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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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How do digital watches steadily increment the internally stored time without fluctuations in speed while running other logic at the same time? [closed]

I'm not 100% sure if the right place to ask this is StackOverflow, Software Engineering, or here, but I'm going to guess here since this is related to hardware. I was looking at my digital watch and ...
I Like Python's user avatar
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Why do we add the positive clock skew to the minimum clock period?

Given the following circuit: I was told that the minimum clock period would be the sum of the setup time plus the propagation delay plus the clock skew for a positive clock skew. I was wondering as ...
EskimoJones's user avatar
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How to determine the values of transportation delay blocks and step block in block diagram?

What are the values of transportation delay blocks and step block in this block diagram to get Motor speed Graph for KI = 1.0s−1, KP = 0.3 and time delay = 0.046?
koka_123's user avatar
1 vote
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Impedance for an equivalent circuit

In: Richard Reidl, N.O. Sokal & Laszlo Balogh (1990). A Novel Soft-Switching Full-Bridge DC/DC Converter: Analysis, Design Considerations, and Experimental Results at 1.5 kW, 100 kHz. IEEE ...
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How to properly calculate the run time of a battery using a power converter?

I want to buy a 12v 100ah lithium battery to power a 750 watts power converter that provides 120V. I would like to know how many hours of energy will I have with this information. I tried some online ...
Roberto de Nobrega's user avatar
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4 answers
60 views

Does reciprocity apply in appliances power consumption?

Normally, microwave ovens have a timer and a power selector. Similarly in other machines, you can control the power and the time you use that power. Is it generally true in real life that the final ...
terauser's user avatar
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1 answer
133 views

Time function for an equivalent circuit

In the IEEE magazine 6. NO. 3. JULY 1991 A Novel Soft-Switching Full-Bridge DC/DC Converter: Analysis, Design Considerations, and Experimental Results at 1.5 kW, 1OOkHz the following converter has ...
i33SoDA's user avatar
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Contactless measurement of internal time base

I'm currently trying to measure the internal time base of stopwatch (both mechanical and digital) to ascertain the expected accuracy of the device. I have looked through many articles related to the ...
User988812119's user avatar
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2 answers
68 views

Delay logic of an optical sensor

I have a simple optical sensor that has 3 pins: Power (5V), Signal (5V when not triggered), and Ground. When the sensor is triggered, the signal goes to 0 V. I need to constantly delay the signal by a ...
Pyper's user avatar
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1 answer
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Two 14S Lithium-Ion batteries have different charging speeds: the smallest is slower than the higher capacity one

Long story short: I built one 14S battery last year, using Molicell P42A cells. 6 cells in parallel for every series. So, around 58.8V total voltage on the battery. Recently I made another battery ...
justanaverageuser's user avatar
3 votes
4 answers
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Can I use capacitor to measure time?

I want to measure distance by electromagnetic wave travel time. Capacitor charging voltage on time dependency is well-known: \$V_{capacitor} = V_{source}(1-e^{\dfrac{-t}{RC}}) \$ Equation above is ...
Stdugnd4ikbd's user avatar
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2 answers
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What is the charge time of a capacitor C that is already at Vc volts, and I want to charge it to V volts? Vs = 5V the supply voltage

In code, I've been using this formula: charge time t = -ln(1 - Vc/Vs) * R * C where R = 1.0 here so we can ignore it. This is derived using Kirchoff's laws etc from a voltage source attached directly ...
SeekingAMathGeekGirlfriend's user avatar
1 vote
1 answer
109 views

Determine derivative time of real PID controller

I need help determining the derivative time of a real PID controller. Above me is an ideal PID controller. In my case I have another resistor (let us say R0) before R1 and Cd serial. How do I now get ...
helphelphelppp's user avatar
2 votes
0 answers
103 views

Best way to close GPSDO PLL digital loop?

I am trying to build a GPSDO with a holdover capability of 500us/24hs (maximum drift accumulated). The system uses a 10MHz OCXO and it is my intention to use a microcontroller (ATMega, STM or ...
Fernando Hernandez Ruiz's user avatar
14 votes
2 answers
2k views

What does the "proportional symbol" (∝) mean when used as a time unit prefix?

In several datasheets for electronic components, I have seen a ∝ symbol used as a prefix for a time unit, usually seconds, writing as ∝s. As far as I know ∝ is not a valid SI prefix, so what does it ...
Pep's user avatar
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Is a 1 Hz signal the same as 1 PPS one?

Is a 1 Hz signal output from a ripple counter or divider the same as a formal "1 PPS" signal? If no, what is the difference in the time domain?
Ken90's user avatar
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I need a simple circuit to provide about a 2.5 second power-on delay to a 5 volt mini relay 6 volt DC supply using a RC/Zener to 2222 base lead

I've tried various circuits with the result that the 2222 transistor fires up the relay instantly ... The relay coil is 46 ohms I'm using 4 AA cells for 6volt DC supply, a rectifier diode to control ...
The Barrel7's user avatar
3 votes
1 answer
195 views

Crystal resonator characterization in frequency and time domain

I want to measure a 32.768 kHz crystal resonator (not oscillator) in the frequency and the time domain using a ZURICH HF2LI instrument, which is a network analyzer and oscilloscope in one unit. The ...
Jack Huang's user avatar
2 votes
2 answers
766 views

Adjusting the rise and fall time of a gate driver

I have a hard time understanding the specifications of the UCC27511A-Q1 gate driver. I understand that for a period of 0.5 μs (2 MHz) it can supply a source current of 4 A and a sink current of 8 A. ...
i33SoDA's user avatar
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3 answers
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Calculating battery run time

