Questions tagged [time]

Time cannot be created, but it can be measured by using common references. The oscillation of the cesium atom, or a pulsar, can be used in our lifespan, but neither one is steady forever. We can create 'instances' of time with tuning forks and electronic oscillators. By creating them we define them in terms of 'increments' of time. Those deemed to be laboratory grade become our reference devices for measuring time and frequency, the reciprocal of time.

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19 views

Why is it important to measure for autocorrelation in DSP?

Why is it important to measure for autocorrelation in DSP? Why do we want the value of autocorreleation to be zero?
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Why do car blinkers seem to synchronize and then diverse from each other?

When I am on the road, the blinkers of other cars seem to sync together for a few clicks and then they diverse again. Is this just me seeing it wrong - so on fact they never sync - or is there some ...
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119 views

Time synchronization of circuits in different places

How can i synchronize times of circuits placed quite far(a few hundreds of meters) from each other? I thought of using PPS signal from GPS receivers, but I'm not sure about this point: Are these PPS ...
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149 views

Detecting pulses of one nanosecond length

As the title suggests, I want to detect extremely weak (~20mV) and short pulses: between 900ps and 1,5ns in length. I do not really care about the readout time or hold time after a pulse is detected. ...
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48 views

Is there a way to convert a time delay into a sample delay?

I have been given a time delay of a signal and the sampling frequency, however, I am trying to calculate the delay in samples. My logic is: delay frequency divided by sampling frequency, however, this ...
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31 views

Timing Diagram - HyperBus - HyperFlash - HyperRAM - RWDS - CLK - DQ

I'm trying to design an interface between an application processor and a HyperFlash memory from Cypress. Therefore, I'm trying to understand the timing diagram for RWDS and DQs relative to the CLK ...
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65 views

Compute the total time required to take a photo

I'm in the computer sciences engineering field. For a project, I need to use a camera, take a photo, process it and take a decision and so on. It's a hard real time problem as we have timing ...
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121 views

Carry-select adder - Time calculation

a) Suppose a binary pick-up adder (carry-select) of 32-bits, comprising 4 sub-sections adders spreading carry of range 8 bits. Show the values ​​obtained internally in the circuit of this adder to ...
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Memristor LTspice simulation not matching MATLAB or Python

I have been attempting to port a modified version of the Yakopcic memristor from Python/MATLAB to LTspice but have been running into issues with the results not being the same, as shown in the ...
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87 views

Viewing 100-200ns pulse on oscillocope

I've recently bought a Gould OS300 twin-beam 20MHz oscilloscope. I'm trying to view a 100ns to 200ns pulse, but I'm not sure I'm using the correct settings. The pulse voltage goes from 3.80V to 0V so ...
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50 views

What does hₖ[n] mean here?

Is the impulse response different from the output y[n]? Is the input x[n] all the delta function at different values of n? From Signals and Systems by Robert Oppenheim, Linear Time Invariant systems
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Is this the best way to make a timer auto-off feature for a CPU fan?

This circuit is outside of a PC simulate this circuit – Schematic created using CircuitLab I want to make a fan that shuts off after a preset time depending on the capacitor value. The button ...
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266 views

How are system clock and oscillator frequency related?

My question is given a, for example, a quartz oscillator on a MCU board, how is the system clock generated? I'll break down this question into several parts below: I always have the impression that ...
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84 views

Reliability of Sampling Rate vs Absolute Timestamps

I am building a system with multiple sensors and I want to sample the different sensors at different rates. For the sake of an example, I am using two MAX30102EFD-T sensors. One of the sensors I want ...
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53 views

Inductors voltage substitution from 2 independent equations

We have this circuit: simulate this circuit – Schematic created using CircuitLab The current through the inductor IL = Io(1-e^(-R*t/L)(1): Now there is an equation VL = -L*dI/dt(2) my question ...
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What is the uncertainty of the Analog Discovery oscilloscope?

I'm an electrical engineering student and I have to measure the Slew Rate of an opamp (and most importantly its uncertainty). I created a simple voltage follower circuit and I'm using the Analog ...
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73 views

State Space Clock Model & Control

I was hoping to get some help understanding a state space model that I have found in time and frequency literature. The literature pertains to a discrete-time model of a steered clock. A phase ...
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357 views

How does the 4th satellite in GPS know the time offset?

Going through the working of GPS technology, I came to know that at least 4 satellites must be visible to solve for the location with considerable accuracy. Going through most of the resources, I can ...
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What is a "discrete time controller"?

I'm reading a paper, and the first sentence is: Most dynamic systems are controlled by discrete time controllers What is a discrete time controller ? Thanks
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564 views

How to use a CSV file from an oscilloscope for further analysis

I saved and opened this data from my oscilloscope: How to plot the real scale waveform data? Do I have to multiply it with vertical scale? And what about the time? What to do if I want to plot the ...
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Best way to run current for certain amount of time

I have a circuit set up that requires around 5 Amps of current to run but I need it to only run for a specific amount of time. The circuit is activated when I press a button and I want some tool to ...
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183 views

DIY reference clock jitter / Allan deviation measurement

I am considering doing some recreational timing. I have few OCXO's, GPSDO, Rb source - but no way to compare their stability / jitter. Majority of sources are around 10Mhz. Is there any DIY-friendly ...
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59 views

How to sync time between two devices (<30m apart) with a sub milisecond accuracy? (think PTP)

So my task is to detect the source of banging in a metal tube (picture radiator pipe). The idea is to put two mics to the ends of the tube and measure time differences when they hear banging. The tube ...
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72 views

