Questions tagged [voltage-measurement]

Act of measuring voltage

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2answers
99 views

Why doesn’t voltage drop to 0 when a capacitor becomes fully charged?

This is my understanding so far of what capacitors are and how they work, if it helps to answer my question at a level I can understand: A capacitor is composed of two equally sized conductive plates ...
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4answers
89 views

Does resistance decrease over a resistor?

If ohms law pertains to voltage, current, resistance across a resistor, in order for voltage to drop, and current to remain the same, does resistance drop as well across the resistor? To explain what ...
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0answers
35 views

High quasi-isolated voltage measurement

I have to measure a DC voltage and an AC voltage around 100V. I found the circuit with an AD629 and one OP177. I simulated everything in Spice and it works fine, at least in the simulation. In ...
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0answers
25 views

Measuring battery life for Arduino device [duplicate]

I'm building a IoT thing based on Arduino. The thing will be powered by a 12V battery. The reason why I want to use a 12V battery is because I will also have motors on the thing. I would like my ...
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0answers
15 views

ZMPT107 + Transimpedance Amplifier + Opamp voltage divider: is this circuit work?

First Sorry my basic knowledge about electric and also English. And sorry title of question is not clear enough. Please correct me if I wrong, Thanks so much I'm trying design my own household energy ...
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1answer
34 views

Analog input like in a PLC: Thermistor or 0-10V

Depending on the configuration, PLCs can often measure 0-10V, resistance or 0-20mA on the same set of screws. How to use the same screw terminal to measure resistance of an NTC element, voltages in ...
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1answer
38 views

Multiplex Sigma Delta ADC outputs (AD7401A)

i'm measuring 30 different voltages without common ground. Each voltage is measured by an AD7401A Sigma-Delta modulator/ADC. The signals go into an FPGA (Xilinx Spartan 6). But the I/O-Pins are ...
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1answer
84 views

Transformer less Power supply's waveform is Noisy

Hi I want to measure the mains voltage using transformerless power supply. the output of the supply is fed to an optocoupler and later read by a microcontroller. The problem i am having is that the ...
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0answers
82 views

High-frequency (up to 1 MHz) voltage (RMS) sensor [on hold]

I want to measure RMS voltage at around 1 MHz using an MCU. The frequency will be fixed and known. Voltage waveform is very close to sinusoidal and the expected measurement accuracy is better than 5%. ...
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3answers
94 views

Measure 10kV with 600V rated multimeter [duplicate]

My multimeter is rated for 600V but I need to measure a 10kV AC source. I was thinking of building a voltage divider but I wouldn't know how many resistors it would take to safely measure this high of ...
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2answers
95 views

Measure volt, amps, watt and kWh of an external 12 V DC system

I saw online some cheap hardware ~10$ that can measure volt, amps, watt and kWh and display the results on an LCD screen. I could buy and plug these on my 12 V solar panel system to monitor it. (5 of ...
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5answers
93 views

Voltage signal and Current Signal

Please give an intuitive explanation of difference between how a signal or data is carried using voltage and current? I'm wondering even though current and voltage inevitability co-exist, why do we ...
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5answers
6k views

Why is the voltage measurement of this circuit different when the switch is on?

I built a simple circuit with two lamps and a slide switch powered by two 1.5 V batteries. When the slide switch is off, the voltage of the circuit measured by a multimeter is 3.15 V: However, ...
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2answers
43 views

Measurement, Multi-pin voltage visualizer?

Are there better&standard way to debug/inspect multiple pin voltages instead of a multmeter? It is rather inefficient.
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2answers
91 views

Can I use a simple voltage divider with an instrumentation amplifier to measure from 0 to 10V?

