Determining phase mismatch between two channels in labview. It has been implemented using openchoice desktop software and an excel spreadsheet called. Evaluation of phase difference between two acquired signals. I want to measure the accurate and constant phase difference between two waves to measure the power factor. Is it possible to implement a measurement into picoscope 6 that calculates the phase shift in deg between ch a and. Labview measurements manual chalmers university of technology. The work includes the development of the hardware and software, as well as a comparison of the accuracy of the two measurement methods.
How to use cursor in waveform graph of labview software. Impedance measurement setup based on offtheshelf pxi. The labview program, which is used for the daq board control, further data. Labview code for finding phase difference between two sine waves. Measurement system for soil complex resistivity based on.
Since, the lefthanded and righthanded circular states undergo phase shift in opposite directions, i. All instruments are supplied with easytouse selfexplanatory measurement software. Phase coherent acquisition and generation pcag toolkit is based on the ni pxi platform. A labview based simulation of lissajous pattern using daq. Phase angle voltmeters since the development of the first phase angle voltmeter pav over 50 years ago, north atlantic industries has been the industry leader in ac measurement instrumentation. Picoscope 4424 phase angle measurements pico technology. Labviewphase meter electrical engineering electronics. Measuring relative phase between two waveforms using an. Pdf phaselocking control of the coriolis meters resonance. Signalexpress implementation in signalexpress create a tone extraction step to determine the phase value for each channel. Also we try to replace the dso by a labview software. The systems concerned used loranc, goes satellite transmissions, and hbg radio transmissions to obtain synchronization of reference time at different locations in a power system.
The phase difference will remain the same between the two low frequency signal. In order to improve the accuracy of the measurement of battery internal resistance, a leadacid battery internal resistance measurement system was designed using the ac injection method and labview software. Phase difference measurement by means of digital sampling. The system is based on labview software, design a stable sin signal produce program and data acquisition program. The measurement is based on discrete fourier transform dft and maximum likelihood ml estimation of the signals properties. Now i want to acquire some measurements displayed on the scope such as rms voltage on channel 1, phase difference between channels 3 and 4 etc. An example is given in order to clarify the usage of the function.
Complex resistivity of soil must be measured using lowfrequency power supply to overcome the skin effect, but, because of using higher frequency, the existing conventional complex resistivity meter is not suitable for soil. For softwarebased measurement, an appropriate phase measurement module of labview can be used. Spectraldomain lowcoherence interferometry for phase. The signals are angle outputs of a rotating torque sensor. Measurement software for impedance analyzer all instruments are supplied with easytouse selfexplanatory measurement software. Apr 08, 2019 the labview full and professional development systems include a basic fft power spectrum vi which can be used to create simple frequency domain plots from time domain data. Different hardware and software components can make up a virtual.
Based on feedback by our customers, sinephase is commited to continuously extend its library of. A phase difference measurement program based on a fast fourier transform fft algorithm was compiled on labview software. Better estimation of phase difference between two signals with. Generate as low frequency as possible, from both of the high frequency signal. If without deskew calibration, up to what frequency the phase difference measurement between channels is acceptable and if with deskew calibration, what is the difference. Measurement system for soil complex resistivity based on labview.
A labview based simulation of lissajous pattern using daq card. In addition to the wide range of functions provided with the standard measurement software for impedance analyzer, sinephase also offers optional tools like the fitting tool or the correlation tool. The measurement of the impedances of the induction motor windings is not an objective of the simulation. This vi allows the user to execute and display the results of measurements between up to four of the digital channels, d0 d15, replicating the scopes front panel functionality. The method has been implemented as a virtual instrument using the labview packet. Pdf the coriolis meter is a resonanttype sensor that is used for measuring the mass flowrate and the density of fluids. One common use is the measurement of the phase or group delay of a unit. These values get a high precision time stamp and together with the values of power frequency, power frequency change rate and optional binary data that are also time stamped are transmitted to a central analysis station. In this video we will come to know how to use cursor in labview software to measure the time difference between two point in the waveform graph. Labview electrical power suite the labview electrical power suite offers a set of palettes with a variety of power measurements and analyses to help you build a custom power test or monitoring system with labview. I know the definition of frequency, i know fourier analysis, etc. I need assistance measuring the phase difference between two digital signals 0 to 5 volts.
Software is developed in the labview graphical programming environment. Measuring frequency and amplitude of analog signal with labview. I am currently working a project based on synchronising two generators. Another method for calculating phase difference using labview is to use the phasor vi from the electrical power measurement palette. Labview phase meter the task is to make a model of a digital phase meter, a device for measuring the phase shift and the front panel. In this paper, an effort is made to obtain a lissjous pattern using daq card and measure the phase difference between two signals acquire by daq. Phase measurement of threephase power based on labview. The co 2 content in the gas was measured by an ir detector and continuously logged by labview software ver 6. Labview provides the flexibility of integration of data acquisition softwarehardware with the process control application software for automated test and measurement applications.
