The work includes the development of the hardware and software, as well as a comparison of the accuracy of the two measurement methods. Pdf phaselocking control of the coriolis meters resonance. Virtual instrumentation is the use of customizable software and modular measurement hardware to create userdefined measurement systems, called virtual instruments. Phase difference measurement by means of digital sampling. Im using a slightly adjusted version of ue9 stream simple example vi to do this. Labviewphase meter electrical engineering electronics.
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. Dividing the frequency into 1 gives the period, or duration of each cycle, so 1100 gives a period of 0. Labview simulation of induction motors zhaoxian zhou and james matthew johnson school of computing, university of southern mississippi. 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. 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. Xy view is also capable of more advanced operations, such as plotting a math channel against a.
The base edition includes functions for rms, power factor, real power, apparent power, phase angle calculations, and energy. Dec 08, 2011 a software is to be developed with labview to record and compare two voltage signals simultaneously. Frequency period phase difference delay burst positive. Based on feedback by our customers, sinephase is commited to continuously extend its library of. Does anyone have any idea on how i can write a code to perform. Phase measurement of threephase power based on labview. It is also possible to create standalone executables and shared libraries, like dlls, because labview is a true 32bit compiler. Signalexpress implementation in signalexpress create a tone extraction step to determine the phase value for each channel. Dual channel capability capability to transfer data points to a computer this method was developed using the tektronix 2012b oscilloscope. To identify the first pair of cycles to measure, this vi finds the edge in level crossings. A labview based simulation of lissajous pattern using daq. Since, the lefthanded and righthanded circular states undergo phase shift in opposite directions, i. The media on which you receive national instruments software are warranted not to fail to execute programming instructions, dueto defects.
I need assistance measuring the phase difference between two digital signals 0 to 5 volts. Analysis and comparison between fft and digital correlation theory in phase difference measurement j. Apr 10, 2016 the present code is a matlab function that provides a measurement of the phase difference between two signals. Software is developed in the labview graphical programming environment. A software is to be developed with labview to record and compare two. One common use is the measurement of the phase or group delay of a unit.
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. Measuring relative phase between oscilloscope traces using the curvefitting method requirements. 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. The geometrical position of all subjects was carefully maintained as similar as possible for all measurements. In section b, phase angle and the original waveform are shown for the current data block. Pmu overview of function a phasor measurement unit pmu measures the phasor values of current and voltage. A simple function allows calculating of the measured phase shift. When the opposite is true, the phase measurement is negative. Signal processing and analysing big mass data using labview. Ni electrical power measurement palette for labview.
Calibrate a flow sensor that uses a pressure sensor to measure head loss in a short section of tubing. A short time may also be spent on installing labview software on. Mar, 2018 dividing the frequency into 1 gives the period, or duration of each cycle, so 1100 gives a period of 0. A labview based simulation of lissajous pattern using daq card. The lia can be used to measure the small signals, even in presence of. An example is given in order to clarify the usage of the function. 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. The application will include time and phasor representations of. Phase coherent acquisition and generation pcag toolkit is based on the ni pxi platform. 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. Virtual capacitance meter based on ratiometric voltage. All instruments are supplied with easytouse selfexplanatory measurement software.
The pw3335 delivers high measurement accuracy and handles currents with higher crest values in lower current ranges i. 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. Automated efficiency measurement of three phase induction. 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.
Summary of signal sources and measurement systems 410. Automated efficiency measurement of three phase induction motor using labview conference paper pdf available january 20 with 924 reads how we measure reads. This program was used to measure the phase difference between the two input signals to the pci5124 acquisition card. Do that to the other signal as well and find the difference between the signals. There are two different types of voltage measurements. 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. Phase vi labview 2012 jitter analysis toolkit help. Introduction to pressure sensors, data acquisition, and labview objective. Evaluation of phase difference between two acquired signals. For software based measurement, an appropriate phase measurement module of labview can be used. Measurement system for soil complex resistivity based on labview. How to use cursor in waveform graph of labview software. Building a labview and pxibased phase shifter diagnostic. The system is based on labview software, design a stable sin signal produce program and data acquisition program.
Measurement of frequency, amplitude and phase myrio by elgonza. Using analog multiplexers in the signal path increases the number of measurement. I am currently working a project based on synchronising two generators. Thus, when level crossings a occurs after level crossings b ref, the phase measurement is positive. 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. Different hardware and software components can make up a virtual. 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. The ms2720t represents the highest performance handheld spectrum analyzers available in the world as anritsu pushes the envelope closer to benchtop quality. By using builtin dual channel spectrum pallet in labview 2010 i am having a continously changing phase. Measuring relative phase between two waveforms using an. 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. For softwarebased measurement, an appropriate phase measurement module of labview can be used.
How to measure phase difference of two signals of the same. To find the phase shift between two signals ch a and b i. Is there a way to easily determine the phase difference or mismatch. Phase shift method for distance measurements rp photonics. This vi determines the pulse center and pulse duration of each wave. Let us check out some of the important features of this software. The measurement is based on discrete fourier transform dft and maximum likelihood ml estimation of the signals properties. This system can measure the magnetic field distribution by slowly moving the hall probe into the phase shifter using the 3d movement device, and. Plotting amplitude versus frequency data in labview. A software is to be developed with labview to record and compare two voltage signals simultaneously. Picoscope 4424 phase angle measurements pico technology. 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. Our name has become synonymous with innovation and quality. Main labview measurements manual national instruments.
