Measure the period and the peak value at crest of a sine wave

Similar Questions

• How to get the peak value

  Can I know how to get the 2 peak values v1 and v2 and 2 duration times t1 t2.

  Since there is a small amplitude noise, difficult to use the Max simplely.

  May need to use a filter such as wavelets or TREE to Denoise it first. Can I know how to use, any Toolbox in labview. How do the curve smooth first.

  Thank you.

  I can't watch your vi now (I'm at work), but if your signals are long enough, you might consider a median filter.  You can set the number of points before and after use.  I found that it is useful for some smoothing problems (not all).

• HOW TO MEASURE THE WIDTH/TIME GAP PULSE ANALOG OF A WAVE

  HELLO EVERYONE, IM NEW TO LABVIEW. IM USING NOR USB-6008 ACCESS "ACCELEROMETER READINGS TAP" BUT I NEED TO KNOW THE AMOUNT OF TIME BETWEEN EACH PULSE OR WAVE. IM ATTACHING THE SCREENSHOT OF THIS WAVE. PLS ME GUIDE FOR MAKING of this PROGRAM, I NEED TO KNOW the TIME DIFFERENCE "Dt"...

  Thanks for your reply Sir, I can get the table of amplitude... but I can't get the time table... could you help me please

• measure the voltage gpib

  I have to be able to measure the peak voltage in an alternating signal Ridge.  However, the frequency is 40 kHz, which is too high to measure using data acquisition (because the sampling frequency ira not very high).  How can I measure the waveform using a multimeter, gpib?  Is there a sample there code that will help me?

  Thank you

  BernoulliLizard,

  In your original post, you said you wanted to measure peak to peak voltage of a 40 kHz signal.

  I don't know all voltmeter that will do that.

  Get an oscilloscope or a DAQ hardware with a high enough sampling rate.  According to the bandwidth of the signal (not the same as the frequency of the signal), the PCI card for approximately $500 devices (US$) a variety of factors to form for $1500 or less must be able to do the job.

  Lynn

• Eliminate the peaks of measure

  Hello everyone.

  I have a problem with my VI. I need to measure a signal frequency. While I measure, I have a correct value, but after reset the elapsed time sometimes, I take a pic. I can't remove it. I almost am newbie in Labview. I'll be grateful for any help with this.

  Lukasz

  Hello Lynn

  Sorry for my absence. I need to measure a frequency to simulate signals. (0 to 50 Hz frequency). All right, except that of the peaks. I can see a frequency in "Czestotliwosc. I count a Falling or Rising edge and calculate knowing his time. The elapsed time is a function of "Sync Windows" in this VI.

• Measure the voltage and the temperature simultaneously with PCI-6281

  Measure the voltage and the temperature at the same time at the same time. However, when I put the voltage and temperature in a loop, the acquisition of voltage is significantly delayed. When I put the voltage and temperature in two different loop, none of them works.  There is an example in aid of Labview as shown. This structure works fairly quickly? In addition, how a volgate get and temperature Analog DBL 1Chan 1Samp? I check the exported excel, the first column is 0, 1 the second column contains the value of the voltage, temperature value. I wonder how can I get these two values for each scan.

  ,

  Assuming that the DAQ cards can handle it, you can set an analog trigger for the channel of the tension.  Then you just X samples to get your 100us data value.  Keep the last sample.

• Measure the current and voltage using DMM sharing a port

  I want to measure pressure several times on a pcb, where I connect the ports of digital multimeters to the card using simple cards. Switching between the different voltages is done using simple. If the black port of DMM (the second from the top photo) is connected to the Earth to give the measure correct volt.

  

  And then I want to measure current through different lines. The problem is here. Given that two measurement types share a port, how do I get the correct voltage and current measurement? The second port of top would be grounded, so I can't use the method of measuring the voltage across the line through a resistance with a known value, since then the second port must not be connected to the ground. How can I use the current state of the DMM measurement? How measure current? Are there examples of this? Tried looking through manuals, but could not find the good starting points.

  

  so I can't use the method of measuring the voltage across the line through a resistance with a known value, since then the second port must not be connected to the ground.