There is a design of a circuit proposed in the following way: simulate this circuit – Schematic created using CircuitLab The amplifier has a gain of 80, on R1 when the input voltage is equal ...
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2answers
40 views

Sensing Voltage and Current of an Adjustable Voltage Source

I am currently working on an Adjustable Voltage Source, the Voltage Source is built by a voltage regulator with an OpAmp with and a Darlington transistor for current amplifying as the following ...
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1answer
193 views

∀ (for all) in voltmeter specification

I am working on a voltmeter and the tolerance for it is 0.25% ∀ 1 digit. I am not sure what exactly what this means. I am guessing if my value was 19.95 'for all' could mean I have a range of ...
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0answers
28 views

How can I measure voltage up to 120V in an Arduino? [duplicate]

I'm a beginner in electronics world, I've developed things before but not so sofisticated. Now I have to create a prototype and I need to measure voltages up to 120V. I've seen there are sensors that ...
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0answers
22 views

Measuring voltage on different grounds PV inverter

I'd like to create a voltage meter that can measure battery voltage and PV panel voltage. The only problem is that the PV input and Battery I/O doesn't share ground. I'm not sure if tying the grounds ...
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2answers
101 views

Measure voltage on 48 batteries at once using microcontroller

I am looking to design a microcontroller that can measure the voltages on 48 batteries. Some of the batteries will have floating voltages as the device is wired in a parallel string of 8 columns, with ...
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2answers
183 views

How to measure high DC voltage by micro-controller with an integrated approach?

Goal is to measure DC voltages in the 100-500VDC range, safely with a microcontroller (e.g. Arduino) The particular application is to monitor the voltage of a large Lithium series parallel battery ...
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2answers
43 views

k-type thermocouple with latency

Bought from here I have tried the magnet trick and it does not stick to either of the two wires of this TC. More so, screwing it inside an oven and turning the temperature up does produce some micro ...
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0answers
41 views

Drift in high resolution temperature measurement

For a calorimetry project, a precision temperature measurement (0.001 K resolution in the range of 15-25 °C) is required. Note that the absolute temperature accuracy is secondary, crucial is the ...
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0answers
44 views

Convert raw data recorded in python with sound card (ADC) to input voltage Vin

I am trying to convert the ADC output code recorded using the sounddevice module in python back to its physical voltage quantity, i.e trying to calculate Vin in my sound card's input. I am using a ...
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1answer
70 views

Hardware specification terminology

I have a hardware specification document of a product attached below. I am able to understand the following parameters: Input voltage - This is defined for the range of input voltage Resolution - ...
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0answers
57 views

Isolated Voltage Measurement

In my application I need to measure a voltage that is in the area of 50V, but my microcontroller has to be isolated from my power circuit. I came across the ACPL-C87A-000E IC. I followed the typical ...
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4answers
898 views

Is it possible to measure lightning discharges as Nikola Tesla? [closed]

Nikola Tesla stated in his patent, Art of Transmitting Electrical Energy Through Natural Medium, that he used sensitive instruments to measure lightning discharges: In the course of certain ...
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2answers
74 views

AC Voltage: Wild Reading: phase-neutral & neutral-ground (240V/120V)

I'm getting some unexpected readings when testing a circuit for my wall mounted AC&heat. I'm on standard USA 120V/240V split-phase/three-wire AC power; the specific circuit is 240V. here's a ...
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2answers
65 views

Real-time measurement of motors' current draw for a mobile robot

Found an Arduino-compatible Voltage-Current Sensor; it could remove the need for a separate voltage sensor. Is there a more recommended method to continuously and simultaneously measure the current-...
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0answers
64 views

1st KiCad design. Concerns with an abnormal circuit

I just wanted some input before sending this off for manufacture. It is for a test fixture and just has a funny circuit. Even though it seems relatively straight forward, it took a bit of finagling. ...
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1answer
71 views

Dynamic voltage divider

I'm trying to build an ESC (electronic speed controller) for three phase brushless motor. I found some intresting circuits but I am trying to build something very easy to do, with mosfet and pc817 and ...
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4answers
95 views

Voltage error when connecting a zener diode

I am working on a project where i need to measure the battery voltage and send the measurement to a uC, which is powered by 3.3V. The voltage divider is projected as shown before: As input we have ...
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46 views

Correcting DC offset in op-amp based controlled current source

In an attempt to develop an automated potentiometer measuring device I have implemented the following op-amp based voltage controlled current source, controlled by the output of a DAC. The voltage ...
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1answer
79 views

Individual Three Phase Potential Transformers vs Three Potential Transformers in one case

