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Questions tagged [measurement]

Measurement is the assignment of numbers to objects or events. All measurements consist of three parts: magnitude, dimensions (units) and uncertainty.

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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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7 views

Hspice : find max of measurement result in Hspice

i need to calculate efficiency of a circuit for diffrent parameters and then, find MAX of these efficiencies in Hspice.( also related parameters that refers to it) i ran i .DATA transient simulation,...
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1answer
41 views

Correct way to ground components for solar panel measurement

I'm currently doing a project where I'm supposed to measure the current and the voltage from a solar panel and am unsure of how I should ground all the components in the circuit (since electrical ...
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61 views

Photodiode to detect light

For a university purpose I am preparing a project, actually I am thinking of using a photodiode in reverse bias in order to measure intensity of light. I divided this project in some phases: 1) ...
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1answer
53 views

Reading digital wafevorms via VXI11 from the LeCroy wavesurfer 510/MS-500

I automating a test with an osciloscope via VXI11 with python's vxi11 package. I am using the remote control manual given by LeCroy. I am trying now to extract the raw Waveformdata according to page ...
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1answer
54 views

Measuring integrated current

I want to measure the amount of light striking a photodiode in a specific time window (about 1ms). In this window, we get \$10^6-10^7\$ photons, which get converted into electrons with about 80% ...
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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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1answer
64 views

What instrument is used for measuring very low current / voltage? [closed]

I'm wondering whether galvanometer can be used or not ?
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1answer
24 views

Resistance measurement and standard uncertainty

In a text there is a section regarding a basic example for uncertainty calculation of a resistor. Here is the related part: Above the text uses the the accuracy of the current source and the ...
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1answer
49 views

What is the correct name of a job involving mainly programming measurement instruments and making measurements on electronic components? [closed]

While revisioning my resume I found out that I do not know what is the industry standard name of one of my previous job. I simply called it "Software developer" but I don't think it fits properly. ...
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1answer
57 views

Impedance/capacitance measurements

I'm trying to do some impedance measurements on passive components with the simple circuit shown below. I find it difficult to make sense of the results and hope somebody can help me understand what I'...
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1answer
65 views

High PWM frequency weird shape

Using a STM32F407 if I generate a 200 Hz signal it looks like this: If I want a higher frequency, for instance 10 kHz I get this: I am using a PicoScope 2205A, resolution 8 bits at 200Ms/s, ...
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2answers
92 views

How to take resistance reading when value is effected by measurement?

Context I am trying to measure the wiper resistance of a potentiometer. This is performed by leaving the potentiometer wiper in one position, and measuring from each terminal to the wiper (\$R_1\$ ...
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1answer
33 views

Measure pulse width generated in one pulse mode using HAL

I need to generate pulse in one pulse mode and measure width of this pulse using HAL. I'm using STM32F446RE board. I managed to configure timer to generate pulse but I have no idea how to implement ...
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2answers
155 views

How do induction cookers measure temperature?

This is not exactly about electrical circuitry, but I hope it's close enough not to get me kicked out. Please redirect me if necessary. Almost all induction tops advertise possibility to "keep ...
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0answers
81 views

Wrong measurement of DSO-5200A?

I'm using a DSO-5200A from Voltcraft and noticed the voltage measurement represented incorrectly (it is doubled). Any ideas how to reset this? Channel 1 (green) measures a (noisy) 5V and has a Vmean ...
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2answers
127 views

Is there any way to noninvasively/invasively measure the current/voltage (Power) to get actual power consumed by load?