Phasor measurement units pmus measure current and voltage by amplitude and phase at selected stations of the transmission system. 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. Better estimation of phase difference between two signals with. 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. Phasor measurement unit pmu general protection siemens. Phase difference measurement ni community national. Measurement system for soil complex resistivity based on. Diagram of the our implementation of the single phase pmu structure a. I want to measure phase difference between the voltage and current of sine wave with frequency up to 15 mhz. Rightclick on the block diagram and select express. Hi guys, i need help in this program that im writing. A phase difference measurement program based on a fast fourier transform fft algorithm was compiled on labview software.
Using this cursor we can measure lightning impulse. Power quality analysis voltage sags and swells, interruptions, harmonics, and highfrequency noise are issues associated with grid applications. The power modulation may be obtained with an electrooptic modulator, acting on a continuouswave laser beam. Modulation frequencies of many megahertz or even multiple gigahertz are easily obtained. Construction of a phasor measurement unit pmu for power. The software shall be of the function to determine the time difference at the zerocrosses of the two signals with confirmed errors. 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. 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. Phase unwrapping works by examining the difference of two successive phase values to determine if a jump has occured and correct for it. To this end, with the discrete fourier transform and spectrum analysis, a measurement system for soil complex resistivity based on labview virtual. This vi uses level crossings b ref as the reference against which to measure the phase difference in level crossings a. 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.
Troubleshooting these problems requires instruments that can take accurate measurements and analysis of power quality. The measurement of the impedances of the induction motor windings is not an objective of the simulation. The labview program, which is used for the daq board control, further data. Resistance measurement design of the battery based on labview. Labview measurements manual april 2003 edition part number 322661b01. With the pcag toolkit and ni hardware, you can conduct phasecoherent generation andor acquisition of rf signals. My approach to determine the phase difference is to measure the time when sine wave crosses zero. I am trying to calculate the phase difference between two different simulated sine. Generate as low frequency as possible, from both of the high frequency signal.
Sinephase measurement software for impedance analyzer. Spectraldomain lowcoherence interferometry for phase. A onephase, distributionlevel phasor measurement unit for. 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. Design, development and comparison of two different. Measuring frequency and amplitude of analog signal with labview. May 23, 2019 another method for calculating phase difference using labview is to use the phasor vi from the electrical power measurement palette. Hi, im using the labjack ue9 to read in two ac signals current and voltage into ports ain0 and ain1. Labview code for finding phase difference between two sine waves. The co 2 content in the gas was measured by an ir detector and continuously logged by labview software ver 6. The method has been implemented as a virtual instrument using the labview packet. Do i need to use deskew pulse generator signal source and fixture. Also we try to replace the dso by a labview software. Labview measurements manual chalmers university of technology.
In the phase measurement of three phase electricity signal, the measurement accuracy based on traditional fft algorithm is restricted by harmonic components. The background music due to the stereo mixing has no phase time relationship. 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. 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. Phase coherent acquisition and generation by insol. The phase difference will remain the same between the two low frequency signal. 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. With the pcag toolkit and ni hardware, you can conduct phase coherent generation andor acquisition of rf signals. I want to measure the accurate and constant phase difference between two waves to measure the power factor.
Evaluation of phase difference between two acquired. Estimation of uncertainty in measurement of power quality. 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. Pdf a simple, virtual phase shift meter researchgate. It has been implemented using openchoice desktop software and an excel spreadsheet called. Determining phase mismatch between two channels in labview.
Alternatively, a precision phase measurement circuit many be designed and developed around an operational. The signals are angle outputs of a rotating torque sensor. 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. Use labview to acquire voltage data from the pressure. Measure td, the smallest time difference between occurences of the feature on the two waveforms. 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. Measurement of frequency, amplitude and phase myrio. Another method for calculating phase difference using labview is to use the phasor vi from the electrical power measurement palette. The black port provides a return path so that the resistance to be measured forms part of a circuit.
An analyzer calibration run was performed before every measurement, and the 2 points used being pure n 2 0% co 2 and 0. Scale the time base by a factor of ten expand the plot horizontally, so that each division will be 9, 6, or 4. 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. Karaoke vi discussed here, is developed in ni labview software. Impedance measurement setup based on offtheshelf pxi. When the current and voltage has a phase difference, from a circuit with an. I have obtained the red phase voltage of both generators. The analyzed results will be interpreted as the phase differences to do phase calibrations. Is it possible to implement a measurement into picoscope 6 that calculates the phase shift in deg between ch a and. 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. Phase difference measurement with matlab implementation. Labview provides the flexibility of integration of data acquisition softwarehardware with the process control application software for automated test and measurement applications.
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. This is what i need to know to find the frequency without fft. The functionality from the electrical power measurement palette for labview is now part of the labview electrical power suite as the basic measurement palette. For finding the phase shift between two square waves, use the pulse measurements vi. Once you have this information, you can calculate the phase shift between the two waves as shown in figure 2. The latter will require an additional measurement of the phase difference between two voltages, either by software or by hardware circuit. To begin to learn about sensors and data acquisition hardware and software. Pdf the coriolis meter is a resonanttype sensor that is used for measuring the mass flowrate and the density of fluids. 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. 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. I know the definition of frequency, i know fourier analysis, etc.
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