Fourier Transform Time Scaling Property using f (frequency) or w (omega - angular frequency)

The time scaling property for a fourier transform is as follows: My book shows this property in terms of \$f\$; however, my instructor likes to use \$\omega\$. I have also seen this property written ...
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A problem with designing a time register

I'm on a project where I need to design a time difference register. In a time register the time information is first converted to voltage, which is stored in a capacitor. Later, when we want the ...
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114 views

Wireless Time Synchronization Project

I am part of a team project involving baseball where we would like to determine whether a runner stepped his foot on the base (first base, for example) before or after a fielder (the first baseman) ...
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86 views

Inductor Voltage and Current After Switches Open and Close

I was given this problem where switch s1 and s2 are opening and closing at different times. I have already solved for the voltages and currents, but now I need to plot vL and iL at each time. My ...
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Why is Δt constant in phase shift measurement?

I would like to ask for some help with phase shift plotting. To be precise, with time delay between two waveforms. I am measuring two currents using an oscilloscope. channel A (blue) is my current ...
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73 views

The constant time value for an electronic device [closed]

i am working in a data science project that require certain information about electronic devices. So I know that for each electrical circuit there is a permanent regime and a transient regime and ...
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55 views

Time interval quantized?

We have a capacitor fully charged with some voltage. At t=0 we can find the current. This current will change the voltage of the capacitor. However the information of the change of the voltage of the ...
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47 views

time axis confusion in signals and systems

I am learning signals and systems and we are given a impulse response swhich is discrete and from -5 to +5 on X axis. I do not really understand that it has a negative part as everything starts from 0 ...
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44 views

Calculate time energy is stored in capacitor

I have this problem: I've calculated A) to be 8 nJ, and my Vc(0) = 4 V and Vc(∞) = 0 V. I tried using the wc(t) = 1/2CVc^2 formula to calculate the time when the energy of the capacitor is 1 nJ. ...
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How to discretize value like EDF ( or other electricity companie )

I make a solution using some automate like : A9MEM2050 ( Shneider ) ( and more advanced, so i have a lot a different value , that include rpm, psi, armonic, etc ...) Every automate send a value every ...
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timestamp generator register location on Cortex-M4 (PSELCTRL CNTCR)

I am trying to find the location of the register where the timestamp generator can be enabled on a Cortex-M4 processor. In the CoreSight SoC Technical Reference Manual on page 3-210 it is mentioned ...
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227 views

Calculate power on time of a buzzer

I would like to use a 5v active piezo buzzer to beep for a second or two. When the relay is on NO the capacitor will charge from the dc source and when the relay is on NC the capacitor will discharge ...
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137 views

Are consumer systems able to measure nanosecond timings?

Following the theft of my brother's car (a modern Audi Q-something), I got interested in how contemporary cars are protected. The authentication of the key to the car is dreadful (I work in ...
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417 views

PPS Timer on STM32

The MCU used is a STM32F042 which is clocked by an OCXO oscillator (Abracon 10 MHz - 20 ppb). The subject of this thread is to get the best accuracy on one PPS Timer. For my application, I need to ...
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45 views

Time Domain Analysis with Vector Network Analyzer

I have done some measurements with a VNA in time domain (by using the transform operation of the instrument). Precisely, I have selected the measurement of S11 (reflection coefficient at port 1 of the ...
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73 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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885 views

Is charge batteries in series faster than in parallel?

I would like to know if charging 7 lithium-ion batteries in series with BMS 7S are faster than simply charge them in parallel. Please for your advice, thank you!
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How to generate time delay when input frequency is high?

Im trying to generate time delay for my gate drivers for a project im working on. But the issue is at lower frequencies my circuit works fine, as I ramp up the frequency (upto 250Khz) the output goes ...
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Current when switching on with inductance. Role of Reactance?

When switching on the current through a coil it can be described as: \$ I(t) = \frac{U}{R} \cdot (1 - e^{(-x\cdot R/L)}) \$ For a sinusiodal current the complex resistance for a circuit with ...
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NTP Time calculating

I have this code and i use in my device. ...
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564 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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101 views

Output Capacitor Voltage Holding time during dropout

I have a buck converter. Vin = 12V Vout = 5V Iload = 0.5A I have one dropout requirement. ...
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Calculation on gate charging [duplicate]

I would like to calculate the response time of the PMOS cicruit in this ciruit. But I have some troubles about the gate charging. I'm trying to use this: https://www.vishay.com/docs/73217/an608a.pdf ...
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533 views

How to calulate mosfet response time with load?

I would like to calculate the response time of a PMOS circuit and of the circuit Could you tell me how to do it? I'm using this transitor. https://www.infineon.com/dgdl/Infineon-IRFR6215-DS-v01_02-...
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Real time spectrum analyzer and Fourier Transform

I am studying spectrum analyzers and a doubt came to me about real time spectrum analyzers. Suppose you have a signal in the time domain: in order to calculate the Fourier Transform, you need to know ...
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Does the profile of phase-noise power spectrum density (PSD) vary with time?

I will promptly provide any detail or revise my question aimed at any feedback. Does the profile of phase-noise power spectrum density (PSD) vary with time? The conclusion may be that it won’t ...
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779 views

RTC DS3231 get reset

The RTC module ZS-042 get suddenly reset and show default values (2000/0/0) with no possibility to change it no matter what. The reset can occur after uploading a new sketch (I'm using ESP32) or while ...