Display two signals on a graphic band

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• How do I display two signals graphic multiplot

  Hi, I am currently working on a LabVIEW program that requires me to display two signals measured by two current using MyRIO sensors OR. I am facing problems displaying two signals on dashboard of data, I know how and what should I log in the block diagram Front Panel of LabVIEW so that both signals, measured by the current sensors can be displayed on the dashboard of data?

  -Introduction to LabVIEW: http://www.ni.com/getting-started/labview-basics/ and http://www.learnni.com/
  -Check the labview\examples\general\graphs\charts.llb for examples of the waveform card: https://zone.ni.com/reference/en-XX/help/371361J-01/lvconcepts/types_of_graphs_and_charts/
  -Examples: http://digital.ni.com/public.nsf/allkb/21E8163F259DA2058625703B007511AA , https://decibel.ni.com/content/docs/DOC-40940 , and https://decibel.ni.com/content/docs/DOC-5574

• Displaying several curves on a graphical 2d in reports how can I force a curve to be at the forefront?

  Displaying several curves on a graphical 2d in reports how can I force a curve to be at the forefront? I have two signals, and I want to show a bunk on top of the other. This time Diadem will be only graphic it the other way around. I tried to delete the curves and add them in different orders, change the order that they are in the list of the curve, changing their order in the data, right-click on the curve portal and selecting "move to forground" (this only moves the complete 2D graphic object in the foreground). IM using the Diadem 12.0 base.

  Hello Joe,

  I found what causes your curves draw in the wrong "order".

  You are using two value axes and DIAdem still attracts before Y2 Y1 data, regardless of the order of the curves in the "Curve and definition of the axis" dialog box.

  I enclose your layout with a little modification, I changed the order Y1 and Y2 axis (I swapped whose data is displayed on the value axis) and I get the following result:

  

  Once I looked at your page layout, it appeared, why the order of curves does not reflect the order in which curves were drawn. I didn't - so I just learn something new here as well.

  I hope that this answer to your question, do not hesitate to ask if there is anything else I can help you.

  Otmar

• How to display the signal on a waveform graph in Labview Signal Express?

  Hello

  I want to display a signal in Signal Express 3.0 in a "waveform table", but don't know how to do it and I think that it may be impossible?

  In Labview, there are two ways to view data, a 'waveform table' or a 'waveform graph. The great thing with 'picture of waveform' is that it allows you to set a length of history and you can see the data move to the left (option graphic strip) that samples are recovered. It works perfectly.

  In Signal Express I can only select "Graph XY" or "Waveform curve" by doing a right-click of the mouse, but I can't select "table of waveform. Is it really true that it is not possible to view data in a graph of waveform "with Labview? (1 analog signal during streaming, 100 samples to read at the rate of 1 K)

  Thank you in advance,

  Enrique

  Hi Enrique.

  You are right that there is currently no graphic waveform in SignalExpress. The thing nearest you can join, is saved data under a log and then he looks one when recording (which I know this isn't quite the same interactive behavior).

  For your last comment, you wrote 'waveform curve', but I guess you meant 'picture' here as well.

  Sorry about that. We recently received this request, then perhaps in a future version.

  Phil

• HP monitor does not display "DVi signal.

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  Disco96, welcome to the forum.

  The specifications for the computer show that they run win 8 64-bit.  Downgrade you for Win 7?

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• Two signals to two graphs of waveform

  Hi all!

  I had some problems with my data acquisition software.

  I got two signals and I show two signals to two different graphic signals.

  How to separate the signals?

  There is an entry called "table". Just this thread in the 2D DBL table. Drag the bottom of the table Index down so that you have a second output sub-table. Wire of your graphics. Fact. No need to plug anything on the index entries.

• Time scale does not properly after separation of the two signals of virtual channel

  Hi all

  I have a problem when I use a virtual channel with two analog inputs. I'm cutting the two signals into two separate tables of waveform, as shown in the attachment. The two signals seem to be reading very well, the problem is that the time scale (x-axis) begins to act on the strange. Seconds displayed time seems to keep jumping up and down at a high frequency, resulting in the two signals of displayed does not correctly in the table of waveform. Could someone please try to help me? Any help would be greatly appreciated!

  Thanks in advance.

  Try to acquire a signal with first time information. You can replace the DBL 2D with a data type of 1 d wave. You don't need this code extra silly - just a function of Board Index to get the separate channels.

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  I deleted and re-uploaded the book, but the behavior is the same.  I signed up in iBooks on iPad an another running ios 9.3.5 and display two pages work properly, with normal font sizes - sizes that won't let me see the same book in two page mode on iOS 10.

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  I also noticed. Any solution?

• Firefox displays two barely legible as a default fonts fonts. These came from an email that I opened. How can I get rid of them?

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• 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

• Add two signals different dt

  Hi, I try to achieve the function Sum (+) and Sub (-) with the participation of waveforms, I know the problem and the different dt when dt is the same the smooth executing operations but I want to achieve something like this Waveform sum Figure 1 as you can see if two signals with different frequencies are added between them the result looks like Figure 1 , but with the same dt different frequency is not calculated and the amount always show that the two signals have the same frequency. How can I realize the amount similar to that in Figure 1? Thank you all

  Hello Silversky,

  It seems you want to do something like that...

  But the figure referenced never mentions the signals with different dt! Simply to create waveforms with same dt in the first place...

• Display two tables 1 d on Wavechart

  Hello

  How to display two tables 1 d of the same size on a WaveChart

  Thank you.

  No, aid is correct, if wire you a table 2D to waveform curve, you can transpose it in the context menu as follows:

  

  Checking / unchecking this option has the same effect than to put a 2D conversion table before you wire your table in the waveform table.

• How can I synchronize two signals in Labview?

  The first signal is a pulse index which gives the position of a reference point of the wheel (= 1 for 0 ° and signal = 0 for 1-360 °), and the second signal gives the total force meeting the wheel. The two signals have different sampling rates high. The first signal is always 360/rotation, but the second signal varies from cycle to cycle based on how fast the force is changing. The signals are in the form of two columns of numbers in an excel spreadsheet.

  I would like to do such as Labview at the exit of the angular position of the reference at the time of the cycle where the wheel knows the maximum strength in degrees. Can anyone suggest a vi or a method that I might be able to use for this task? I am new to Labview, so any help is appreciated.

  Hi Westerman,

  I have a little trouble to understand the basics of what you're trying to do. A little more details would be very helpful pointing you in the right direction. If you want to align the timestamps/reference of the two signals time?

  I've included a link to a document that describes generally how encoders (I guess that your pulse index indicates that you are using an incremental encoder) can be used in LabVIEW.

  http://www.NI.com/white-paper/7109/en

  You should also try the search the forums for questions relating to the use of a rotary encoder in LabVIEW. I was able to find several with the included code example.

  Feel free to provide us with a few details and we'll help guide you.

  Andy C.

  Technical sales engineer

  National Instruments

• 200560 error during the generation of the two signals of AO

  Hello

  I am trying to send out two signals and I get error 200560 to "wait until done" vi.

  I was wondering if there is no solution for this problem.

  BTW, the vi is attached.

  Thank you

  Pooya

  You have your clock set to continuous samples. I don't know if you can use 'Wait until what' If you the task will never happen. Set your click on over and see what happens.