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Questions tagged [phase]

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3 phase motor change from 440 V to 220 V with diagram question 2.0 [duplicate]

Last post was deleted for some reason. Thank you for those who took the time to responded to it. I greatly appreciate the help on this. Jist of the 1st post was( I bought a sander wired at 440. I ...
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95 views

3 phase motor change from 440 V to 220 V with diagram question

Some confusion the way my new machine is wired. I bought a sander not hooked up and the guy thought it was wired at 440. I need to set it to 220. The motor says 220/440. I have 220 at my shop with ...
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35 views

Understanding Hilbert Tranform in SSB modulation for AM

I am studying about Hilbert Tranform in SSB modulation for AM When I read about matlab docs on hilbert transform , why "a signal's negative frequencies are phase-advanced by 90 degrees and the ...
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3answers
52 views

The distribution of phase angle between identical zero mean Gaussian random signals?

I am trying to solve the 2013 paper set by ISRO for electrical engineers. I was hoping to get some clues on how to approach this problem - No 22. random signals which have gaussian distributions will ...
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38 views

phase shift oscillator circuit

I'm planning to construct a phase shift oscillator circuit. I simulated it using multisim and i got the sine wave with values I wanned (you can check the pic). then i assembled the circuit on a ...
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2answers
108 views

Fitting of continuous transfer function

I measure a network's transfer function using a network analyzer and therefore have a set of complex data points, representing the network's gain and phase. I wish to fit a continuous, rational ...
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1answer
34 views

Generating square wave using NXP LPC1768?

I am reading a book that teaches about programming the LPC1768. I have the following exercise here: Using any digital output pin, write a program which outputs a square wave, by switching the output ...
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1answer
89 views

Odd voltage readings between phase-ground, phase-neutral, neutral-ground

Recently i tried gathering voltages from few AC outlets in my house. I got following readings using a dmm Phase-Ground = 398V-400V (should be around 240V) Phase-Neutral = 230 V Neutral-Ground= 210 V ...
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2answers
90 views

Circuit To Measure Phase difference

Is there any classical analog circuit to measure the phase difference between two analog signals ( especially sinusoidal signals )? I want to measure the phase difference between two sinusoid signals ...
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2answers
130 views

Run 1800 RPM motor at 3600 RPM

I have a 2”x72” belt grinder with a Brook Crompton bf4n.75-2 motor. It is connected to a Teco L510 VFD. Running here in the United States on 110v. My question is about turning up the RPMs sometimes ...
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1answer
47 views

Link between phase noise and linewidth for a oscillator?

I was googling for a formula to transform the dbc/Hz value given in data sheets for VNA, spectrum analyzers and VCO is often given in dBc/Hz with offset. Now looking up research papers about future ...
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2answers
64 views

Philicorda phase shifter vibrato circuit doesnt work

I have built this circuit in the online editor, but it doesn't seem to oscillate. My philicorda vibrato broke down and i want to repair it. It should convert 21V DC into a sine wave when i understand ...
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153 views

Calculate Angle for Triac Phase Control

Triac-based phase control of the mains power into resistive load. According to this post, https://www.physicsforums.com/threads/how-to-calculate-rms-voltage-from-triac-phase-angle.572668/#post-...
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49 views

Pulse skip modulation vs Phase cutting for AC inductive loads?

What is preferred and safe mode for controlling power to an Inductive AC load when driven by a Triac? I am using a microcontroller with zero crossing optocoupler to drive the control signal and the ...
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1answer
83 views

What is phase ripple and how is it measured?

Whilst reading up on phase response, I came across a reference to "phase ripple". Specifically, I was reading this article by Keysight, on phase measurements. From my understanding of the article, ...
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51 views

In a three phase choke, is the rated current per phase or for all 3 together?

In a 3-phase choke, for example here: https://katalog.we-online.de/pbs/datasheet/744839010400.pdf What is the current rating? For the inductance it says 3x10.5mH, so its 10.5mH in each phase and if I ...
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1answer
44 views

During the positive cycle of US AC MAINS Electricity is the secondary Voltage back EMF or in phase with the AC MAINS?

