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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59 views

How to measure -170 dB GPS signal with spectrum analyzer

I'm looking for a way to measure noise signals (probably MCU harmonics) that affect the performance of my GPS receiver (Ubox sam-m8q-0-10). Can anyone point me to the right direction? I own a ...
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29 views

Is there a way to check if one or some of multiple lines is broken?

There is a product whose soldering process is often unreliable, and it has more than 50 I/O interfaces. Some of them should be shorted, and some are independent. I used to test it by a multimeter ...
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48 views

Accurately Measuring AC Voltage

I’m curious to see if anyone has any experience on the accuracy differences in measuring 120V-277VAC in the following ohmic ways. In all cases, the voltage would be put through a voltage divider to ...
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10 views

Digital measurement of dissipation factor for HV transformers

I am reading some documents on how to calculate and measure the dissipation factor tor tan delta by using the digital measurement and here is the link. After reading first what is the dissipation ...
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311 views

Acoustic localization

I apologize if this is not really an EE question, but it seemed most appropriate. I am considering the following application. Object is 3000m far away and emits a sound of 94 dBSPL at 0.5m, I, ...
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84 views

Accurately measure high quality factor coils

What would be the most suitable way to measure the quality factor of high-Q coils under the following conditions? Specifications Frequency: 5 MHz to 15 MHz, the target application is wireless ...
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3answers
73 views

measurement errors: add up or cancel out?

Take an accelerometer, or a hall sensor, or a thermometer, or any sensor. It will have an accuracy, which means the readings will contain some error of this sort. My guess is that by taking a big ...
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1answer
41 views

LCR meter defect - preventive actions

I got my hands on a BK880 LCR meter and now it's the second time that I destroyed the device. It can't hold the measurement voltage - So it always tries to measure with around 0V. What I am doing ...
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1answer
45 views

How to sense a small current while handling larger ones

For one of the projects I'm working on, I need to monitor a DC power line for reverse current; the solution has to output a 24V signal when around 10A or more of current is flowing in reverse through ...
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2answers
66 views

Capacitor measurement in existing circuit

I am searching for the cap load formula of C2 of the following circuit: In the end I want to be able to determine the capacitance of C2 through the ADC-IN voltage. The unknown part is a driver which ...
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1answer
40 views

LVDT Measurement question

Is there any reason one might want to measure both the primary and secondary coils on an LVDT? I assume the primary coil excitation voltage would be constant, but I see circuits around that measure ...
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Sensitivity of half and quarter wheatstone bridge

Could anyone help me determining the different relation for sensitivity of wheatstone half-bridge and quarter-bridge using transfer function? How differently varies the sensitivity between diverse ...
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1answer
15 views

Will multiplexing impedance measurements from the AD5933 act as a series resisitance?

Image of block diagram of the AD5933 at: https://www.researchgate.net/profile/Douglas_Dutra/publication/292976112/figure/fig1/AS:520210098917376@1501039160818/AD5933-Functional-Block-Diagram-10.png I ...
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1answer
57 views

RLC equivalent model and Impedance Smith Chart

I have done some impedance measurements on an unknown 1 port device. I have measured its impedance at different frequencies (from 10 MHz to 600 MHz) and I have seen it on the normalized (on 50 Ohm) ...
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Low Pass Step and Low Pass Pulse sith Vextor Network Analyzer

I have an extremely basic question about time domain measurements with Vector Analyzer. It is something that is not explained in simple words in all datasheets/guides (maybe they think it is obvious ...
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196 views

Measuring transient thermal impedance

Context: output stage of Class-AB audio power amplifier. In the example schematic above, the output stage is biased in Class-AB via a bias voltage source. In use, output transistors will heat up ...
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1answer
151 views

Impulse response function single coil

How can I measure the impulse response function of a single coil - like an electromagnetic shaker? The construction of a second winding would be difficult. I was thinking about a T/R switch but there ...
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3answers
51 views

how can I calculate the smallest measurable voltage for a given adc?