Design, development and comparison of two different. The geometrical position of all subjects was carefully maintained as similar as possible for all measurements. This program was used to measure the phase difference between the two input signals to the pci5124 acquisition card. I had high hopes for this one, but after some back and forth with the support team at tektronix, found that this actually only measures the average phase difference between the first two pulses on the screen. My approach to determine the phase difference is to measure the time when sine wave crosses zero. Hi guys, i need help in this program that im writing. Before developing the system based on ni hardware and software, we took measurements with the dc magnetic field measurement system constructed with a hall probe and a 3d movement device figure 4. The phase shift equation is ps 360 td p, where ps is the phase shift in degrees, td is the time difference between waves and p is the wave period. Pdf a simple, virtual phase shift meter researchgate.
The software shall be of the function to determine the time difference at the zerocrosses of the two signals with confirmed errors. Do that to the other signal as well and find the difference between the signals. Hi, im using the labjack ue9 to read in two ac signals current and voltage into ports ain0 and ain1. I want to measure phase difference between the voltage and current of sine wave with frequency up to 15 mhz. May 23, 2019 another method for calculating phase difference using labview is to use the phasor vi from the electrical power measurement palette. Virtual capacitance meter based on ratiometric voltage. Does anyone have any idea on how i can write a code to perform. I am trying to interface an oscilloscope rigol ds1054z with labview, so far i have installed the ivi drivers from rigol and use nis example vis that allow me to acquire a continuous waveform similar to this one now i want to acquire some measurements displayed on the scope such as rms voltage on channel 1, phase difference between channels 3 and 4 etc. Use labview to acquire voltage data from the pressure. The ms2720t represents the highest performance handheld spectrum analyzers available in the world as anritsu pushes the envelope closer to benchtop quality.
Labviewphase meter the task is to make a model of a digital phase meter, a device for measuring the phase shift and the front panel. Phase difference measurement ni community national. Automated efficiency measurement of three phase induction. Plotting amplitude versus frequency data in labview. The media on which you receive national instruments software are warranted not to fail to execute programming instructions, dueto defects. It is also possible to create standalone executables and shared libraries, like dlls, because labview is a true 32bit compiler. A software is to be developed with labview to record and compare two. An analyzer calibration run was performed before every measurement, and the 2 points used being pure n 2 0% co 2 and 0. Karaoke vi discussed here, is developed in ni labview software. When the opposite is true, the phase measurement is negative. To begin to learn about sensors and data acquisition hardware and software. The base edition includes functions for rms, power factor, real power, apparent power, phase angle calculations, and energy. To start programming with the new toolkit, follow the download link above and install the evaluation version of the labview electrical power suite full edition.
Let us check out some of the important features of this software. Xy view is also capable of more advanced operations, such as plotting a math channel against a. Mar, 2018 dividing the frequency into 1 gives the period, or duration of each cycle, so 1100 gives a period of 0. A onephase, distributionlevel phasor measurement unit for.
The latter will require an additional measurement of the phase difference between two voltages, either by software or by hardware circuit. Pmu overview of function a phasor measurement unit pmu measures the phasor values of current and voltage. I am trying to calculate the phase difference between two different simulated sine. Phase unwrapping works by examining the difference of two successive phase values to determine if a jump has occured and correct for it. Place the daq assistant on the block diagram by leftclicking. The black port provides a return path so that the resistance to be measured forms part of a circuit. The lia can be used to measure the small signals, even in presence of. Alternatively, a precision phase measurement circuit many be designed and developed around an operational. Its purely a problem about programming with labview, and i cant find anything about that. Dividing the frequency into 1 gives the period, or duration of each cycle, so 1100 gives a period of 0.
Thus, when level crossings a occurs after level crossings b ref, the phase measurement is positive. Phase shift method for distance measurements rp photonics. Im using a slightly adjusted version of ue9 stream simple example vi to do this. By using builtin dual channel spectrum pallet in labview 2010 i am having a continously changing phase. The media on which you receive national instruments software are warranted not to fail to execute programming instructions, dueto defects in materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other documentation. Main labview measurements manual national instruments. Hioki benchtop power meters and power analyzers are best in class power measuring instruments for measuring single to threephase lines with a high degree of precision and accuracy. Evaluation of phase difference between two acquired. All of this is for the purpose of tracking the angle of rotation as i measure torque. The application will include time and phasor representations of. The present code is a matlab function that provides a measurement of the phase difference between two signals. Calibrate a flow sensor that uses a pressure sensor to measure head loss in a short section of tubing. Take the average of both of those signal into a reim to polar, snag out the phase value and convert to degrees.
