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

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• reading photoplethysmograph waveform with serial port on PC using Labview

  Hello world

  I'm gaining time real Photoplethysmography waveform of serial port using Labview.I have managed to acquire data from serial port by using the following features:

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  After the reading string will be converted to byte array to be able to extract the bytes associated with waveform (1 & 2 bytes in a frame) even for SOP2 (6 & 7)

  (what is read in serial port is in decimal and must be converted to hexadecimal based on what made the software of prodeuct for some result.that in the waveform properties, I chose the hexadecimal representation)

  Then, as mentioned in the manual, I associate these two values to draw the waveform.

  Although I used the filter band digital waveform of pulse but not significant pass that was seen (cutofffrequeny:10 high low cut-off frequency: 0.5).

  I have attached my program and result in front of Panel and manual for the sensor. The result is still far from what is supposed to be. I was wondering if you could help me and let me know your opinion on the program and the protocol used. I have to get the result as soon as possible. Please let me know if you need more information.

  Kind regards

  
  

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  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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  Jeremy

  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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  I'm currently reading from operating records a PLC with MODBUS/TCP. I confirmed that the PLC will update the values and in response to a MODBUS communication correctly by using a third-party program called Modbus Poll. However, when I try to query the PLC using the LabVIEW shared variable engine, I am unable to read the values of the same addresses that I consult with Modbus Poll.

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  Any help on this would be appreciated.

  So, I thought about it. It turns out that the IP address of the server i/o MODBUS must be set to the address of the MODBUS slave, not the local computer. The address of the i/o MODBUS server is defined by the navigation in the Explorer window projects, expanding the variable engine shared library for MODBUS and right click on the server MODBUS (for example Modbus1) item and select Properties.

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• Possible to use labview with daq system not of NOR?

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  Thank you.

  Hi VIassaks,

  Good afternoon and I hope that your well today.

  Thanks for the post.

  LabVIEW can communicate with 3rd party hardware using the library function call is located in the tip under the functions Palette palette. If your equipment is equipped with a DLL at the driver level LabVIEW can communicate with the hardware. However, you must obtain documentation of the DLL so that you can create your own interface for the material of the part 3.

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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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• Strange behavior when using Labview to collect data from Tektronix oscilloscope tds8200

  I hit a wall in trying to understand this one. The problem I have is that my application will not start the oscilloscope when it should.

  I use an oscilloscope Tektronix TDS8200. My goal is to collect data from the oscilloscope using Labview waveform. First of all, my program initializes and configures the oscilloscope; This part of the program works very well.

  The second part of the program begins the acquisition of data with the function 'Tktds8k Start or Stop Aquisitions.vi', which is to press the button run on the scope. The function "tktds8k to Waveform.vi" is used and should ideally return data, which I connected to a waveform playback graph.

  When I run my program, the first part runs without a problem, but as soon as the program comes to the service get the waveform, the run button in the scope, which is green when running, turns off; the program then expires, and no data is collected.

  Here is where it gets weird. I went through the debugging to try to understand this point, and I put breakpoints on the beginning and get shape wave functions so that I could scroll through the last part of the program. The program continues with the departure function, and the button run in scope is green. The breakpoint for the function get the waveform is reached and when I press on continue, turns the Run button and turns it off then back on almost immediately. data are collected, the waveform graph appears and the program ends without error.

  I thought that the timetable could be the problem, so I did the program wait as long as five seconds between the functions of start and get the waveform and that did not work. I also tried to move the start function to before the configuration functions and remove start completely; no method worked.

  is there any ideas on why, the program works when I enabled breakpoints and isn't when breakpoints are disabled? I'm sure there is an easy solution, but I was not able to find a solution.

  I have attached a pdf that contains information about the functions of the Oscilloscope (tktds8k.pdf), and I have also attached my program.

  
  

• with an average of 5 minutes of data - is no way

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  Does anyone have a suggestion?  I would really appreciate any advice or suggestions on how to go about it.

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• Power SVFA - with an average of question spectrum

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  Any thoughts?

  Oleks:

  The sounds and vibrations help file for the Modes of time on average, we see that this is expected behavior:

  "In an average of peak-hold, the largest value of sound pressure level measured in all the previous values is calculated and returned until a new value is greater than the current maximum. The new value becomes the new maximum value and the returned value until a new value is greater than it. Peak hold is not really a form of averaging because successive measurements are not mathematically average. However, as with other processes of establishing an average, average peak-hold combines the results of several measurements in a final measure. As for the average exponential, the process of averaging continues indefinitely. »

  So because Peak Hold do not average in the strict sense, it does not restart on average the number of averages you specified as RMS and the vector average which are a true average.

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