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Act of measuring voltage

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I know disconnecting earth plug of oscilloscope is viable way to measure Line voltage with passive probes. But it is a hassle to prevent and un-prevent Earth connection for each time I make a quick ...
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I am using a resistor divider of 523 kΩ on the high side and 10 kΩ on the low side. Using an STM32 microcontroller to read the voltage of the supply. How is the voltage actually being converted to ADC ...
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My application requires a high accuracy reading for DC voltage and current. DC voltage max is about 60 V and DC current max is about 140 A. Currently I am using a 1 mΩ shunt(CSS2H-3920R-1L00F), for ...
Gokul Karthik's user avatar
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7 votes
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I recently came across the TIDA-060029 documentation from Texas Instruments (auto-balancing impedance measurement), and I’m not fully sure whether the method used in that design is 2-wire or 4-wire. ...
msch's user avatar
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I’m currently designing an electrical circuit to measure the voltage level of a PWM signal as part of my studies. I’m in my third year of a Bachelor’s degree in France, in a program called Electrical ...
Filo's user avatar
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I came across a circuit module that uses a voltage divider to measure the value of a resistive sensor. However, unlike a simple divider made of two resistors, this one also includes a capacitor ...
user386164's user avatar
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Background: I am working on a project of modernizing a system for a lead acid battery charger. I will do this with a Vienna rectifier, that needs the current angle, that I get from a PLL, for control. ...
miha medved's user avatar
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I am dealing with a setup where resistance of a resistive DUT (Device Under Test) is measured by sourcing some current through the DUT from a current source and by measuring the voltage drop across ...
Bee16's user avatar
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I am trying to measure the current through a diode in terms of voltage across a 100 Ohm resistor, as the voltage at the anode of the diode varies. But when I connect the GND probe of the oscilloscope ...
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Tl;dr: is my attempt at protective impedance on neutral going to render my system inoperable or unsafe? I'm looking for some feedback on a modification I am planning to incorporate into a design based ...
IamNearl's user avatar
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1 answer
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It is almost obvious the need for voltage transformers in a high voltage substation for measurement and protection, but a substation that interconnects 2 systems, one of 57.5 KV and another of 115 KV, ...
Santiago Celis Patiño's user avatar
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I'm designing a PCB for a drone and I'd like to add 4 LEDs that indicate battery voltage. I could do this with the microprocessor I'm using but I am interested in making a circuit that can quantize ...
Ethan Silver's user avatar
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This paper (paywalled) describes the above circuit which measures (transduces) V1 as: The total capacitance of the swing capacitor, $$\mathrm{C}_{\Sigma}=\mathrm{C1}(\mathrm{t})+\mathrm{C2} > (\...
Tomi's user avatar
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I am working on a electro adhesion project that requires me to use a HV generator that can output up to 11kV DC. But the details of the input/output voltages are unclear and I am not even sure it can ...
Vaynxe's user avatar
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1 answer
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I have an AC waveform that can rise to about 120V peak and 10A at a variable frequency between 50-150kHz. I would like to use something like an optocoupler to scale this voltage to something logic-...
diego's user avatar
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I’m working on a voltage stabilizer project using a Nuvoton MS51FB9AE microcontroller, and I’m confused about how my input voltage measurement circuit handles a range of 240V AC to 300V AC, 50 Hz. The ...
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I've bought a small three-wire voltmeter. Its photo is shown below. The online shop doesn't have any information or a datasheet. I have the following questions: What component is missing, indicated ...
the Hutt's user avatar
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What is the gain of this LM358 circuit? How to calculate or simulate it? any help is greatly appreciated
tdjprog's user avatar
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I am trying to measure the \$g_{fs}\$ (forward transconductance) of a 2N7000 MOSFET. The datasheet gives the following conditions for the measurement, \$V_{ds} = 10V\$, \$I_d=200 mA\$. I know that \$...
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I am constructing an analog voltage measurement device that accepts signals up to +/- 10V as input, applies amplification and shifting (to condition either +/-1V range or +/-10V range to 0.5V -> 4....
JustAbotRite's user avatar
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I am trying to measure the saturation voltage of a bipolar transistor (SS8050), using a Keithley source-meter, the measurement does not measure the voltage between base and emitter correctly, with a ...
wewq ewqewq's user avatar
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I am trying to record the output of a voltage divider using an audio card. The voltage divider (potentiometer) is a stand in for any sensor whose output is a variation in voltage. Audio recordings ...
fdcpp's user avatar
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The INA219 breakout was wired as follows: VCC was connected to the Arduino’s 5 V supply, GND to the Arduino ground, SDA to pin 20, and SCL to pin 21. The module’s Vin+ and Vin– terminals were ...
きゅん's user avatar
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I have been looking at a series of isolation amplifiers from TI, but they are divided in 'current sensing' and 'voltage categories, when we sense current we actually sense voltage, so why do the ICs ...
Bee16's user avatar
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Wikipedia has an article and the following picture. The needle is pointed left, can I assume the positive terminal is more negative than the negative terminal? I.e. polarity of the battery to ...
atod's user avatar
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3 answers
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I will perform a short circuit test for a high rate battery, using a contactor that can handle the high rate current (GIGAVAC - HX series) to switch the short circuit cable. At the same time, I want ...
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I’m developing cable pinout tester with functionality of resistance measurement, but I’ve faced with some challenges. Using MCU (STM32) I want to go through all the combinations by selecting MUXs ...
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I am looking at isolated voltage measurement circuit: Reference Design Guide There is a voltage measurement circuit on page 19, however, I cannot understand the purpose of resistors R65 or R50. One ...
Typeof undefined's user avatar
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1 answer
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I am working on a BLDC motor driver and when I examine the bottom right of schematic, I've noticed that U_BEMF output is on end of R9 resistor. Are R8 and R9 forming a voltage divider? May they put ...
Melisa's user avatar
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1 answer
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Background: I am designing a test board to measure the voltages from multiple point of the target board (DUT). I am using 2 pair of mux to toggle between the pairs. One mux (mux506ipwr from TI) is ...
Tay's user avatar
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2 answers
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Designing a data acquisition and display system based on an iMXRT1062. My current voltmeter design measures the voltage on the main bus of the vehicle with an ADS1115 feeding the iMXRT. Unfortunately, ...
Andrew Meyer's user avatar
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1 answer
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For a relatively weak electrical grid, let's say 20 MW (precise value is not important), I want to develop a measuring system for monitoring the voltage and save the waveform (as timeseries signal), ...
thece's user avatar
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-2 votes
1 answer
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When I measure the voltages to GND I get the following: Anode: 3.3 V Cathode: 1.75 V However when I try to measure the voltage directly across it connecting the multimeter to the two terminals it ...
Márton Gáspár's user avatar
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In the process of researching the documentation for the MCP3914 chip, I had a question about the possibility of measuring negative voltages. The reference voltage generated inside the chip is +1.2 ...
Typeof undefined's user avatar
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I've written a very simple program for my ESP32: ...
user2190492's user avatar
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I'm trying to find the current-voltage characteristic of a red LED diode in the biggest possible range using five 3 V batteries, one 100 Ω resistor and ten diodes, but my graph is wrong: The ...
Olivier's user avatar
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4 votes
5 answers
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I'm trying to measure a differential DC voltage range of -1V to 1V using an ADS1115 connected to an ESP32. I’ve implemented a voltage divider circuit based on a design suggested by Joseph W in this TI ...
neospice's user avatar
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I've been having some trouble getting my below voltage to frequency converter to work as intended. Before anyone says this, I will say that I expect the frequency to be non-linear in proportion to the ...
jamesbray's user avatar
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4 votes
1 answer
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I do have a problem with my C128D PSU, and with some help from others I think I may have identified that it must be on the primary side (230V) of things. It seems not to provide any voltage for the <...
Beauvais's user avatar
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2 answers
236 views