One of the application im working on needs three phase power measurement to be done through micro-controller. The power measurement is in the range of 90kVA. Is there any way to noninvasively/...
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4answers
492 views

Converting ADC output to real values [closed]

On a custom board I have an ADC which measures -5V to +5V. And outputs in Hex via SPI like this: ...
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0answers
57 views

How to eliminate oscilloscope channel DC bias

When I set channel 1 as DC coupling, there is always -5.6v bias, even no cable is connected. Can someone tell me how can I eliminate this bias? Thank you
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2answers
95 views

Count car weels without using visible light (camera/laser etc) and without interaction [closed]

For this project we need to count weels of a car (if possible at all), one side only. The scenario is within the following scope: The car is always passing in a straight line It is cars only, so all ...
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3answers
104 views

Sensors to detect vehicle height from the side

I am looking for a way to determine vehicle height measured from the side. The application is for a drive-through ATM, the sensors being mounted inside the ATM enclosure. Some ATMs have a roof as ...
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0answers
48 views

Amplifying pulse signals causing pulse lengthening problems

I am currently trying to design a circuit that would sense a voltage change at its input, convert that change into rapid "on"/"off" change at output and amplify same switching voltage to high current (...
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1answer
47 views

Differences in voltage measurement at the input of a circuit

I am trying to understand the difference I am seeing in voltage signals, that I am applying to my circuit's input. So the basic layout is shown in the diagram, I have a connection, A from my function ...
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1answer
64 views

How to measure the impedance of a given coil? [duplicate]

What's the best way to measure the resistance and inductance of a coil at a given frequency? I need these parameters for my LTSpice-Simulation which assumes an RL series circuit. The coil has 8 ...
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3answers
1k views

Methods to measure inductance with high (1%) precision using standard equipment?

I am modeling the fine behavior of interacting oscillatory circuits. I have looked up a couple of methods for measuring inductance. I believe I am following the procedure faithfully, but the values I ...
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4answers
1k views

Why do LCR meter manufacturers give the details of measurement frequency to us?

When you want to purchase a DMM, more probably you don't see at what frequency the DMM you considered would work, but in the situation you're considering to purchase an LCR meter, manufacturers give ...
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0answers
30 views

Can I use a RF and/or Time-domain reflectometer to find 'wet contact'?

Friends of mine have a circuit where the RCD trips but only after prolonged rain. There are a number of garden and security lights on that circuit so I very much suspect there is a junction box where ...
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2answers
103 views

How isolation is achieved in isolated channel oscilloscopes?

I tried to search something about this but found only a small amount of information. What confuses me is that all isolation amplifiers, optocouplers etc. I could find usually work at much lower ...
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0answers
84 views

Darlington Transistor TIP142 same type but different values

I have a bunch of Darlington NPN Transistors TIP142 that are removed from two separate identical boards. The 1st one have the TO−218 CASE (left side of the image) and the 2nd the TO−247 CASE (right ...
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0answers
60 views

Measuring current in the case of bridge amplifier at several MHz

Is there a way (or some chip) to measure current at about 5 MHz when the bridge amplifier is used? The output is a sine with amplitude 15 V. I need to measure accurately both amplitude and phase (the ...
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1answer
63 views

How can I make my measurements of full-wave rectified AC using an A/D match a Fluke meter on its DC range?

I am trying to measure the DC voltage of a full-wave rectified 60Hz AC signal using an A/D and have it match what a Fluke meter reads on its DC scale. My current approach is to take as many (16 bit) ...
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1answer
31 views

Measuring a magnetic pulse using a coil, and circuit adjustments

I have the following circuit, I am using it to create a pulsed magnetic field, in the coil. I am trying to measure and verify the magnetic field in the coil. I am testing it with 40 V to drive the ...
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2answers
85 views

Non-intrusive measurement of current and voltage

Sorry if this question is too basic for this forum... I'm an interested amateur but far from a professional. I'd really appreciate information from someone more informed than myself. Hypothetical ...
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2answers
102 views

Measuring Inductance

I have been looking the number of methods to measure inductance of a coil if you don't have an LCR meter available, and I have had some difficulty. I designed and built a coil and I would like to ...
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3answers
105 views

Which components can be measured while soldered on a PCB board already?