I have a project where I use 4 strain gauges in full bridge configuration with a hx711 module and an Arduino mini pro. How can I estimate the smallest voltage I can measure with a given adc from its ...
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89 views

Current Flow indicator using LED

I want to build a simple measurement circuit for indicating the load on a little 12V pump. Assuming that the pump draws 200 to 2000mA depending on the load, how can I connect lets say 5 Red LEDs so ...
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39 views

Three Phase Voltage Measurement

I have matrix rectifier.However, I want to measurement phase voltage by ADC during not rectifying matrix rectifier? Can I measurement phase voltage with passive rectifier?
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2answers
43 views

Agilent 4294A Impedance Analyzer: “Bridge Unbalanced” during calibration

I am having problems calibrating my test fixture for the Agilent 4294A Impedance Analyzer. The open measurement always works, but with the short measurement I always get the error message "Bridge ...
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3answers
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Understanding capacitance in oscilloscope probe tip

I am trying to understand the capacitance and resistance in oscilloscope probe tip. In the above attached image, that 9Mohm resistance is used for that 1x and 10x setting that divides the input ...
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1answer
36 views

Testing QSPI Setup time and Hold time

I am having a QSPI Interface (operated in SDR mode) from this QSPI chip to MCU chip. QSPI lines : QSPI CLK QSPI CS QSPI_IO0 QSPI_IO1 QSPI_IO2 QSPI_1O3 VSS VDD I am trying to validate the QSPI Setup ...
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1answer
60 views

FFT in oscilloscope measuring Frequency spectrum

I am using a Keysight InfiniiVision MSOX3054T Scope having Bandwidth of 500MHz and Sampling rate of 5Gsa/s. I am learning to use the FFT Option in the scope. Below is the waveform I captured of my ...
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100 views

Connecting ADC ground to alive part of a power supply board for measurement

Before start, this is going to be a long question. My apologies in advance! At my company, we are trying to design an automated engineering validation test (Auto EVT) tool for power supply board (...
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7k views

Why only sine waves?

I have already read a few EE texts where a sine wave is often seen. Why is the sine wave often used as a test function for a circuit or a system? Why don't we use any other signal instead of sine? ...
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103 views

Digital multimeter

When we measure an electrical quantity on Digital multimeter (DMM) like current, if we dont get readings of small range scale we switch the range utill we get our reading, same goes for voltage. But ...
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115 views

Is there a cheap and accurate electromechanical method to provide a configurable counter-torque?

Given a continuously rotating motor shaft, is there a cheap and accurate electromechanical method that would provide a configurable counter-torque? Rotation is in one direction only, RPM range is 0 - ...
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1answer
30 views

Signal to Noise Ratio and Inflection point (PSRR measurement in Oscilloscopes)

I have a 3.3V LDO for which I am supposed to do the PSRR measurement. I have a keysight scope to do this. While looking at this PSRR YouTube tutorial from Keysight, I have a few doubts. Around 5:...
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70 views

Length to make magnetic loop antenna/probe for 1.6GHz?

I'm making a near-field probe to to search for GNSS (GLONASS) blocking signals on my PCB. According to http://www.eryptick.net/unisold/loop.html the wire length for a loop should be 1/3 the ...
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37 views

Frequency Sweep

I have heard the term "Frequency sweep" in testing context. I want to understand, when we say frequency sweep, we give a start frequency and a stop frequency. Assume a function generator with a ...
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1answer
57 views

Control Loop Stability of DC-DC Converters

I am performing a control loop stability test on my 5V DC-DC Buck Converter with the help of this Keysight App Note I understand that we are injecting a noise signal on the feedback network of this ...
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69 views

How do I calculate the capacity of a capacitor using measurements of an experiment?

I build this circuit in an experiment During the experiment I got these readings: ...
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2answers
162 views

Vector Analyzer: what is IF bandwidth?

I noticed that if I set IF bandwidth low, the measures done with a vector analyzer are better (with higher SNR) but it is slower. Precisely, what does it happen when I change it? Can you explain me ...
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30 views

Effect of the horizontal magnifier control on the sweep speed, sweep time and number of cycles observed?