In section b, phase angle and the original waveform are shown for the current data block. A resonant type of modulator can be operated with relatively low input voltage, but only with a small range of modulation frequencies, making the removal of the mentioned ambiguity. Please also describe the principle of implementation, and if possible, draw a parallel with the real device since i do not know the electronics very well. Estimation of uncertainty in measurement of power quality. The functionality from the electrical power measurement palette for labview is now part of the labview electrical power suite as the basic measurement palette. Scale the time base by a factor of ten expand the plot horizontally, so that each division will be 9, 6, or 4. Phasor measurement unit pmu general protection siemens. In the phase measurement of three phase electricity signal, the measurement accuracy based on traditional fft algorithm is restricted by harmonic components. A software is to be developed with labview to record and compare two voltage signals simultaneously. Dec 08, 2011 a software is to be developed with labview to record and compare two voltage signals simultaneously.
Do i need to use deskew pulse generator signal source and fixture. There are two different types of voltage measurements. To find the phase shift between two signals ch a and b i. The background music due to the stereo mixing has no phase time relationship. Building a labview and pxibased phase shifter diagnostic. A simple function allows calculating of the measured phase shift. Construction of a phasor measurement unit pmu for power. Sinephase measurement software for impedance analyzer. For software based measurement, an appropriate phase measurement module of labview can be used. Diagram of the our implementation of the single phase pmu structure a. I have obtained the red phase voltage of both generators. The labview full and professional development systems include a basic fft power spectrum vi which can be used to create simple frequency domain plots from time domain data. For finding the phase shift between two square waves, use the pulse measurements vi. To this end, with the discrete fourier transform and spectrum analysis, a measurement system for soil complex resistivity based on labview virtual.
With the pcag toolkit and ni hardware, you can conduct phasecoherent generation andor acquisition of rf signals. This vi determines the pulse center and pulse duration of each wave. This plot could be the iv curve of a component such as a capacitor, inductor, a diode, or a lissajous figure showing the phase difference between two periodic waveforms. The power modulation may be obtained with an electrooptic modulator, acting on a continuouswave laser beam. Phase difference measurement with matlab implementation. Virtual instrumentation is the use of customizable software and modular measurement hardware to create userdefined measurement systems, called virtual instruments. Phase coherent acquisition and generation by insol. Troubleshooting these problems requires instruments that can take accurate measurements and analysis of power quality. Ni electrical power measurement palette for labview. Introduction to pressure sensors, data acquisition, and labview objective. Labview lets you create test and measurement, data acquisition, data logging, measurement analysis and report generation applications. The pw3335 delivers high measurement accuracy and handles currents with higher crest values in lower current ranges i. Resistance measurement design of the battery based on labview. Rightclick on the block diagram and select express.
I have also configured a tektronix tds2014b oscilloscope with labview 2012 software and i would like to measure the phase difference between two waveforms using labview. Measure td, the smallest time difference between occurences of the feature on the two waveforms. Apr 10, 2016 the present code is a matlab function that provides a measurement of the phase difference between two signals. Signal processing and analysing big mass data using labview. Phase vi labview 2012 jitter analysis toolkit help. This vi uses level crossings b ref as the reference against which to measure the phase difference in level crossings a. When the current and voltage has a phase difference, from a circuit with an. Using this cursor we can measure lightning impulse. Labview measurements manual national instruments labview. This system can measure the magnetic field distribution by slowly moving the hall probe into the phase shifter using the 3d movement device, and. This generation introduces a touch screen, fullband tracking generators to 20 ghz, and bestinclass performance for dynamic range, danl, phase noise, and sweep speed.
Labview measurements manual april 2003 edition part number 322661b01. Multiply the signal by another sine of the same frequency at 0deg phase and in parallel multiply it by another sine of same frequency at 90deg phase. Using analog multiplexers in the signal path increases the number of measurement. Dual channel capability capability to transfer data points to a computer this method was developed using the tektronix 2012b oscilloscope. This is what i need to know to find the frequency without fft. Is there a way to easily determine the phase difference or mismatch. Once you have this information, you can calculate the phase shift between the two waves as shown in figure 2. How to measure phase difference of two signals of the same. Sep 07, 2016 in this video we will come to know how to use cursor in labview software to measure the time difference between two point in the waveform graph. Measuring relative phase between oscilloscope traces using the curvefitting method requirements. Measurement of frequency, amplitude and phase myrio. Summary of signal sources and measurement systems 410.
You can use the pcag toolkit for both single and multichassis systems. With the pcag toolkit and ni hardware, you can conduct phase coherent generation andor acquisition of rf signals. The highprecision time synchronization via gps allows comparing measured values synchrophasors from different substations far apart and drawing conclusions as to the system state and dynamic events such as power swing conditions. Power quality analysis voltage sags and swells, interruptions, harmonics, and highfrequency noise are issues associated with grid applications. Normally, i would run first angle to a counter and the second angle through an updown gate on the daq board, however my board has no such updown gate. Frequency period phase difference delay burst positive. To identify the first pair of cycles to measure, this vi finds the edge in level crossings. Phasor measurement units pmus measure current and voltage by amplitude and phase at selected stations of the transmission system. Modulation frequencies of many megahertz or even multiple gigahertz are easily obtained.
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