I am assembling nonlinear oscillators on PCB boards for applied math research [Colpitts (100 kHz, 3 V_pp), FitzHugh-Nagumo (100 kHz, 15 V_pp)]. I am working with some other people that want to do ODE ...
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1answer
66 views

Measurements using spectrum analyzer

I need to measure the following characteristics of a frequency synthesizer using a spectrum analyzer: Frequency range: 2.286 GHz to 2.346 GHz Output power: -2.5 dBm to 2.5 dBm SSB phase noise: ...
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1answer
36 views

Voltage Measurement with ST Microcontroller

I want to measure DC voltages from 1mV to 10V. I will be using STM32L053C8T6 Discovery board. I want to use 3.3V reference voltage. I know that if you want to measure voltages bigger than reference ...
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1answer
44 views

Measuring Frequency Synthesizer specifications

I need to measure all the electrical specifications of the Frequency Synthesizer KSN-2346A+ from Mini Circuits that appears in this datasheet: https://www.minicircuits.com/pdfs/KSN-2346A+.pdf but the ...
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1answer
42 views

Series/parallel combination of resistance/capacitance in an RC circuit (wrt LCR meter readings)

I have this equivalent circuit I am working on. I have to find out individual values of all components in it. I can measure resistance, capacitance and impedance of the whole circuit. I am not sure ...
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4answers
80 views

Oscilloscope coupling and effects on the measured signal

I have a basic understanding of the of coupling settings on an oscilloscope, but I need some help to understand what I am seeing on scope. I have a signal generator, with an arbitrary function set, a ...
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1answer
53 views

Problem in LC series resonance

I'm trying to experimentally verify my calculations on resonance on a simple series LC circuit. To prove resonance, I'm measuring the amplitude on the series resistor. When the amplitude is the ...
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2answers
187 views

Estimating torque of AC motor

Given voltage, measured current draw, and RPMs of an AC motor, and an estimated efficiency rating, is it possible to calculate the actual instantaneous output torque? Or is other information required? ...
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2answers
152 views

Oscilloscope: when to use coaxial instead of probes?

I understand the difference between passive and active probes, and between x1, x10, x100, ... I also understand that at high frequencies the capacitance of the oscilloscope has to be considered, so a ...
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1answer
50 views

RF measurement setup

I'm trying to take a simple measurement of ~2.4 GHz (WiFi land) with an RF spectrum analyzer (Tektronix RSA607A) but have so far been unsuccessful. On the RF In ...
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1answer
114 views

Measuring phase shift between current and voltage with microcontroller

I am trying to understand how this design is used to measure phase shift between current and voltage of an AC signal. From my understand there should be a PWM signal generated on the output. Resistors ...
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4answers
233 views

Multimeter, outlet and a Spark: the question of simple Voltage measurement

So I got a TekPower TP4000ZC MultiMeter. (Image source) It has COM port and two red ports: V-Ohm-etc. set at 600V Max and 500mA Max Fused 10A red fused port. Unlike other multimeters, there are no ...
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1answer
104 views

Zero-crossing in AC with DC offset signal

Introduction I have a project about measuring the voltage, current and power factor of an electrical system. I had designed a system that allows the microcontroller to measure the peak of an AC with ...
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1answer
44 views

R&S Spectrum Analyzer Voltage Measurement Error

I just got FPC1000 spectrum analyzer that goes from 5 kHz to 1 GHz. I didn't had any spectrum analyzer experiences before this one so everything is very new to me. Among few things that I don't ...
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1answer
135 views

How to measure a 100 ohm differential signal on a spectrum analyzer?

I have a pair of 1.5V PCML differential signals coming out of an Altera Cyclone V GX FPGA, terminated on the FPGA in 100 ohms with common mode voltage = 0.65V (also provided on the chip). I need to ...
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2answers
97 views

Measuring 0805 Capacitor values under 1nF

Other than investing in an expensive tweezer type meter for SMD components, what would be a good method for the layman to find the capacitance of an 0805 ceramic capacitor whose value is below 1nF? My ...