Problems with Waveform Graph

When I add a Waveform Graph into the Front Panel, the Block Diagram Window shows it as DBL instead of the usual indicator for the Graph. How can I solve this problem?
Attachments:
Question.vi ‏9 KB

I don't see what the problem is. The default waveform graph type is an array of doubles and that's what your diagram has. If you create a waveform data type and wire it to the indicator, it will change the graph's icon.

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Using General Polynomial Fit VI with waveform graph

Hello gurus ,
I would like to ask how to use General Polynomial Fit VI with waveform graph not GraphXY .
Waveform graph is giving me an array of values not X , Y i think , what should i do ?
Thanks in advance
Solved!
Go to Solution.

Hi Omar,
i changed the shipped Labview Example to use the General Polynomial Fit VI with a waveform graph.
But why don't you want to use a X-Y-Graph?
Regards
DianaS
Attachments:
test.vi ‏37 KB

Problems graphing FFT of sine wave with Waveform Graph

I know that this type of question has been posted
many times, so I apologize for posting a similar one. Unfortunately,
after reading quite a few threads I still have a question or two.
Basically, I need to use a Waveform Graph (not an XY graph) to graph
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should be using to obtain the magnitude of the FFT. I think I'm using
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Attachments:
Labview5.vi ‏199 KB

Your problem is that the output of the FFT is an array of complex numbers. Take the magnitude and you will be able to plot it.

Problem with Waveform Chart updating

Hi!
I have written a LabVIEW project for 8510.
I have a problem with the waveform chart not updating the data incoming to it.
that is, Y axis does not update according to 8510 display format.
May you help me?
Attachments:
Network_Analyzer_8510C_nazanin_5.lvproj ‏6 KB

Hi,
Do you want to change the label???
1. Just right clicl your graph
2. in the properties window go to 'Scales' tab
3. select the Axis, and change the name.
Is this the solution regarding your issue....
Or
do you want to change the domain from Time or Frequency...??
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.
Attachments:
Solution.vi ‏265 KB

How to connect with waveform graph?

hi
i would like to know how to simulate wave form graph the input is randon number ?My problem is i cannot connect with wave form graph...
can u show me example..like using arrary...or something else..i looking forward ur reply
thank u

I have an example that you may want to look at here.
The example was for a signal generator, but there is a waveform graph to show the selected waveform. It is an extremely basic program, but might be a good start.
RayR

Problem with printing graph larger than screen size in labview6 (plots are shopped).

I have attached with my message the report I try to print. It is a Labview 6 vi.
I had no problem with Labview 5. But with Labview 6, the plots are shopped (all the rest of the report is correct). What is printed is not what I see.
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Thanks if you can help.
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Attachments:
Print_of_large_scale_graph.vi ‏284 KB

Hi Lionel,
I experienced a similar problem days ago: re-compiling a vi from LV 5.1 to LV 6.0.2 its front panel could not be printed anymore; no error, just a blank sheet.( The mass compile procedure did not reported any error).
The only way to get out from this headache was to re-build the vi in LV 6.0.2, I simply selected all its diagram and copied it in a new vi, saved it and I got print-outs!
Try it.
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Problems with 3D graph application redistribution

Hello wireworkers,
i wonder if
someone encountered problems with distribution of application that
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Hi Alex,
I tried the process you described on my machine using LabVIEW 7.1 and could not reproduce the behavior. If you can clarify the version you were using that will be helpful. I will have to clean a test machine and try it again without LabVIEW installed, and get back with you if the problem appears. In the meanwhile, I found the following KB which, while not referring to the exact same problem you are describing, does address the evaluation message issue. You can try to follow the steps at the end of the KB, and let me know if that worked.
http://digital.ni.com/public.nsf/websearch/1E1FB3C19E8E0A9986256F8D0077D0E6?OpenDocument
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Problem with waveform chart

Hello friends.
I'm in learning lab view and have some questions.
I get a signal with an Analog to Digital converter (an Atmega 32) and send data to com port .
I convert my data to real value in voltage and time .
But i have problem with show wave form in different frequency .
By Increase of frequency , waveform chart can not draw my data Clearly.
What i do to show data in different frequency ?
Thanks .
Attachments:
t4.vi ‏13 KB

Interfacing with hardware is seldom easy. That is why I lean toward NI stuff since they have made there stuff resonably simple and they have good supprt.
When interfacing with hardware from others, we have to look fo rthe manufacuer of the hardware to provide enough support to get started.
So I suggest you contact whoever makes your device and get some examples from them.
Hopefully they have heard of LV and have drivers.
Otherwise, ther is no guarentee it will be possible.
If English is not your primary language, plese feel free to post in both English and your native language. We have contributors that can handle most languages so do not let English get in the way.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Problem with waveform chart: time scale does not show time correctly

