Questions tagged [meter]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
20 views

Smart meters data correction average time

In the context of smart grids, what is the average time delay of measurements correction provided by smart meter data/AMI data, given that some of the meters may provide incomplete readings because of ...
0
votes
0answers
32 views

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 ...
1
vote
0answers
60 views

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. ...
0
votes
5answers
110 views

Can I connect this meter to 220vac?

Can I connect this analog meter directly to 220VAC without any additional components? And what is the meaning of writing on the right?
10
votes
3answers
985 views

In below picture, is ammeter AC or DC? Is there direction for connection with load in series? If so what if I connect in wrong direction?

This is front view of analog ammeter. There are 2 terminals with nut and bolt behind it but nothing marked neither plus nor minus.
0
votes
1answer
39 views

How Power measured by Meters is affected by Harmonics?

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 ...
0
votes
1answer
40 views

Multi-Conductor DC Clamp Meter

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-...
0
votes
0answers
47 views

Analog VU meter with 1 watt lm386 amp

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 ...
0
votes
4answers
395 views

What are these transistors doing and how are they working in this VU Meter?

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....
0
votes
2answers
306 views

Mains AC Reverse Polarity - Has this damaged my fridge/freezer PCB? [closed]

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 ...
7
votes
1answer
174 views

Why is a clamp meter unaffected by nearby wires?

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 ...
1
vote
2answers
74 views

Higher precision with less digits?

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 ...
0
votes
3answers
347 views

How can I run a 6.5V-100V power meter on 5V?

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? ...
0
votes
1answer
102 views

Changing the full scale deflection of an analogue volt meter

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 (...
0
votes
0answers
37 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
votes
0answers
72 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 ...
1
vote
1answer
86 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, ...
-2
votes
2answers
321 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
votes
2answers
131 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 ...
-1
votes
1answer
574 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
votes
3answers
642 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 ...
3
votes
1answer
75 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
votes
1answer
151 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 ...
0
votes
1answer
394 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 ...
0
votes
2answers
1k 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
votes
2answers
37 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 ...
1
vote
0answers
548 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 ...
-2
votes
1answer
119 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 ...
0
votes
1answer
66 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
votes
1answer
137 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?
33
votes
2answers
3k 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
votes
1answer
210 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 ...
1
vote
2answers
173 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?
0
votes
0answers
337 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
vote
1answer
308 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
votes
2answers
442 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 ...
1
vote
2answers
419 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 ...
0
votes
3answers
2k 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
votes
2answers
78 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 ...
0
votes
2answers
132 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
votes
1answer
250 views

PCIM176J panel meter

I scored a couple of panel meters stamped PCIM 176J. Anyone have a datasheet for this thing? Google found nothing.
1
vote
5answers
347 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
12k 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
vote
2answers
154 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....
1
vote
3answers
371 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 ...
-3
votes
1answer
2k views

ACS 712 Current Sensor Calibration problem [closed]

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. ...
1
vote
2answers
214 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
votes
1answer
2k 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 ...
0
votes
1answer
419 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. ...
1
vote
1answer
88 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 ...