with an average of 100 consecutive measurements below a threshold value

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• two consecutive measures of distance

  Hello everyone,
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  This is two method for your application with holding the CTRL and draw two line King

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• With an average of a spectral waveform and view / save

  Hello world!

  I am currently on a University project that consists on the use of Labview to obtain data and spectra of atmospheric plasmas using a spectrometer Ocean Optics HR4000.

  After not not using Labview for almost a year, I managed to get most of my knowledge back and I managed to display the spectral waveform, that I expect to get. However, as this is a fairly simple design I get a lot of noise and I would on average it for a graphic display more smooth.

  I looked into a lot of messages from the forum, but I couldn't really find what I was looking for.

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  I wrote an example for you below. This is an excerpt from VI, so you can drag the .png in your diagram and it becomes code. Pretend that everything in the green box is your Subvi spectrum acquisition.

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• Covered wagon with an average of analog voltages DAQmx

  I searched through screws, I can't seem to find something that will automatically average numbers of boxcar fed into it. I am trying to create a feature of my software that will allow the dynamic configuration of the car covered with an average of some inputs. I would like to avoid hard-coding tables which are filled/rotation etc etc.. Any help is appreciated

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• with an average

  Hello everyone,

  I have a question about signal average in labview. Please help me.

  I have two entries of signals to my LabView code, one comes from a function generator (in saw teeth with a frequency of 10 Hz and amplitude of the 0.4V) and the other by a detector. For each voltage coming from the unit, there is a response of the detector so that I can have a graphic on my code that the vertical axis is the response of the detector and horizontal axes is the voltage of the generator (the graph is original linear signal from).

  The frequency of the generator is of 10 Hz and I have 10 signals per second (as time passes, a lot of signals can be seen on the other). Now, how can I know LabView that update the chart every 5 seconds, what was on average 50 signals? In fact, I need to see only the final signal that is an average of 50 raw signals.

  Your help will be really appreciated

  Thank you

  Soran

  Hi Soran,

  I think the problem is that when the time is up, you stop the program and draw the thing on the XY graph. Problem is that when you stop code, the graphic delete (of course there that shift registers not initialized that contains the value of your past last run results). The easiest way is to use queues via the architecture of producers consumers (http://www.ni.com/white-paper/3023/en/).

  From the diagram below, you can see that I have 2 while loops. One is the producer where I store the values of the DAQ assistant in a queue while the lower loop is my consumer which I extracted the data stored in the queue. So for every 100 ms time will send the True value to the business structure that stores the value of the queue (you will need to play with the settings of the DAQ Assistant). If this is not the case, the producer while the loop runs the false cases indicated in the second screenshot. The consumer while loop, there is a queue Status.vi get that checks the State of the queues. As soon as there are 10 items in the queue, I find their (real case turns structure) which gives you an array of 10 elements. I have summarized the table of 10 elements and divide them by their size of table (10) and he draw a waveform graph. Otherwise, the consumer while loop runs the wrong case (meaning no evidence is found and allow the data to be buffered).

  

  

  Just take screenshots above regarding your own reference. I'll leave the rest to you on how you want to adapt this concept in your code.

  Hope that helps

  Warm greetings,

  Lennard.C

• with an average of streaming data

  I take analog measurements on a module SCXI 1102C through a PXI for LV2009. I'm running the DaqMx Read 1 d Waveform to 100 samples per second in a while loop that runs every 45-50 MS, it means that I get about 5 data points per while the loop iteration. Even if the program is windows-based, it has a good amount of determinism built in. I now have to make a decision based on an average of 15 samples, preferably 25-50.

  I can't slow down the while loop down because there are other channels in data that must trigger some things at the fastest rate possible in windows. I can live with the latency of 50 to 100 ms for the latter, but not the 500 ms I would get if I slowed the loop down to this new task.