I am sitting with a situation where we have a device that keeps failing (12v DC). I am measuring between 94v and 110v AC between the negative terminal of the DC power supply and the earth of the metal ...
Pieter Gouws's user avatar
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0 votes
2 answers
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This product can measure the voltage of an electrical fence used to control livestock without any external grounding. The fence's ground is the earth whilst the voltmeter's ground is the negative pole ...
RWeiser's user avatar
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1 vote
1 answer
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I am new on ADS so i'm still trying to learn but now having some problems with simulating the full wave rectifier circuit on the first image. The diode does not pass the voltage through. I have tried ...
Semi Bertuğ Çağ's user avatar
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3 votes
2 answers
306 views

I am designing a digital circuit based on STM32H743G. There is a 600V AC motor in the application and 3 parallel lines from the 3 phases are entering to the PCB. I have to find a way to measure the ...
jonathan eslava's user avatar
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0 answers
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Is there any way to improve the resolution of INA260 module to uA and uV? It's an amp and volt meter with a resolution of 1mA 1mV Datasheet: https://www.ti.com/lit/gpn/INA260
user23328818's user avatar
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I am designing a Power Monitoring and Protection board that is going to sit in between a 5-Series (~70V) Lead Acid Battery and a load. This board has a Energy Monitoring IC from TI - INA237AQDGSRQ1 ...
Abhijith V Narayan's user avatar
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3 votes
3 answers
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I have a three-phase generator and I want to measure the voltages of each of the phases, but I don't have a neutral point. How would I connect the phases to an ADC, and how would I make a voltage ...
Lopfi's user avatar
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0 votes
2 answers
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I am using the following circuit to measure DC voltage that is up to 18V, and I was wondering if there's a way to make it able to measure negative DC voltage down to -18V as well:
Shamooooot's user avatar
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2 votes
2 answers
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RMS is root mean square, peak to peak is the difference between peaks of a signal. In the video and other places, they say the 1 mVRMS = 6.6 mVpk-pk. The reason is 6.6 standard deviations covers 99% ...
scot123's user avatar
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3 votes
2 answers
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I am a mechanical engineer by trade, so please correct my assumptions if they are wrong. I'm designing a test rig for my company's electrolyzer design. The electrolyzer will have anywhere from 128-200 ...
Matthew Easterling's user avatar
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3 answers
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Question: Joe was debugging part of an experimental apparatus, probing around with his voltmeter. Part of the apparatus had two obvious resistors in series with an unknown element, as shown in the ...
Jason's user avatar
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