  On all of my games to test I have to mux my land of the signal along with the salvation of my signals.

  All my mux test sets are set up for the topology 2-wire because there is no other way to do it without the weak side of switch also.

• Align the two signals and measure the Phase Shift

  Hello

  I do an experiment in which I use the NI USB-6221 DAQ card. The jury is able to make 250 k samples/second. I want to measure two voltages in a circuit and find the phase shift between them at frequencies between 1 and 10000. First I ouputted a wave sinusoidal frequency variable through the Commission and applied to a test circuit. Then I used the Board to measure the two tensions consecutively (thus reducing the maximum sampling frequency at 125 k). I used the signals align VI and measured the two phases and then calculates the phase shift (VI attached in Phase 1). It worked well for the test circuit I built in which the phase shift went way logarithmique.20 degrees ~84.5 degrees and then stabilized. At frequencies above 5 000 Hz phase shift must have remained constant, but it varies more or less 1 degree. When the phase shift is 84.5 degrees, present a degree of variability is not particularly explicit. When I asked my program on the circuit that I really wanted to measure, the phase shift went from-. 5 degrees up to about 1.2 degrees. The change in the values of phase shift at high frequencies (> 3000) was environ.2 degrees. Given the small phase shift, this variation is unacceptable. Now I tried to use a sequence to each blood individually (increase the maximum sampling frequency to 250 k) and then align the two signals and measure the phase of each shift. When I use align it and re - sample Express VI to realign the two signals, I get the message "error 20333 analysis: cannot align two waveforms with dt even if their samples are not clocked in phase." Is it possible to align two signals I describe here? I enclose the new VI as Phase 2

  Matthew,

  I think I have an idea for at least part of the problem.

  I took your program data and deleted stuff DAQ.  I have converted the Signal on the chart control and looked then what was going on with the signal analysis.

  The output of the Waveforms.vi line has two waveforms, like the entry.  However, arrays of Y in the two waveforms are empty!  It does not generate an error. After some head scratching, reading the help files and try things out, that's what I think is happening: the time t0 two input signals are 1,031 seconds apart. Since the wavefoms contains 1,000 seconds of data, there is no overlap and may not align them.

  I changed the t0 on two waveforms are the same, and it lines up.  The number of items in the tables is reduced by one. Then I increased the t0 of 0.1 seconds on the first element. The output had both greater than the entry by dt t0 t0 and the size of the arrays was 224998.  Reversing the t0 two elements shifts the phase in the opposite direction.

  What that tells me, is that you can not reliably align two waveforms which do not overlap.

  I suggest that you go to 2-channel data acquisition and that it accept the reduced sample rate.  You won't get the resolution you want, but you should be able to tell if something important happens.

  You may be able to improve the equivalent resolution by taking multiple steps with a slight phase shift. This is similar to the way that old oscilloscopes of sampling (analog) worked. Take a series of measures with the signal you are currently using.  The make enough average to minimize changes due to noise. Then pass the phase of the signal of excitement to an amount that is smaller than the resolution of phase of sampling rate and repeat the measurements.  Recall that I calculated that for a 5 kHz signal sampled at 125kHz, you get a sample every 14.4 degrees. If shift you the phase of 1 degree (to the point/mathematical simulation), you get a different set of samples for excitement.  They are always separated by 14.4 degrees.  Take another series of measures. Transfer phase another degree and repeat.  As long as your sampling clocks are stable enough so that frequency does not drift significantly (and it shouldn't with your equipment), you should be able to get near resolution of what you need.  The trade-off is that you need to perform more measurements and may need to keep track of the phase shifts between the various measures.

  Lynn

• Fit Gaussian Peak and non-linear curve Fit on small data differ from the PEAK of origin made

  Hi all

  I'm developing a program in which I have to adjust the curve of Gauss on only 4 or 5 data points. When I use the Gaussian Ridge Fit or adjustment of the curve non-linear, it connects linearly all the points so that other editing software like origin's curve fitting of Gauss on the same set of data that I have attached two images is LabVIEW with Fit Gaussian of Peak and nonlinear adjustment and other is original.

