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Questions tagged [meter]

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31 views

LCD Counter and Hour Meter

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 ...
0
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0answers
56 views

Acquire a “TIC” signal from a power meter

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 ...
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1answer
75 views

Considering analog meters as displays, which would be more versatile - voltmeters or ammeters?

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, ...
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0answers
79 views

Reverse Continuity Testing

I am interested in testing some low voltage cables for their quality. For example, USB, audio and Ethernet cables. Testing continuity is simple, but I want to know if these cables may momentarily ...
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2answers
92 views

VuMeter using LM3915 not working properly

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, ...
2
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2answers
118 views

Can any meter be PT connected?

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 ...
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1answer
180 views

Which one is better to build lux meter, either LDR or photodiode?

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 ...
4
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3answers
558 views

Why doesn't commercial LCR meters' band start from very low frequencies?

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 ...
2
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1answer
57 views

Home-made impedance meter: what's the difference between voltage divider and active filter methods

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 ...
0
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1answer
67 views

What does the 20-80A rating on an energy meter mean?

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 ...
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0answers
49 views

HPL EB meter data read reg

I am trying to receive data from HPL EB meter which is working under DLMS protocol.I can able to read data from EB meter serially.I want to which is R,Y,B and current values ,temperatures from that ...
0
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1answer
149 views

What is the correct shunt size for the following ammeter and configuration?

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 ...
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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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2answers
33 views

Ammeter ideal for testing, leaving on work bench for long periods [closed]

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 ...
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0answers
103 views

How much maximum electricity bill (units) can be generated on 2 KW connection?

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 ...
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1answer
101 views

Help me identify a component

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 ...
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0answers
164 views

DC energy meter 1000V with RS485 and Arduino getting voltage and current from register issue

I am doing 1000V DC meter with Arduino and RS485. The problem is that when I am sending register value from Arduino I am not getting the output as I want, the output is in hexadecimal, and I can't ...
0
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1answer
62 views

way to display the data from a multi function meter [closed]

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 ...
0
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1answer
87 views

Old analog wattmeter 2 terminals

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?
31
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2answers
2k views

Why this small cut in Ampere meter shunt?

I have seen lot of ampere meter shunt like this. What is the reason for this small cut?
0
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1answer
156 views

How does the lead polarity work on a D'Arsonval galvanometer?

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 ...
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2answers
99 views

Questions about clamp meters

Are clamp meters as accurate as multimeters? Could I replace a multimeter with a clamp meter? What can clamp meters do that multimeters can't? What can multimeters do that clamp meters cant?
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0answers
219 views

Poor man's capacitance meter with range control

I'm interested in making a capacitance meter with on-hand parts. Rather than connecting a bare microcontroller I'm inclined on using my Arduino Mega, since it has a built-in power supply and USB ...
1
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1answer
299 views

How to “fake” a megawattmeter

I have a vintage megawattmeter. It is able to indicate values from -1 to 7 MW. I wish to be able to provoke it to display any value I want, preferably without actually generating megawatts of power. ...
0
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2answers
260 views

Changing the offset and span on an analog voltmeter

I have an analog meter. It belongs on an electric e-bike.. The default reading is about 88v-84v DC high side and 63v DC low side. It has a resistor and diode on one side then two diodes in series on ...
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2answers
291 views

Is there any analog meter with the needle capable of a full revolution?

Is there any analog meter with the needle capable of a full revolution? I have always seen only instruments where the needle can rotate only a fraction of 360 degrees, for example in the following ...
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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 ...
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2answers
75 views

Digital insulation meter measurement limits

A Meggar digital insulation meter user manual warns: "When using 500 V measurement to measure resistance less than 1.5 MΩ or 1000 V to measure resistance less than 5 MΩ, measurement time must not ...
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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 ...
0
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1answer
134 views

PCIM176J panel meter

I scored a couple of panel meters stamped PCIM 176J. Anyone have a datasheet for this thing? Google found nothing.
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5answers
243 views

inconsistent electricity meter readings

I have the electricity meter pictured. When I attach various devices I get readings (amps, volts, watts) that are proportional. Expected values are a few percentage points off from the readings. ...
4
votes
3answers
9k views

Building a pH meter circuit - is it feasible?