How long will a 12 V, 35 Ah battery powering a 5 V, 1 A device last? Yes, there is a 12-5 V converter in this circuit. Is the correct method for finding the solution to convert both sources to watts ...
SChand's user avatar
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0 answers
132 views

Difference between Internal and External RTC [duplicate]

what is the difference between internal and external RTC ?
happy's user avatar
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Calculating the current through a time-varying RLC series resonant circuit

As shown in the circuit below, an admittance \$Y\$ consists of a series resonant circuit \$Y_m\$ and an additional capacitance \$C_0\$ in parallel. \$Y\$ is given by \$Y = j \omega C_0 + Y_m = j \...
Charly's user avatar
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1 answer
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Analog-to-digital conversion time on MSP430FR6989

Where can I get or calculate the time it takes for the analog-to-digital conversion? I'm using a MSP430FR6968. I've looked in the datasheets but couldn't find it anywhere.
Toothbrushing Intensifies's user avatar
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1 answer
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RTC counter wrap mode

In the synopsis of the datasheet for RTC we have one feature i.e. counter wrap mode My understanding for this feature: RTC is 32-bit, i.e. \$\ 2^{32} = 4295947296\ \$ seconds counter will increment ...
Sukanya U's user avatar
1 vote
2 answers
155 views

DS1683 oscillator accuracy?

I'm working on a project that includes a DS1683 elapsed-time and event recorder chip. This chip has an internal oscillator that allows it to measure elapsed time, but I can't find any description in ...
Dave Tweed's user avatar
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5 votes
3 answers
693 views

Trapezoidal approximation of inductor current from moment to moment

I'm working on a circuit simulation program. I've gotten passive circuits to work, even ones that have capacitors and inductors, but the simulation has to have a very small timestep when inductors are ...
ee_student's user avatar
2 votes
1 answer
151 views

Why is the time lagging behind on the Renesas ISL1208 real time clock (RTC) in battery mode?

For a project I am using the ST M41T81 RTC but because of the parts shortage, I updated the firmware to support both the M41T81 and LS1208 RTC chips. The reason I am using the LS1208 is because the ...
ChassakAPT's user avatar
0 votes
1 answer
1k views

Mathematical difference between FFT and STFT

Can a FFT be recreated by performing STFT on the smaller time intervals and then summing them up. My doubt is that FFT is a usually a amplitude vs frequency data and STFT has a x-axis in units of time....
avi0105's user avatar
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1 answer
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Method for calculating time different between two acoustic signals using analog electonics [closed]

Think If we place two sensors at different places and record acoustic signal coming form certain direction. So, I want to find a method to calculate the time difference which two sensors detect the ...
Supun Chamara's user avatar
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1 answer
340 views

What does it mean to have a settling time at 5% of final value?

I need to make my control system to have a tolerance of 5% in less than 0.5 seconds (settling time ts = 0.5s at 5%). My question is: does 5% mean the error band can be between these values in red (...
StrainGauge1Fan's user avatar
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2 answers
1k views

Do I need RTC while I'm using NTP?

We know computer and another device like microcontroller is not accurate in ticking clock comparing to wall clock that using cesium atom. I heard RTC module is purpose to making accurate the ticking. ...
Muhammad Ikhwan Perwira's user avatar
1 vote
2 answers
620 views

Equation for total charge time of a capacitor in a half wave rectifier circuit

simulate this circuit – Schematic created using CircuitLab For the above circuit I want to know if there is a formula that can give me the capacitor voltage as a function of time. I'm not ...
GNY's user avatar
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1 answer
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Why don't the GPS equations account for receiver clock drift?

My basic understanding of GPS is that a network of at least four synchronized satellites send messages containing their locations and transmit times (\$A_i, B_i, C_i\$ and \$t_i\$) to an ...
david11's user avatar
4 votes
2 answers
168 views

Time domain reflectometry and resolution

Regarding the temporal (and consequently spatial) resolution of a TDR system, I've read from different sources that the maximum resolution achievable is half of the rising time of the input step ...
Anice41's user avatar
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1 vote
2 answers
256 views

Capacitor and loading effects

If there is a power supply charging a capacitor (e.g. 4 μF) through a resistor (3.2 MΩ), the time constant can be calculated with the capacitance and resistance. If I, however, measured the voltage ...
C.anight Jun's user avatar
-2 votes
3 answers
981 views

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 ...
Asmodean's user avatar
1 vote
3 answers
418 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 ...
berker's user avatar
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0 answers
199 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. ...
user3141592's user avatar
0 votes
1 answer
707 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 ...
Sputn1k's user avatar
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0 answers
248 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 ...
Berkaj's user avatar
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0 votes
1 answer
68 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 ...
Ripitchip's user avatar
1 vote
0 answers
333 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 ...
Mary Star's user avatar
2 votes
2 answers
457 views

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 ...
Thomas Tiotto's user avatar
1 vote
3 answers
197 views

Viewing 100-200ns pulse on oscillocope

I've recently bought a Gould OS300 dual trace 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 ...
38150_piled's user avatar
0 votes
2 answers
137 views

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 ...
user avatar
1 vote
3 answers
974 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 ...
jleng's user avatar
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1 vote
1 answer
168 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 ...
Suever's user avatar
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-1 votes
2 answers
229 views

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 ...
John Bardeen's user avatar
3 votes
1 answer
140 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 ...
mica's user avatar
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1 vote
3 answers
2k 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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