  The data are

  X                       Y

  799.09857 257
  912.25256 641

  1026.00366 1516
  1137.92871 1118
  1253.43713 329

  Interesting.

  The initial default values assume all are NaN, which causes the LV calculate conjecture.  The default values for the parameter Bounds +/-Inf with the exception of the offset that are both zero. This, of course, forces the output zero offset.  It seems a strange fault, but they may have a good reason for it.

  Change the limits of compensation to something else translates the output being offset ~ 215 and the Center moves to ~ 1053.  These correspond the original result to 5 significant digits.

  Lynn

  

• Measurement of voltage and the voltage with CompactDAQ display?

  OK, I just got my CompactDAQ hooked up with two modules (9225, 9239) and am able to simple single-phase voltage (120 VAC)... I connected an indicator, and it gives me shooting random sine wave values and what I'm looking for a simple voltage reading.  MAX and the DAQ assistant both work very well to the configuration task and I can see the signal in there.

  I dug through the DAQmx, watched functions in the knowledge base and have searched here without any real results.  I also downloaded the EPM resource kit, but it's tools for further on the road...  It seems to me that this should be simple crazy, but maybe I go too hard or just looking is not in the right place?  I would greatly appreciate a point in the right direction!

  Thank you!

  Chad

  With the help of... Windows XP (SP3), LabVIEW 2009, cDAQ-9174, 9225, 9239.

  Chad,

  When you say "simple voltage readout" are you referring to the effective voltage of the AC signal?  If Yes, you can use the Express VI 'Amplitude and level measures' to calculate the desired value.

  

  Hope this helps, otherwise if specify you what you are looking for a little I will try again.

  ~ SimonH

• How to place numerical values on the peak in graphs

  Hello

  Is it possible to put the numerical value on the crest of the wave as in the below image where the yellow dots on the Ridge, we put value digital pic?

  

  It needs a lot of cleanup (and there are probably still have a better way in general), but it should at least help you get started.

  

  I used the Detector.vi Peak, which requires the LV Full Development System.

• Move the engine and perform a measurement (thorlabs motors and drivers)

  Hello world

  I was just born in this world of Labview and I m quite lost. I´ll explain my situation:

  Queue BEFORE the start of the measurement time is something that you must do it manually because it is up to the user.

  Until how long to wait for the measurement of complete, the manual includes many examples of the use of registers and implements buffer to find out when the measurement is finished using a linear scan (this is how I do it).  The idea is to set buffer equal number of datapoints (say 100 on your beach IV), ask what to measure (current, voltage, both) and the records to see when the buffer is full (say all 100 to 500 ms) election.  Let the keithley 2400 settle tensions for you on the specified range and returns the set of data, once completed.

  As far as when the movement is finished, you will have to see if there is a way to detect that your equipment (stick otherwise with the late pre programmed).   If they are lit IV measures, you could do the following.  The ABSENCE of any power source and measure the current.  Check periodically after the movement commands are sent.  Once you measure a current, the CDC for the cell, you must contact.

  For data storage, use the shift on the state machine itself registers.  Erase the registry when starting an analysis, then insert each measure if it is taken (table 2D or array of clusters).  Another possibility is to use another while loop to back up data (a consumer) with the data being past in a queue and added to the file after each scan (this will help if you are concerned about breakage resulting from data loss).  After each measurement, queue the data to a queue managed by the consumer.  (you will need to keep track of which file to add data to).

• acquire a signal and the rms value in a table every second

  Hello everyone,

  Sorry, but I am known in the world of LabView and I'm going crazy because I can't understand how to do a simple thing (or what it tends to be in my mind).

  As said by the object,
  my wish is to acquire a digital (a through the DAQmx) continuous (it's ok for this part), get the RMS (or average) of such acquired signal (thanks to the Amplitude and levels of measurement, for example) and put the value in a table (1 d); and, every second.

  In one sentence: acquire a signal, the average value, put in a table, and then restart each second. In the end, for example, the program for 1 minutes gives me 60 value in the table.