  Are the only two options that I came to use five registers with shift on the while loop, but I really don't like this idea. Or open the TDMS file while I write these data and read the seconde.25 block that I need a way to make a decision. Also seems to be a bad idea.

  A third option, in my opinion, would be to place a Subvi who writes this string to five different functional space and constantly updates their creation of a buffer running. It seems not a bad idea, I just don't know how to implement it yet.

  Any option obviously better that I'm missing?

  There are two different methods that can be used. If the loop of writing runs more slowly that the loop of the acquisition, then the functional global is to keep a number of samples in it anyway. This allows more data work on when an average.

  The other is to use a moving average. I have attached a VI that does this. It's a global functional on its own.

  Rob

• waveform, with an average of results using labview to O-scope

  Hello fellow engineers! I'm a first-yeargraduatestudent in CHEE at the University of Houston. Basically, I know nothing about labview. I am trying to program an application that looks like this - I collect a waveform of the signal of O-scope. This waveform does not change its characteristic shape. I need to find the wave form average of waveforms of N (100 for example). Thus, the slight changes (or noise) in the feature of form during the period mustbeaveraged out and I need to have a resultant waveform that represents the average waveform over a period. So, basically, I'm collecting the wave several times (for example 100) on a single period. The O-scope that I use now is Tektronix TDS 2024 B. It communicates with the computer via USB. The version of labview is 8.5. For now, I am able to communicate with the computer using our o-scope through labview. I already downloaded the driver of instruments of your Web site. It turns out that the program can give me only the average result I can get directly from o-scope manually. I need to have more say on average (100) using labview. I wrote a program that relies on the instrument driver that is downloaded on your website (for loop part is average, the waveform). The program that I modified and an instrument driver are attached. The program cannot be fully open, if the driver is not put in the right place in the labview (under lib inst.) When I run the program, the average waveform does not appear on the front panal and signal waveform file is not saved correctly. Is there someone can find where I did wrong and it develop for me? Because I barely know Labview, it will be even better if you can add an image or program that you have changed. I'm waiting for your creative ideas.
   
  With the best regards,.
  --
  Weiye

  
  

• With an average of 10 channels of waveform separately

  I've written a VI that takes input from 10 different devices then shows in several graphics and then saves in PDM. This works perfectly well. The problem is, on my PDM data, is saving 25 samples per second creating a file of long worksheet for short durations. Im trying to figure out how to reach an average of each channel independently (average 25 samples) and print it out every second, so there should be a 1:1 ratio between my timestamps and data, not 01:25 how it is now. Thank you!

  

  Personally, I just averaged 100 samples you take.  If this simple solution is to replace your table decimate (inside the square structure) with a Mean.vi.  You will need to use a range of build with a single input to transform a table to write in the waveform (still inside in Place element Structure) of the average.

• Table 1 d with rejection of the two consecutive points

  Hello

  I have table 1 d with 10 measuring points. I treat points in pairs and according to the difference between two consecutive points, I have decision weather the two points must remain in the table or should be rejected. For example, my 1 d table looks like this: 10, 20, 30, 35, 40, 44, 50, 51, 60, 69. I calculate the difference between consecutive points by pairs: 20-10 = 10, 35-30 = 5, 44-40 = 4, 51-50 = 1, 69-60 = 9. I would like to reject the table points with the value of the gap less than 2. In my case, the points are 50, 51 and the table after the rejection should have 8 items and look like this: 10, 20, 30, 35, 40, 44, 60, 69. What is the most elegant way to do it? I'm in LabVIEW 8.6.

  Thanks in advance!

  Review your original message and your example to better understand your stated requirements.

  "I treat the couple points."

  You have to take into account only the pair of 1st and 2nd point, then don't take into account the point of 3rd and 4th pair so on and so forth.

  Never consider the 2nd to 3rd or her never consider the 4th to the 5th, so on and so forth?

  What is your table? If it is very large (1000000 points), you may need to consider other options for the use of memory and speed.