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

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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

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

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 .

Can my 600MHz P-3, 256MB Ram handle a data acquisition of more than 1kHz with waveform chart support?

please suggest tools for acquiring high speed 8 analog channel data.
can my 600MHz P-3, 256MB Ram handle a data acquisition of more than 1kHz with waveform chart support?

Arun,
I have performed data acquisition on a computer with lower specs than the one you described, at rates greater than 1 kHz. I don't quite understand the "waveform chart support" portion of your question, but if you are asking if it is possible to plot the acquired data on a Waveform Chart in LabVIEW, this should not be a problem.
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-D
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Regarding Pages charts, when I try to 'build' a 3D chart all I get is little dots but not graphics. No problems with 2D charts though. Guess my question is "Help?"

Sorry for the delay getting back to this.
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<?xml version="1.0"?>
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Any ideas coding friends?

"nikos101" <[email protected]> wrote in
message
news:gib6aa$prr$[email protected]..
>I have a problem with a chart refreshing after its bound
data provider
>changes.
> After the subsetHighLowData.refresh() is called I would
expect the chart
> to
> redraw, but it still looks the same. I even inspected
the debugger to see
> if
> the slice had taken place and it had.
>
> Any ideas coding friends?
>
> subsetHighLowData.source =
>
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HTH;
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Seems to simply be a problem with your data. See this
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