  Is someone can help me?

  Thank you in advance.

  Viviogs.

  First of all, I'm not sure that you can be sure exactly a second measurement using this technique.  If the precise timing is important, I think that you need a timed loop.

  That said, if the only problem you have is how to write the table indexed in a spreadsheet, you just need to use "Write in the worksheet file."  See here.

• My computer laptop stop periodically and gives the following codes BCCode d1, 00000010 BCP1, BCP2 00000002 BCP3 00000001, 8A25F1C8 BCP4.

  My stop laptop periodically and gives the following codes:
   
  BCCode d1
  BCP1 00000010
  BCP2 00000002
  BCP3 00000001
  8A25F1C8 BCP4

  I was not able to find a solution to restart windows by clicking find a solution online. The system is free of viruses and other items malcious. Any ideas would be helpful because my laptop did not come with a repair disc and I'm afraid to make one with these questions.

  Thank you

  Hello

  Think video drivers especially if it may be others. Refer to the section of driver in my generic bluescreen
  methods of troubleshooting below. BIOS, low and antispyway/antivirus/security chipset drivers
  programs may also cause this. Check the resolution of problems and when you get to the section driver view
  for generic methods in the next message and then back to the if necessary troubleshooting tool.

  BCCode: D1 0x000000D1

  Cause

  A driver tried to access a pageable (or that is completely invalid) address while the IRQL was too high.

  This bug check is usually caused by drivers who used a wrong address.

  If the first parameter has the same value as the fourth parameter, and the third parameter indicates a runtime operation, this bug check was probably caused by a driver who was trying to run code when the code itself has been paginated outside. The possible causes for the error page are:

  • The function was marked as pageable and was operating at an IRQL higher (including obtaining a lock).
  • The function call was made to a function in another pilot, and that this driver has been unloaded.
  • The function was called by using a function pointer that was an invalid pointer.

  ======================================================

  Look in the Event Viewer to see if something is reported on those.
  http://www.computerperformance.co.UK/Vista/vista_event_viewer.htm

  MyEventViewer - free - a simple alternative in the standard event viewer
  Windows. TIP - Options - Advanced filter allows you to see a time rather
  of the entire file.
  http://www.NirSoft.NET/utils/my_event_viewer.html

  -------------------------------------------------------------------------
  Also this, so you can see the probable bluescreens.

  Windows Vista restarts automatically if your computer encounters an error that requires him to plant.
  http://www.winvistatips.com/disable-automatic-restart-T84.html

  -------------------------------------------------------------------------

  Here are a few ways to possibly fix the blue screen issue. If you could give the blue screen
  info that would help. Such as ITC and 4 others entered at the bottom left. And all others
  error information such as codes of STOP and info like IRQL_NOT_LESS_OR_EQUAL or PAGE_FAULT_IN_NONPAGED_AREA and similar messages.

  As examples:

  BCCode: 116
  BCP1: 87BC9510
  BCP2: 8C013D80
  BCP3: 00000000
  BCP4: 00000002

  or in this format:

  Stop: 0 x 00000000 (oxoooooooo oxoooooooo oxoooooooo oxooooooooo)
  Tcpip.sys - address blocking 0 x 0 00000000 000000000 DateStamp 0 x 000000000

  It is an excellent tool for displaying the blue screen error information

  BlueScreenView scans all your minidump files created during 'blue screen of death '.
  hangs and displays information about all accidents of a table - free
  http://www.NirSoft.NET/utils/blue_screen_view.html

  BlueScreens many are caused by old or damaged, drivers particularly video drivers but it
  are other causes.

  You can do without if needed fail or the Vista DVD or recovery command prompt mode
  Options if your system was installed by the manufacturer.

  This tells you how to access the System Recovery Options and/or a Vista DVD
  http://windowshelp.Microsoft.com/Windows/en-us/help/326b756b-1601-435e-99D0-1585439470351033.mspx

  You can try a system restore to a point before the problem started when one exists.