Hello,
I have some problems with a chart.
I want to display some data and the time between two single data can vary. It is something between 50ms and 500 ms.
The problems I have:
1. The time is not shown correctly in the chart (allways 2:00:10 instead of the current time)
2. the data points in the chart have a distance of 1 s (x-scale). That is not correct.
I have tried several things but I thinkt I am on the wrong track.
Could you please help me?
Johannes
LabVIEW 7.1 (!)
Message Edited by johanneshoer on 10-14-2009 04:26 AM
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Solved!
Go to Solution.
Attachments:
Chart Test.vi ‏55 KB

I have modifierd the vi again.
Now it looks much better.
I have a data array and the last 10 seconds of the data are displayed.
The array size is maximum 150 and that is more than I need to display. If new data is inserted, the oldest gets deleted.
I wonder if this style is efficient?
The time is stil not displayed correctly in the graph. Why does it always show 2:00:00 ?
Johanens
LabVIEW 7.1
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Attachments:
Chart Test 3.vi ‏57 KB

I'am having problem with a graph property node by using format & precision

I would like to display an amount of data in a waveform graph and to choose the X scale to display absolute time (whitout date information) or scaled decimal value.
Absolute time is a must because the scaling should reflect the acquisition time and not only a value in hour, minute and second.
Using the property node I can choose between 10 differents formats (0-Decimal, 1-Scientific, 2-Engineering, 3-Binary, 4-Octal, 5-Hexadecimal, 6-Relative Time, 7-Time and Date, 8-SI, and 9-Custom).
Format 7 - Time and Date should be a good choice but LabVIEW set automatically system time AND system date without any possibilities to change anything.
Trying format 9 - Custom ends everytime with error 1077 (invalid property value).
Any help to explain me how to use the format Custom or to give me a solution to switch between time (no date) and decimal scaling is appreciate.
Thank

In addition to the Xscale.Format property node, you also need to set the XScale.FormatString (see a little below the Format entry).
Use %<%.0X>T as format string.
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Problem with xy-graph program

HI!
I have a problem with my program. With this program i want to load a datafile and to display the data from the file on the xy-graph. i want to display 1,2,3 or 4 graphs on the xy-graph. The problem is, when i want to display only two graphs and i push the "... laden" button, a popup will open and ask me for the 3rd ord 4th graph, but i want only display two graphs.
The program should display the data, when there is a path added in the path-element (the white,red,blue or grenn one).
The second problem is, when i start the program and push the "...laden" button and no path added, a popup will open and aks me for files, but the popup should not open!
Could somebody help me???
TNKS
best regards,
peter
Labview 7.1 on Windows 2000
Attachments:
program.zip ‏30 KB

Hi,
The function you're using to open the file is automatically asking for a file name when you call it with an empty path connected to the file path input.
So, if you don't want to get the data when the path is empty, you should not call that function.
I've changed your vi to show you.
Hope it helps,
Paulo
Attachments:
Vergleich_XY.vi ‏93 KB

User interaction with Waveform Graph

My application uses a Waveform Graph to plot data acquired from a
scope. The application does some analysis of the waveform data
and then uses features within the waveform as the basis for
controlling some external devices. The features (peaks) that
are to be used must be selected by a human operator. Ideally,
this would be done by having the user click on/near the peaks
of interest.
I haven't seen anything in Labview that looks like I can trap
mouse clicks within a screen widget. Have I missed that level
of functionality, or is there no feasible way of implementing
such an interface?
I am presently using a system of tables and sliders to allow
the users to select peaks, but the users are not totally happy
with the method.
I
am using Labview 5.1 on Sun Solaris.
Thanks.
--- Rod

One approach would be to enable graph cursors and have the user click and
drag the cursor to the peak of interest. Cursors can also be set to lock to
the graph data You could also add another graph trace which only contains
peak points and then the cursor will only land on a actual peak point.
Mike Sachs
Intelligent Systems
"Rod B. Nussbaumer" wrote in message
news:afal8d$37q$[email protected]..
> My application uses a Waveform Graph to plot data acquired from a
> scope. The application does some analysis of the waveform data
> and then uses features within the waveform as the basis for
> controlling some external devices. The features (peaks) that
> are to be used must be selected by a human operator. Ideally,
> this would be d
one by having the user click on/near the peaks
> of interest.
>
> I haven't seen anything in Labview that looks like I can trap
> mouse clicks within a screen widget. Have I missed that level
> of functionality, or is there no feasible way of implementing
> such an interface?
>
> I am presently using a system of tables and sliders to allow
> the users to select peaks, but the users are not totally happy
> with the method.
>
> I am using Labview 5.1 on Sun Solaris.
>
> Thanks.
>
> --- Rod
>
>

