • 31
1 vote
4 answers
1k views

I was thinking of making KITT's voice box from Knight Rider, which is essentially a VU meter. I did some researching and found an appropriate IC, LM3916, http://www.mouser.com/ds/2/405/lm3915-443929....
TheCoolest2's user avatar
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0 votes
2 answers
2k views

In the UK, I had a smart meter installed a few weeks ago. My 4 year old Panasonic fridge/freezer (NR-B53VW2-WB) was working fine before the electric meter switch. After the install, after the engineer ...
Ben Davies's user avatar
  • 1
9 votes
1 answer
1k views

I understand a clamp meter works by measuring the magnetic field generated by current flowing through a wire. It's well known that clamping 2 wires carrying the same current in opposite directions ...
Zmaster's user avatar
  • 193
2 votes
2 answers
117 views

Consider an ideal digital milliammeter (zero resistance, zero uncertainty on AD converter input) with realistic (noisy, hysteresic, etc.) AD converter output and a \$3½\$ -digit display. Often when we ...
Degauss's user avatar
  • 31
0 votes
3 answers
1k views

I have an eBay power meter (V/A/W/Wh) that is specced between DC 6.5V and 100V. It's wired with a 75mV 100A shunt, like this: If I wanted to run the thing at 5 volts what would be the easiest way? ...
ozg's user avatar
  • 397
0 votes
1 answer
953 views

I've bought an old pocket style (think of an old pocket watch) analogue volt meter and the full scale reading is 6V. I would like to change this to 3V, however I have opened it up and there is no (...
Badger's user avatar
  • 3
0 votes
0 answers
59 views

In an electronic board I've found an LCD Counter and Hour Meter. Here's the technical information. https://docs-emea.rs-online.com/webdocs/001a/0900766b8001abd9.pdf Since it's very expensive, I ...
MatD's user avatar
  • 47
0 votes
0 answers
152 views

I'm trying to acquire the tic signal of a french power meter. From the datasheet available here of the TIC signal we can find out that the signal is (page 7/38): 6 Vrms +/- 10% at 50 kHz It comes ...
A.Girafe's user avatar
  • 45
1 vote
1 answer
166 views

Note: I'm here to see if there's an objective reason to choose one type over the other. I've got some projects in mind that would use a microcontroller to drive one or more analog meters as displays, ...
MartyMacGyver's user avatar
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-2 votes
2 answers
1k views

I built a simple Vu Meter on a breadboard using the LM3915 IC following a tutorial found on the web, all seems to works fine and the final result is something like this: The only difference is that, ...
icebit's user avatar
  • 101
2 votes
2 answers
296 views

I have an EE background, but am new to metering hardware. Looking at metering equipment for high voltage measurements (up to 6.6 kV), it seems most only go up to 480 V, even when classified as ...
Errorum's user avatar
  • 125
-1 votes
1 answer
2k views

I want to add the lux meter to my application. My controller works with 3.3V and ADC max reading voltage is 1.2Vref. I tried with LDR but I'm not able to get accurate values and the values also not ...
ravi teja's user avatar
  • 21
4 votes
3 answers
1k views

I'm wondering why I can't find an LCR meter with frequency band that starts for example from 1 Hz. Is there some specific reason? EDIT: My question comes from the need to measure the impedance of a ...
thoraz's user avatar
  • 409
3 votes
1 answer
193 views

I'm dealing with the measurement of impedance sweeping the frequency from 0,1Hz to 100KHz. On the web I found many methods but the most quoted seems to be the one which uses an operation amplifier in ...
thoraz's user avatar
  • 409
0 votes
1 answer
890 views

On the energy meter nameplate is a current rating 20-80A, which I can assume has something to do with max current. I'm particularly interested in the "20" part, though. What does this rating mean? I ...
Ph3ng's user avatar
  • 357
-2 votes
1 answer
868 views

I have the following ammeter: https://www.aliexpress.com/item/Red-led-Display-Color-0-56-Digital-Ammeter-DC-0-100A-4-wires-3-digit-car/1301822575.html The seller recommends 75mV 100A shunt be placed ...
Bharath Ram's user avatar
  • 51
0 votes
2 answers
3k views

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 ...
Tiago Conceição's user avatar
  • 302
0 votes
2 answers
63 views

I am currently working on my first li-poly power supply, and I am testing Texas instruments BQ21040 PMIC. The device has three charging phases that I need to monitor to do some troubleshooting. I ...
Iam Pyre's user avatar
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1 vote
0 answers
9k views

I have got a bill of approx 14000 Units (50000 INR) for a month on 2kW connection. As per my analysis and understanding, it can't be more than 2 * 24 HRs * 30 Days = 1440. I think electricity meter ...
Lovin's user avatar
  • 11
-2 votes
1 answer
142 views

I'm trying to identify a component which I'm not entirely sure what it is. Here's an image: The component I'm asking about is circled in red. The product is a reader + transmitter for water meters ...
Andrés's user avatar
  • 483
0 votes
1 answer
110 views

I have a multi function meter and i want to collect the data and display it. My idea was to create a api for serial communication?? will the idea work or is there any other better way?? the meter uses ...
Ganesha V S's user avatar
  • 5
0 votes
1 answer
314 views

I got this old wattmeter with only 2 terminals in the back. It says 60 mV, which I haven't seen in similar ones. How is it supposed to be connected to measure kW?
user162889's user avatar
  • 318
36 votes
3 answers
3k views

I have seen lots of ampere meter shunts like this. What is the reason for this small cut?
user_fs10's user avatar
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0 votes
1 answer
507 views

Following an illustration of D'Arsonval movement such as the following... I notice that the N polarized part of the coil is connected to the positive lead and the S polarized part of the coil is ...
Snoop's user avatar
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