Questions tagged [meter]
The meter tag has no usage guidance.
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Can LM358 be replaced with AD8676
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 ...
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Did a blown fuse in my multimeter damage my multimeter?
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 ...
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Can I connect ten RS485 modbus kWh meters to one RJ45 modbus server? [closed]
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 ...
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How to connect a digital meter between alternator and batteries?
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 ...
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How can I measure the frequency of multiple square waves?
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 ...
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Voltmeter reading over 63 amps with no load attached
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?
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Understanding Energy Meter Output
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 ...
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Getting Energy values from the Allegro ACS37800
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 ...
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Change the range of Earth Resistance Meter to measure lower resistance values
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 ...
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Interfacing temperature system to moving coil
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?
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How are "Macrometers" officially called?
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 ...
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Trying to make an ammeter to measure 5mA of current and having some difficulties and confusions
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 ...
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I have to do a project building DC voltmeter, ammeter and AC voltmeter. It has restricted spec which is really hard to understand for me as a beginner
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 ...
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Please fix my broken understanding of this simple thermocouple circuit
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 ...
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Energy Smart Meter | Data Feed | In House Display
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) ...
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Can a single phase supply from a 3 phase outlet result in excessive power meter readings?
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 ...
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Pinless moisture meters
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 ...
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Replacing the mechanical switch with digital that has low on-resistance
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 ...
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How to modify RF field strength meter circuit to attach signal strength meter? [closed]
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?
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Why could a cheap electricity consumption meter break on modified square wave inverter?
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 ...
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Identification - 3-pin 3.3V serial port?
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 ...
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Restoring and operating a temperature gauge from the Soviet space shuttle Buran
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 ...
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Why do we need an isolated USB to TTL converter cable for communication between the desktop CPU and the target? [closed]
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 ...
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How do older-style meters still in use keep their clocks synced?
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 ...
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How to test if a domestic 3 phase power company meter is reading wrong?
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 ...
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Access meter readings remotely
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 ...
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Increase voltage level to frequency meter
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 ...
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Help understand the role of an inductor and its value (educated guess)
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 ...
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How to calculate energy added to grid using active and reactive power?
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.
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How does power factor show itself in this data from sensor readings?
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 ...
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Why is this meter giving different readings depending on its orientation?
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 ...
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Clamp meter readings
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 ...
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Need diagnostic tips for ancient Sanwa YX-360TRe
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,...
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How to correctly bond two 200 amp main panels on a 400 amp service
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 ...
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When using a Primera-Line Wattage and Current Meter, is it showing AC or DC measurements?
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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What do the line-and-circle symbols mean on these electric meters?
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-...
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Sound level meter using a microphone with ADC
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
...
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Drive a VU meter negative from "0dB" to show compression with VCA compressor
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 "...
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Add second sensing circuit to already wired reed switch
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 ...
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Where are the sensors of the EMF/RF meter on the circuit board?
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 ...
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Energy meter neutral current measurement
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 ...
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How do moving iron meters work on AC current? [duplicate]
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 ...
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What is 5th Jaw?
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 ...
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What current transformer do I need?
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 ...
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Smart meters setup
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 ...
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Low amplitude curent measurement [closed]
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 ...
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Power factor down after solar connection
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 ...
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2-wire vs. 3-wire watt-hour meter?
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 ...
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Is there a reliable way to read an in-circuit capacitor? [duplicate]
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 ...
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Will a lower resistance potentiometer improve a panel meter scale reading?
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. ...
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