Questions tagged [voltage-measurement]

Act of measuring voltage

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How do I properly wire an SL-510-SS pyrgeometer to measure its internal thermistor resistance?

I've acquired an SL-510-SS pyrgeometer and am having trouble wiring the internal thermistor. The manual gives the following description: The manual also provides the following diagram: I've ...
DaleCloudman's user avatar
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High current/voltage power monitoring in small form factor

I am attempting to build an I/O board to integrate with software I have running on a Raspberry Pi 4. I need the board to monitor voltage and current (power would be a bonus) on 8 circuits running ...
Eric Lindsey's user avatar
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ADC reading unstable at high current [closed]

What could be the reason and possible solution, for my ADC measurement on the microcontroller increasing more than the actual values, when high current is going through the circuit? I had just ...
Peace's user avatar
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Microcontroller that can do 10 UART? [closed]

I am currently working on a project that would require a total of 10 UART (rx and tx pins) to run 10 PZEM-004Ts for different electrical lines. I am thinking of using an atmega 2560 because it has ...
Newb's user avatar
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Coax cables, impedance matching and BNC extensions

I'm trying to understand how to do proper measurements with a Voltage Differential Probe ( TT-SI 9010. This probe has an output impedance of 50ohm and has a BNC (It doesn't specify it in the data ...
Santi Ospina's user avatar
2 votes
2 answers
288 views

Measurement of high voltage

For research lab work, we use a high-voltage generator to create one pulse with a low intensity (< 4 mA). The voltage range is variable from 100 V to 3000 V and the FWHM of the pulse is ~1 ms. The ...
ludo's user avatar
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Why might my circuit's measured voltage drop when I add more load to it?

I have one of these power supplies: I also have an MCR-4V data logger: If I connect wires directly from the power supply to the data logger (red to red, black to black), then the voltage output on ...
DaleCloudman's user avatar
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On working principal of the low DC voltage charger of this certain behavior

How is the simple working mechanism or principal of the DC stage of a typically low DC voltage, ~ 5V, charger with the behavior: if a MM simply testing its voltage it gives 0 volt if a battery is ...
itil nonok's user avatar
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3 answers
118 views

Circuit for averaging AC voltage

I made a rl multivibrator with square wave output. The ton and toff of rl changes with magnetic field around. Normally the wave is symmetrical but on passage of magnetic flux, the pulse width changes ...
Saso's user avatar
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Flyback transformer -measurement of average voltage

Consider buck-boost converter using self-osc. driving, in critical conduction mode, so the duty changes according Vin and Load. Does measuring the Vx as it is shown between collector and +Vcc, ...
Michal Podmanický's user avatar
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1 answer
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How to check the high voltage of a electrostatic device?

I want to build a device with two metal plates which needs to have 3000 VDC between them. The way that I am thinking is to use a ferrite transformer from a 9 VDC transformer with a transistor that ...
plopper's user avatar
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How to perform Kirchhoff's Voltage Law on an open circuit? [closed]

I am wondering how to perform KVL on an open circuit. For V_s = 10V, I have determined the V across R2 to be 10 Ohms but am confused about R3. The algebraic sum of the voltages around any closed loop ...
9_daytona's user avatar
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KY038 sound sensor: Voltage to SPL

I'm writing code to measure frequencies with a KY038 microphone sound sensor. It uses an LM393 voltage comparator. How do I convert voltage to sound pressure level (SPL)?
HAMZA SAVAI's user avatar
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Measure transformer real power

I’m new at making transformers myself, and the ones that I designed had the correct output voltage, and when they were connected to batteries (previously rectified), they give me a an approximate of ...
samuel mattio's user avatar
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1 answer
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What type of galvanometer is in this picture?

Does anyone understand the galvanometer in Faraday's experiment to the left in the picture below? How does it operate? It looks like it uses a magnet and some xy axis the needle swings over or maybe ...
Nick's user avatar
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6 answers
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Are there any tricks for measuring high voltages (~1000 V) efficiently?

The simple way to measure voltages above VDD is to use a resistor divider. However, once you get into the 100s of volts these dissipate significant power. For example, one of my current designs ...
Drew's user avatar
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Uncertainty for measuring a resistor

I am trying to calculate the uncertainty of a measure on a resistor. The expected value of the resistor is 45 mΩ. For measuring the resistor I used the two following instruments: SM500-CP-90 Agilent ...
Jess's user avatar
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How to extract voltage and current from this real-life circuit (with resistors)

I recently measured some voltages across two resistors as you can see in the images below. I used a triangle wave as voltage source and measured the voltages across the resistors with an oscilloscope. ...
Leon's user avatar
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Output voltage not changing with a constant current driver

If I attach a voltmeter to the output of this constant current driver and lower or raise the input voltage (100-230V,) the output voltage remains constant at 56V. Should it not fluctuate between 40-...
Guit4eva's user avatar
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2 votes
2 answers
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Why is the voltage across the LED negative, when the entire drop is positive?