The Sine wave of AC Mains in the US starts at zero and increases to Vmax~169-Volts. in the beginning magnetic Flux Change is greatest as it is proportional to the slope of the AC Sine wave (which is ...
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1answer
319 views

What does actually the “unravel branch wrap” option do to the phase plot in LTspice?

Below two Bode plots are identical just that in the second one the option "unravel branch wrap" is unticked for the phase plot: What does this option do to the phase plot?
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1answer
28 views

How is Phase Shift of an Op-Amp calculated using Polar Coordinates

I have a textbook (Op-Amp: Characteristics & Applications by Robert G. Irvine, 1981) and its Frequency response chapter started by discussing the Internal LP filters between the Input Differential ...
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1answer
69 views

high side mosfet offset voltage in Phase shifted full bridge converter

I am working on phase shifted full bridge converter. The input voltage of it is 300 V. The issue is I am able to see offset voltage (shown in fig below) in the gate to source pulses during turn-off ...
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2answers
53 views

Matlab Three Phase System Model

I have a question regarding MATLAB Simulink if anyone is familiar with the software. I usually have no problems creating basic models like this one below: I know the image is rather small. It is ...
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21 views

Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
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2answers
176 views

Bode Phase Plot of RC High-Pass Filter

I have been trying to understand Bode Phase Plot of RC High pass filter. I know that from my engineering that voltage lags behind the current passing through the ...
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1answer
68 views

Is there an analog circuit or filter that can produce constant phase shift over a specific bandwidth?

I need to match the phase of two signals coming from a pair of transducers over the 10Hz to 4 KHz range, the difference between the two transducers is really close, however one of the transducer lags ...
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1answer
54 views

what would be the function of a resistor 36,000 ohms across leads on non polarized electrolytic capacitors in a roto phase phase converter

I have a surface grinder (3 phase) and believe that some of the capacitors are shot in my phase converter due to a lack of available surge power. The grinder starts and works ok but the circuit board ...
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74 views

Impedance magnitude and phase error - Mathematical formula

Today I read a paper on which there are the terms magnitude error and phase error relative to a comparison between measurements performed with a biosensor and with a benchtop electrochemical impedance ...
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0answers
64 views

Physical significance of positive group delay with negative phase delay

This question is an addendum to: Is group delay the same as the delay of a certain frequency? Lately, I've been going back to basics to better understand the concepts of group and phase delay, so I ...
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2answers
161 views

PA92 OPAMP phase compensation

I'm having trouble to understand the phase compensation on the PA92 opamp. First I'll explain quickly the circuit I'm building.   1.  The circuit I'm using a 200V battery and would like ...
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2answers
172 views

Is group delay the same as the delay of a certain frequency?

I know that group delay is the delay of the envelope, or the derivative of the phase with respect to \$\omega\$. What I want to know is what exactly happens in the time domain. For instance take the ...
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2answers
176 views

noobie question on 3 phase [closed]

i am renovating a house and the electrician has installed all new wiring ,circuit switches, outlets etc... so now the electric company has asked if i want 1 or 3 phase. I told them 3 phase and ...
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0answers
24 views

How can a common phase error cause a linear phase drift?

I have a set of channel measurements, a set of raw data and processing files, which perform the synchronizations and also remove the common phase error. The effect i observed, when i removed the ...
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1answer
104 views

IEEE 1588 PTP phase and time synchronization

Why everywhere is said that PTP synchronize phase and time together? phase and time are totally separate concepts. does it mean after using PTP rising edge of slave and master clocks happen ...
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2answers
70 views

Understanding Working of High-Pass RC Filter

I was trying to visualize what happens when frequency is swept from 1Hz to 1GHz. In case of capacitor, voltage lags behind current by 90 degree and capacitor reactance depends upon it's frequency. I ...
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2answers
255 views

Calculating Phase/Time Delay induced by a 2-pole Bandpass filter? ie. Group Delay?