  How to make a Vista system restore
  http://www.Vistax64.com/tutorials/76905-System-Restore-how.html

  -------------------------------------------------------------------------

  Start - type this in the search box-> find COMMAND at the top and RIGHT CLICK – RUN AS ADMIN

  Enter this at the command prompt - sfc/scannow

  How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe)
  program generates in Windows Vista cbs.log
  http://support.Microsoft.com/kb/928228

  The log can give you the answer if there is a corrupted driver. (Says not all possible
  driver problems).

  Also run CheckDisk, so we cannot exclude as much as possible of the corruption.

  How to run the check disk at startup in Vista
  http://www.Vistax64.com/tutorials/67612-check-disk-Chkdsk.html

  -------------------------------------------------------------------------

  Often drivers up-to-date will help, usually video, sound, network card (NIC), WiFi, part 3
  keyboard and mouse, as well as of other major device drivers.

  Look at the sites of the manufacturer for drivers - and the manufacturer of the device manually.
  http://pcsupport.about.com/od/driverssupport/HT/driverdlmfgr.htm

  How to install a device driver in Vista Device Manager
  http://www.Vistax64.com/tutorials/193584-Device-Manager-install-driver.html

  How to disable automatic driver Installation in Windows Vista - drivers
  http://www.AddictiveTips.com/Windows-Tips/how-to-disable-automatic-driver-installation-in-Windows-Vista/
  http://TechNet.Microsoft.com/en-us/library/cc730606 (WS.10) .aspx

  -------------------------------------------------------------------------

  How to fix BlueScreen (STOP) errors that cause Windows Vista to shut down or restart
  quit unexpectedly
  http://support.Microsoft.com/kb/958233

  Troubleshooting, STOP error blue screen Vista
  http://www.chicagotech.NET/Vista/vistabluescreen.htm

  Understanding and decoding BSOD (blue screen of death) Messages
  http://www.Taranfx.com/blog/?p=692

  Windows - troubleshooting blue screen errors
  http://KB.wisc.edu/page.php?id=7033

  -------------------------------------------------------------------------

  In some cases, it may be necessary.

  The Options or Vista recovery disk Startup Repair

  How to do a startup repair
  http://www.Vistax64.com/tutorials/91467-startup-repair.html

  This tells you how to access the System Recovery Options and/or a Vista DVD
  http://windowshelp.Microsoft.com/Windows/en-us/help/326b756b-1601-435e-99D0-1585439470351033.mspx

  I hope this helps.

  Rob - bicycle - Mark Twain said it is good.

• How to get the greatest value of the width and/or height of two open images?

  Re: Photoshop CS6, worm 13.0.1 (x 32) on Win 7 SP1 (64-bit) 16 GB of RAM

  My Photoshop workflow processes repeatedly changing the games of two images of an irregularly shaped object, centered on a white background. After completing the changes, each canvas needs to be cropped, then the two resizing to square canvas of the same size.

  The question I have is the last step: How can I determine the largest single dimension to use as the px width, height px square open two images?

  The following script seems to work, but I don't know if I correctly selects active documents. Is app.activeDocument = app.documents [0] always the document being edited? And app.activeDocument = app.documents [1] no active document!

  I am a programmer of VBA/VB.Net with no experience in Javascript. I'd greatly appreciate some expert opinions on what follows, my first attempt at a Photoshop script.

  #target photoshop
  < menu > automate < / menu >
  Save the current configuration
  var savedRuler = app.preferences.rulerUnits;
  app.preferences.rulerUnits = Units.PIXELS;
  whole white background
  var backgroundC = new SolidColor();
  backgroundC.rgb.red = 255;
  backgroundC.rgb.green = 255;
  backgroundC.rgb.blue = 255;
  backgroundColor = backgroundC;
  get the maximum size of the first image
  app.activeDocument = app.documents [0] / / the value first image
  var h = app.activeDocument.height;
  var l = app.activeDocument.width;
  var maxDim = w;
  if(h>w) maxDim = h;
  measure the second image and then get the two images max dimension
  app.activeDocument = app.documents [1] / / for the second image
  H2 var = app.activeDocument.height;
  W2 var = app.activeDocument.width;
  if(W2>maxDim) maxDim = w2;
  if(H2>maxDim) maxDim = h2;
  resize image second
  app.activeDocument.resizeCanvas (maxDim, maxDim, AnchorPosition.MIDDLECENTER);
  resize the image first
  app.activeDocument = app.documents [0] / / the value first image
  app.activeDocument.resizeCanvas (maxDim, maxDim, AnchorPosition.MIDDLECENTER);
  clean
  app.preferences.rulerUnits = savedRuler;