I was changing the control board of my 3D printer. When testing the heatbed, I saw that the LED wasn't glowing (as with the old control board), when the heatbed was turned on. So I investigated with ...
JoeyD's user avatar
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2 answers
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Which is the best method to measure AC voltage?

I am trying to make a UPS circuit. I need to have a high speed measurement for the input AC voltage (220 Vrms) (in order to know whether to turn on/off the inverter). I had tried using this circuit: ...
Hazardous Voltage's user avatar
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Which filter to use when measuring the voltage power line, common mode filter and/or differential mode filter?

I'm using an 78M6631 IC for three phase metering. For voltage measurement, the datasheet recommends a voltage divider. Researching through internet is recommended to include a filter, I don't get when ...
Martrel's user avatar
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4 answers
130 views

Isolated voltage measurement circuit or sensor

Which circuit or sensor can measure a voltage range of 24 V DC (the power supply for a motor)? The circuit is fully galvanically isolated from the ESP32 used. Does anyone have any ideas on how to ...
Yukta Sanghvi's user avatar
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1 answer
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Current leakage when measuring battery voltage via Raspberry Pi and MCP3002

I have a project involving the following components: Raspberry Pi Zero W MCP3002 (Datasheet) Adafruit PowerBoost 500C (using a TPS61090) The Setup: The MCP3002 is connected to the Pi via SPI0 (pins ...
Ryan S's user avatar
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Eliminating Negative Voltage Pulses (≤ 840 mV)

I have obtained a voltage signal from a Weigand sensor (a sensor that creates a low voltage signal when placed in a rotating alternate magnetic field), which generates a positive pulse of 1.2 V and ...
Taimoor Malik's user avatar
3 votes
4 answers
1k views

Max amps and voltage CAT5e

I have CAT 5e running throughout a house. Trying to use the wiring to connect a CCTV camera. The camera says it uses 500 mA and needs a 12 V adapter. I do not know if it needs a full 12 V to run. I ...
Lefty's user avatar
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Parallel/Series Resistors Voltage measurement

I want to know the value of the resistors here. There are three conditions in this picture. Its getting really hard to fulfil the correct resistor values. Thats why i decided to post it here
Zunuran Nasrullah's user avatar
11 votes
9 answers
2k views

Is it feasible to measure voltage drop across 0-ohm jumper resistors to determine excessive current draw?

We design very low-power devices which in standby mode use about 8 µA of current. They are powered by 3 V lithium primary cells and are designed to last for many years. Every now and then we see a ...
JYelton's user avatar
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How to capture a damped sine wave with an oscilloscope?

Basically what I'm doing is feeding a resonator with a sine wave at roughly 1 MHz coming from a signal generator for a certain time T. After that, I'm switching off the signal generator and what I ...
Adrian's user avatar
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PAC1921 power monitor issue

I'm trying to measure voltage, current and power by PAC1921 IC. This is a PAC1921 datasheet: PAC1921 DataSheet This is my schematic: 3.3V_Input is input from simple AMS1117 3.3 V regulator and +3.3 V ...
Alatriste's user avatar
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INA226 Vbus voltage reading has a 1.5% error on all measured voltages

I have an INA226 module with a 0.1 Ohm shunt resistor, here's the schematic: Device powered from 3.3V (ESP32 regulator's voltage). Since I only wanted to test the voltage monitoring function, I ...
AlectronicZ's user avatar
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1 answer
84 views

Observed voltage unexpected in simple test circuit with one resistor

I have a 1.65v regulated source (max 50mA). I'm observing 1.71v with no load. I've added a 178 ohm resistor (verified with VOM). I'm observing 1.60v 9mA across the resistor pins. V = IR; V = .009A x ...
torpedo51's user avatar
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Measuring 12V car battery voltage precisely from the output of an ideal diode controller

I'm designing a device that will be plugged into the OBD2-port. One of the features is reading the battery voltage on demand directly from the diagnostics port. In order to protect the device from a ...
AlectronicZ's user avatar
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2 answers
79 views

Comparator as a current detector with shunt resistor v2

I have a comparator with a shunt resistor that measures the voltage and when the voltage of 12 V from the source exceeds the Vref (1 V in my case) it switches to "high" output. I would like ...
Simplifier's user avatar
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1 answer
125 views