If I had to select between Individual Three Phase Potential Transformers vs Three Potential Transformers in one case for a 600V system (which doesn't require many inches of spacing between phases to ...
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0answers
31 views

check remaining charge of 28V 5Ah Li-ion battery via ESP32

I'm currently doing a project where I have to power some LEDs from a battery remotely. It's done with an ESP32 and the whole system is powered by a 28V 5Ah Li-ion battery. I am using a DCDC-Converter ...
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3answers
187 views

Why doesn't this battery voltage measurement circuit work? [closed]

So, I built this simple circuit for measuring voltage from a battery pack to an Arduino. The thing is, I want to measure the first cell and then the voltage from the whole battery pack: using two ...
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1answer
52 views

How to receive 40V-DC to 100V-DC range analog output into 9V-DC to 24V-DC analog input?

I am software guy and this is my first time here. So pardon me for my lack of understanding. I have a device with analog input, that can read analog input in the form of DC Voltage within the range ...
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3answers
54 views

Ambiguity in voltage measurement

So I watched this extremely fundamental video about voltage measurement and how it's measured. The one thing that confuses me is what people use a reference for zero potential. The two diagrams shown ...
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0answers
48 views

A general math problem that pertains to resistors in AC circuits

I've been reading from this website as a refresher on basic circuits and circuit components. I have no problem understanding the properties of resistors in circuits and how to calculate V, I, or R, ...
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2answers
125 views

Oscilloscope range affecting voltage reading

I am trying to measure the current usage of a device using an oscilloscope. Every second the device turns on for a few milliseconds and then goes back to sleep. I need to find how much current is ...
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0answers
25 views

Using a switching DC-DC converter in high dynamic range current/voltage sensing

I'm thinking of making a power meter circuit which will have a high-side current-sensing amp (LTC6102), a resistive voltage divider for sensing the voltage, a dual op-amp (OPA2365) as a buffer for the ...
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0answers
61 views

Circuit that averages voltage

Suppose we have an oscillating signal V(t) with V(t) >= 0. I'm looking for a circuit that averages this signal over a given time so that I can read out the average value directly using a simple ...
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1answer
47 views

Voltage drop across buck converter

In my robot, I plan to have a GPIO pin on my Raspberry Pi connected to the insertion detection pin (pin 3) of a barrel jack (schematic here) so that my code can tell when the robot is externally ...
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2answers
74 views

Elimination of interfering voltage

I have a problem deriving a formula I will be using in my bachelor thesis. It's about eliminating interfering voltages during measurement. To understand how the interfering voltage is going to be ...
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3answers
2k views

Determine voltage drop over 10G resistors with cheap multimeter

I have two 10G resistors connected in series with a 3V battery. I want to determine the voltage drop across one of them, which of course is 1.5V. When I use my multimeter to check the voltage drop, it ...
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3answers
331 views

The Ohm's law calculations of the parts do not agree with the whole

In the circuit below, the Ohm's law calculations of the parts do not agree with the whole: the voltage drops of the parts do not add up to the total voltage, and the current does not calculate to be ...
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3answers
87 views

How to measure voltage of each bank in a Marx Generator?

If I have a 10 stage Marx generator with each stage at 2.5kV, when I erect all the stages the last stage's negative terminal will be at 22.5kV with respect to ground. If I want a voltage ...
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2answers
44 views

DC test equipment to see voltage extremes? [closed]

I want to experiment with magnets and coils to produce voltage. I need test equipment to find the highest positive voltages and the lowest negative voltages obtained during tests. My needle driven ...
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0answers
55 views

20 kV 100 mA Voltage Current Sensor

like the title says, i need to measure 20 kV 100 mA line. For the voltage part i found this:http://www.koncar-mjt.hr/en/docs/koncarmjtEN/documents/61/1_0/Original.pdf and this:https://www.hivolt.de/...
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3answers
6k views

How do I measure a voltage greater than 5 V with Arduino? [duplicate]

I want to measure a varying voltage with an Arduino and real time data plotting has to be done. But the supply voltage will be 10 V and the Arduino is not supposed to have more than 5 V. Is there a ...