If you have a two-pole Butterworth bandpass filter described by a particular Q value (Q>0.5) and a resonant center frequency "f", is there any equation that will tell you the phase/time delay induced ...
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297 views

Why are so many wires coming out from a 3-phase transformer?

I want to make an arc welder from this stripped transformer. As far as I know it is a 3 phase transformer that could transform 380V to 12,24,40. I know how a regular 2 coil transformer works, but I ...
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2answers
98 views

Power to the home in the UK

We have a question about the power available to the home in the UK. Our product draws a fair amount of current, so we have (so far) designed it to be powered by ~230vac single phase at 48A OR ~230vac ...
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38 views

Phase modulation and intermodulation anomaly **plots attached**

I have a MATLAB script for modelling a two tone signal (a sum of two sinusoids) going through a non linear transfer function (such as an amplifier). The amplitude of a signal is amplified non linearly,...
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152 views

Trying to obtain phase angle using AD 8302 phase detector chip

I am trying to use the AD 8302 phase detector chip to obtain phase angle between antenna's receiving a RF signal due to the vertical separation of the antennas. I want to use the phase angle to ...
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3answers
133 views

Phase Difference Between Two Signals (Problem)

I am asked to calculate the phase difference between the two signals below. $$i_1 = -4\sin(377t + 55^\circ) \hspace{0.2cm}\quad \mathrm{and}\quad \hspace{0.2cm} i_2 = 5\cos(377t - 65^\circ)$$ What I ...
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1answer
246 views

Linear and non linear phase FIR filter

I am a confused about linear and non linear fir filter. I have this depiction of the solution space for linear-phase and nonlinear-phase FIR filters for a given set of specifications. Region 1 ...
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1answer
60 views

Circuit for detecting signal inversion

I am using two inductors on both sides of an ac carrying straight wire and want to detect their proximity from the wire. The coils are a set distance apart and move together laterally via mechanical ...
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1answer
32 views

How do I know the polarity of the resultant voltage of these two series-connected alternating voltage sources?

I was studying simple vector addition on All About Circuits, and the polarity assigned to the resultant voltage (see picture below) confused me. Link: https://www.allaboutcircuits.com/textbook/...
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1answer
235 views

How to find the phase spectrum of a rectangular pulse? (Fourier Transform)

How to find the phase spectrum of a rectangular pulse? The Fourier transform of a rectangular pulse $$ x(t) = \begin{cases} 1, & \text{for $|t| \le \tau /2$ } \\ 0, & \text{otherwise} \end{...
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2answers
529 views

Understanding Phase frequency detector logic

I have one of these common digital phase lock loops which compares the frequency and phase with a VCO (local oscillator) via a phase lock loop. I failed to understand why Figure (2) (A) and Figure (2)(...
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748 views

Phase angle in a ltspice AC network

With LTspice I simulate the circuit you can find in the image. I simulate and measure the differential voltage on the nodes around the inductor and R2. This simulates a bode-plot (you can find an ...
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2answers
428 views

Make FTDI 2232D do SPI mode 1 properly? Data seems 1/2 clock cycle off

This capture by a Saleae Logic Pro 8 (v 1.2.18) shows the result of transmitting (MOSI data) 0x20 0x11. Unfortunately it is interpreted and shown as ...
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1answer
430 views

lock-in amplifier (AD630)

I ve got a signal that consists of 2 square waves at 2 different frequencies at the kHz range, about 10 Hz apart.I need to determine the relative amplitudes of 2 different known frequencies and I was ...
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1answer
111 views

Transfer function of a digital phase frequency detector

I'm confused about the transfer function of a digital phase frequency detector. Why can we say that the pfd output is proportional to the phase error? The pfd (with charge pump) generates current ...
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2answers
130 views

Measure phase difference with less than a full wave?

I am interested in aircraft altitude measurement during approach. Off the shelf sonar doesn't provide enough distance, and inexpensive radio sensors don't provide a short enough distance. I have seen ...
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2answers
121 views

Low Noise Amplifier and Input/Output Phase

I've been designing LNAs for a brief time and I was wondering why the input and output phases is usually never cared for or measured when measuring the specs of the LNA. For example, the only specs we ...