What is the effect of the horizontal magnifier control on the sweep speed, sweep time and number of cycles observed? Sweep speed increases by ten times for a 10X magnifier, sweep time reduces by the ...
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1answer
1k views

Why are circuit results different from theorised?

From the following circuit: I got the following results in comparison to my theorized calculations: Why were my result different to my calculations? Here is my calculations: Equipment used: ...
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2answers
40 views

Use single-pole voltage detector to check for currentflow on a lamp

I am using a single-pole voltage detector to detect if there is a current-flow / potential on the clamps of my ceiling lamp (See device in first picture below). When the ceiling-lamp is ON and ...
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41 views

Voltage Measurement through Spectrum Analyzer

I have done some measurements with a Spectrum Analyzer of a square wave of 100kHz and amplitude equal to 1V. The resulting power spectral density is here shown: The highest peaks represent the odd ...
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25 views

Can anyone explain dynamic gain measurement (2 tone test) to check for the memory effects in the system?

I have read in a lot of research papers concerning RF-Power Amplifiers that they tend to have memory effects. It means that the current PA output depends on the memory of the PA along with the input. ...
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35 views

Low power rectification of AC component of modulated current signal

I have a current source consisting of a 100Hz sine plus a DC offset: \$I=I_{DC}+I_{AC}\cdot\sin(2\cdot\pi\cdot 100Hz\cdot t)\$ with \$ I_{DC}\approx100uA\$ and \$I_{AC}\approx 1uA\$. I would like to ...
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55 views

Tektronix TDS3000 series max trigger rate

So I am making a testing stand for some equipment and I am using an old TDS3034C Tektronix scope for most of my measuring purposes. I've connected it to the computer via Ethernet and using PyVisa to ...
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1answer
60 views

Why footprint dimensions are to edges and not centers

Whenever I'm looking at electronic components, I regularly see footprints with this kind of thing: Dimension E seems to me to be somewhat unhelpful; rather than simply reading the centre distance (...
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1answer
385 views

ICL7107 not working on breadboard?

I am building a very simple thermometer circuit on breadboard, based around the ICL7107. The 7-segment LED display I am using is made up of 3x TOD5261BE-N displays. My intention was to make ...
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Get position along electric wire [closed]

Do you know the game called Buzzwire where the aim is to guide the grip mounted loop through the wire maze without touching the loop against the metal maze all the way to the end? is it possible to ...
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305 views

Measuring the activation time of a solenoid

I'm trying to measure the activation time of a pull-type solenoid. When the solenoid doesn't have a load connected to it, you can measure its activation time through the current it consumes. At first,...
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1answer
73 views

Differential Probe measurement and Single Ended probe measurement (Using MATH function in scope)

I am measuring the differential voltage across a resistor connected between the supply (16.5V) and the ground. Below is my Circuit. Using differential probe (Probe setting 9.96:1), when I measure, I ...
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3answers
70 views

Test grounding of wall sockets

I just had (and solved thanks SE) a problem with a wall socket where the ground contacts were malfunctional. Much of the electrical safety relies on proper grounding. As far as I can read, details for ...
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74 views

How dual gyroscopes can be used to remove gyro drift?

I need to measure yaw/heading/azimuth correctly. Now, I have done with gyro with very strong filtering and the results are very low yaw drift and even when there is perfect calibration then there is ...
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How do I measure the fluctuation of a pulsed voltage of ~1700V?

The problem: See the little sketch. Starting from a high-precision DC power supply, I pass the voltage to low-pass filter and a pulser. This pulser pulses the nominal voltage of around ~1700V down to ...
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42 views

Requirements for measuring PCIe 2.5GT eye diagram

What is suitable equipment for measuring an eye diagram of PCIe differential pairs. I would like to evaluate the signal integrity of a PCI lane RX/TX/CLK 2.5GT. What is the recommended minimum ...

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