Let's say I have a budget of $15-20 to build a pH meter. I will then read the analog values from a microcontroller or such, but I want to first focus on somehow getting a reliable pH value on a ...
1
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0answers
76 views

PAC1720 Standby Mode

I am having a hard time putting my PAC1720 into standby mode reliably. Here is the datasheet If I put the device in standby mode, then take it out of standby mode, and then try to put it in standby ...
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2answers
133 views

Voltmeter vu-meter dynamo

To start, I have no experience with electronics except what I've been googling the past week. What I'm having issues with is finding a way to make a voltmeter that functions like an led vu-meter would....
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3answers
272 views

Using IR thermometer for measuring component temperature

I'm trying to measure the temperature of various steel components being heated using power frequency induction heater. The IR meter being used can be set for emmissivity value of 0.1 to 1.0. For the ...
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1answer
2k views

ACS 712 Current Sensor Calibration problem

I have a similar circuit to: http://henrysbench.capnfatz.com/henrys-bench/arduino-current-measurements/the-acs712-current-sensor-with-an-arduino/ During my initial test it was calibrated just fine. ...
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2answers
164 views

Induction meter, finding standard reading

If I have the time it takes an induction meters disc to complete one revolution, then how can I work out the power in watts ?, I feel like i'm missing some other parameter that is needed I basically ...
0
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1answer
1k views

Energy Measurement in 3 phase ac split into 3 lines

I have observed that residential buildings receive 3 phase supply, even though almost all appliances are single phase input type. The phases are split into three separate lines and loads are evenly ...
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0answers
426 views

ACS712 - 30A power meter adjustment

Hello I working on an arduino energy meter same as: http://www.instructables.com/id/ARDUINO-ENERGY-METER/?ALLSTEPS except I using the ACS712 - 30A sensor with sensitivity "66" by the datasheet. <...
0
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1answer
350 views

Bi-directional energy meter

I have a question regarding reading import and export energy from an electricity meter, the system has a solar array fixed allowing power to be exported to the energy grid when there is excess power. ...
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1answer
80 views

AGC which tells you what gain its at?

I am looking for an AGC (Automatic Gain Control) which outputs not only the normal output but also another output which tells you what gain it is using. I need this for an automatic voltage meter I am ...
1
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0answers
725 views

CT (current Transformer protection)

I try to read some value from CT. Everything is alright but sometimes I read some really high value on my arduino pin. I was looking some information about the CT protection. People talked about diode ...
0
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2answers
824 views

RF power meter circuit

I want to setup a radio transmitter and reciever a few centimeters apart and measure the signal strength i get. There will be a filter in between which absorbs particles and the idea is that i want ...
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2answers
981 views

Changing analogue ammeter scale from 1A to 1mA

How can I change analogue panel ammeter for metering 1A DC scale to 1mA DC ? As far as I know, you can use shunt resistor for doing this other way around, but this doesn't help much. Thank you EDIT:...
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1answer
205 views

arduino current

I want to start learning EE with Arduino so as a project I decided to build an Ohmmeter and measure a (specific) resistance that should be about 100 KΩ ±50KΩ. In order to probe for that resistance I ...
0
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1answer
117 views

CS5453 Energy Meter IC

Recently I have come across Energy Meter IC "CS5463". I read the datasheet and it says that the internal registers of the IC stores the Power information as a percentage. My understanding is that I ...
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2answers
2k views

Trying to read serial communication from smart meter with Arduino

First my compliments for this wonderful site. I'm hoping to find an answer to my problem. I've checked to find answers, however was not able to find it. My background is somewhat technical, only with ...
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2answers
305 views

Facing some questions regarding my energy meter project

I am working on my minor project in college and am facing a dilemma/problem with it. Project Description: I am working with an energy meter and am trying to make it smart (in the same way as many ...
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2answers
478 views

Connecting AC analog amps meter

I'm a hobbyist/newby and I buy some items to build a cheap nichrome wire heater.First I buy a 50feet of 22gauges nichrome wire. For 120V AC source , I need 8feet of this nichrome wire to get desired ...
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2answers
5k views

Can I use 2n2222 transistor instead of c9013 transistor in a vu meter?

I am building a science project for my friend. We chose to make a VU Meter. I am planning to make the Vu Meter as the schematic in the image: The audio source will be 3.5mm jack output of a ...