Comparator as a current detector with shunt resistor

I would like to design in OrCAD a comparator with a shunt resistor that will measure the voltage and when the voltage value is exceeded it will flip. I have designed the comparator but I don't know ...
Simplifier's user avatar
1 vote
1 answer
126 views

Peak voltmeter detector explanation

I'm designing a peak sinusoidal and impulse detector, based on the old design of a peak voltmeter designed by Haefely. I have the schematic, but I can't understand how this circuit works. The large ...
juliancaba's user avatar
1 vote
1 answer
167 views

Transformer ratio changes when varying voltage on primary

I want to measure mains voltage using a transformer. bought a 9V transformer, removed the secondary and rewind it with 10 turns that gives me 2mV per volt 1:500. The problem is that the ratio is not ...
ElectronSurf's user avatar
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3 votes
4 answers
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When I attempt to measure Vbc for the circuit below, the LED partially illuminates when the switch is open. Can someone explain why please?

When I measure Vb relative to ground I get a value of 0.00V and with Vc relative to ground I get a value of 7.15V when the circuit is open. Subtracting Vc from Vb I obtain -7.15V for Vbc which is ...
J R's user avatar
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2 answers
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Circuit for Reading Power Supply Voltage with Micro ADC

I am working on a project where I need a microcontroller ADC (3.3V range) to detect the voltage being put out by a 24V variable power supply. This is the circuit I came up with to accomplish this: ...
Emmett Palaima's user avatar
1 vote
1 answer
75 views

Troubleshooting an Electrical Circuit - Is This an Expected Voltage Drop?

I am troubleshooting an electrical problem and am having trouble understanding the readings I am seeing on my digital multimeter. I am a DIYer with just the basics of electrical engineering knowledge,...
lp1756's user avatar
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2 votes
2 answers
96 views

How do I measure the noise at the top of a square wave?

I am trying to get a good measurement of the "quality" of a square wave, both in its flatness and lack of noise at both high and low levels. Low level is easy, just use a preamp and zoom way ...
rspaudio's user avatar
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1 answer
674 views

Monitoring external battery voltage with ESP32

I'm trying to monitor a battery that is unrelated to my ESP32. The battery powers my gate and the ESP32 is powered by POE. The battery is a 12v battery. I am using a voltage divider and the ADC to ...
Paul B's user avatar
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1 vote
2 answers
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How do I best protect a PLC and power supplies from voltage and current spikes coming from actuated components?

Problem My PLC is getting voltage spikes in the onboard ADC readings when I turn on actuated components elsewhere in my electrical system. I need to protect my PLC from these spikes because they ...
Jman's user avatar
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0 answers
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How to properly measure the power being delivered to a BLDC?

There's a battery connected to an ESC, connected to the Motor, coupled to a Dyno. How can I measure the electrical power going into the BLDC? As far as I'm concerned a simple measurement of line ...
Je parle avec toi's user avatar
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1 answer
31 views

Measuring voltage but no power with DMM

Hello guys i am a novice electronic engineer and i run up to a question on some troubleshooting i was doing. I have an old audio door phone system that has 2 designed outputs for the 12VAC electric ...
j_pentester's user avatar
0 votes
2 answers
335 views

UC3842 IC not working

I have a simple UC3842 IC and I want to test that. First I used the open loop circuit from the datasheet but it didn't work therefore I went through the datasheet again and found from the schematic ...
kam1212's user avatar
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2 answers
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Can I measure pinholes in a dielectric layer using LCR meter?

I have a thin dielectric film (~1 um) and I want to measure the quality of the film in terms of not allowing leakage current through pinholes. Can I use an LCR meter for this purpose? If yes, how? If ...
SNIreaPER's user avatar
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0 answers
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How to measure the electrical properties to ensure the performance of a thin electrode/insulator stack-up?

I am a mechanical engineer by trade, and I am looking at some basic electrical properties that I need to measure to ensure the device meets the desired performance. The device consists of a two-layer ...
SNIreaPER's user avatar
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2 answers
317 views

Why would my true RMS multimeter give me a different AC voltage reading than my scope at frequencies above 2 kHz?

Here’s the circuit and my problem. My function generator is simply parallel connected to a multimeter and my scope. No load is connected and I am not using a scope probe, just a BNC connector with ...
Mike Meschi's user avatar
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0 answers
41 views

Pipe to Soil Potential Measurement

I want to measure pipe to soil potential using a microcontroller. Generally, the potential difference between pipe to soil is negative. I found this circuit online. Is this circuit correct for ...
Mehedi's user avatar
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