  Try this

  #target photoshop
  //save the current setting
  var savedRuler= app.preferences.rulerUnits;
  var orig_display_dialogs = app.displayDialogs;
  app.preferences.rulerUnits = Units.PIXELS;
  app.displayDialogs = DialogModes.NO; // Set Dialogs off
  
  var defaultFolder = "~";
  var inputFolder = Folder.selectDialog("Choose a folder of images to process.", defaultFolder);
  var outputFolder = Folder.selectDialog("Choose a folder to export resized images to.", defaultFolder);
  
  var fileList = inputFolder.getFiles(/\.(nef|cr2|crw|dcs|raf|arw|orf|dng|jpg|jpe|jpeg|tif|tiff|psd|eps|png|bmp)$/i);
  if (fileList.length%2===0) { // even number of files
    // Loop through files
    for (var i = 0; i < fileList.length; i++) {
  
       app.open(fileList[i]); // Open First
       app.activeDocument.trim(TrimType.TOPLEFT);
       app.activeDocument.resizeImage(null,null,1200,ResampleMethod.NONE);
       var h = app.activeDocument.height;
       var w = app.activeDocument.width;
  
       i++;
       app.open(fileList[i]); // open second
       app.activeDocument.trim(TrimType.TOPLEFT);
       app.activeDocument.resizeImage(null,null,1200,ResampleMethod.NONE);
       var h1 = app.activeDocument.height;
       var w1 = app.activeDocument.width;
  
       var maxDim = Math.max (Math.max (w, w1), Math.max (h, h1)) +10;
  
       app.activeDocument.resizeCanvas (maxDim, maxDim, AnchorPosition.MIDDLECENTER); //resize
       // save second and close
       if (app.activeDocument.name.lastIndexOf(".")!=0 ) { var Name = app.activeDocument.name.substring(0, app.activeDocument.name.lastIndexOf(".")); }
       else {var Name =  app.activeDocument.name;}
       var saveFile = outputFolder + "/" + Name ;
       SaveAsJPEG(saveFile, 10);
       activeDocument.close(SaveOptions.DONOTSAVECHANGES);     // Close the just save 
  
       app.activeDocument.resizeCanvas (maxDim, maxDim, AnchorPosition.MIDDLECENTER); //resize
       // save and close First
       if (app.activeDocument.name.lastIndexOf(".")!=0 ) { var Name = app.activeDocument.name.substring(0, app.activeDocument.name.lastIndexOf(".")); }
       else {var Name =  app.activeDocument.name;}
       var saveFile = outputFolder + "/" + Name ;
       SaveAsJPEG(saveFile, 10);
       activeDocument.close(SaveOptions.DONOTSAVECHANGES);     // Close the just save
       }
    }
  else { alert("Odd Number of Files");}
  
  //clean up
  app.displayDialogs = orig_display_dialogs; // Reset display dialogs
  app.preferences.rulerUnits = savedRuler;
  ////////////////////////////////////////////////////////////////////////////////////////////////////////
  
  function SaveAsJPEG(saveFile, jpegQuality){
    var doc = activeDocument;
    if (doc.bitsPerChannel != BitsPerChannelType.EIGHT) doc.bitsPerChannel = BitsPerChannelType.EIGHT;
    jpgSaveOptions = new JPEGSaveOptions();
    jpgSaveOptions.embedColorProfile = true;
    jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
    jpgSaveOptions.matte = MatteType.NONE;
    jpgSaveOptions.quality = jpegQuality;
    activeDocument.saveAs(File(saveFile+".jpg"), jpgSaveOptions, true,Extension.LOWERCASE);
  }