Problems with XY Graph "forgetting" plot properties

I am having trouble with an XT Graph in my loop.
The graph has 10 plots which at any time can have anything from 0 to ~1000 points, often some plots will have significantly less ploints than others. There is a user selectable option to display all points or just the most recent set.
My problem is that I want the graph to reflect the input data by plotting a single point at the time of an update, so I have a string of points rather than a line.
When I right click the graph and go into properties, I change the point style to solid circle and turn off line interpolation. I then click save these values as default, and save the vi.
However, once I run the vi, the graph always reverts plots 1 to 9 (not plot 0, this stays as I want it) to have no points displayed and line interpolation on.
Has anyone had this problem before? Ho did you fix it?
I know it can be fixed, as I had this probelm a few months ago on a similar vi and after weeks of struggle I solved it, however I just cannot remember how I did it.
Thank you for any help, at the moment I can't post any code. Note that the data the graph shows is all perfectly fine, just the plot properties are being forgotten.
Solved!
Go to Solution.

HI DarraghCorrigan,
In relation to the problem expressed in your initial post:
"once I run the vi, the graph always reverts plots 1 to 9 (not plot 0, this stays as I want it) to have no points displayed and line interpolation on"
This is due to a bug in the LabVIEW software whereby any changes that are made to the plot properties (e.g. to change the colour of a plot) will not be retained, except in plot 0 which is unaffected. Our R&D department are currently investigating this problem so that it can be fixed in future version of the software. The recommended workaround for this problem is to pragmatically set the plot settings at the beginning of the code using property nodes.
As I understand it, this is not the main problem that you are experiencing. If you set up the properties for a plot (using some of the described property nodes) which is subsequently removed or rewritten on an XY Graph, my understanding is that there is no way that LabVIEW can remember and retain these properties.
As you rightly suggested, one way of conveniently overcoming this problem would be to set default plot properties so that when you remove/rewrite a plot and then add it again, it will always default to those properties. Unfortunately, it is not currently possible to do this though it has been recommended as a product suggestion so it is a feature that is under consideration for implementation in future releases of LabVIEW.
I think the issue you need to be addressing is the fact that you are at some point resetting the graph by sending an empty array to it such that all of your properties are lost. If you can find and remove this section in your code, you should be able to overcome your problem.
I hope this helps.
Best Regards,
Christian Hartshorne
NIUK

Problems with waveform chart

Hi guys,
here I am again with another issue... I just need your help to a small issue, the attached VI is my project...the problem i have is that my waveform chart only shows 0.065 seconds of data, i needed it to show the total time of the test...if possible, coordinated with the time selected by the user in "time to test"...
Is it possible?
Can anyone please help me?
Best regards,
Jimmy
Attachments:
Ensaio de Rugosidade_01.vi ‏221 KB

Hi,
Right click your chart and select properties. In properties set the X axis scale minimum and maximum values as per your requirements. Select autoscale if you want it to be automatic. To set the X axis scale programmatically, select the property node X-axis->Range and wire the limits accordingly (in your case, you can wire it to the "time to test".
Regards,
Nitz
(Give Kudos to Good Answers, Mark it as a Solution if your problem is Solved)

Problem with Waveform Chart X scale

Hi guys.
I am new here and Labview, sorry for my english wrongs. I am from Brazil.
So, i try have an absolute time in x scale, from my waveform chart, but the VI don't execute this. I wish make like the picture in annex. It´s the only problem in my project.
I Use Labview 8.6 version.
Please help me
Icaro Kossmann
LabVIEW 8.6 Newbie.
Brazil
Attachments:
tela labview.png ‏46 KB

Kossmann wrote:
This is a print of block diagram with a close in waveform chart.
Your chart does not get any timing information, thus you need to set the dt manually or with a property node according to the update rate of your code (we cannot tell from the picture).
If you want absolute time, you also need to set the t0 according to the start time of the chart. Then you also need to select the desired time format of the axis.
(It really does not help to show us code pictures. I recommend you attach the actual VI.)
Kossmann wrote:
The datatype is 14 channel with single precision, and the format of the x-axis is absolute time, but, the VI don´t show it. And i wish to show divisions on each 5 min.
Instead of telling us what it does not show, tell us what is shows instead and what's wrong with it.
LabVIEW Champion . Do more with less code and in less time .

Problems with Waveform Graph

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